Author Topic: What's a QSO?  (Read 25663 times)


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Re: What's a QSO?
« Reply #30 on: April 11, 2012, 02:02:02 am »
The Zoo is mentioned in this paper by Villarroel.

This demonstrates that Galaxy Zoo provides a relatively good estimate of morphology, especially in comparison with eClass.
The clear advantage of the method is likely a result of the high internal consistency in the Galaxy Zoo morphological types.

Systems were selected from DR7 to study
"The impact of quasars on their galaxy neighbours ..." (and)
"characterize the intermediate-scale environments of quasars at low redshift ..."

However, the results presented herein are much more clear cut. This may give support to quasar formation via two scenarios.
The first involves the collapse of material into huge dark matter halos where smaller satellite galaxies form around the massive quasar simultaneously.
The second is a merger-driven scenario where massive objects get created via hierarchical assembling of smaller parts.

Another Inada etal., 2010, reference came with this/these object(s.)
AHZ50006xu, 587731512075747415 is the QSO and a proximal field companion has no redshift.
In this paper,we have also report the discovery of seven binary
quasars with nearly identical redshifts, as well as eight projected
quasar pairs. These quasar pairs are a useful addition to the
studies of the small-scale correlation function and interaction of
quasars ...
« Last Edit: April 20, 2012, 12:26:42 am by joinpep »


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Re: What's a QSO?
« Reply #31 on: April 17, 2012, 10:33:43 am »
Another QSO was posted, 587727943497023525, aka the companion of AHZ2001q3d.
There are a few others that might be mentioned here which share environmental/spatial similarities.
-0cia and -1q3d are 2 recent posts which demonstrate the how varied these systems can be.

The target in -1q3d reviewed as a potential 'merger' interaction.
This target has another view,  in -1q3e, with a QSO (Sy2.) 
There is a clean spectrum in NED.
What might have been a messy barred
spiral becomes viewed as a local group 'activity.'

-0cia_bw, -1q3d_sop

The target in -0cia is a minor part of the field.
We tend to relegate smaller isolated features as more remote and
spatially distinct. At this time we have only photo-zs to estimate the
positions of various features. They were posited/posted as 'merger'
interactions. Might there be other interpretations - and lensing?

Inset of 2-D field with an XrayS(left.)

Next we have -09bs, or -09br and -194t.
Like -0cia the target in the field of -194t is rather slighted by a larger companion.
And like -1q3d there is a local system (interaction?) to consider.
One inset shows the positions of targets in the local system and
the other inset a DR7 image of -194t.
From this rendering one can feel a deliberate movement - shades of -0u2f?
-09br, -194t

And if that wasn't enough here is the pièce de résistance, an item
that exhibits many of the aforementioned properties and might
not be a QSO. In private communications the item is termed RvB.
Even the pros are somewhat perplexed by it.

Deja vu? This is another assemblage like the previous example.
It was in other posts but fell in here after it's Hubble image was
posted in the GLens thread. AHZ2001rul has a larger
gap with its companion but still shares many similarities.
Note: the term sop for set of pixels will
be changed to der for derivative pixels.
-1rul_der can be viewed here.

-1rul has a curious neighbor -1ruj. Corresponding systems near
-1rxc were not found. Here are the other renditions of -1ruj_curve
and -1ruj_der. The inset is from NED. This system is exhibiting too
many features to name at this time save for one. The first set of
derivative pixels, with the 'red' or early affinities, has a der1_blue
component 'spun' off the red field companion. In the other two
examples this feature is in a compressed layer near der1_green.
-1rul seems to have a 'orbiting' spot of der1_blue.

From the Look-alike thread ... rvb field
« Last Edit: December 08, 2012, 09:37:10 pm by joinpep »


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Re: What's a QSO?
« Reply #32 on: May 01, 2012, 10:37:55 am »
Spooky action at a (/various) distance(s)

AHZ2001r1n was posted in the Oddball thread.
The original post was a closeup of the bottom, right-most
elliptical feature, -1r1o. After a discussion, another larger
.jpg was made with a curve and b&w delimiter.
These additions help contrast the Sy-derived 'colored'
elements from other 'structural' elements. The salient
feature in the images is the der2_1bjd accented chain
of blue blobs. Two Sy2_derived nodes flank the largest
Sy1_derived node in the blue blob. Above that medial
node there is another smaller one in another blue blob.
A third blob is beyond the second blob.
The discussion mentioned two Sy2 nodes causing an
event precipitating a medial node during 3 events.
These blobs could be plasma event remnants.

From NED:
field neighbor IrS(center) and
587727944034091522 (bottom)

Two more similar finds -09iw and -01eg. The latter suffers from a poor quality image.

Another (more active XrayS) 1237676303484911685 from DR8.

AHZ2001s5z - Pearls in a row.

587731187277627401, 8658195252977729718 & 587747116763775080, 587747116763774985 upper right qso blue

588015509808545904 center, top z1.5

« Last Edit: August 22, 2012, 09:17:54 pm by joinpep »


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Re: What's a QSO?
« Reply #33 on: May 06, 2012, 11:45:02 pm »
588015509293957216 qso z1.6 and
588015509293957317 zunk, w/ref
Catalog of Very Isolated Galaxies
This QSO and another recently posted one have a z1.4-1.6 range.
Their remarkably similar spectra may imply a local environmental
similarity as well. This is also an opportunity to compare pixel
matches with non-Hubble images.
This .jpg contains both objects side-by-side with 3 derivative
pixel sets. A duplicate was made to expose hidden overlays.
The top pair have centrally located poster and curve overlays that accentuate where the presumptive spectra emanate. It is
immediately obvious that there is more to be seen around the singular-looking object on the right. The peripheral additions don't look
like lensed objects nor do they appear to be paired/interacting with the z1.6 object.
The other z1.4 object does seem to have a companion. This object (system) has the der3_Sy2 coloring. Both objects have der2 combos
at the tops. Z1.4 has a weak node at the top that reminds us of features in reply 33.

We have a Qingjuan etal., (Beijing) reference
Future observations shall provide us with much
better statistics on the distribution of kpc-scale dAGNs
(and pairs of AGNs on even larger scale) as a function
of luminosity and separation and hence will tighten the
constraints on triggering mechanisms of nuclear activi-
that might shed more light on events in reply 33.

« Last Edit: May 11, 2012, 02:12:08 am by joinpep »


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Re: What's a QSO?
« Reply #34 on: May 14, 2012, 02:09:04 am »
(Continuation of Reply 28.)

Today's APOD has a featured bar system and the piece contains a Jenkins etal., 2011 reference.
Observational conclusions were expounded based upon several different sampling regimes -
XrayS, IrS, UveS and RadioS.

The HST imaging also shows the presence of a nuclear
spiral, which is a candidate mechanism for AGN fueling ...

Morphological classification of galaxies is also vitally important,
as newer IR surveys ... are discovering that more galaxies host
bars than optical data suggest
. Galaxies classed as ‘oval’
should also be considered, since they may be just as effective
as barred galaxies at moving gas from the disks of galaxies to
their nuclear regions...

With that in mind, we have some images and a cautionary note.
First the note. When we look at 'derived' images of edge-on
targets we have to think of the 'clarity' of the resource and
ask whether it has intervening, obscuring material. We should
also take note of how the system rotationally situated. Then we
must ask if we are interpreting a barred, spiral or other type system.
The derivations may actually help when it comes to barred systems
irrespective of their visual ambiguity.

-1chu is and example of a system with a "busy plane" and a spiral or
another spiral feature 'over' the core - the "spiral" quoted above was
from a face-on system. (-1chy - hiz blue dot.)

-1s4a has a few substitutions - to say the least. Here we have an
edge-on system and two profound additions that belie the dynamics
of the system and invite us to ruminate why and how we see these
morphological states. (Compare with -141y and -190g.)
-1s4l has a blue-o in its field.

There will be more written about these images soon.

More from Jenkins,
Additionally, in an X-ray study ... a strong correlation was found
between absorbing column density toward Type-2 Seyfert nuclei
and the presence of a strong bar, i.e. more than 80% of
Compton-thick Seyfert 2s are barred.
« Last Edit: July 30, 2012, 01:02:09 am by joinpep »


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Re: What's a QSO?
« Reply #35 on: May 30, 2012, 05:22:12 pm »
AHZ2000cia (s1.22) from reply#32 is interesting on several levels and, nearby,  AHZ2000cih and
AHZ2000cig are more welcome additions to the local color.
(-5752 z.09 w/spec.)
An 'example' from DR8 for illustration.
Among the available observations we have scaling, z-phot, AGN(not faked) and
relationships to other active environments to consider.
The left side of -cia has the -0cih target filled with Sy2 derivative color.
Reply#27 has another take on the target.
This wrinkle is about the stroking around the red fleck which was not noted before (nor was -0cia.)
The system has a bimodal activity when viewed with both termini. Many of the colors are 'busy' and
overlap obscuring greater detail. Do we see other examples of the system before this stage was reached?
This image also has an inset with the location of an XrayS. There is a RadioS below these targets.

To the right of -0cia is -0cig. It has a magnified view of the poster features that appears to mark an AGN.
Fortunately, the scale is applicable to others. The target is the active core. It is not mentioned in NED yet.
This target system looks like a compact barred system with stubby arms and at the same time a spinoff from
its neighbors. The enlargement can be compared with AHZ20005n6.
-05n6 is a posterchild for zphot variability. It also comes with its own companion RadioS.

AHZ2001rpx a timely entry to mark the "Teacup" image(s) from Hubble.

Another image was posted of this AHZ2001rp(_)-series and that led to
several interesting finds including -1rpx (see below.) There are a few
derivative color markers applied to the image which is mostly selected poster
levels. The prominent 'S'-shape figures into discussions of -1rpx, -1rpa and -0cig.
The latter two also have busy cores but are missing the 'bi-modality' we see in
-1rpx. At first glance it appears like a garden variety spiral - that is also an IrS and
RadioS. Reply 35 has -1chu with another figure-8 at its 'core.'

AHZ2001rpa AGN2 RadioS
AHZ2001rpb candidate ELG
AHZ2001rpf UvES

AHZ2001p8g was invited to this reply to provide another view of a system like -0cia
where the target is elaborated under different conditions. This view of -1p8g has a scattered/disorganized Sy2
region and a compressed zone between the red and blue boundary. This type of system is good to use for standardizing
one's redshift as it applies to closely 'mixed' fields.

One final example of the many variables one has to include with an interpretation of a system's dynamics. (It often seems like
the "galaxy" we view in a target is just a small part of a much larger venue of influences.) This is AHZ2000dgz which combines
possible lensing, an XrayS and spinoffs.
« Last Edit: June 17, 2012, 04:27:14 pm by joinpep »


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Re: What's a QSO?
« Reply #36 on: June 17, 2012, 05:16:54 pm »
Continuation of Reply 33: more 'communal' sightings.

AHZ2001rpt aka -1r02
Oddly enough this mosh pit was found among the AHZ2001rp()-series targets
mentioned in the last reply. -1rps is another target off to the right and it was
referenced as a candidate QSO. It's not obvious which spot was chosen as the
"candidate" but it is a fair guess that it is half way to the upper right corner from
the center of the target.

There is thread where these type of targets are posted. Those targets share
many of the derivative colors that we see here. There also seems to be 'stratification'
ordering of the targets from those that posterize with color to those that have
obvious derived color foci and NED study reference classifications.

Below, there is a collection of these 'clumpy' objects which were all processed with
derivative marking as if they were in the same field. Note that despite the differences
in z-phots and scaling that they are remarkably similar in appearance.

Among the targets like -1rpt we have
-0dgz and
-1doo_der or -1doo_bw.

All targets have z-phot redshift values.

« Last Edit: June 17, 2012, 06:09:50 pm by joinpep »


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Re: What's a QSO?
« Reply #37 on: June 23, 2012, 12:40:06 am »
Location, location

A system with many facets and perhaps a busy neighborhood.
The description of the target might advance an interpretation.

Initally the targets are viewed with posterized levels.
This PS-tool can reveal isophotal features which help
discern the flatness and symmetry of the target. Three
zone-levels were chosen. The lowest level, or highest
pixel 'brightness,' is mainly in the core. The core has
contrasting termini. It appears a somewhat anemic bar.
The next zone-level captured a shadow-like area 'under'
the upper end of the core. The last zone-level is a diffuse
bluish 'spray' of that was kept to underscore the 'flow'
outside the core. 
Marking the presumptive 'AGN' pixels was done with two
passes. The beveled blue nuclear "V" with the red stroke
is a 'limit-down' mark for displaying this match.
After boosting the sensitivity to 35 from 20 and stroking
the area in red, we see strong curvature extending from
the elongated core turning sharply to the left (within a
clockwise g-rotation over the posterized 'shadow') and
punctuated with fragments wrapping around the lower extent
of the core. 

The Sy1 and Sy2 derivative set of pixels were minimal at this target scale. The last pixel set was used to fill
the matching components and provides more clues to what is happening in the peripheral region of the system.
The inset of green is added to show where it was overlayed by other layers. There is a companion in the field
and it appears distant. Another companion in the 'neighborhood' might be influencing what we see.
It is a "Two nuclei BLAGN" QSO. It has a z.36. (Here's hoping the redshift is over-estimated.)

This target was found with AHZ2001pyf. They make fairly good comparative targets. Even without 'nearby' influences
this target raises some ongoing questions about structural dynamics. (also AHZ2001cht)

A search of the ID of the 'neighbor' 587726032772399194 turned up another post with a relevant citation.
"CID-42 is also the only X-ray source in COSMOS having in its X-ray spectra a strong redshifted broad absorption iron
line, and an iron emission line, drawing an inverted P-Cygni profile. The Chandra and XMM-Newton data show that the
absorption line is variable in energy by E=500 eV over 4 years and that the absorber has to be highly ionized, in order
not to leave a signature in the soft X-ray spectrum. That these features, the morphology, the velocity offset and the
inverted P-Cygni profile, occur in the same source is unlikely to be a coincidence. We envisage two possible explanations,
both exceptional, for this system: (1) a gravitational wave recoiling black hole (BH), caught 1-10 Myr after merging, (2) a
Type 1/ Type 2 system in the same galaxy where the Type 1 is recoiling due to slingshot effect produced by a triple
BH system. The first possibility gives us a candidate gravitational waves recoiling BH with both spectroscopic and imaging
signatures. In the second case, the Xray absorption line can be explained as a BAL-like outflow from the foreground
nucleus (a Type 2 AGN) at the rearer one (a Type 1 AGN), which illuminates the otherwise undetectable wind, giving us the
first opportunity to show that fast winds are present in obscured AGN, and possibly universal in AGNs."
"Such redshifted absorption lines are rare.
Most known X-ray absorbers in AGNs are blueshifted (see Cappi 2006 for a review) and 85%
of them are at low redshift (z<0.2). As blueshifted absorbers necessarily imply out-flowing
winds, redshifted absorbers would seem to require high velocity inflows, which must therefore
be situated very close to the central black hole. The few convincing cases of redshifted lines
are all narrow absorption lines detected in Seyfert 1 sources (Mrk 335, Longinotti et al.
2007; PG 1211+143, Reeves et al. 2005; Mrk 509, Dadina et al. 2005), and have suggested
explanation as gas falling with relativistic velocity directly into the BH at a few tens of
gravitational radii."
- A Runaway Black Hole in COSMOS Civano et al., submitted 2010.

AHZ2000iu2 is available for derivative rendering.
This is a curve rendition with an enlarged insert of the core region. It was fortunate to find another interesting target
in the area. Many of the other replies mention possible nearby influences. They also mention (Sy1 and Sy2) systems.
From the Hubble image one might interpret the blue feature to be a local star. There are ambiguous examples of these too.
With the derivative renderings in this case some issues arise with the conclusions offered in various papers.
The tail, or arm, of this target creates a 'tadpole' or 'comma' appearance. It leads authors to conclude the there was a merger.
There are lopsided barred systems that don't require a merger scenario. Perhaps the term "merger" is a shortcut to alleviate
lofty, esoteric cosmology.
The compact nature of the core and the unusual pixel matches underscore an unusually stable system for one that has two AGN.
The Sy2 formation is literally buried in the strong circular flow of the prominent AGN derivative fill. A thwarted QSO?
Like -1pyd, the systems are 'wound' tightly and does this mean they are spindly (barred) and unwinding or winding? There is
unique derivative matching that may clarify what is happening pending further observations.

« Last Edit: July 30, 2012, 12:57:30 am by joinpep »


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Re: What's a QSO?
« Reply #38 on: July 04, 2012, 06:37:14 pm »
Aug 3 article.
Scientists Mystified Over How Giant Black Holes Grow
It is difficult to study the evolution of massive black holes because they take so much time to develop.
However, stellar-mass black holes may help shed light on their larger cousins, since they evolve on humanly
accessible time-scales and because as many as 100 million stellar-mass black holes may be scattered
throughout the Milky Way.

June 20 article with KS.
Most Black Holes Are Cosmic Snackers Instead of Binge Eaters
« Last Edit: August 03, 2012, 10:10:56 am by joinpep »


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Re: What's a QSO?
« Reply #39 on: July 13, 2012, 01:32:26 am »
What's(/else can) a QSO(do)?

It can illuminate small 'ghost' systems.
- "Early Universe's Dark Galaxies May Have Been Revealed for 1st Time"

"We searched for the fluorescent glow of the gas in dark galaxies when they are illuminated by the ultraviolet light from a nearby and very bright quasar. The light from the quasar makes the dark galaxies light up in a process similar to how white clothes are illuminated by ultraviolet lamps in a night club."
- co-author Simon Lilly

Sound familiar?

More ghosts closer to home.
- 'Ghost Galaxies' of Early Universe Seen by Hubble Telescope

The three galaxies observed in Brown's study are irregular objects that coalesced about 100 million years before reionization began. They are only 2,000 light-years wide, smaller than the dwarf galaxies seen today near the Milky Way. They are all between 330,000 and 490,000 light-years from Earth.


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Re: What's a QSO?
« Reply #40 on: March 11, 2013, 11:37:32 am »
This is AHZ2001id1 and a Bluper thread candidate. Often we see
Blupers that have this comet-like appearance (bottom left inset)
in the lower extent of the image. The two inserts are enlarged
curve renderings of the system's terminal structures. The
third inset is the relative position of another object in the field.
The ccw- and ccw+ assignments to the insets refers to the
overall ccw-rotation of the object and rotation of the termini
away(-) or toward(+) the RadioS. 

Today there was a post in another QSO thread about HE 1104-1850.
The (bright blue) target looks like a QSO or a star overlap. NED has not
discerned the composite nature of the image. There are other images in
this thread which were previously discussed as lens-like overlaps.

This target will have to remain an open book until further observations
are made.


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Re: What's a QSO?
« Reply #41 on: March 14, 2013, 10:28:16 am »
50-Year Cosmic Mystery: 10 Quasar Questions for Discoverer Maarten Schmidt

Quasars Still Mystify Scientists 50 Years After Discovery

"We have found thousands of quasars in the past 50 years, but we still don't have good
physical models for how they radiate their prodigious energy," Antonucci writes in the current
issue of the journal Nature, which was published online today (March 13). "Without predictive
the­ories, we have nothing. Our best hope for understanding quasars is that extraterrestrials
might drop in and explain them to us."
« Last Edit: March 16, 2013, 04:12:23 pm by joinpep »


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Re: What's a QSO?
« Reply #43 on: March 21, 2013, 12:19:06 am »
SDSS J0927+2943 is an unusual quasar. It exhibits two sets of optical emission lines with different redshifts. The origin of the two emission line systems is believed to be a gravitational wave recoil event: the ejection of a supermassive black hole from the center of the host galaxy. In this interpretation, one of the emission line systems originates in gas that is bound to the black hole, while the other set is associated with gas that remains in the galaxy.
S. Komossa etal., 2008 (43 citations)
A Recoiling Supermassive Black Hole in the Quasar SDSS J092712.65+294344.0?

Artist's rendition of SDSS J092712.65+294344.0 (note the shape of the spiral.)
The recoiling black hole caught the astrophysicists’ attention by its high speed - 2650 km/s - which was measured via the broad emission lines of gas around the black hole. At this speed, one could travel from New York to Los Angeles in just under two seconds. Because of the tremendous power of the recoil the black hole, which has a mass of several 100 millions solar masses, it was catapulted from the core of its parent galaxy.

An opinion from one citation.
Of the 88 candidates, several were previously reported in the literature. We found a correlation between the peak offset and skewness of the broad Hβ profiles, suggesting a common physical explanation for these profiles. We carried out follow-up spectroscopic observations of 68 objects to search for changes in the peak velocities of the Hβ lines. We measured statistically significant changes in 14 objects, with implied accelerations between –120 and +120 km s–1 yr–1. Interpreting the offset broad emission lines as signatures of supermassive binaries
is subject to many caveats.
Many more follow-up observations over a long temporal baseline are needed to characterize the variability pattern of the broad lines and test that it is consistent with orbital motion. The possibility that some of the objects in this sample are rapidly recoiling BHs remains open.
Michael Eracleous etal., 2012
« Last Edit: March 21, 2013, 02:47:32 pm by joinpep »


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Re: What's a QSO?
« Reply #44 on: January 20, 2014, 02:13:50 am »
Astronomers Capture The First Image Of The Mysterious Web That Connects All Galaxies In The Universe

The research still "provides a terrific insight into the overall structure of our universe," co-author
J. Xavier Prochaska, a professor of astronomy and astrophysics at UC Santa Cruz said in statement,
since the "quasar is illuminating diffuse gas on scales well beyond any we've seen before, giving us
the first picture of extended gas between galaxies."

What they were able to see is a cloud of gas extending two million light years across intergalactic
space — the largest ever found. And it wasn't just a diffuse cloud, there are areas where there is
more gas and areas of darker, emptier space. The gas-filled areas are filament, while the emptier
areas are the gaps between filaments and galaxy clusters.
« Last Edit: January 20, 2014, 02:26:42 am by jopipen »