Author Topic: Sought: AGN with big companion galaxies  (Read 104367 times)

egalaxy

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Re: Sought: AGN with big companion galaxies
« Reply #15 on: January 16, 2012, 11:51:08 pm »


looks like it...

ra   179.73677
dec   -0.07084
type   GALAXY
u   20.49
g   19.35
r   19.00
i   18.72
z   18.65

id: 1237648721230626977
« Last Edit: January 17, 2012, 12:15:10 am by egalaxy »

mitch

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Re: Sought: AGN with big companion galaxies
« Reply #16 on: January 17, 2012, 12:21:57 am »

http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237662620798419053
MRK 494, UGC 10128 - posted by Elizabeth - although not a spiral, but both at z=0.032

mitch

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Re: Sought: AGN with big companion galaxies
« Reply #17 on: January 17, 2012, 12:35:03 am »

http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587727866186629170

2 AGNs though  :P

[VV2003c] J083540.5+462939 -- Seyfert 1 Galaxy
Mrk 92
both at z = 0.014
« Last Edit: January 17, 2012, 12:51:18 am by mitch »

mitch

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Re: Sought: AGN with big companion galaxies
« Reply #18 on: January 17, 2012, 12:55:44 am »


mitch

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Re: Sought: AGN with big companion galaxies
« Reply #20 on: January 17, 2012, 02:38:15 am »

NGC3314

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Re: Sought: AGN with big companion galaxies
« Reply #21 on: January 17, 2012, 04:59:49 am »
Once again Zooites have jumped in faster and deeper than I would have imagined. (You would think I would learn one day...). Here's a quick progress report from suggestions so far - which mostly shows what a rare kind of thing we're looking for, and that you've added a couple of candidates to our working list already.

Mkn 463 - this merger rated highly in the Voorwerpje hunt, and is in fact on the Voorwerpje list with spectroscopic conformation. Things this distorted make it hard to know whether the size of the clouds tells us about where the gas has been pulled into tails, or where the radiation has reached. (By the way, this one is not on the Hubble list because its infrared output makes it pretty clear that the nucleus is powerful enough to light up the gas, but is heavily dust-shrouded from our direction).

587734891678072847 has a prominent type 1 Seyfert nucleus, and that cloud may be a Voorwerpje.

588017604146823386 looks promising - that small companion to its SW has a reddened Seyfert nucleus, and the big disturbed galaxy offers plenty of real estate to intercept UV from it.

587742775640391773 could work - there's a bright AGN and suspicious blue clouds along the galaxy disk plus a (small) companion.

588018091082121399 has a weak AGN, and the companion wouldn't intercept much of its radiation being that small.

Some of these are emission-line galaxies, but ionized by hot stars rather than AGN:
587725470667374755
587729228223938569 (companion S of 587729228223938570)
588017625611108484
588011101028483192
588015508752891945
1237662620798419053
587739154430623928 = Mkn 1218
Mkn 92 (I can't find a reported spectrum any different from the SDSS one, in particular for the southwestern one. Rats.)

For 1237648721230626977 there are no SDSS spectra to be sure what we're dealing with.

In 588016841249390716  the reported AGN is too weak; the star formation in the other galaxy would make it really hard to see a small change in gas properties. (This one was sooo promising). The same thing holds for Mkn 435.


So far, we have two workable pairs with the right properties and spectroscopic documentation, one of which looks really good. Now to get the proposal text caught up!

JeanTate

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Re: Sought: AGN with big companion galaxies
« Reply #22 on: January 17, 2012, 05:48:01 am »
Not all these meet all the criteria (that I could tell, quickly) ...


587739132421799956


587725075521536112


587725980150726781


587741532229009675


587735236882792782



c_cld

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Re: Sought: AGN with big companion galaxies
« Reply #23 on: January 17, 2012, 08:03:13 am »
Suggested UGC 01265  1237679541362884791 SDSS J014846.84+201538.8


c_cld

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Re: Sought: AGN with big companion galaxies
« Reply #24 on: January 17, 2012, 08:06:45 am »
 ??? NGC 4922 587739720291057703 SDSS J130124.51+291830.1


c_cld

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Re: Sought: AGN with big companion galaxies
« Reply #25 on: January 17, 2012, 09:30:11 am »
candidate 2MASX J03251221+4042021 1237661055282380989  SDSS J032512.95+404152.7


elizabeth

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Re: Sought: AGN with big companion galaxies
« Reply #26 on: January 17, 2012, 09:58:06 am »
 ;D Out of my depth here ::) so maybe this....in small voice2MASX J01530150-0329229  DR8 :-\

Alice

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Re: Sought: AGN with big companion galaxies
« Reply #27 on: January 17, 2012, 12:17:45 pm »
This is from an old OOTD which egalaxy just replied in . . .



Of course, a galaxy is just a galaxy; any controversy is a human invention.

This galaxy is NGC 7603 (in our very own NGC Catalogue thread), a.k.a. SDSS J231856.65+001437.9, UGC 12493 (not yet in our UGC Catalog thread!), Arp 92 (in our very own The  ARP Peculiar Galaxy Atlas thread), Mrk (Markarian) 530 (not yet in our Another great Markarian, we need a thread for these. thread), 2MASX J23185663+0014376 (not yet in our 2MASX Catalog thread), MCG +00-59-021 (not yet in our MCG Catalog thread), ...

SDSS J231856.65+001437.9 leads us to its SDSS page ;D

Also, from Monday's OOTD . . .


1237661081587351955

. . . and this comment from Karen encouraged me to post it here:
I think I can just make it out on the DSS image: http://ned.ipac.caltech.edu/dss1B2/Bm/UGC_02495:I:103aE:dss1.gif
which means definitely not an artifact.

Interestingly this galaxy is also a radio source - detected by the VLA NVSS survey. Condon et al. 2002 suggest it probably has an active galactic nuclei in the centre. If this "arm" is evidence for a recent merger, this is an early type disk galaxy (and S0) with an AGN possibly triggered by the event. So that's interesting as it meshes well with one of the favourite ways astronomers think star forming is stopped in disk galaxies.

zutopian

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Re: Sought: AGN with big companion galaxies
« Reply #28 on: January 17, 2012, 12:58:58 pm »

http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=588017949891297351
Both have spectrum
Concerning the luminous object there is given in NED:
Classifications            : WR?;HII        Sy2
Note:
Quote
1. 1999A&AS..135..437G
Re:IRAS 12474+4345
IRAS 12474+4345 S. For de Grijp et al. (1992), this object is a H II region; however, the published {lambda}5007/H{beta} line ratio (2.93) is slightly high for the corresponding {lambda}6583/H{alpha} ratio (0.42). Fitting our spectra with a single set of lines gives an unsatisfactory result, while the solution with two sets of lines is acceptable, with
small residuals. One set of lines corresponds to a H II region, while the other has {lambda}5007/H{beta} = 4.43, {lambda}6300/H{alpha} = 0.03 and {lambda}6583/H{alpha} = 0.40; these values are intermediate between those corresponding to H II regions and Seyfert 2 nebulosities.
Moreover, the He II{lambda}4686 line is detected with {lambda}4686/H{beta} = 0.17, if all the He II flux is attributed to the "transition" component. We are unable to conclude concerning the nature of this second component.

c_cld

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Re: Sought: AGN with big companion galaxies
« Reply #29 on: January 17, 2012, 02:46:35 pm »
Mrk 334  1237679476933722181  SDSS J000309.60+215736.8