Author Topic: Suggest a target for spectra!  (Read 15178 times)

NGC3314

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Suggest a target for spectra!
« on: June 17, 2010, 11:52:29 pm »
Our Kitt Peak observing run has four more nights. At this time of year, the best coverage area for the Sloan data is no longer reachable for the last hour or so of darkness, so we may well run out of candidate Voorwerpjes for that part of the night. It's a shame to waste telescope time! Therefore, we are asking for the collective wisdom of Zooites - help us out! Post suggestions here, with the reasons they're interesting, for  things to measure a spectrum of (and do it within the next couple of days).

Things to know:
- we can acquire stars and quasars somewhat fainter than 17th magnitude (say r magnitude), galaxies usually need to be 16th or brighter for us to center them well on the TV (depending on how bright the nucleus is)
- Our setup spans the wavelength range 3300-5700 Angstroms, with resolution of a few A. We get data along a slit 2 arcseconds wide and 5 arcminutes long which can be oriented in any direction we need.
- Targets could be roughly from 17-23 hours RA, north of about declination -15 degrees.

Our plan is to post the reduced data as FITS files for anyone interested to use.

EigenState

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Re: Suggest a target for spectra!
« Reply #1 on: June 18, 2010, 01:18:11 am »
I would suggest Mitch's Mystery Star but the spectral coverage and resolution is not going to reveal any additional information on the 6100A asymmetry.   >:(

If it would be possible to see the 5100-5500A region, part of which has been assigned to MgH, at higher resolution or better sensitivity than is currently available, that might also be worthwhile.  If I recall correctly, Dufour did mention to me that he has a spectrum at higher resolution, but he never followed up on making it available.

Good seeing!
ES

Edit:  MgH does have hfs!   ;)

NGC3314

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Re: Suggest a target for spectra!
« Reply #2 on: June 18, 2010, 04:53:48 am »
Reminder - we have openings in the RA range 17-23 hours (255-345 degrees) and north of declination -15 degress.

Budgieye

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Re: Suggest a target for spectra!
« Reply #3 on: June 18, 2010, 07:31:54 am »
Sorry , the SDSS number should be
J170000 to J230000, is that correct?

and one of the brighter objects,   magnitude of r being greater than 17 for galaxies.
« Last Edit: June 18, 2010, 07:35:20 am by Budgieye »

c_cld

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Re: Suggest a target for spectra!
« Reply #4 on: June 18, 2010, 08:00:04 am »
Our Kitt Peak observing run has four more nights. At this time of year, the best coverage area for the Sloan data is no longer reachable for the last hour or so of darkness, so we may well run out of candidate Voorwerpjes for that part of the night. It's a shame to waste telescope time! Therefore, we are asking for the collective wisdom of Zooites - help us out! Post suggestions here, with the reasons they're interesting, for  things to measure a spectrum of (and do it within the next couple of days).

Things to know:
- we can acquire stars and quasars somewhat fainter than 17th magnitude (say r magnitude), galaxies usually need to be 16th or brighter for us to center them well on the TV (depending on how bright the nucleus is)
- Our setup spans the wavelength range 3300-5700 Angstroms, with resolution of a few A. We get data along a slit 2 arcseconds wide and 5 arcminutes long which can be oriented in any direction we need.
- Targets could be roughly from 17-23 hours RA, north of about declination -15 degrees.

Our plan is to post the reduced data as FITS files for anyone interested to use.

Hi NGC3314,
I'd suggest a QSO target and its absorber for getting the two spectra apart:
SDSS J231055.50-090107.6 -- Quasar
587730817903362292
seems overlapping



Another overlap target in a nearby field
587730817366360250 SDSS J230945.86-092118.6


c_cld
« Last Edit: June 18, 2010, 08:15:31 am by c_cld »

graham d

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Re: Suggest a target for spectra!
« Reply #5 on: June 18, 2010, 08:17:02 am »
In the region Ophiochus Hercules Draco and across towards Cassipeia and Sagittatius I have formerly listed seven white dwarfs as possible binaries. Temporal spectral variations I think are a higher priority than sheer resolution.
Only two candidates are within your specs Bill -
Hot favourite-

17:21:50.6, 30:44:23.50    you will know it when you see it; the glare from an adjacent star may interfere?

17:22:54.07, 30:03:38.6

Apologies for initial bad coords
« Last Edit: June 18, 2010, 08:28:27 am by graham d »

NGC3314

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Re: Suggest a target for spectra!
« Reply #6 on: June 18, 2010, 08:19:57 am »
Sorry , the SDSS number should be
J170000 to J230000, is that correct?

and one of the brighter objects,   magnitude of r being greater than 17 for galaxies.

Right. (I try to discourage use of "greater" or "smaller" for magnitudes and go with "brighter" and "fainter" because the reverse brightness-number connection makes communication confusing enough.)

Rick Nowell

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Re: Suggest a target for spectra!
« Reply #7 on: June 18, 2010, 08:51:41 am »
Posted by c_cld here:
http://www.galaxyzooforum.org/index.php?topic=3638.2520

http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587731514226442382   has no spectra in SDSS,
but is labelled as a 'star'. In NED, it is labelled as a galaxy, but has no redshift or spectra. In SIMBAD,
there is no reference.

A good Pea candidate...

c_cld

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Re: Suggest a target for spectra!
« Reply #8 on: June 18, 2010, 09:37:44 am »
Posted by c_cld here:
http://www.galaxyzooforum.org/index.php?topic=3638.2520

http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587731514226442382   has no spectra in SDSS,
but is labelled as a 'star'. In NED, it is labelled as a galaxy, but has no redshift or spectra. In SIMBAD,
there is no reference.

A good Pea candidate...

Hi Rick,
The spectrum is already there in "All spectra";
 in SDSS SpecObjID = 199226909245046784 for 587731514226442382


c_cld

Budgieye

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Re: Suggest a target for spectra!
« Reply #9 on: June 18, 2010, 09:59:41 am »

and one of the brighter objects,   magnitude of r being greater than 17 for galaxies.

Right. (I try to discourage use of "greater" or "smaller" for magnitudes and go with "brighter" and "fainter" because the reverse brightness-number connection makes communication confusing enough.)

I'll try again.  the number r should be 17 or less for galaxies.

c_cld

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Re: Suggest a target for spectra!
« Reply #10 on: June 18, 2010, 11:47:31 am »
Other suggestions
name,ra,dec
587731174379554681,313.33896322,0.78920547
587731185654432037,331.23110026,-0.58537727
587727220865958313,334.96429274,12.02280441
587726877272899670,335.73380253,-9.77673785
587734303272075392,344.54174273,-1.25451924
588015509800550506,347.02303856,0.57200121

links
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587731185654432037 qso faint
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587726877272899670 TARGET_STAR_BHB ~ QSO
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587731174379554681  * ~G
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587727220865958313 AGN QSO reject
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=588015509800550506 QSO faint neighbor SHOC596
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587734303272075392 2SLAQ J225810.01-011516.3 QSO neighbor 6dFGS gJ225810.0-011516  3.11  Seyfert_1

c_cld



c_cld

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Re: Suggest a target for spectra!
« Reply #11 on: June 18, 2010, 03:29:42 pm »
A few other candidate targets
name,ra,dec
587725588773208200,259.63201433,59.88818436
587729653429633680,260.33537411,26.61622751
587725589309948162,260.34662375,60.20405118
587725491600883722,260.84295996,55.07054003
587730817903362293,347.73066359,-9.01987417

http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587725588773208200 (no spectrum in SDSS)TARGET_QSO_REJECT  [LYA2005] 7967 -- Quasar
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587729653429633680 [VV2006c] J172120.5+263658 -- Active Galaxy Nucleus + overlap G
http://cas.sdss.org/dr6/en/tools/explore/obj.asp?id=587725589309948162 0.355000 (no spectrum in SDSS) PHOT FLSVLA J172123.1+601214 -- Quasar
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587725491600883722 QSO + overlap G
http://cas.sdss.org/dr6/en/tools/explore/obj.asp?id=587730817903362293 QSO + overlap G

c_cld

c_cld

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Re: Suggest a target for spectra!
« Reply #12 on: June 18, 2010, 05:51:59 pm »
An overlap without spectra, in the  targeted Ra window and ugriz:
758883091385615863 SDSS J201525.70+602647.4

u g r i z
17.28 15.85 14.96 14.44 14.04

NGC3314

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Re: Suggest a target for spectra!
« Reply #13 on: June 18, 2010, 06:21:11 pm »
I detect a strategy of plying the judges with overlaps. Interesting...

ElisabethB

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Re: Suggest a target for spectra!
« Reply #14 on: June 18, 2010, 06:39:35 pm »
 ;D ;D ;D