Author Topic: Thursday 14th July 2011: a binary quasar  (Read 6694 times)

Budgieye

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Re: Thursday 14th July 2011: a binary quasar
« Reply #15 on: July 15, 2011, 05:31:36 am »
Quote
List of (ra,dec) pairs
Always ra comes first, followed by dec. Both ra and dec can be in degrees or hh:mm:ss.s dd:mm:ss.s format. The separator can be any white space or a comma.

from http://skyserver.sdss3.org/dr8/en/tools/chart/list.asp

waveney

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Re: Thursday 14th July 2011: a binary quasar
« Reply #16 on: July 18, 2011, 11:42:58 am »
I now have a hundred pairs of objects ..., many look like binary Quasars  ;D

Further refinments being made to the search (on DR8)
Join the Irregular Classifiers
We all help at the cutting edge of ignorance.

Alice

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Re: Thursday 14th July 2011: a binary quasar
« Reply #17 on: July 18, 2011, 11:50:34 am »
 ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D

c_cld

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Re: Thursday 14th July 2011: a binary quasar
« Reply #18 on: July 29, 2011, 10:02:47 pm »
I now have a hundred pairs of objects ..., many look like binary Quasars  ;D

Further refinments being made to the search (on DR8)

Have you recovered what had been already published, and how many unknown "QSO-QSO PAIRS" did you uncover by spectra (class/subclass) and/or by color photometry?
Thanks
c_cld

One of my previous posts, on December 29, 2010 http://www.galaxyzooforum.org/index.php?topic=6732.msg517286#msg517286 ,
cited a paper
Quote from: David V. Bowen
arXiv:astro-ph/0605730v1  QSO Absorption Lines from QSOs
search for metal absorption lines in the spectra of background QSOs whose sightlines pass close to foreground QSOs
His four pairs were (DR8 ID's of the foreground )
1237661384384446484
1237654383585656942
1237652943707177102
1237652600100619101




c_cld

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Re: Thursday 14th July 2011: a binary quasar
« Reply #19 on: August 03, 2011, 03:34:49 pm »
I wonder if Zooites could hunt for more?


Here is an update of literature:
arXiv:1106.3183v1 [astro-ph.CO] 16 Jun 2011 binary quasar Q 0151+048
Quote from: Tayyaba Zafar
Q0151+048 is a physical quasar (QSO) pair at z ∼ 1.929 with a separation of 3.3 arcsec on the sky. In the spectrum of the brighter member of this pair, Q0151+048A, a damped Lyα absorber (DLA) is observed at a higher redshift. We have previously detected the host galaxies of both QSOs as well as a Lyα blob whose emission surrounding Q0151+048A extends over 5 × 3.3 arcsec. We seek to constrain the geometry of the system and understand the possible relations between the DLA, the Lyα blob and the two QSOs...
we conclude that the Lyα blob is associated with Q0151+048A rather than with the DLA. The DLA must be located in front of both the Lyα blob and Q0151+048A at a distance larger than 30 kpc and has a velocity relative to the blob of 640 ± 70 km/s.

with reference  to Keel, W. C., Cohen, S. H., Windhorst, R. A., & Waddington, I. 1999, AJ, 118, 2547
QSO B0151+0448  1237678662510182409 SDSS J015353.88+050257.0


zutopian

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Re: Thursday 14th July 2011: a binary quasar
« Reply #20 on: March 07, 2012, 10:28:27 am »
Warning: this topic has not been posted in for at least 120 days.
Unless you're sure you want to reply, please consider starting a new topic.

New paper:
Binary quasars were found during a quasar lens survey in DR7:

Quote
In addition to these lensed quasars, we have identified 81 pairs of quasars from follow-up spectroscopy, 26 of which are physically associated binary quasars.
"The Sloan Digital Sky Survey Quasar Lens Search. V. Final Catalog from the Seventh Data Release"
Naohisa Inada, Masamune Oguri, Min-Su Shin, Issha Kayo, Michael A. Strauss, Tomoki Morokuma, Cristian E. Rusu, Masataka Fukugita, Christopher S. Kochanek, Gordon T. Richards, Donald P. Schneider, Donald G. York, Neta A. Bahcall, Joshua A. Frieman, Patrick B. Hall, Richard L. White
(Submitted on 6 Mar 2012)
http://arxiv.org/abs/1203.1087

zutopian

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Re: Thursday 14th July 2011: a binary quasar
« Reply #21 on: February 18, 2013, 09:10:46 pm »
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"Binary Quasars at High Redshift I: 24 New Quasar Pairs at z ~ 3-4"
Joseph F. Hennawi, Adam D. Myers, Yue Shen, Michael A. Strauss, S. G. Djorgovski, Xiaohui Fan, Eilat Glikman, Ashish Mahabal, Crystal L. Martin, Gordon T. Richards, Donald P. Schneider, Francesco Shankar
(Submitted on 26 Aug 2009)
http://arxiv.org/abs/0908.3907

zutopian

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Re: Thursday 14th July 2011: a binary quasar
« Reply #22 on: October 24, 2013, 05:55:48 pm »
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Copy from another topic:

Please see topic "binary quasars" in SpaceWarps:

http://talk.spacewarps.org/#/boards/BSW0000005/discussions/DSW0000c1n


and "Quasar Questions"

http://talk.spacewarps.org/#/boards/BSW0000004/discussions/DSW0000bvn?page=1&comment_id=526613e6fe16d9014b0000c7


zutopian

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Re: Thursday 14th July 2011: a binary quasar
« Reply #23 on: October 24, 2013, 05:59:53 pm »
When two become one: an apparent QSO pair turns out to be a single quasar
Guido Cupani, Stefano Cristiani, Valentina D'Odorico, Bo Milvang-Jensen, Jens-Kristian Krogager
Quote
We report on our serendipitous discovery that the objects Q 01323-4037 and Q 0132-4037, listed in the V\'eron-Cetty & V\'eron catalog (2006) as two different quasars, are actually a quasar and a star. We briefly discuss the origin of the misidentification, and provide a refined measurement of the quasar redshift
(Submitted on 14 Mar 2011)
http://arxiv.org/abs/1103.2737

EDIT to add:

Reclassification of the nearest quasar pair candidate: SDSS J15244+3032 - RXS J15244+3032
Quote
We present optical spectroscopy of the nearest quasar pair listed in the 13th edition of the Veron-Cetty & Veron catalogue, i.e. the two quasars SDSS J15244+3032 and RXS J15244+3032 (redshift z~0.27, angular separation ~7 arcsec, and line-of-sight velocity difference ~1900 km/s). This system would be an optimal candidate to investigate the mutual interaction of the host galaxies with ground based optical imaging and spectroscopy. However, new optical data demonstrate that RXS J15244+3032 is indeed a star of spectral type G.
E. P. Farina, R. Falomo, A. Treves, R. Decarli, J. Kotilainen, R. Scarpa
(Submitted on 6 Feb 2013)
http://arxiv.org/abs/1302.1371
« Last Edit: June 14, 2014, 05:40:10 am by zutopian »

zutopian

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Re: Thursday 14th July 2011: a binary quasar
« Reply #24 on: June 08, 2014, 05:37:03 am »
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http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587736541487825060

Caught in the Act: Discovery of a Physical Quasar Triplet
E. P. Farina, C. Montuori, R. Decarli, M. Fumagalli
(Submitted on 4 Feb 2013)
http://arxiv.org/abs/1302.0849