A search for binary quasars (not lensed)

• by Budgieye moderator

  Quasars and the transverse proximity effect

  is looking for binary quasars using an automated search, but they might find lensed ones too.

  http://rsaa.anu.edu.au/research/projects/quasars-and-transverse-proximity-effect

  ---

  Posted October 17, 2013 9:44 AM

• by c_cld

  Found possible binary QSO with angular separation= 8.24 arcsec

  1237674461485269353 z spec=2.458

  1237674461485269352 neighbor at left, without photoZ, but in QSO color space

  

  QSO pair or lensed? separation 8.3"

  hint of a galaxy sticked to the left QSO in need of spectra for both to answer the question... 😃

  [edit July 2015 18] ASW0004q3u

  

  Posted October 19, 2013 3:28 PM

• by c_cld

  QSO Pair

  1237652901299683622 z spec=2.243

  1237652901299683621 z spec=2.563

  separation 12.04 arcsec

  30 arcsec on the side

  [edit July 18 2015] ASW0001ytq

  at 12, near border

  and possible third at upper left corner 1237652901299683624 in QSO color-color space

  also bottom ASW0001ynl

  Posted October 22, 2013 8:17 PM

• by c_cld

  QSO pair

  1237678617406275614 z spec=0.909 at SDSS image center target

  1237678617406275612 z spec=0.907 south of target

  separation 7.1945 arcsec

  30 arcsec on the side

  [edit July 18 2015] ASW0008eog up right corner

  

  Posted October 22, 2013 8:31 PM

• by c_cld

  QSO pair

  1237670955717558315 z spec=0.807 at SDSS image center target

  1237670955717558313 z spec=1.369 south of target

  angular separation= 15.099 arcsec

  30 arcsec on the side

  Posted October 23, 2013 8:28 AM

• by c_cld

  QSO pair

  1237659324407480336 z spec=1.408 on target

  1237659324407480337 z = 0.61 in SE

  angular separation = 4.944 arcsec

  30 arcsec on the side

  in publication "2008ApJ...678..635M" http://arxiv.org/abs/0709.3474 😃

  ASW0007mip

  

  Posted October 23, 2013 8:42 AM

• by c_cld

  possible QSO pair from color-color space but no spectra

  (distinct objects or duplication of the same object lensed ?)

  1237674460411724146

  1237674460411724147

  angular separation = 3.244 arcsec

  

  ASW0000p5i

  

  Posted October 25, 2013 3:30 PM

• by Budgieye moderator

  Interesting to look at these quasars. It is still hard to be sure that they are quasars, and the colour isn't diagnostic. (and I didn't know that there is a dr10 out in SDSS)

  Posted October 25, 2013 9:23 PM

• by c_cld

  I agree that without spectrum, there is no certainty for an object to be a QSO.

  However we have criteria, literature and catalogs to assess probabilities of QSO candidates from ugriz fluxes data:

  paper: Quasar candidates selection in the Virtual Observatory era ; R. D'Abrusco et al. ;
  catalog J/MNRAS/396/223/qsos

  paper: Think Outside the Color Box: Probabilistic Target Selection and the SDSS-XDQSO Quasar Targeting Catalog; Jo Bovy (NYU), Joseph F. Hennawi (MPIA), David W. Hogg (NYU, MPIA) et al.; catalog SDSS-XDQSO catalog

  Posted October 26, 2013 7:57 AM

• by c_cld

  Selection from SDSS-XDQSO catalog for the pair (distinct objects or duplication of the same object lensed ?)

  1237674460411724146 pQSO=0.98168

  1237674460411724147 pQSO= 0.98975

  OBJID,RUN,RERUN,CAMCOL,FIELD,ID,RA,DEC,QSOLOWZLIKE,QSOHIZLIKE,QSOMIDZLIKE,STARLIKE,QSOLOWZNUMBER,QSOHIZNUMBER,QSOMIDZNUMBER,STARNUMBER,PSTAR,PQSOLOWZ,PQSOMIDZ,PQSOHIZ,PQSO,BITMASK,GOOD,PHOTOMETRIC,PSFMAG,PSFMAGERR,EXTINCTION_U
  " 1237674460411724146",6749,301,2,106,370,133.22370038298152,-1.813778654549527,33.709878780390476,3.123713607154969E-10,35.79693856353852,0.004390044464504447,5.572930682301541,0.1120848909427131,1.035135918737752,956.201732399025,0.0183216417152987,0.8199488724063376,0.16172948587821093,1.528143800680752E-13,0.9816783582847013,0,0,1,"(19.2139892578125, 18.831239700317383, 18.64374542236328, 18.55443000793457, 18.41375732421875)","(0.029934551566839218, 0.021135082468390465, 0.016507942229509354, 0.024068674072623253, 0.027634914964437485)",0.09256717562675476
  " 1237674460411724147",6749,301,2,106,371,133.22458426526788,-1.81395674677402,52.66508214540005,1.537767100407922E-11,8.635822977868164,0.008412944304933313,17.83544346448174,0.33308750727184583,3.692971022209333,1195.0554953663736,0.010246039606376095,0.9572527470553346,0.03250121333828415,5.219980165678207E-15,0.989753960393624,0,0,1,"(19.91958999633789, 19.642852783203125, 19.506505966186523, 19.379331588745117, 19.26053237915039)","(0.04564427584409714, 0.023643886670470238, 0.02353617176413536, 0.025930602103471756, 0.05301833897829056)",0.09255028516054153

  terapix

  ugr , gri , riz

  

  ASW0000p5i

  

  Posted October 26, 2013 8:12 AM

• by c_cld

  QSO pair candidate

  1237654872138842242

  1237654872138842241

  angular separation = 3.2716 arcsec

  

  

  [edit July 18 2015] ASW0005uq7

  

  and ASW0005vey border up

  Posted October 31, 2013 9:07 AM

• by c_cld

  QSO pair or QSO-star conjunction?

  1237658803118735477

  1237658803118735478

  angular separation = 3.0937 arcsec

  

  

  [edit July 18 2015] Star 1237658803118735477

  Boss spectrum in DR12

  Posted October 31, 2013 9:16 AM

• by c_cld

  QSO pair candidate

  1237661417139601562

  1237661417139601563

  angular separation = 4.0438 arcsec

  

  

  [edit July 18 2015] Star 1237661417139601562

  Boss spectrum in DR12

  Posted October 31, 2013 9:25 AM

• by c_cld

  QSO pair candidate lensed?

  1237655368759312565 pQSO = 0.658

  1237655368759312564 pQSO = 0.797

  angular separation = 2.61 arcsec

  

  

  from SDSS-XDQSO catalog :
  OBJID,RUN,RERUN,CAMCOL,FIELD,ID,RA,DEC,QSOLOWZLIKE,QSOHIZLIKE,QSOMIDZLIKE,STARLIKE,QSOLOWZNUMBER,QSOHIZNUMBER,QSOMIDZNUMBER,STARNUMBER,PSTAR,PQSOLOWZ,PQSOMIDZ,PQSOHIZ,PQSO,BITMASK,GOOD,PHOTOMETRIC,PSFMAG,PSFMAGERR,EXTINCTION_U
  " 1237655368759312564",2304,301,1,321,180,219.99680126014,56.55246574713785,5.852402792639619,2.5650807316774056E-6,2.898518147638769,0.03856296550132817,36.11515935449999,0.9142605687472907,10.355540792040125,1590.9608640089762,0.20266409860863654,0.6981852110147674,0.09915068262987471,7.746721245188023E-9,0.7973359013913633,0,0,1,"(21.025901794433594, 20.593887329101562, 20.407182693481445, 20.165225982666016, 19.798538208007812)","(0.09206917881965637, 0.05357877165079117, 0.05046883970499039, 0.06608200073242188, 0.11221592873334885)",0.09703706204891205
  " 1237655368759312565",2304,301,1,321,181,219.99811721299906,56.5524639519736,9.173216143963081,8.427162164649538E-5,1.817625278264066,0.12813403691474812,41.88090265449841,1.2978242224032566,14.070028791187122,1657.3104311738964,0.3413484858843037,0.6175430921921953,0.041108246120277234,1.7580322377987413E-7,0.6586515141156962,0,0,1,"(21.468952178955078, 21.025909423828125, 20.781150817871094, 20.446138381958008, 20.22997283935547)","(0.13524408638477325, 0.0814855620265007, 0.0713706985116005, 0.07402714341878891, 0.19869861006736755)",0.09702153503894806

  ASW0008rpd

  ASW0008sag

  Posted October 31, 2013 9:32 AM

• by c_cld

  QSO pair in ASW00045r3

  

  SDSS J022858.15-040740.1

  1237679323399193013

  SDSS J022857.63-040733.2

  1237679323399192775

  CFHTLS cutout

  Terapix

  ugr gri

  in GZ http://www.galaxyzooforum.org/index.php?topic=3874.msg644961#msg644961 Oct 29, 2013

  Posted July 18, 2015 10:43 AM

• by c_cld

  binary QSO ASW0003g0t at 7+ o'clock

  

  SDSS J022046.13-110036.4 1237673700203888809 ra 35.1922, dec -11.01012

  SDSS J022045.87-110036.7 1237673700203888808

  2006-11-18

  Posted February 11, 2017 2:27 PM