SIMBAD references

2006AJ....131....1H - Astron. J., 131, 1-23 (2006/January-0)

Binary quasars in the Sloan Digital Sky Survey: evidence for excess clustering on small scales.

HENNAWI J.F., STRAUSS M.A., OGURI M., INADA N., RICHARDS G.T., PINDOR B., SCHNEIDER D.P., BECKER R.H., GREGG M.D., HALL P.B., JOHNSTON D.E., FAN X., BURLES S., SCHLEGEL D.J., GUNN J.E., LUPTON R.H., BAHCALL N.A., BRUNNER R.J. and BRINKMANN J.

Abstract (from CDS):

We present a sample of 221 new quasar pairs with proper transverse separations Rprop<1 h–1 Mpc over the redshift range 0.5<z<3.0, discovered from an extensive follow-up campaign to find companions around the Sloan Digital Sky Survey and 2dF QSO Redshift Survey quasars. This sample includes 26 new binary quasars with separations Rprop<50 h–1 kpc (θ<10''), more than doubling the number of such systems known. We define a statistical sample of binaries selected with homogeneous criteria and compute its selection function, taking into account sources of incompleteness. The first measurement of the quasar correlation function on scales 10 h–1 kpc<Rprop<400 h–1 kpc is presented. For Rprop≲40 h–1 kpc, we detect an order of magnitude excess clustering over the expectation from the large-scale (Rprop≳3 h–1 Mpc) quasar correlation function, extrapolated down as a power law (γ=1.53) to the separations probed by our binaries. The excess grows to ∼30 at Rprop∼10 h–1 kpc and provides compelling evidence that the quasar autocorrelation function gets progressively steeper on submegaparsec scales. This small-scale excess can likely be attributed to dissipative interaction events that trigger quasar activity in rich environments. Recent small-scale measurements of galaxy clustering and quasar-galaxy clustering are reviewed and discussed in relation to our measurement of small-scale quasar clustering.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Cosmology: Large-Scale Structure of Universe - Galaxies: Quasars: General - Surveys

VizieR on-line data: <Available at CDS (J/AJ/131/1): table2.dat table3.dat table4.dat table8.dat table9.dat table10.dat>

Nomenclature: Tables 2,3,4,8,9,10: [HSO2006] SDSS JHHMM+DDMMA, [HSO2006] 2QZ JHHMM+DDMMA N=890.

CDS comments: Table 1 : Q1120+0195 incorrect for Q1120+019 (=UM 425, not UM 144 as mentioned in note 2)

Simbad objects: 1635

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2020.09.18-11:03:52

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