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J/ApJ/693/1554         Double QSOs: merger scenarios            (Foreman+, 2009)

Double quasars: probes of black hole scaling relationships and merger scenarios. Foreman G., Volonteri M., Dotti M. <Astrophys. J., 693, 1554-1562 (2009)> =2009ApJ...693.1554F
ADC_Keywords: QSOs ; Redshifts Keywords: black hole physics - galaxies: active - galaxies: evolution - quasars: general Abstract: We analyze the available sample of double quasars, and investigate their physical properties. Our sample comprises 85 pairs, selected from the Sloan Digital Sky Survey (SDSS). We derive physical parameters for the engine and the host, and model the dynamical evolution of the pair. First, we compare different scaling relationships between massive black holes and their hosts (bulge mass, velocity dispersion, and their possible redshift dependences), and discuss their consistency. We then compute dynamical friction timescales for the double quasar systems to investigate their frequency and their agreement with the "merger driven" scenario for quasar triggering. Description: For our sample, we select a total of 85 quasar pairs reported in the following papers: Hennawi et al. (2006; Cat. J/AJ/131/1), Myers et al. (2007; Cat. J/ApJ/658/99), and Myers et al. (2008; Cat. J/ApJ/678/635). The quasars in our sample are selected as physical pairs rather than lenses. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 113 84 Properties of the double quasar sample
See also: VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004) J/ApJS/180/67 : Photometric selection of quasars from SDSS. II. (Richards+, 2009) J/MNRAS/392/1539 : Metal absorption systems in pairs of QSOs (Tytler+, 2009) J/ApJS/175/29 : Spectroscopy of QSO pairs (Marble+, 2008) J/MNRAS/391/1457 : Lymanα forest in QSO pairs (Kirkman+, 2008) J/ApJ/678/635 : Spectroscopy of quasar binary candidates (Myers+, 2008) J/ApJ/658/99 : Pairs of QSO in SDSS-DR4 (Myers+, 2007) J/AJ/131/1 : Binary quasars in the SDSS (Hennawi+, 2006) J/ApJS/155/257 : NBC Quasar Candidate Catalog (Richards+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Cat Catalog: SDSS or 2QZ 5- 14 A10 --- Name Name of the pair (JHHMM+DDMM) 16- 19 F4.2 --- z Pair redshift 21- 26 F6.2 kpc Rmax Physical separation between the two quasars 28- 34 E7.3 TLsun LB1 QSO1 luminosity (in 1012☉) 36- 42 E7.3 TLsun e_LB1 LB1 uncertainty (in 1012☉) 44- 50 E7.3 TLsun LB2 QSO2 luminosity (in 1012☉) 52- 58 E7.3 TLsun e_LB2 LB2 uncertainty (in 1012☉) 60- 66 E7.3 GMsun Mbh1 BH mass for QSO1 (in 109☉) 68- 75 E8.4 GMsun E_Mbh1 Positive error on Mbh1 (in 109☉) 77- 83 E7.3 GMsun e_Mbh1 Negative error on Mbh1 (in 109☉) 85- 91 E7.3 GMsun Mbh2 BH mass for QSO2 (in 109☉) 93-100 E8.4 GMsun E_Mbh2 Positive error on Mbh2 (in 109☉) 102-108 E7.3 GMsun e_Mbh2 Negative error on BHMass2 (in 109☉) 110-113 A4 --- r_z Reference(s) for the photometric or spectroscopic information (1)
Note (1): References as follows: 1 = Hennawi et al. (2006, Cat. J/AJ/131/1; <[HSO2006] JHHMM+DDMMA> in Simbad) 2 = Myers et al. (2007, Cat. J/ApJ/658/99) 3 = Myers et al. (2008, Cat. J/ApJ/678/635; <[MRB2008] JHHMM+DDMMA> in Simbad) A = Vestergaard et al. (2008ApJ...674L...1V)
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 16-Mar-2011
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