J/AJ/112/62 J/AJ/112/62 Quasar absorption-line systems A M Tanner J Bechtold C E Walker J H Black R M Cutri Astron. J. 112 62 1996 1996AJ....112...62T Photometry, infrared QSOs Redshifts A survey of quasar absorbers was conducted using the Infrared Astronomical Satellite (IRAS) database. Quasars with known intervening absorption-line systems and broad absorption line (BAL) QSOs were selected primarily from Junkkarinen et al. (1991ApJS...77..203J). Of the 570 quasars with IRAS data, 52 showed 3{sigma} or better detections in at least one band in SCANPI analysis. The origin of the IRAS flux could be from the absorption-line systems, other galaxies, or the quasar itself. The spectral energy distributions for quasars detected in the absorption-line sample and BAL QSOs were found to be redder than those of two control samples which suggests that some of the IRAS flux may arise in dust associated with the intervening galaxies. IRAS SUPERSCANPI processing was carried out for 77 quasars with known Mg II absorption at Zabs<1 to investigate the ensemble far-infrared properties of these objects. SUPERSCANPI processing evaluates the median flux for many different positions on the sky, resulting in an improvement in the effective sensitivity. A control sample consisting of objects with no Mg II absorption known at Zabs<1 but with the same distribution of absolute V-magnitude, Zem and radio-loud fraction for the background quasars was also processed. The Mg II sample was detected at 3{sigma} or better in all four IRAS bands with a significantly larger flux than the control sample at 60{mu}m and 100{mu}m. If this far-infrared emission is from the absorber galaxies, then the far-infrared luminosity of the composite Mg II absorber was found to be comparable to that of a starbursting galaxy, although such a high star-formation rate is inconsistent with the optical and near-infrared colors of low-redshift Mg II systems. Four of the quasars with individual IRAS detections have intervening galaxies identified with the Mg II absorption-lines. The spectral energy distributions of these galaxies imply far-infrared luminosities in excess of what Arp 220 would give at their redshifts. While all the external evidence suggests that the detection of far-infrared emission from the absorber sample may not be connected to the presence of the Mg II absorber, we discuss future observations which may help explain our results.

IRAS

QSO Quasar name --- r_QSO Reference number=1 a : Steidel & Sargent (1992ApJS...80....1S) b : Aldcroft et al. (1994ApJS...93....1A) c : Lanzetta et al. (1991ApJS...77....1L) d : Junkkarinen et al. (1991, Cat. <J/ApJS/77/203>) e : White et al. (1993ApJ...407..456W) f : Turnshek et al. (1989ApJ...344..567T) g : Wolfe et al. (1986ApJS...61..249W) h : Francis & Hewitt (1993AJ....105.1633F) --- zem Emission redshift --- zabs Absorption redshift --- Vmag V magnitude from Hewitt & Burbidge (1993ApJS...87..451H) mag RL Radio loudness number=2 RL=log[f_v_(5GHz)/f_v_(V)], where f_v_(5GHz) is the radio flux density at 5GHz and [f_v_(V) is the V band flux density, based on 5 GHz flux densities from Veron-Cetty & Veron (1987, See Cat. VII/188) --- QSO Quasar name --- Note Note number=1 c : galaxies or quasars in vicinity visible on Palomar Sky Survey. d : UGC 439, IRAS source is 45 arcseconds northwest of quasar. e : bright stars nearby visible on Palomar Sky Survey. f : IRAS source is 1 arcminute northwest of quasar. g : IRAS source is 30 arcseconds southeast of quasar. h : IRAS source is 1 arcminute north of quasar. i : NGC 3067, IRAS source is 2 arcminutes southwest of quasar. k : IRAS source is 1 arcminute south of quasar. l : NGC 6045. m : ESO 400-G012. --- zem Emission redshift --- Vmag V magnitude mag zabs Absorption redshift --- RAh Right ascension (1950.0) h RAm Right ascension (1950.0) min RAs Right ascension (1950.0) s DE- Declination --- DEd Declination (1950.0) deg DEm Declination (1950.0) arcmin DEs Declination (1950.0) arcsec l_S12um Limit flag on 12um --- S12um IRAS flux at 12um number=2 3 sigma upper limits given when not detected Jy e_S12um rms uncertainty on S12um Jy l_S25um Limit flag on 25um --- S25um IRAS flux at 25um number=2 3 sigma upper limits given when not detected Jy e_S25um rms uncertainty on S25um Jy l_S60um Limit flag on 60um number=2 3 sigma upper limits given when not detected --- S60um IRAS flux at 60um Jy e_S60um rms uncertainty on S60um Jy l_S100um Limit flag on 100um number=2 3 sigma upper limits given when not detected --- S100um IRAS flux at 100um Jy e_S100um rms uncertainty on S100um Jy RL Radio loudness number=3 RL=log[f_v_(5GHz)/f_v_(V)], where f_v_(5GHz) is the radio flux density at 5GHz and [f_v_(V) is the V band flux density, based on 5 GHz flux densities from Veron-Cetty & Veron (1987, See Cat. VII/188) unless otherwise stated. j : RL based on 5 GHz flux densities from Kellerman et al. (1994AJ....108.1163K). B : BL Lac O : OVV --- n_RL Note on RL number=3 RL=log[f_v_(5GHz)/f_v_(V)], where f_v_(5GHz) is the radio flux density at 5GHz and [f_v_(V) is the V band flux density, based on 5 GHz flux densities from Veron-Cetty & Veron (1987, See Cat. VII/188) unless otherwise stated. j : RL based on 5 GHz flux densities from Kellerman et al. (1994AJ....108.1163K). B : BL Lac O : OVV --- zabs2 Second absorption redshift --- zabs3 Second absorption redshift --- zabs4 Second absorption redshift --- zabs5 Second absorption redshift --- zabs6 Second absorption redshift --- zabs7 Second absorption redshift --- zabs8 Second absorption redshift --- zabs9 Second absorption redshift --- zabs10 Second absorption redshift --- QSO Quasar name --- n_QSO Note number=1 a: Objects with individual IRAS detections b: Removed for the control list for SUPERSCANPI without IRAS detections --- zem Emission redshift --- zabs Absorption redshift --- Vmag V magnitude mag RL Radio loudness --- Ref References, for table6 only number=2 1: Aldcroft et al. (1994ApJS...93....1A) 2: Steidel & Sargent (1992ApJS...80....1S) 3: Barthel et al. (1990A&AS...82..339B) --- James Marcout, Patricia Bauer CDS 1997Jun17 UNKNOWN UNKNOWN Prepared via OCR at CDS. In table6, for QSO 0736-0620, V=718.5 in the printed version, we change this value in 18.5 in the electronic table J_AJ_112_62.xml