PMN J1838-3427:: A new gravitationally lensed quasar

被引:35
作者
Winn, JN [1 ]
Hewitt, JN
Schechter, PL
Dressler, A
Falco, EE
Impey, CD
Kochanek, CS
Lehár, J
Lovell, JEJ
McLeod, BA
Morgan, ND
Muñoz, JA
Rix, HW
Ruiz, MT
机构
[1] MIT, Dept Phys, Cambridge, MA 02139 USA
[2] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[4] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[5] CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
[6] Inst Astrofis Canarias, E-38200 La Laguna, Tenerife, Spain
[7] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[8] Univ Chile, Dept Astron, Santiago, Chile
关键词
distance scale; gravitational lensing; quasars : individual (PMN J1838-3427);
D O I
10.1086/316874
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the discovery of a new double-image quasar that was found during a search for gravitational lenses in the southern sky. Radio source PMN J1838-3427 is composed of two flat-spectrum components with separation 1."0, flux density ratio 14:1, and matching spectral indices in VLA and VLBA images. Ground-based BRI images show the optical counterpart (total I = 18.6) is also double, with the same separation and position angle as the radio components. An HST/WFPC2 image reveals the lens galaxy. The optical flux ratio (27: 1) is higher than the radio value, probably because of differential extinction of the components by the lens galaxy. An optical spectrum of the bright component contains quasar emission lines at z = 2.78 and several absorption features, including prominent Ly alpha absorption. The lens galaxy redshift could not be measured, but it is estimated to be z = 0.36 +/- 0.08. The image configuration is consistent with the simplest plausible models for the lens potential. The flat radio spectrum and observed variability of PMN J1838-3427 suggest that the time delay between flux variations of the components is measurable and could thus provide an independent measurement of H-o.
引用
收藏
页码:2868 / 2878
页数:11
相关论文
共 25 条
[1]  
[Anonymous], 1994, Bull. Am. Astron. Soc
[2]   Values of H0 from models of the gravitational lens 0957+561 [J].
Bernstein, G ;
Fischer, P .
ASTRONOMICAL JOURNAL, 1999, 118 (01) :14-34
[3]   The NRAO VLA Sky Survey [J].
Condon, JJ ;
Cotton, WD ;
Greisen, EW ;
Yin, QF ;
Perley, RA ;
Taylor, GB ;
Broderick, JJ .
ASTRONOMICAL JOURNAL, 1998, 115 (05) :1693-1716
[4]   The Texas survey of radio sources covering -35.degrees 5<delta<71.degrees 5 at 365 MHz [J].
Douglas, JN ;
Bash, FN ;
Bozyan, FA ;
Torrence, GW ;
Wolfe, C .
ASTRONOMICAL JOURNAL, 1996, 111 (05) :1945-1963
[5]   Limits on cosmological models from radio-selected gravitational lenses [J].
Falco, EE ;
Kochanek, CS ;
Munoz, JA .
ASTROPHYSICAL JOURNAL, 1998, 494 (01) :47-59
[6]   STATISTICAL PROPERTIES OF GRAVITATIONAL LENSES WITH A NONZERO COSMOLOGICAL CONSTANT [J].
FUKUGITA, M ;
FUTAMASE, T ;
KASAI, M ;
TURNER, EL .
ASTROPHYSICAL JOURNAL, 1992, 393 (01) :3-21
[7]   THE PARKES MIT NRAO (PMN) SURVEYS .1. THE 4850 MHZ SURVEYS AND DATA REDUCTION [J].
GRIFFITH, MR ;
WRIGHT, AE .
ASTRONOMICAL JOURNAL, 1993, 105 (05) :1666-1679
[8]   THE PHOTOMETRIC PERFORMANCE AND CALIBRATION OF WFPC2 [J].
HOLTZMAN, JA ;
BURROWS, CJ ;
CASERTANO, S ;
HESTER, JJ ;
TRAUGER, JT ;
WATSON, AM ;
WORTHEY, G .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1995, 107 (717) :1065-1093
[9]   Shear and ellipticity in gravitational lenses [J].
Keeton, CR ;
Kochanek, CS ;
Seljak, U .
ASTROPHYSICAL JOURNAL, 1997, 482 (02) :604-620
[10]   The fundamental plane of gravitational lens galaxies and the evolution of early-type galaxies in low-density environments [J].
Kochanek, CS ;
Falco, EE ;
Impey, CD ;
Lehár, J ;
McLeod, BA ;
Rix, HW ;
Keeton, CR ;
Muñoz, JA ;
Peng, CY .
ASTROPHYSICAL JOURNAL, 2000, 543 (01) :131-148