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FIRST 0747+2739: A FIRST/2MASS Quasar with an Overabundance of C IV Absorption Systems | | Gordon T. Richards
; Michael D. Gregg
; Robert H. Becker
; Richard L. White
; | | Date: |
28 Dec 2001 | | Journal: | March 2002, ApJ, 567, L13 | | Subject: | astro-ph | | Affiliation: | 2 and 3), Robert H. Becker (2 and 3), Richard L. White ( Penn State, UC-Davis, LLNL/IGPP, STSCI | | Abstract: | We present a Keck ESI spectrum of FIRST 074711.2+273904, a K=15.4 quasar with redshift 4.11 that is detected by both FIRST and 2MASS. The spectrum contains at least 14 independent C IV absorption systems longward of the Ly-alpha forest. These systems are found over a path length of Delta z = 0.984, constituting one of the highest densities per unit redshift of C IV absorption ever observed. One of the C IV systems is trough-like and resembles a weak BAL-type outflow. Two of the C IV are ``associated’’ absorption systems with |v|<3000 km/s. Of the 11 remaining systems with v>3000 km/s, eight are either resolved or require multiple discrete systems to fit the line profiles. In addition to C IV absorption, there are two low-ionization Mg II absorption systems along with two damped Ly-alpha systems, at least one of which may be a C IV system. The overdensity of C IV absorption spans a redshift range of Delta z=1. Superclusters along the line of sight are unlikely to cause an overdensity stretching over such a long redshift path, thus the absorption may be an example of narrow, high-velocity, intrinsic absorption that originates from the quasar. We suggest that this quasar is a member of a transitional class of BAL quasars where we are just barely seeing the spatial, density, or temporal edge of the BAL-producing region (or period); the multiple high-velocity absorption systems may be the remnants (or precursors) of a stronger BAL outflow. If correct, then some simpler absorption line complexes in other quasars may also be due to outflowing rather than intervening material. | | Source: | arXiv, astro-ph/0201447 | | Services: | Forum | Review | PDF | Favorites | |
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