The first bright QSO survey

被引:115
作者
Gregg, MD
Becker, RH
White, RL
Helfand, DJ
McMahon, RG
Hook, IM
机构
[1] UNIV CALIF DAVIS, DAVIS, CA 95616 USA
[2] SPACE TELESCOPE SCI INST, BALTIMORE, MD 21218 USA
[3] COLUMBIA UNIV, COLUMBIA ASTROPHYS LAB, NEW YORK, NY 10027 USA
[4] UNIV CAMBRIDGE, INST ASTRON, CAMBRIDGE CB3 0HA, ENGLAND
[5] UNIV CALIF BERKELEY, BERKELEY, CA 94720 USA
关键词
D O I
10.1086/118024
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The FIRST radio survey provides a new resource for constructing a large quasar sample, With source positions accurate to better than 1 '' and a point source sensitivity limit of 1 mJy, it reaches 50 times deeper than previous radio catalogs, We report here on the results of the pilot phase for a FIRST Bright Quasar Survey (FBQS), Based on matching the radio catalog from the initial 300 deg(2) of FIRST coverage with the optical catalog from the Automated Plate Machine (APM) digitization of Palomar Sky Survey plates, we have defined a sample of 219 quasar candidates brighter than E = 17.50, We have obtained optical spectroscopy for 151 of these and classified 25 others from the literature, yielding 69 quasars or Seyfert 1 galaxies, of which 51 are new identifications. The brightest new quasar has an E magnitude of 14.6 and z = 0.91; four others are brighter than E = 16, The redshifts range from z = 0.12 to 3.42. Half of the detected objects are radio quiet with L(21-cm) < 10(32.5) ergs/s. We use the results of this pilot survey to establish criteria for the FBQS that will produce a quasar search program which will be 70% efficient and 95% complete to a 21-cm flux density limit of 1.0 mJy. (C) 1996 American Astronomical Society.
引用
收藏
页码:407 / 415
页数:9
相关论文
共 11 条
  • [1] THE FIRST SURVEY - FAINT IMAGES OF THE RADIO SKY AT 20 CENTIMETERS
    BECKER, RH
    WHITE, RL
    HELFAND, DJ
    [J]. ASTROPHYSICAL JOURNAL, 1995, 450 (02) : 559 - 577
  • [2] BECKER RH, 1995, IN PRESS RADIO EMISS
  • [3] THE HIGH SURFACE-DENSITY OF BRIGHT ULTRAVIOLET-EXCESS QUASARS
    GOLDSCHMIDT, P
    MILLER, L
    LAFRANCA, F
    CRISTIANI, S
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1992, 256 (04) : P65 - P68
  • [4] THE LARGE BRIGHT QUASAR SURVEY .6. QUASAR CATALOG AND SURVEY PARAMETERS
    HEWETT, PC
    FOLTZ, CB
    CHAFFEE, FH
    [J]. ASTRONOMICAL JOURNAL, 1995, 109 (04) : 1498 - 1521
  • [5] MCMAHON RG, 1992, ASTROPHYS SPACE SC L, V174, P417
  • [6] MINKOWSKI RL, 1963, STARS STELLAR SYSTEM, V3, P481
  • [7] RADIO PROPERTIES OF OPTICALLY SELECTED HIGH-REDSHIFT QUASARS .1. VLA OBSERVATIONS OF 22 QUASARS AT 6 CM
    SCHNEIDER, DP
    VANGORKOM, JH
    SCHMIDT, M
    GUNN, JE
    [J]. ASTRONOMICAL JOURNAL, 1992, 103 (05) : 1451 - 1456
  • [8] VERONCETTY MP, 1996, 10 EUR SO OBS SCI
  • [9] EVIDENCE FOR A LARGE UNDETECTED POPULATION OF DUST-REDDENED QUASARS
    WEBSTER, RL
    FRANCIS, PJ
    PETERSON, BA
    DRINKWATER, MJ
    MASCI, FJ
    [J]. NATURE, 1995, 375 (6531) : 469 - 471
  • [10] Weedman D., 1986, QUASAR ASTRONOMY