J/ApJS/195/16      HST survey for Lyman limit systems. I.       (O'Meara+, 2011)
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The Advanced Camera for Surveys+Wide Field Camera 3 Survey for Lyman limit
systems.
I. The data.
    O'Meara J.M., Xavier Prochaska J., Chen H.-W., Madau P.
   <Astrophys. J. Suppl. Ser., 195, 16 (2011)>
   =2011ApJS..195...16O
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ADC_Keywords: Surveys ; Spectra, ultraviolet ; QSOs ; Photometry, SDSS
Keywords: intergalactic medium - methods: data analysis - quasars:
          absorption lines - quasars: general - surveys - ultraviolet: general

Abstract:
    We present a set of 71 quasars observed in the near ultraviolet with
    the PR200L prism on the Advanced Camera for Surveys and the G280 grism
    on the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope.
    The quasars were selected from the Sloan Digital Sky Survey data to
    search for intervening Lyman limit system (LLS) absorption. The sample
    was subjected to the constraints that the quasars have AB magnitude
    g'<18.5, quasar emission redshift 2.3<z_em_<2.6, and lack strong BAL
    or z~z_em_ absorption. The median emission redshift of the sample is
    {bar}z=2.403. The data were all processed using custom data reduction
    pipelines, and the one-dimensional spectra have sufficient
    signal-to-noise ratio and resolution to easily identify absorption
    from LLS over the redshift range 1.2<z<2.5. The WFC3 data presented
    here are the first non-calibration spectra from the G280 grism.

Description:
    The sample of quasars was chosen from the SDSS Data Release 5 (Cat.
    II/276; superseded by II/294). Our survey consists in part of 18
    quasars observed in a snapshot program with the PR200L prism in the
    ACS on HST (Cycle 15, program ID 10878). In addition to the ACS
    sample, we observed 54 quasars with the UVIS G280 grism in the WFC3 on
    HST (Cycle 17, program ID 11594).

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table1.dat     57      100   Full input sample of HST QSOs
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See also:
   B/hst  : HST Archived Exposures Catalog (STScI, 2007)
   II/276 : The SDSS Photometric Catalog, Release 5 (Adelman-McCarthy+, 2007)
   J/ApJ/690/1181 : UV-bright quasars (Syphers+, 2009)
   J/AJ/137/3761  : Ultraviolet quasi-stellar objects (Bianchi+, 2009)
   J/AJ/133/1780  : GALEX/SDSS quasar catalog (Trammell+, 2007)
   http://www.stsci.edu/hst/acs  : Advanced Camera for Surveys home page
   http://www.stsci.edu/hst/wfc3 : Wide Field Camera 3 home page
   http://cosmo.smcvt.edu/groups/hstacswfc3survey/ : HST ACS+WFC3 Survey page
   http://www.sdss.org/ : The Sloan Digital Sky Survey home page

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  4  A4    ---     ---       [SDSS]
   5- 13  A9    ---     SDSS      Quasar identification (HHMM+DDMM; J2000)
      14  A1    ---   f_SDSS      [c-f] Other identification for SDSS quasar (1)
  16- 17  I2    h       RAh       Hour of right ascension (J2000)
  19- 20  I2    min     RAm       Minute of right ascension (J2000)
  22- 27  F6.3  s       RAs       Second of right ascension (J2000)
      29  A1    ---     DE-       Sign of declination (J2000)
  30- 31  I2    deg     DEd       Degree of declination (J2000)
  33- 34  I2    arcmin  DEm       Arcminute of declination (J2000)
  36- 40  F5.2  arcsec  DEs       Arcsecond of declination (J2000)
  42- 46  F5.3  ---     zem       SDSS quasar emission redshift
  48- 52  F5.2  mag     g'mag     SDSS quasar AB g'-band magnitude
  54- 57  A4    ---     Inst      HST instrument (2)
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Note (1): Flag as follows:
   c = a.k.a. [HB89] 1333+459.
   d = a.k.a. LBQS 1334+0212.
   e = a.k.a. FBQS J1415+3706.
   f = a.k.a. KP77.
Note (2): Quasars marked "ACS" were observed during Cycle 15, Program ID 10878,
     with the PR200L prism. Quasars marked "WFC3" were observed during
     Cycle 17, Program ID 11594, with the G280 grism.
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History:
    From electronic version of the journal

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(End)                                     Emmanuelle Perret [CDS]    27-Sep-2011