J/AJ/150/111                     KODIAQ DR1                     (O'Meara+, 2015)
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The first data release of the KODIAQ survey.
    O'Meara J.M., Lehner N., Howk J.C., Prochaska J.X., Fox A.J., Swain M.A.,
    Gelino C.R., Berriman G.B., Tran H.
   <Astron. J., 150, 111 (2015)>
   =2015AJ....150..111O    (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Redshifts
Keywords: catalogs - intergalactic medium - quasars: absorption lines -
          quasars: general - surveys

Abstract:
    We present and make publicly available the first data release (DR1) of
    the Keck Observatory Database of Ionized Absorption toward Quasars
    (KODIAQ) survey. The KODIAQ survey is aimed at studying galactic and
    circumgalactic gas in absorption at high redshift, with a focus on
    highly ionized gas traced by O vi, using the HIRES spectrograph on the
    KeckI telescope. KODIAQ DR1 consists of a fully reduced sample of 170
    quasars at 0.29<z_em_<5.29 observed with HIRES at high resolution
    (36000{<=}R{<=}103000) between 2004 and 2012. DR1 contains 247 spectra
    available in continuum normalized form, representing a sum total
    exposure time of ~1.6 megaseconds. These coadded spectra arise from a
    total of 567 individual exposures of quasars taken from the Keck
    Observatory Archive (KOA) in raw form and uniformly processed using a
    publicly available HIRES data reduction package. DR1 is publicly
    available to the community, housed as a higher level science product
    at the KOA. We will provide future data releases that make available
    additional quasars, including those with pre-2004 observations taken
    with the previous-generation HIRES detectors.

Description:
    As part of the Keck Observatory Database of Ionized Absorption toward
    Quasars (KODIAQ) survey, we have uniformly processed the HIRES spectra
    of hundreds of quasars. The HIRES spectrograph is located on the KeckI
    telescope. In this work, we present the first Data Release (DR1) from
    the survey.

    Data taken over the last two decades from the HIRES spectrograph fall
    into three general categories. The first is the earliest data from
    1995 to 1997. The second category spans the years 1997-2004. Finally,
    the third category covers data from 2004 to the present. The data in
    DR1 are all drawn from this last category.

    The KODIAQ DR1 comprises 170 quasars observed in the mosaic
    configuration of HIRES between 2004 and 2012. Note that one quasar is
    a lensed system, so the number of individual sightlines is 171. The
    DR1 sample is summarized in Table2.

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table2.dat      88        234    Sample from the first Data Release (DR1) of the
                                 Keck Observatory Database of Ionized Absorption
                                 toward Quasars (KODIAQ)
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See also:
 J/MNRAS/345/609 : Variability of the fine-structure constant (Murphy+, 2003)

Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label     Explanations
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   1- 15  A15   ---     Name      Quasar designation (JHHMMSS+DDMMSSA format)
  17- 18  I2    h       RAh       Hour of Right Ascension (J2000) (1)
  20- 21  I2    min     RAm       Minute of Right Ascension (J2000) (1)
  23- 27  F5.2  s       RAs       Second of Right Ascension (J2000) (1)
      29  A1    ---     DE-       Sign of the Declination (J2000) (1)
  30- 31  I2    deg     DEd       Degree of the Declination (J2000) (1)
  33- 34  I2    arcmin  DEm       Arcminute of Declination (J2000) (1)
  36- 40  F5.2  arcsec  DEs       Arcsecond of Declination (J2000) (1)
  42- 47  F6.4  ---     zem       [0.297/5.292] Emission redshift (1)
  49- 57  A9    ---     Date      Observation date
  59- 69  A11   ---     PI        Principal Investigator
  71- 75  I5    s       Exp       [600/25200] Total exposure time
  77- 78  A2    ---     Decker    HIRES decker (B2, B5, C1, C5, or E3) (2)
  80- 83  I4    0.1nm   lambda0   [2995/5733] Lower value of wavelength coverage
                                   (in {AA})
      84  A1    ---     ---       [-]
  85- 88  I4    0.1nm   lambda1   [5535/9725] Upper value of wavelength coverage
                                   (in {AA})
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Note (1): J2000 coordinates and quasar redshifts are determined by passing the
     quasar coordinates from the raw data header through SIMBAD or SDSS and
     choosing the appropriate match.
Note (2): HIRES has a number of user-selectable instrument element settings.
     These include detector binning, entrance slit width and length (set
     simultaneously by choosing a decker), and echelle and cross-disperser
     angle. The vast majority of HIRES data in DR1 were obtained with the C1 or
     C5 decker that provide FWHM R=48000 and R=36000, corresponding to velocity
     resolutions of 6.2 and 8.3km/s (FWHM), respectively.
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History:
    From electronic version of the journal

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(End)                                    Sylvain Guehenneux [CDS]    05-Apr-2016