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J/ApJS/97/1         HST  Quasar Absorption Line Key Project. X. (Lockman+ 1995)
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The Hubble Space Telescope Quasar Absorption Line Key Project. X.
Galactic H I 21 centimeter emission toward 143 quasars and
active galactic nuclei.
    Lockman F.J., Savage B.D.
   <Astrophys. J. Suppl. Ser. 97, 1 (1995)>
   =1995ApJS...97....1L
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ADC_Keywords: QSOs ; Radial velocities ; Redshifts ; H I data
Mission_Name: HST
Keywords: galaxies: active - galaxies: quasars: absorption lines -
          Galaxy: halo - ISM: clouds - radio lines: ISM

Abstract:
    Sensitive H I 21cm emission line spectra have been measured for the
    directions to 143 quasars and AGNs chosen from the observing lists for
    the HST Quasar Absorption Line Key Project. Narrow-band and wide-band
    data were obtained with the NRAO 43m radio telescope for each object.
    The narrow-band data have a velocity resolution of 1km/s, extend from
    -220 to +170km/s, and are corrected for stray 21cm radiation. The
    wide-band data have a resolution of 4km/s and extend from -1000 to
    +1000km/s. The data are important for the interpretation of
    ultraviolet absorption lines near zero redshift in Key Project
    spectra. Twenty-two percent of the quasars lie behind Galactic
    high-velocity H I clouds with |VLSR|>100km/s whose presence can
    increase the equivalent width of interstellar absorption lines
    significantly. This paper contains the emission spectra and measures
    of the H I velocities and column densities along the sight line to
    each quasar. We discuss how the measurements can be used to estimate
    the visual and ultraviolet extinction toward each quasar and to
    predict the approximate strength of the strong ultraviolet resonance
    lines of neutral gas species in the HST Key Project spectra.

File Summary:
--------------------------------------------------------------------------------
 FileName    Lrecl  Records    Explanations
--------------------------------------------------------------------------------
ReadMe          80        .    This file
table1.dat      98      143    Objects, velocities, and column densities
notes.dat       80       30    Numbered notes
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units      Label    Explanations
--------------------------------------------------------------------------------
   1- 12  A12    ---        Name     Object name
  14- 15  I2     h          RAh      Right ascension (1950.0)
  17- 18  I2     min        RAm      Right ascension (1950.0)
  20- 23  F4.1   s          RAs      Right ascension (1950.0)
      25  A1     ---        DE-      Declination sign
  26- 27  I2     deg        DEd      Declination
  29- 30  I2     arcmin     DEm      Declination
  32- 33  I2     arcsec     DEs      Declination
  35- 40  F6.2   deg        GLON     Galactic longitude
  42- 47  F6.2   deg        GLAT     Galactic latitude
  49- 53  F5.2   mag        Vmag     V magnitude
  55- 59  F5.3   ---        z        Redshift
      61  A1     ---      l_E(B-V)   Limit flag on E(B-V)
  62- 66  F5.3   mag        E(B-V)   B-V colour excess
  68- 71  I4     km/s       V-       Observed negative LSR velocity limit
                                      of HI emission
  73- 75  I3     km/s       V+       Observed positive LSR velocity limit
                                      of HI emission
  77- 79  I3     km/s       <V>      Average LSR velocity of the HI emission
  81- 85  F5.1   10+19cm-2  N(HI)i   Integrated HI column density assuming
                                     the emission to be optically thin
  87- 91  F5.1   10+19cm-2  N(HI)200 Integrated HI column density assuming
                                      a spin temperature of 200K
  93- 98  A6     ---        Note     Comma-separated notes (see file notes.dat)
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Byte-by-byte Description of file: notes.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    ---     NoteNo    Note number, repeated when several lines
   4- 80  A77   ---     Text      Text of note
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History: Prepared via OCR at CDS.
  * 09-Jul-1997: about a dozen missing notes (1) detected by H. Andernach
               were corrected.
  * 03-Apr-2000: notes inserted in a dedicated file.

References:
  Bahcall J.N. et al., Paper I.         =1993ApJS...87....1B
  Schneider D.P. et al., Paper II.      =1993ApJS...87...45S
  Savage B.D. et al., Paper III.        =1993ApJ...413..116S
  Turnshek D.A. et al., Paper IV.       =1994ApJ...428...93T
  Stengler-Larrea E.A. et al., Paper V. =1995ApJ...444...64S
  Bergeron J. et al., Paper VI.         =1994ApJ...436...33B
  Bahcall J.N. et al., Paper VII.       =1996ApJ...457...19B
  Kirhakos S. et al., Papet VIII.       =1994PASP..106..646K
  Espey B.R. et al., Paper IX.          =1994ApJ...434..484E
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(End)                           James Marcout, Patricia Bauer [CDS]  27-Mar-1997