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J/MNRAS/392/1539    Metal absorption systems in pairs of QSOs    (Tytler+, 2009)
Metal absorption systems in spectra of pairs of QSOs:
how absorbers cluster around QSOs and other absorbers.
    Tytler D., Gleed M., Melis C., Chapman A., Kirkman D., Lubin D.,
    Paschos P., Jena T., Crotts A.P.S.
   <Mon. Not. R. Astron. Soc., 392, 1539-1572 (2009)>
   =2009MNRAS.392.1539T
ADC_Keywords: QSOs ; Redshifts

Keywords: intergalactic medium - quasars: absorption lines - quasars: general -
          cosmology: observations

Abstract:
    We present the first large sample of metal absorption systems in pairs
    of QSOs with sightlines separated by about 1Mpc at z=2. We found
    690 absorption systems in the spectra of 310 QSOs in 170 pairings.
    Most systems show CIV or MgII absorption.

Description:
    We use spectra of the 310 QSOs which include 140 pairs and 10
    triplets. We use spectra that we obtained with LRIS on the Keck I
    telescope, the Kast spectrograph on the Lick 3-m Shane telescope and
    from CTIO and KPNO. We also use spectra from the SDSS data release 5
    (DR5). We obtained spectra with LRIS from 2001 to 2004 September.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        43      310   QSO targets, in order of QSO pair label number,
                              not RA.
table4.dat       115      996   The 690 metal-line absorption systems in the
                              spectra of the 310 QSOs


See also:
  J/AJ/126/2579 : SDSS quasar catalog. II. First data release (Schneider+, 2003)
  http://www.sdss.org : SDSS Home Page


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       Right ascension (J2000)
   4-  5  I2    min     RAm       Right ascension (J2000)
   7- 11  F5.2  s       RAs       Right ascension (J2000)
      13  A1    ---     DE-       Declination sign (J2000)
  14- 15  I2    deg     DEd       Declination (J2000)
  17- 18  I2    arcmin  DEm       Declination (J2000)
  20- 24  F5.2  arcsec  DEs       Declination (J2000)
  26- 30  F5.3  ---     zem       Emission redshift
      32  A1    ---     ---       [P]
  33- 35  I3    ---     Pair      [1,155] QSO pair number
      36  A1    ---     m_Pair    [abc] Multiplicity index for pairs/triplets
  38- 43  F6.2  arcsec  Sep       Separation between pairs


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label     Explanations

       1  A1    ---     ---       [P]
   2-  4  I3    ---     Pair      [1,155] QSO pair number
       5  A1    ---     m_Pair    [abc] Multiplicity index for pairs/triplets
   7- 13  F7.5  ---     z         Redshift (1)
  15- 78  A64   ---     Ions      Ions or zem (2)
  80-101  A22   ---     Notes     Notes and system classifications (3)
 104-108  F5.2  0.1nm   Wrest     ? Rest frame equivalent width for one of the
                                    stronger doublet lines (1548, 2796 or 1238)
                                    in order of preference
     109  A1    ---     f_Wrest   [?] ? Wrest value for CIV 1550 or NV 1242
 111-115  F5.2  0.1nm   Wpm       ? Wpm is the minimum Wrest that we could have
                                    seen for the same line in the spectrum
                                    of the partner QSO at the same z

Note (1): We give 5 decimal places for the redshifts of the coincident
     absorption systems, and 4 decimals for most other absorbers.
Note (2): # indicates significantly blended absorption line.

Note (3): Abbreviations used:
     EA = emission-absorption coincident absorbers are close to the
          emission redshift of the partner QSO, with -0.005<DzEA<0.005
    EAV = coincident absorbers (V for velocity) are like EA coincidences
          but with have vEA<1000km/s and |DzEA|>0.005
     AA = absorption-absorption) coincident systems have a partner in the
          paired QSO with -0.005<DzAA<0.005
    AAV = coincident systems (V for velocity) have vAA<1000km/s but
          |DvAA|>0.005
    AAA = associated absorber-absorber coincident systems have
          |vAA|<1000km/s and one or both absorbers at vabs<3000km/s
          from their QSO


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    24-Aug-2009