Detailed Description of J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999)

J/PASP/111/438      Updated Zwicky catalog (UZC)             (Falco+, 1999)
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The updated Zwicky catalog (UZC).
    Falco E.E., Kurtz M.J., Geller M.J., Huchra J.P., Peters J., Berlind P.,
    Mink D.J., Tokarz S.P., Elwell B.
   <Publ. Astron. Soc. Pac. 111, 438 (1999)>
   =1999PASP..111..438F
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ADC_Keywords: Galaxy catalogs ; Redshifts ; Surveys


Abstract:
    The Zwicky Catalog of galaxies (ZC), with mZw<=15.5, has been the
    basis for the Center for Astrophysics (CfA) redshift surveys. To date,
    analyses of the ZC and redshift surveys based on it have relied on
    heterogeneous sets of galaxy coordinates and redshifts. Here we
    correct some of the inadequacies of previous catalogs by providing (1)
    coordinates with ~<2" errors for all of the 19,369 catalog galaxies,
    (2) homogeneously estimated redshifts for the majority (98%) of the
    data taken at the CfA (14,632 spectra), and (3) an estimate of the
    remaining "blunder" rate for both the CfA redshifts and for those
    compiled from the literature. For the reanalyzed CfA data we include a
    calibrated, uniformly determined error and an indication of the
    presence of emission lines in each spectrum. We provide redshifts for
    7257 galaxies in the CfA2 redshift survey not previously published;
    for another 5625 CfA redshifts we list the remeasured or uniformly
    rereduced value. Among our new measurements, 1807 are members of UZC
    "multiplets" associated with the original Zwicky catalog position in
    the coordinate range where the catalog is 98% complete.

File Summary:

       FileName      Lrecl  Records   Explanations

×                   80        .   This file
× ReadMe            80        .   This file
× catalog.dat       72    19367   UZC catalog (table 1)
× refs.dat         123      325   Velocity sources for the UZC (table 2)


See also:
    VII/190 : Zwicky Galaxy Catalog (Zwicky+ 1968)
    VII/193 : The CfA Redshift Catalogue, Version June 1995 (Huchra+ 1995)


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

   Bytes Format Units   Label    Explanations

   1-  2  I2    h       RAh      Right ascension (J2000)
   3-  4  I2    min     RAm      Right ascension (J2000)
   5-  8  F4.1  s       RAs      Right ascension (J2000)
       9  A1    ---     DE-      Declination sign (J2000)
  10- 11  I2    deg     DEd      Declination (J2000)
  12- 13  I2    arcmin  DEm      Declination (J2000)
  14- 15  I2    arcsec  DEs      Declination (J2000)
  17- 20  F4.1  mag     Bmag     B magnitude (Zwicky magnitude)
  22- 26  I5    km/s    cz       ? Heliocentric redshift
  28- 30  I3    km/s    e_cz     ? rms uncertainty on cz
      32  A1    ---     T        [ABE] Spectral characteristics (1)
      34  I1    ---     U        [0/4] UZC class 0-4 (2)
      36  I1    ---     N        Number of UZC neighboring galaxies, within 3'
  38- 49  A12   ---     Zname    Zwicky label based on 1950 positions
      51  A1    ---     f_cz     [FMTXZ] Origin of the redshift measurement (3)
  53- 56  I4    ---     r_cz     ? Reference code detailed in file refs.dat
                                   (blank for CfA unpublished data)
  58- 68  A11   ---     Name     Other name
      70  A1    ---     UZC      [*] UZC multiplicity, * if multiple
      72  A1    ---     mul      [PTG] NED multiplicity: Pair, Triple, Group

Note (1): the symbol means:
    A: absorption
    E: emission
    B: both emission and absorption
Note (2): the UZC class is defined as:

   0: a "hit", where the GSC and Zwicky objects are separated in position
      by less than 180", are comparable in brightness as determined
      visually, and there is no other object within the field that could
      be a Zwicky galaxy.

   1: a "hit" with positional difference less than 180", again with a GSC
      brightness in the vicinity of the Zwicky value. However, the field is
      centered on a GSC "star" rather than on a "nonstar", but there is only
      one possible Zwicky galaxy nearby, within the field. Thus, index 1
      merely indicated that the nearest GSC object to the Zwicky coordinates
      is a star rather than the appropriate galaxy.

   2: a near "hit" with positional difference less than 180". However,
      there is confusion because there are at least two galaxies with an
      estimated spread in magnitudes |{Delta}m| within the expected range,
      either of which could be a Zwicky galaxy.

   3: A near "hit" with positional difference less than 180", but with
      |{Delta}m| outside the expected range, raising suspicions about the
      match of the GSC object to the Zwicky galaxy.

   4: No "hit" at all for a positional difference less than 180", i.e.,
      there is no match for a Zwicky galaxy.
Note (3): Code for the origin of the redshift measurement taken at the CfA:
   Z for Z-machine,
   M for the MMT (4.5m Multiple Mirror Telescope)
   F for FAST spectra taken from our own and from other projects
   X flags a low-S/N spectrum for Z-machine (FAST) measurements and
     indicates a low S/N match with a spectrum at cz<100km/s.


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

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     Ref       Reference number
   6- 24  A19   ---     BibCode   BibCode
  27- 54  A28   ---     Aut       Author names
  56-123  A68   ---     Rem       Remarks


History: Copied at http://cfa-www.harvard.edu/~falco/UZC
  * 30-Jul-2002: slightly modified version copied from
    http://cfa-www.harvard.edu/~falco/UZC (5 duplicates removed)
    and added the references from Huchra's Zcat (VII/193)
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(End)      Francois Ochsenbein, James Marcout, Patricia Bauer [CDS]  27-May-1999