IRASPSCZ - IRAS Point Source Catalog Redshift (PSCz) Catalog

Overview

The IRAS Point Source Catalog Redshift (PSCz) Survey consists of redshifts, infrared and optical photometry, and assorted other information for 18351 IRAS sources, mostly selected from the Point Source Catalog. The survey was designed to select almost all galaxies with flux brighter than 0.595 Jy at 60 microns (µm), over the 84% of the sky with extinction small enough that reliable and complete optical identification and spectroscopy was possible. Some of the sources are not galaxies and some are multiple entries for the same galaxy as described in the reference paper. There are in total 15,411 galaxies or possible galaxies, for which redshifts are available for 14,677. The galaxies without redshift are mostly distant or at low latitude, as described in the paper. Many of these galaxies have now been observed as part of the BTP project (Saunders et al 1999, astro-ph/9909174 "The Behind the Plane Survey"), and their redshifts were to be included in future revisions of this catalog.

The full catalog for the PSCz Catalog contains more than 120 parameters and is available at the CDS in the directory http://cdsarc.u-strasbg.fr/ftp/cats/VII/221/ as the files pscz.dat (18,351 sources in the main catalog) and psczcg.dat (60 additional sources close to the coverage gap). There is also a 'short' version of the catalog, psczvs.dat and psczcgvs.dat, containing 19 parameters, sufficient information for most studies. They correspond to the version 2.2.

Many fields are taken directly from the IRAS Point Source Catalogue (CDS Cat. II/125). See the IRAS Explanatory Supplement (Beichman et al., 1988, NASAR, 1190, 1) for more information. If there are problems that cannot be resolved by careful reading of these notes or the accompanying paper, please contact Will Saunders <will@roe.ac.uk> or Will Sutherland <W.Sutherland1@physics.ox.ac.uk>.

Catalog Bibcode

2000MNRAS.317...55S

References

The PSCz catalogue
    Saunders W., Sutherland W.J., Maddox S.J., Keeble O., Oliver S.J.,
    Rowan-Robinson M., McMahon R.G., Efstathiou G.P., Tadros H., White S.D.M.,
    Frenk C.S., Carraminana A., Hawkins M.R.S.
    <Mon. Not. R. Astron. Soc. 317, 55 (2000)>
    =2000MNRAS.317...55S

Provenance

This table was created by the HEASARC in February 2014 based on CDS Catalog VII/221 files psczvs.dat (the 'Main' sample) and psczcgvs.dat (the 'Near-gap' sample), comprising the 'Short' version of the PSCz Catalog.

HEASARC Implementation

This HEASARC table is based on the 'short' version of the PSCz Catalog. The HEASARC has removed the 60 sources near the coverage gap in the input file psczcg.dat which were erroneously included in this file as well as in the input file psczcgvs.dat before ingesting them into this table, so that the total number of sources (18,351 + 60 = 18,411) now matches the number of sources (18,411) in the full PSCz Catalog. The HEASARC has changed some data values its version compared to the input table: (i) in the original table the names were of the form 'A/123/456': the HEASARC has changed these by adding the 'PSCz' prefix and changing the slashes to dashes, e.g., 'PSCz A-123-456'. Note that neither of these formats conform to the edicts of the Dictionary of Nomenclature of Celestial Objects or are recognized by the SIMBAD name resolver; (ii) if for a given source, the values of the radial velocity, its error and the corresponding reference code are all zero, the HEASARC has nullified all 3 values.

Parameters

Source_Sample
This field indicates from which CDS table/sample the entry originates: 'Main' if it comes from the main table psczvs.dat, or 'Near-gap' if it comes from the table of 60 sources near the coverage gap, psczcgvs.dat.

Name
The source designation for these sources, called 'CPNAME' in the CDS documentation. In the original CDS table, the names were of the form 'A/123/456': the HEASARC has changed these by adding the 'PSCz' prefix and changing the slashes to dashes, e.g., 'PSCz A-123-456'. Note that neither of these formats conform to the edicts of the Dictionary of Nomenclature of Celestial Objects or are recognized by the SIMBAD name resolver. If the source has a non-blank alternative designation (the alt_name parameter), it should always be referred to by that name.

Alt_Name
An alternative optically-derived designation for the source.

Source_Type
The source category flag, called 'CPSCZ' in the CDS documentation, coded as follows:

  Value         Meaning

  =    PSC (or PSC reject file) source, and not a large-diameter optical galaxy.
  +    addscanned large optical galaxy added to PSCz.
  -    PSC source associated with a "+" addscan object (normally excluded).
  &    high latitude PSCz source, but in a bin excluded by psczmask.dat.
  ^    high latitude optical galaxy, in a bin excluded by psczmask.dat.

Redshift_Status
The redshift status flag, called 'CZSTAT' in the CDS documentation, coded as follows:

  Value         Meaning

  1      PSCz redshift, excellent quality.
  2      PSCz redshift, good quality.
  3      PSCz redshift, low s/n but secure.
  4      PSCz redshift, marginal detection, unreliable.
  l      literature redshift, see r_Hvel for details.
  p      private communication, see r_Hvel for details.
  q      redshift from QDOT (J/MNRAS/308/897) or QCCOD.
  x      Give up, too optically faint (B or b_J > 19.5 mag).
  -      Don't need it: galactic source, duplicate, part of larger galaxy etc.

Optical_Class_Code
The classification flag value for the source based on optical data, etc., and called 'CLASS' in the CDS documentation, coded as follows:

  Value         Meaning

    g :    galaxy or galaxies
   gf:     faint galaxy, B or b_j > 19.5 mag.
   go:     optical galaxy with 1D addscanned flux
   gr:     Rice et al. (1988, ApJS, 68, 91) galaxy with 2D coadded photometry
   ss:     star, confirmed spectroscopically (by us, 1.2 Jansky or de Grijp)
   bs:     bright star from plate or telescope TV, no spectrum
   is:     star from IRAS colors and plate/TV appearance
   c :     cirrus
   pn:     planetary nebula
   rn:     reflection nebula
   h2:     HII region
   zz:     other galactic source
   lm:     in Large Magellanic Cloud
   sm:     in Small Magellanic Cloud
   vb:     visually blank on sky survey plates, no non-stellar id
   kb:     K' image blank, no non-stellar id
   rb:     radio blank, no 6 or 20cm id
   de:     delete from catalogue, part of extended galaxy
   d1:     delete from catalogue, broken up 1HCON source already listed elsewhere
   du:     deleted optical galaxy, part of multiple system unresolved by IRAS
   dr:     deleted optical galaxy, already in as Rice et al. (1988, ApJS, 68, 91) galaxy
   ao:     PSC source associated with addscanned optical galaxy
   ar:     PSC source associated with Rice et al. (1988, ApJS, 68, 91) optical galaxy

The divisions above between Galactic classifications 'pn','rn' etc are not rigorous. The 'go' and 'gr' sources were optically selected (see reference paper) and their IRAS fluxes determined by addscanning or coadding. Their fluxes (F12 to F100) are addscan or coadded fluxes, reduced by a factor 1.1 to bring them statistically into line with PSC fluxes. Where the resulting flux 60-um flux is 0.6 Jy or greater, they are added to the catalogue and flagged with source_type (CPSCZ) = '+'. There are 1467 such sources representing 1402 individual galaxies resolved by IRAS. The associated PSC source is retained in the catalog, but is flagged as CPSCZ='-' and will normally be excluded (1290 sources).

RA
The Right Ascension of the source in the selected equinox. The positions were given in B1950.0 equatorial coordinates to a precision of 0.1 seconds of time in the input files.

Dec
The Declination of the source in the selected equinox. The positions were given in B1950.0 equatorial coordinates to a precision of 1 arcsecond in the input files.

LII
The Galactic Longitude of the source.

BII
The Galactic Latitude of the source.

Flux_60um
The flux of the source at 60 um, in Jansky (Jy).

Radial_Velocity
The best available heliocentric velocity of the source, cz, in km/s.

Radial_Velocity_Error
The uncertainty in the heliocentric velocity of the source, in km/s.

Ref_Radial_Velocity
The coded reference for the source of the heliocentric velocity, where negative values are from PSCz or are private communications):

  Value     Meaning

   -99      INT/FOS or AAT/FORS
   -98      NOT
   -97      CTIO 60"
   -96      Fairall for PSCz
   -95      Nancay measurements for PSCz
   -94      AAT service data
   -93      INT/IDS500
   -92      Cananea
   -91      Parkes
   -90      WHT/FOSII
   -32      Juraszek
   -31      Visnanathan
   -30      Kraan-Kortweg
   -29      Lu, Pantoja
   -28      Nancay
   -27      Chamaraux, Yamada, Takata, Nakanishi
   -25      WHT Ultraluminous
   -24      QCCOD pole extension
   -23      QCCOD
   -21      Giovanelli + Haynes
   -20      DaCosta
   -10 - 70 as in Huchra 1991, See CDS Cat. <VII/193>
    83      QDOT, Lawrence et al., CDS Cat. <J/MNRAS/308/897>
    84      Leech et al., 1988MNRAS.231..977L
    85      NED, see http://nedwww.ipac.caltech.edu/
    86      PGC (CDS Cat. <VII/119>), LEDA
    87      1.2Jy, CDS Cat. <VII/185>
    88      Allen et al., 1990ApJ...355..130A
    89      Seeberger
    90      RC3 HI, CDS Cat. <VII/155>
    91      RC3 optical, CDS Cat. <VII/155>
    92      Fairall
    97      Tully 1987ApJ...321..280T
    98      Lonsdale and Hacking 1989ApJ...339..712L,
            Lonsdale 1986 (see Eales et al., 1988ApJ...328..530E)

Lune_Bin_100_um_Bck
The 100-um background, in mJy sr^-1, taken from Rowan-Robinson et al. (1991, MNRAS, 249, 729) called 'I100B' in the CDS documentation. This is averaged over the 1-square degree 'lune bin' (see App. X.1 of the IRAS Explanatory Supplement, Beichman et al., 1988, NASAR, 1190, 1 for more details) in which the source resides, and is corrected for all IGAL sources.

Lune_Bin_Bmag_Extinction
The estimated average B extinction, in magnitudes, based on the 100-um background, for that lune bin in which the source resides. This has been crudely corrected for the temperature variation of dust across the galaxy

Hex_HSD_Flag
The high source density flag, encoded as a hexadecimal. See App. X.1 of the IRAS Explanatory Supplement, (Beichman et al., 1988, NASAR, 1190, 1) for more details.

Number_Hcon_Coverages
This parameter called 'MHCONB' in the CDS documentation, is the number of HCONs (hours-confirming coverages) for the lune bin in which the source resides. This is crudely estimated from Figure I.C.1 of the IRAS Explanatory Supplement, (ES: Beichman et al., 1988, NASAR, 1190, 1). Sources needed at least 2 HCON detections to enter the IRAS PSC. The estimated completeness at 0.6 - 0.65 Jy in 2-HCON area is only 82% according to Section XII.A.4 of the ES. A value of 3 indicates 3 or more HCONs for the lune bin.

Ratio_100_To_60_um_Flux
The ratio of the 100-um to 60-um flux for the source, where a negative value means there was only an upper limit for the source flux at 100-um.

Lune_Bin_Number
The number of the lune bin in which the source resides.

Class
The HEASARC Browse object classification, based the value of the optical_class_code parameter.

Contact Person

Questions regarding the IRASPSCZ database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:29:37 EDT