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IRASZSURV: Help

IRASZSURV - IRAS 1.2-Jy Redshift Survey


Overview

This is The Redshift Survey of Fisher, Huchra, Strauss, Davis, Yahil and Schlegel; the data set is described in full in ApJ 361, 49 (1990). The data for the brighter half are included in ApJ Supp 1992, 83, 29; the data for the fainter half are included in ApJ Supp 1995, 100, 69. The survey contains 9897 objects selected from the IRAS database according to the following criteria:
               F60   > 1.2 Jy;
               F60^2 > F12 f25;
               |b| < 5;
               high source density flag at 60 microns not raised.
Thus, this database consists of both galaxies and Galaxian contaminants. The sample contains ~5320 galaxies, and 14 objects without identifications at the present time.

Catalog Bibcode

1990ApJ...361...49S

References

Strauss M., Davis M., Yahil A., Huchra J.P.; Astrophys. J. 361, 49 (1990)

Strauss M., Huchra J.P., Davis M., Yahil A., Fisher K.B., Tonry J.; Astrophys. J. Suppl. 83, 29 (1992)

Fisher K.B., Huchra J.P., Strauss M.A., Davis M., Yahil A., Schlegel D.; Astrophys. J. Suppl., 100, 69 (1995)


Parameters

Name
For the names we have used the optical identifications made from a matching of the combined UGC, Zwicky, and NGC Catalogs.

RA
The Right Ascension of the object.

The coordinates for all objects that appear in the IRAS PSC, Version 2, are from that source, and are given as B1950.0; there are also a few very large galaxies whose fluxes and coordinates are taken from the Large Optical Galaxy Catalog (Rice et al. 1988, ApJS, 68, 91).

Dec
The Declination of the object.

The coordinates for all objects that appear in the IRAS PSC, Version 2, are from that source, and are given as B1950.0; there are also a few very large galaxies whose fluxes and coordinates are taken from the Large Optical Galaxy Catalog (Rice et al. 1988, ApJS, 68, 91).

LII
The galactic longitude of the object.

BII
The galactic latitude of the object.

Micron_Flux_12
Log 10 of 12 um flux in 0.1 Jy

Micron_Flux_25
Log 10 of 25 um flux in 0.1 Jy

Micron_Flux_60
Log 10 of 60 um flux in 0.1 Jy

Micron_Flux_100
Log 10 of 100 um flux in 0.1 Jy

Psc_ID
The PSC Id field is taken directly from the PSC; PSC Id ranges from 1 to 4 and states whether an association was found is an extragalactic catalog (1), stellar catalogs (2), other catalogs (3), or matches in multiple types of catalogs (4).

Extend_Flag
The extend flag indicates whether or not an object is flagged as extended (SES(2) flag) in the PSC.

  	0  Not Extended
  	1  Extended at 12 microns
  	2  Extended at 25 microns
  	3  Extended at 12 and 25 microns
  	4  Extended at 60 microns
  	5  Extended at 12 and 60 microns
  	6  Extended at 25 and 60 microns
  	7  Extended at 12, 25, and 60 microns
  	8  Extended in Rice et al
  

Cirrus_Flag
The correlation coefficient is taken from the PSC and represents the best correlation coefficient between a hours-confirmed scan and the point source template at 60 microns in the Point Source Data Base; further information is available from the HEASARC. A means 99% or better correlation, B is between 98 and 99% and so on.

Var_Flag
The Var Flag is a measure of variability in 12 and 25 microns.

   *  n  No measure of variability available.
   *  0  No variability measured.
   *  N  Variability between 1 and 10%.
   *  1  Variability between 10 and 20% and so on.
  

Obj_Id_Flag
The statusflag indicates the identification of the source, and, if it is a galaxy, the source of the redshift:

Galaxies:

   * O,H,Z,F,B,D.  The distinction between these is uninteresting,
                   although Z indicates a source drawn from John
                   Huchra's private version of ZCAT.
   * L:  Local Group galaxy.  This is given a separate flag.
  
Non-galaxies:
   * M:  HII region in external galaxy.
   * S:  Star
   * s:  Emission line star
   * C:  Cirrus or dark cloud
   * P:  Planetary nebula
   * R:  Reflection Nebula
   * ? or E:  Unidentified field.
  
These labels are by no means complete; we observed only a fraction of these sources at the telescope. See Strauss et al. 1990 and Yahil et al. 1991 (ApJ, 372, 380) for a discussion of our estimate of the number of sources flagged as cirrus that are indeed galaxies.

Micron_Flux_12_Flag
IRAS PSC Flux quality flag at 12 um

Micron_Flux_25_Flag
IRAS PSC Flux quality flag at 25 um

Micron_Flux_60_Flag
IRAS PSC Flux quality flag at 60 um

Micron_Flux_100_Flag
IRAS PSC Flux quality flag at 100 um

UGC_Or_Eso_Number
Either the UGC or ESO number of the source.

Opt_Mag
Magnitudes are from the combined UGC, Zwicky, and NGC catalogs, and are not complete.

Helio_Velocity
Redshifts are either as quoted in the literature, or measured by the authors. All are heliocentric.

Helio_Velocity_Error
Redshift errors are either as quoted in the literature, or measured by the authors. All are heliocentric.

Source
Source is a four-digit number that codes the redshift source from ZCAT.

T_Type
T Type is the type of the galaxy, from ZCAT.

Spectrum_Flag
Spectrum Flag is an internal index for the optical specturm, if one exists, of the galaxy in the CfA database.

Comments
Comments are taken from ZCAT.

Class
BROWSE classification type. The classification is based on the `Type` parameter, if one is available.


Contact Person

Questions regarding the IRASZSURV database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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