II/174 IRAS 2Jy Redshift Survey Data File (Strauss+ 1992)
IRAS 2Jy redshift survey data file
Strauss M., Davis M., Yahil A., Huchra J.P.
<Astrophys. J. Suppl. Ser. 83, 29 (1992)>
=1992ApJS...83...29S 1992ApJS...83...29S
=1992yCat.2174....0S 1992yCat.2174....0S
ADC_Keywords: Infrared sources ; Galaxies, IR
Keywords: galaxies; distances and redshifts ; infrared: galaxies ; surveys
Abstract:
We present the data for a redshift survey of galaxies selected from
the database of the Infrared Astronomical Satellite (IRAS). The sample
is flux limited to 1.936 Jy at 60 microns and covers 11.01 sr of the
sky. It consists of 5014 objects, of which 2658 are galaxies. The
remaining 2356 sources are listed in a separate table with
identifications. Redshift data are also given for 212 IRAS galaxies
which are not part of the complete sample, but were measured in
conjunction with this project.
Description:
The survey contains 5014 objects selected from the IRAS database
according to the criteria listed in the paper, briefly:
* F60 > 1.936Jy;
* F602 > F12.F25;
* |b| < 5°
* high source density flag at 60µm not raised.
Thus, the file consists of both galaxies and Galaxian contaminants;
this is explained below. It includes 2658 galaxies.
The file 2jy.lis may be read with the following read statement:
read (1,'(2i2,f4.1,a1,3i2,x,4i4,x,2i1,3a1,4i1,a12,f5.2,x,i5,i3,
& a4,a5,x,i6,f5.2,a6,x,a20,4i4)')
& hour, raminute, rasecond, decsign, decdegree, decminute,
& decsecond, nf12, nf25, nf60, nf100, idtype, extendflag, CC,
& varflag, statusflag, fq12, fq25, fq60, fq100, optid, mag,
& vel, velerr, source, ttype, unumber, bt, spectrum, comments,
& pf12, pf25, pf60, pf100
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
2jy.dat 132 5014 Main list
exclude.f 74 281 Fortran program
exclude.lis 6 1465 Numbers of the lune bins that are excluded
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Description of file: 2jy.lis
See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
VII/109 : IRAS Observations of Large Optical Galaxies (Rice+, 1988)
VII/193 : The CfA Redshift Catalogue, Version June 1995 (Huchra+ 1995)
Byte-by-byte Description of file: 2jy.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RA.h B1950 RA hour (1)
3- 4 I2 min RA.m B1950 RA minute (1)
5- 8 F4.1 s RA.s B1950 RA second (1)
9 A1 --- DE.- B1950 Declination sign (1)
10- 11 I2 deg DE.d B1950 Declination degree (1)
12- 13 I2 arcmin DE.m B1950 Declination minute (1)
14- 15 I2 arcsec DE.s B1950 Declination second (1)
17- 20 I4 10-3[dJy] nf12 Compact 12µm flux (2)
21- 24 I4 10-3[dJy] nf25 Compact 25µm flux (2)
25- 28 I4 10-3[dJy] nf60 Compact 60µm flux (2)
29- 32 I4 10-3[dJy] nf100 Compact 100µm flux (2)
34 I1 --- id [0/4] IRAS-PSC association type (idtype) (9)
35 I1 --- x [0/8] Extended source (extendflag) (3)
36 A1 --- CC [A-L] Correlation from IRAS-PSC (4)
37 A1 --- v [0-9Vnv] IRAS variability flag (varflag) (5)
38 A1 --- s Type of source (statusflag) (6)
39 I1 --- q_nf12 [1/3]? Quality of F12, 3=good (fq12) (7)
40 I1 --- q_nf25 [1/3]? Quality of F25, 3=good (fq25) (7)
41 I1 --- q_nf60 [1/3]? Quality of F60, 3=good (fq60) (7)
42 I1 --- q_nf100 [1/3]? Quality of F100, 3=good (fq100) (7)
43- 54 A12 --- OptID Optical name of the source (optid) (8)
55- 59 F5.2 mag mag ? Optical magnitude (8)
61- 65 I5 km/s Vel ? Heliocentric redshift,
from literature or measured by us (vel)
66- 68 I3 km/s e_Vel ? Error on Vel (velerr)
69- 72 A4 --- r_Vel Redshift source from ZCAT (VII/193) (source)
73- 77 A5 --- TType type of the galaxy from ZCAT (VII/193) (ttype)
79- 84 A6 --- Gal UGC or ESO number of the source (unumber)
85- 89 F5.2 mag BTmag ? total magnitude, as defined in the RC2 (bt)
90- 95 A6 --- Sp Internal index for the optical spectrum in
the CfA database (spectrum)
97-116 A20 --- Comm Comments from ZCAT (see VII/193) (comments)
117-120 I4 10-3[dJy] pf12 ? Compact IRAS-PSC 12µm flux (2)
121-124 I4 10-3[dJy] pf25 ? Compact IRAS-PSC 25µm flux (2)
125-128 I4 10-3[dJy] pf60 ? Compact IRAS-PSC 60µm flux (2)
129-132 I4 10-3[dJy] pf100 ? Compact IRAS-PSC 100µm flux (2)
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Note (1): The coordinates for all objects that appear in the IRAS-PSC
Version 2 (II/125), 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,
Cat. VII/109)
Note (2): The IRAS fluxes are coded in a compact logarithmic form:
nFx = 1000*log(10Fx), or Fx=10(nFx/1000-1) for x=12, 25, 60, 100.
The fluxes are taken from the PSC, unless:
* The object is extended at 60 microns (see extendflag below);
* The object is variable (see varflag below);
* The object is of moderate flux quality at 60 microns (see Fq60 below).
In these cases, we have obtained one-dimensional addscan's of the data and
used the zero-crossing flux from the median scan's in all four bands, as
supplied by SCANPI. Those sources flagged as extended in Rice et al.
(cat. VII/109) have fluxes from that source.
Note (3): The extendflag indicates whether or not an object is flagged as
extended (SES(2) flag) in the psc. Values are:
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 (VII/109)
Note (4): 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 60µm in the Point Source Data Base;
see the Explanatory Supplement for details. A means 99% or better
correlation, B is between 98 and 99% and so on.
Note (5): The varflag 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%
...
Note (6): 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 (Cat. VII/185) and
Yahil et al. (1991ApJ...372..380Y 1991ApJ...372..380Y) for a discussion of our estimate of the
number of sources flagged as cirrus that are indeed galaxies.
Note (7): The flux qualities are taken from the PSC; one number between one
and three is given for each band:
1 = Not detected
2 = Moderate flux quality
3 = Good flux quality
If the flux given is from the PSC (as opposed to ADDSCAN), the flux
listed in a band with flux quality 1 will be an upper limit.
Note (8): Optical identification is from a matching of the combined UGC,
Zwicky, and NGC catalogs, and is not complete. We will improve this in
the near future. Occasionally, these columns will contain obvious
junk, which should be ignored. Magnitudes are from the same source.
Note (9): The idtype is taken directly from the PSC; it ranges from 1 to 4:
1 = association found in an extragalactic catalogs
2 = association found in stellar catalogs
3 = association found in other catalogs
4 = association found in multiple types of catalogs
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History:
The file (2jy.lis) was originally prepared by Michael Strauss.
(End) Francois Ochsenbein [CDS] 29-May-2015