VII/185 IRAS 1.2 Jy IRAS Redshift Survey (Strauss+ 1990-1995)
IRAS 1.2 Jy Redshift Survey Data File
Strauss M., Davis M., Yahil A., Huchra J.P.
<Astrophys. J. 361, 49 (1990)>
=1990ApJ...361...49S 1990ApJ...361...49S
Strauss M., Huchra J.P., Davis M., Yahil A., Fisher K.B., Tonry J.
<Astrophys. J. Suppl. 83, 29 (1992)>
=1992ApJS...83...29S 1992ApJS...83...29S
Fisher K.B., Huchra J.P., Strauss M.A., Davis M., Yahil A., Schlegel D.
<Astrophys. J. Suppl. 100, 69 (1995)>
=1995ApJS..100...69F 1995ApJS..100...69F
=1995yCat.7185....0S 1995yCat.7185....0S
ADC_Keywords: Infrared sources ; Photometry, infrared ; Redshifts
Description:
This is an explanation of 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 a
paper submitted for publication to the Astrophysical Journal
Supplement. The survey contains 9897 objects selected from the IRAS
database according to the criteria listed in that paper, briefly:
F60 > 1.2 Jy;
F602 > F12 f25;
|b| > 5;
high source density flag at 60 microns not raised.
Thus, the file consists of both galaxies and Galaxian contaminants;
this is explained below. The sample contains ∼5320 galaxies, and 14
objects without id's at the present time.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 132 9897 The data file
exclude.lis 6 1465 Numbers of the lune bins that are excluded
exclude.f 80 281 Fortran program to define excluded regions
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
II/174 : IRAS 2Jy Redshift Survey Data File (Strauss+ 1992)
Byte-by-Byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension B1950 (hours) (1)
3- 4 I2 min RAm Right Ascension B1950 (minutes) (1)
5- 8 F4.1 s RAs Right Ascension B1950 (seconds) (1)
9 A1 --- DE- Declination B1950 (sign) (1)
10- 11 I2 deg DEd Declination B1950 (degrees) (1)
12- 13 I2 arcmin DEm Declination B1950 (minutes) (1)
14- 15 I2 arcsec DEs Declination B1950 (seconds) (1)
17- 20 I4 10-3[dJy] nf12 ? 12µm flux (2)
21- 24 I4 10-3[dJy] nf25 ? 25µm flux (2)
25- 28 I4 10-3[dJy] nf60 ? 60µm flux (2)
29- 32 I4 10-3[dJy] nf100 ? 100µm flux (2)
34 I1 --- id [0/4] IRAS-PSC association type (9)
35 I1 --- x [0/8] IRAS-PSC extended object flag (3)
36 A1 --- CC [A-L] IRAS-PSC correlation (4)
37 A1 --- v [0-9Vnv] IRAS-PSC variability flag (5)
38 A1 --- s Type of source (statusflag) (6)
39 I1 --- q_nf12 [1/3]? IRAS flux quality flag 12um (7)
40 I1 --- q_nf25 [1/3]? IRAS flux quality flag 25um (7)
41 I1 --- q_nf60 [1/3]? IRAS flux quality flag 60um (7)
42 I1 --- q_nf100 [1/3]? IRAS flux quality flag 100um (7)
43- 53 A11 --- optID Optical counterpart name to the object (8)
54 A1 --- n_optID [M] Unexplained note on optID
55- 59 F5.2 mag mag ? Optical magnitude, where available
61- 65 I5 km/s Hvel ? Heliocentric velocity, from literature
(see (VII/193)) or measured by us
66- 68 I3 km/s e_Hvel ? Heliocentric velocity error
69- 72 A4 --- r_Hvel Code for source of redshift in ZCAT (VII/193)
73- 77 A5 --- Ttype de Vaucouleurs' T-type from ZCAT (VII/193)
79- 84 A6 --- UGC/ESO Object ID from UGC or ESO catalog
90- 95 A6 --- Sp Internal flag coding the optical spectrum
in the CfA database
97-116 A20 --- Comm Miscellaneous comments from ZCAT (VII/193)
117-120 I4 10-3[dJy] pf12 ? IRAS-PSC 12µm flux (2)
121-124 I4 10-3[dJy] pf25 ? IRAS-PSC 25µm flux (2)
125-128 I4 10-3[dJy] pf60 ? IRAS-PSC 60µm flux (2)
129-132 I4 10-3[dJy] pf100 ? 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 the Note (3) below)
* The object is variable (see the Note (5) below)
* The object is of moderate flux quality at 60 microns (see q_nf60)
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.
(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 IRAS-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%
2 = Variability between 20 and 30%
3 = Variability between 30 and 40%
4 = Variability between 40 and 50%
5 = Variability between 50 and 60%
6 = Variability between 60 and 70%
7 = Variability between 70 and 80%
8 = Variability between 80 and 90%
9 = Variability between 90 and 100%
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 indicates a Local Group galaxy.
* 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.
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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Remark:
There is a supplementary file, exclude.lis which contains the number of
the lune bins that are excluded (see Paper 1 for a full description).
There is a series of Fortran programs in exclude.f that should be used
to decide if a given object is in the excluded regions or not. First,
run the program write_lmask, which reads the exclude.lis file and creates
a binary file lmask.lis, which has much faster I/O. This only need be
done once. Your code will need to call init_lmask to read in lmask.lis,
and thereafter zones or not.
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People may contact Michael Strauss at
if they have questions about these files.
History:
* 1995-02-06: Files prepared by Michael Strauss
* 1997-10-10: MCG and PK numbers which were truncated in the original
catalogue file have been replaced at CDS (Francois Ochsenbein)
* 2015-12-11: cosmetic changes at CDS
(End) Michael Strauss [IAS] 1995-02-06