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Detailed Description of J/ApJS/107/201
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Individual files can be fetched (via http) from
here
or via ftp from: ftp://cdsarc.u-strasbg.fr/pub/cats/J/ApJS/107/201
The catalogue can be queried from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/ApJS/107/201
This standardized document follows the rules of the Standard Description for Astronomical Catalogues. For those having to work on this catalogue using FORTRAN programs, this ReadMe file can be transformed into a f77-compliant program which reads the files making up this catalogue, in two versions: either a f77 program loading whole files into arrays, or a f77-program reading each data file line by line.
J/ApJS/107/201 The Stromlo-APM Redshift Survey IV (Loveday+ 1996)
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The Stromlo-APM Redshift Survey IV: The Redshift Catalogue
Loveday J., Peterson B.A., Maddox S.J., Efstathiou G.
<Astrophys. J. Suppl. Ser. 107, 201 (1996)>
=1996ApJS..107..201L
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ADC_Keywords: Galaxy catalogs; Photometry; Redshifts
Abstract:
The Stromlo-APM Redshift Survey consists of 1797 galaxies with
b(J)<17.15 selected randomly at a rate of 1 in 20 from Automated Plate
Measurement (APM) scans. The survey covers a solid angle of 1.3sr
(4300 square degrees) in the south galactic cap. Redshifts have been
measured for 1790 (99.6%) of the galaxies. The median galaxy recession
velocity is 15,300 km/s and so the volume probed is approximately
V=1.38 million Mpc3/h3.
File Summary:
FileName Lrecl Records Explanations
× ReadMe 80 . This file
× galaxy.dat 79 1797 Galaxies in Stromlo-APM survey
× fields.dat 23 185 Field centres
× holes.dat 75 1456 Holes drilled around big bright objects
Byte-by-byte Description of file: galaxy.dat
Bytes Format Units Label Explanations
1- 11 A11 --- ID Galaxy name (1)
14- 15 I2 h RAh Right Ascension 1950 (hours)
17- 18 I2 min RAm Right Ascension 1950 (minutes)
20- 24 F5.2 s RAs Right Ascension 1950 (seconds)
27 A1 --- DE- Declination 1950 (sign)
28- 29 I2 deg DEd [17,72] Declination 1950 (degrees)
31- 32 I2 arcmin DEm Declination 1950 (arcminutes)
34- 37 F4.1 arcsec DEs Declination 1950 (arcseconds)
40- 44 F5.2 mag Bj Bj magnitude
47- 49 I3 arcsec MajDiam Major diameter
52- 54 I3 arcsec MinDiam Minor diameter
57- 59 I3 deg PA [0,360[ Position angle (degrees) (2)
63- 64 I2 --- MType Morphological type (3)
67- 71 I5 km/s RV Radial velocity (heliocentric)
74- 76 I3 km/s e_RV Error in radial velocity
78- 79 I2 --- r_RV Source of radial velocity (4)
Note (1):
Each galaxy name is composed of the survey field number and the x, y
position of the galaxy on the plate---this should ease location of any
particular galaxy on the plate material. The first 3 digits are the
SERC field number. The second set of digits are the x-position in
millimetres from the centre of the plate (actually the APM scan
centre). These are preceded by a `+' sign for galaxies to the right
(west) of the plate centre or by a `-' sign for galaxies to the left
(east) of centre. The final 3 digits are the y position, again in mm
from the plate centre. A preceding `-' indicates galaxies above
(north) of the plate centre, `+' indicates galaxies below (south) of
the centre.
Note (2):
PA is measured clockwise from south-north line.
Note (3):
The morphological type is given by mod(Mtype,10)
1 = Elliptical
2 = Lenticular
3 = Spiral
4 = Irr/Pec
5 = Uncertain
8 = Merged with star
9 = Multile galaxy
Galaxies from the ESO catalogue have 10 added, those assigned
morphological types by SJM have 20 added (all others typed by JL).
Note (4):
The RV_src flag indicates the source of the radial velocity:
-1 = unreliable
0 = not available
1 = MSSSO 2.3m, absorption features
2 = MSSSO 2.3m, emission lines
3 = MSSSO 2.3m, both absorption and emission
4 = Southern Sky Redshift Survey
5 = Dressler & Schectman 1988AJ.....95..284D
6 = Huchra's ZCAT (Cat. VII/193) compilation
Byte-by-byte Description of file: fields.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Field [53,605] SERC field number (1)
5- 10 F6.2 deg RAdeg RA of field centre 1950 (degrees)
12- 17 F6.2 deg DEdeg Dec of field centre 1950 (degrees)
19- 23 F5.3 deg RAextent RA extent of field (degrees)
Note (1): This table lists SERC field centres in 1950 decimal degrees.
The column labeled RAextent gives the half-size of the Right Ascension
of the field in degrees. The DEextent is 2.5 degrees for every field.
This list of fields may be used for example to generate a random
catalogue with the same boundaries as the survey data as follows.
A point with coordinates (RAp, DEp) is inside a field with coordinates
(RAf, DEf) if (abs(RAp - RAf) < RAextent) and (abs(DEp - DEf) <
DEextent). An additional test should be made to allow for the extra
overlap between fields at RA = 0. If RAf is not zero then abs(RAp)
must be greater than RAextent.
Byte-by-byte Description of file: holes.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Field [53,605] SERC field number (1)
5- 15 F11.7 deg HOLX1 RA of 1st corner of hole (degrees)
17- 27 F11.7 deg HOLY1 Dec of 1st corner of hole (degrees)
29- 39 F11.7 deg HOLX2 RA of 2nd corner of hole (degrees)
41- 51 F11.7 deg HOLY2 Dec of 2nd corner of hole (degrees)
53- 63 F11.7 deg HOLX3 RA of 3rd corner of hole (degrees)
65- 75 F11.7 deg HOLY3 Dec of 3rd corner of hole (degrees)
Note (1):
This table lists the coordinates of parallelogram shaped holes drilled
out around big bright objects in the survey. The following FORTRAN
code will test if a point with coordinates (xr,yr) lies in a hole.
Fortran program to use the holes.dat file:
c
c *** Set drilled = .true. if point (xr,yr) lies in a given hole
c
c Method: Express displacement vector to (xr,yr) in terms of basis
c vectors of parallelogram
c
c Vr = a1*V1 + a2*V2
c - - -
c
c Then (xr,yr) is drilled if 0 <= a1,a2 <= 1
c
c First, ensure that the RA coords are in [-180,180], since the APM
c survey straddles RA = 0.
c
if (xr.gt.180.0) xr = xr - 360.0
drilled = .false.
dx = xr - HOLX1
dy = yr - HOLY1
dx1 = HOLX2 - HOLX1
dy1 = HOLY2 - HOLY1
dx2 = HOLX3 - HOLX1
dy2 = HOLY3 - HOLY1
if (abs(dx2).gt.0) then
a1 = (dx*dy2 - dy*dx2)/(dx1*dy2 - dy1*dx2)
a2 = (dx - a1*dx1)/dx2
if (0.le.a1.and.a1.le.1.and.0.le.a2.and.a2.le.1) drilled = .true.
endif
References:
Loveday et al., Paper I. 1992ApJ...390..338L
Loveday et al., Paper II. 1995ApJ...442..457L
Loveday et al., Paper III. 1996ApJ...468....1L
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(End) Jon Loveday [Fermilab] 24-Apr-1996
