ADC/CDS Standard Document for Catalog:/journal_tables/ApJS/107/201/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
J/ApJS/107/201 The Stromlo-APM Redshift Survey IV (Loveday+ 1996)
================================================================================
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
================================================================================
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 Mpc^3/h^3.
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
================================================================================
(End) Jon Loveday [Fermilab] 24-Apr-1996