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VII/142 Southern Redshifts Catalogue (Fairall+, 1991)
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Southern Redshifts Catalogue and Plots
Fairall A.P., Jones A.
<Publ. Dept. Astron., U. Cape Town No. 11 (1991)>
=1991srcp.book.....F
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ADC_Keywords: Galaxies, optical; Redshifts
Abstract:
This catalogue provides a "best-estimate" of the heliocentric radial
velocities of some 13000 galaxies south of Declination 0 degrees. It is
based on over 17000 redshift measurements, from over 200 sources, either
published or otherwise made public. Aside from redshift references, each
entry includes flags as to whether the velocity is from optical or radio
observations, or both, as well as an indication of the nature of any
optical emission lines. Galaxies with velocities beyond 75000 km/s are
not included. All entries have been made interactivly, by one person
(A.P.F.). The interaction was necessary because different investigators
may use different names, quote slightly different positions, and obtain
slightly different velocities for the same galaxy. Thus duplicate
entries for the same galaxy are avoided (although a few may inevitably
be included).
Introduction:
Previous Versions of this Work:
1981 Catalogue "A Simple Source Catalogue of Galaxies south of
Declination -17.5 degrees that have been observed spectroscopically"
P.J.K. Dobbie and A.P. Fairall, Publ. Dept. Astr. Univ. Cape Town, No.
4.
1983 Catalogue "A Catalogue of Galaxies south of Declination -30 degrees
that have been observed spectroscopically" A.P. Fairall, L. Lowe and
P.J.K. Dobbie, Publ. Dept. Astr. Univ. Cape Town, No. 5.
1983 Plots "The Spatial Distribution of Galaxies in the Southern Sky" H.
Winkler, Mon. Not. Astr. Soc. Sthn. Africa, 42, 74. "The Spatial
Distribution of Galaxies in the Southern Sky" A.P. Fairall and H.
Winkler in "Clusters and Groups of Galaxies", p. 23. F. Mardirossian
et al. (Eds.) Reidel, 1984.
1984 Plots "A Southern Redshift Survey - Redshift-Space Distributions of
Normal and Active Galaxies South of Declination -30 degrees" A.P.
Fairall, Publ. Dept. Astr. Univ. Cape Town, No. 6.
1985 Catalogue "A Catalogue of Galaxies South of Declination -30 degrees
that have been observed spectroscopically (1985 Version)" A.P.
Fairall, Publ. Dept. Astr. Univ. Cape Town, No. 7. Machine-Readable
Version by Anne C. Raugh (March 1987) distributed by the Astronomical
Data Center, NASA Goddard Space Flight Center.
1988 Catalogue and Plots "Southern Redshifts - Catalogue and plots" A.P.
Fairall and A. Jones, Publ. Dept. Astr. Univ. Cape Town, No. 10.
Machine-Readable Version by Anne C. Raugh (January 1989) distributed
by the Astronomical Data Center, NASA Goddard Space Flight Center.
1990 Plots "Large-Scale Structure in the Universe: Plots from the
Updated Catalogue of Radial Velocities of Galaxies and the Southern
Redshift Catalogue" A.P. Fairall, G.G.C. Palumbo, G. Vettolani, G.
Kauffmann, A. Jones and G. Baiesi-Pillastrini, Mon. Not. R. astr.
Soc., 247, 21P.
Coverage and Completeness:
This catalogue was first published in 1981. The present work is an
update and extension of the 4th version, completed in January 1988.
Since that version, the northern Declination limit has been shifted from
-17.5 degrees to the equator, and radio velocities have been included.
The new version, including updated references, has just over double the
number of galaxies in the previous version. Whilst most of the
references are original source papers, the catalogue was founded on the
de Vaucouleurs Second Reference Catalogue (Ref 001) to take care of
references prior to 1975. In similar fashion, the HI database of
Bottinelli et al (Ref 150), published in 1990, has been used to fill in
many of the radio velocities. Literature searches have been made
covering the main journals up to Apr-Jun 1991. Whilst the aim is to
obtain all available redshifts, experience has shown that, inevitably,
some references are overlooked, and no claim to completeness can be
made. This is particularly applicable to the Declination zone 0 to -17.5
degrees, into which the catalogue has recently been extended. Apologies
are made to any author whose work has been unintentionally omitted. The
authors would obviously welcome any reports regarding reference
coverage. The preparation of a definitive catalogue that includes all
sources, with exhaustive searching and detailed checking, is a major
task. Its coverage must necessarilly lag behind current literature. The
present work does not claim to be a definitive work, but its coverage is
up to only 3 or 4 months short of its publication. Past versions of this
catalogue have been well received, and demand has prompted the
preparation of the new version. One of the authors (A.P.F.) is also
involved in the preparation of the definitive updated version of the
"Catalogue of Radial Velocities of Galaxies" with G.G.C. Palumbo, G.
Vettolani and G. Baiesi-Pillastrini, based in Bologna. That catalogue
shows all individual measurements for galaxies over the whole sky. A
significant fraction of the effort to produce a catalogue of this nature
goes to dealing with references that give only designations (not always
obvious ones) of galaxies without providing their coordinates - or which
give only galactocentric, not heliocentric, velocities. Such references
can take a considerable amount of processing, even before they are
entered. Authors and referees should appreciate the importance of
accurate coordinates (even with obvious NGC galaxies) for identification
purposes. The released version of this catalogue is a public version.
The full catalogue does include a few hundred addition redshifts
(obtained at the South African Astronomical Observatory, in
collaboration with L. da Costa and his group) that have not yet been
published.
Computer Management of the Catalogue:
The catalogue is managed in IBM-compatible PCs using dedicated software
developed by one of the authors. It allows almost instant access to
galaxies at any coordinate position, or within a chosen error box. It
offers full editing facilties and can produce ASCII files etc. The
procedure for entering a new velocity determination is initiated by
typing in (or interactively feeding from a file) the 1950 coordinates.
The computer then searches within 1m in R.A. and 2 arcmin in Declination
(the generous range in R.A. is to allow for objects close to the pole),
so to determine if an entry for the galaxy already exists. The option is
then given to decide whether to add a new entry or edit an existing one.
One of the features of the software package is the identification of any
form of subset of the data - such as all galaxies within a specified
range of R.A. and Declination, range of galactic longitude and latitude,
specified velocity range or common velocity flag, common reference or
common type. Obviously such subsets are not available in this
publication, but special requests can be considered.
Hardcopy and Computer-readable Versions of this Catalogue:
This catalogue is being distributed in two forms. One is a conventional
printed version, the other is a weight-reduced version with the
catalogue and reference lists compressed onto a computer diskette. The
computer-readable version is distributed by the Strasbourg and Goddard
data centres.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 91 12844 The catalogue
refalp.dat 80 626 The references sorted alphabetically
refnum.dat 80 626 The references sorted by number
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- ID *Designation
22- 23 I2 h RAh *Right ascension hours, 1950.0
25- 26 I2 min RAm *Right ascension minutes, 1950.0
28- 29 I2 s RAs *Right ascension seconds, 1950.0
31 A1 --- DE- Declination sign
32- 33 I2 deg DEd *Declination degrees, 1950.0
35- 36 I2 arcmin DEm *Declination minutes, 1950.0
38- 39 I2 arcsec DEs *Declination seconds, 1950.0
41- 45 F5.1 deg glon Galactic longitude
47- 51 F5.1 deg glat Galactic latitude
53- 57 A5 km/s RV *?Velocity
59- 61 A3 --- n_RV *Velocity flag
63- 65 I3 --- ref1 *?Reference 1
67- 69 I3 --- ref2 *?Reference 2
71- 73 I3 --- ref3 *?Reference 3
75- 77 I3 --- ref4 *?Reference 4
79- 81 I3 --- ref5 *?Reference 5
83- 85 I3 --- ref6 *?Reference 6
87- 88 A2 --- type *Type
91 A1 --- flag *Flag
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Note on ID:
The designations have been entirely picked up from the references
quoted. Thus, if references choose to ignore recognised designations
(such as NGC or ESO) they may also be absent in the catalogue. In
general, ESO designations have been contracted to an "E" prefix. When
multiple designations cause space problems, further contractions, such
as NGC to an "N' prefix, are made. Further information to that given
below is included, where appropriate, in the reference lists.
Note on RA* and DE*:
1950 Coordinates and galactic longitude and latitude are given. In
earlier versions of the catalogue, declinations were rounded off to the
nearest 15 arcsec - this remains for many entries under references 001
to 078. Some entries from Ref 131 onwards were entered from files (put
in the same format as the Bologna catalogue); these have declinations
rounded off to the nearest 6 arcsec. Where galaxies are reported by
different observers, small differences in coordinates sometimes occur,
but usually these are less than 3s in R.A. and 30 arecsec in
Declination. In general, many observers make use of the Lauberts
catalogue so positions are coincidental in the stated coordinates.
Note on RV:
This column provides the "best estimate" of the Heliocentric velocity.
If only a single reference is available, then the value quoted is
straight from that reference. Although individual errors are not shown,
a general error for the reference concerned may be shown in the
reference list. The authors have tried to provide estimated EXTERNAL
errors for the refences. Where these are not shown, one can assume the
standard deviation of the external error to be in the region 100-120
km/s. As a general rule, the true external errors are twice that claimed
by the authors! Experience has shown that, in general, about one or two
percent of the redshift velocities from a given source are completely
erroneous (and sometimes the percentage is higher). This is apparently
unavoidable, given the nature of optical galaxy spectra or radio
confusion, and even the most careful investigators are sometimes fooled
by spurious features or detections. Similarly, cross correlations on
optical spectra can sometimes latch on to the wrong values. Since the
bulk of this catalogue concerns single reference redshifts, it is
possible that 1 percent or so are erroneous. When two or more redshift
references are shown for a galaxy, the catalogue velocity is a form of
mean value, rounded off to the nearest 10 km/s (except if the velocities
agreed to within 20 km/s, when it is rounded to 1 km/s). In deciding
this mean value, extra weighting was given to certain references known
to be more accurate. In general, those optical velocities from higher
dispersion spectra (with external errors better than 50 km/s) had triple
weight. Radio redshifts were given still higher weight, but only when
supported by optical observations. If the reference numbers for an
individual galaxy are not sequential (eg 132 076), then the mean value
is weighed towards the value in the first reference (ie 132). The
maximum acceptable differences between optical velocities is considered
here to be 400 km/s, that between radio velocities is 100 km/s. If only
two references are available, and there is no indication as to which is
likely to be correct, then, rather than enter an uncertain value, a flag
"LD" (for Large Difference) is substituted when the difference is
greater than the above. Where there are three or more references, but
one is discrepant (the others are considered valid), the discrepant
reference is separated from the others by a blank space (e.g. 079 082
076). There are, in the catalogue, a few cases where three references
fail to show any agreement, and one case where four different references
all show totally different redshifts for the same galaxy. A few authors
quote only galactocentric, rather than heliocentric, velocities, ie
Vo (= V + 300 sin l cos b);
where possible, we have calculated cz = V, but usually rounded off to
10 km
Note on n_RV:
There are other cases where flags occur in place of a velocity. These are:
SS - Superposed foreground star with near zero velocity.
NE - No strong emission lines. The quality of the spectrogram did
not permit redshift determination, but strong emission lines can
be excluded.
TF - Too faint. The galaxy is of low surface brightness and only a
tentative redshift (not given) could be obtained, or no redshift
obtained from the spectrogram.
ESO4 - Reference 048. Observed spectroscopically at the European
Southern Observatory, but no accurate redshift apparently yet
available.
NV - Observed spectroscopically but no velocity yet available. Worth
including because of classification under Type column (e.g.
Seyfert).
Note on ref*:
The source references are given a three-digit numerical code. (See
refs.dat.) As mentioned above, the catalogue was originally founded on
data extracted from the de Vaucouleurs Second Reference Catalogue
(Reference 001 - which covers redshift measurements published 1975 and
earlier) with subsequent additions (References 002 onwards). Thus the
listing that follows forms a source of southern redshifts, except that a
number of Seyfert galaxies, having a single reference for a single
galaxy, have been put under umbrella Seyfert lists. The numerical codes
for references simply reflect the order in which the data were entered
into the catalogue. It is roughly chronological (but occasionally a
reference overlooked earlier is added). Gaps in sequential reference
numbers result from some consolidation of references used in earlier
editions. or where references are not yet public. When multiple
references are listed, the order may reflect the weighting given to
velocities (see above).
Note on type:
The second last column identifies Seyfert galaxies, and partially
identifies other galaxies with emission lines in their optical spectra
(where this can be easily read from the reference concerned).
Abbreviations are as follows:
S1 - Seyfert 1
S2 - Seyfert 2
S3 or S? - Suspected Seyfert
BL - BL Lac object
H2 - H II emission, generally implying strong emission
lines of relatively high excitation, including [O III] 5007 + 4959
emission.
EM - Generally implies low-excitation emission, [O II] 3727
and/or H-alpha, or unspecified emission.
These classifications are obviously not uniform between different
references, but nevertheless serve as a useful indication.
Note on flag:
The flag is as follows:
O - The reference or references only give optical velocities
R - The reference or references only give radio velocities
B - Both optical and radio velocities
Byte-by-byte Description of file: refalp.dat, refnum.dat
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Bytes Format Units Label Explanations
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1- 80 A80 --- ref Reference; the first line has
a blank in byte 1, followed
a 3-digit reference ID
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Acknowledgements:
The authors thank. Penny Dobbie is thanked for help with layout and
printing of the catalogue. They also thank various colleagues who have
reported corrections to the previous version, particularly H. Winkler,
H. Andernach, V. Liporetsky and G. Paturel. The Foundation for Research
Development and University of Cape Town have provided research funding
that contributed to the production of this work.
The original document was prepared by the authors in October 1991. The
contact for the first author is:
Anthony P. Fairall, Department of Astronomy, University of Cape Town,
Rondebosch. 7700 SOUTH AFRICA
Telephone: (27)(21)650-2392 Fax: (27)(21)650-3726 E-mail:
FAIRALL@UCTVAX.UCT.AC.ZA
The document was prepared for the ADC by Anne C. Raugh and converted to
the current standard form by the undersigned. The format tables were
added. Various corrections were made to catalog.dat and the blank lines
were removed from the reference tables.
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(End) Nancy G. Roman [ADC/SSDOO] 07-26-95