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astro-ph/9804064
SSRS
From: pssp@dans.on.br (Paulo Sergio de Souza Pellegrini)
Date: Mon, 6 Apr 1998 19:31:00 GMT (39kb)
The Southern Sky Redshift Survey
L. Nicolaci da Costa, C. N. A. Willmer, P. S. Pellegrini, O. L.
Chaves, C. Rite, M. A. G. Maia, M. J. Geller, D. W. Latham, M. J. Kurtz, J.
P. Huchra, M. Ramella, A. P. Fairall, C. Smith, S. Lipari
Abstract
We report redshifts, magnitudes and morphological
classifications for 5369 galaxies with $m_B \leq 15.5$ and 57 galaxies
fainter than this limit, in two regions covering a total of 1.70
steradians in the southern celestial hemisphere. The galaxy catalog is
drawn primarily from the list of non-stellar objects identified in the
Guide Star Catalog (Lasker et al. 1990, AJ 99, 2019; hereafter GSC).
The galaxies have positions accurate to $\sim 1^{\prime\prime}$ and
magnitudes with an rms scatter of $\sim 0.3^m$. We compute magnitudes
($m_{SSRS2}$) from the relation between instrumental GSC magnitudes and
the photometry by Lauberts \& Valentijn (1989). From a comparison with
CCD photometry, we find that our system is homogeneous across the sky
and corresponds to magnitudes measured at the isophotal level $\sim$ 26
mag arcsec$^{-2}$. The precision of the radial velocities is of $\sim$
40 \kms\ and the redshift survey is more than 99\% complete to the
$m_{SSRS2}$ = 15.5 magnitude limit. This sample is in the direction
opposite to the CfA2; in combination the two surveys provide an
important database for studies of the properties of galaxies and their
large-scale distribution in the nearby Universe.
Constructing the catalog
We selected the SSRS2 galaxy sample from the list of non-stellar objects
in the GSC. The sample covers the region --40\deg $\leq \delta \leq$
--2.5\deg and b $\leq$ --40\deg in the Southern Galactic cap (SSRS2
south), and the region $\delta \leq 0$\deg and b $\geq$ +35\deg in the
Northern Galactic cap (SSRS2 north). The northern limits in declination
make the SSRS2 contiguous with the CfA2.
The Catalog
The complete table is available in our www site http://obsn.on.br/ssrs2.
The number of galaxies in the survey is 5426: 3489 are in
the southern galactic cap $b \leq -40^\circ$ and $\delta \leq -2.5^\circ$
(1.13 steradians), and 1937 are in the northern
galactic cap $b \geq 35^\circ$ and $\delta \leq 0^\circ$ (0.57
steradians). The sample contains objects (836 galaxies, or
15 \% of the sample) previously observed for the diameter-limited
SSRS (da Costa \etal 1991). We measured 2828 new redshifts or 52\% of
the sample, including galaxies from a survey of the equatorial region
(Huchra \etal 1993).
Tables 2 and 3 contain the SSRS2 catalog. Table 2 contains 5369
galaxies (3439 in the SSRS2 south
and 1930 in the SSRS2 north) with $m_{SSRS2} \leq 15.5$.
These galaxies constitute a well-defined, magnitude-limited sample for
statistical analyses. For each object the entries are:
column (1) the galaxy identification in the GSC;
column (2) the ESO or MCG identification;
columns (3) and (4) B1950.0 equatorial coordinates;
column (5) the $m_{SSRS2}$ magnitude;
column (6) the heliocentric radial velocity $v_\odot$;
column (7) the estimated internal error, $\epsilon$, in the radial velocity;
column (8) galaxy morphologies with T types as discussed in Section 2.3;
column (9) the source for the radial velocity, where zero represents a
value from the literature, and numbers 1 to 9 are the sites in Table 1;
column (10) an indicator for galaxies without a radial velocity
because of superposed stars (``star''), or because of low surface
brightness requiring long integration times (``lsb'');
column (11) other identifications for galaxies (e.g. NGC or IC number).
Only the first page of Table 2 is shown in this publication.