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Astron. Astrophys. 353, 92-96 (2000)

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2. Sample of galaxies

We used the deepest currently available deep fields (HDF-N - Williams et al. 1996 and HDF-S - Williams et al. 1999) to search galaxies with extended tidal tails. From detailed examination of the fields in the F814W filter (hereinafter referred to as I), we selected more than 70 tailed objects. Careful analysis of their images in combination with the redshift data enabled us to distinguish 25 galaxies with [FORMULA] (12 objects in the HDF-N and 13 in the HDF-S). Galaxies with tidal tails in the HDF-N are described in detail in Paper I. Here we present the data for the HDF-S objects (Fig. 1). (Our statistics of galaxies with tidal structures are in general agreement with van den Bergh et al. (1996) data on morphology of galaxies in the HDF-N. van den Bergh et al. classified 20 galaxies with [FORMULA] as objects with probable tidal distortions in the HDF-N.)

[FIGURE] Fig. 1. The I-band images of the HDF-S galaxies with tidal tails. The size of the panel is 19"[FORMULA]19".

General characteristics of the galaxies are summarized in Table 1. The columns of the table are: galaxy identification, I band apparent magnitude, photometric redshift (there are no published spectroscopic redshifts for the sample galaxies). All the data are taken from the web site of the HDF-S group at SUNY, Stony Brook (Chen et al. 1998). In the fourth column we present the absolute magnitude in the rest-frame B band calculated according to Lilly et al. (1995) as:

[EQUATION]

where

[EQUATION]

- luminosity distance ([FORMULA]), [FORMULA] - the Hubble constant (75 km/s/Mpc), [FORMULA] - deceleration parameter ([FORMULA]=0.05), [FORMULA] - k-correction color (we used correction for Sbc galaxy), and term 0.17 translates AB magnitudes into standard B.


[TABLE]

Table 1. Characteristics of galaxies in the HDF-S


In Table 2 we compare mean characteristics of the tailed galaxies in two deep fields. As one can see, both samples are consistent within quoted errors.


[TABLE]

Table 2. Mean characteristics of interacting galaxies


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© European Southern Observatory (ESO) 2000

Online publication: December 8, 1999
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