Astronomy & Astrophysics

All Tables

Table 1: Salient parameters of six Southern Compact Groups of galaxies. $N_{\rm conc}$ is the number of concordant galaxies in the original SCGs catalog, while $N_{\rm Gal}$ is the total number of confirmed member galaxies fulfilling the group selection criteria and having a similar redshift from optical and radio data.
Table 2: Observing log; SCG 2159-3210 has not been observed by us in the optical and related results are taken from the literature.
Table 4: ATCA observation details. The array is operated in configurations with maximum baselines ranging from 75 m to 6 km. For 750-m, 1.5-km and 6-km configurations, 4 subsets (A, B, C, D) each exist.
Table 5: Classification of the compact groups and neighbouring large scale structures. The radius in Mpc is the median radius of each group, while the value given in parenthesis is the physical radius in Mpc corresponding to 15 $\hbox {$^\prime $ }$ . Column 4 shows the logarithm of the galaxy number density for the original galaxies in the SCGs, while in Col. 5 we show the logarithm of the galaxy number density obtained by including all galaxies within a circle of 15 $\hbox {$^\prime $ }$ radius. It is worth to note the remarkable galaxy density of SCG0018-4854.
Table 6: Group dynamical properties. $\sigma _{r}$ , R, $H_{\rm o}t_{\rm c}$ and M/L are expressed in logarithmic values; mass and luminosity are given in solar units. All quantities for SCG0018-4854 and SCG0122-3819 have been estimated taking into account 5 member galaxies rather than four, as in the original catalog; for a more detailed explanation, see Sect. 3.5. The values in parenthesis for the $M_{\rm vir}$ and $M_{\rm isotropic}$ are the luminosity weighted mass estimates. The symbols follow Hickson et al. (1992).
Table 7: Measured values of H I deficiency for SCGs in our sample. Following VM01, we assume that a group can be considered H I deficient if the difference between predicted and observed mass is more than twice the standard estimate of the error.
Table 3: Results from the GALFIT analysis on the member galaxies of our SCGs. The symbols used here have the same meaning as in Peng 2002; the position angle is measured from N to E counterclockwise. The magnitude is the total magnitude of the component, corrected for galactic extinction; errors on the measured magnitudes are of the order of 0.05 magnitudes and refer to the accuracy in the measurement of the zero-point plus the sky subtraction and the statistical error from GALFIT. Group SCG2159-3210 and galaxy SCG0122-3819 e have not been observed by us in the optical; for photometric measurement the reader is referred to Hickson et al. 1982 and to NED.