2 Initial data

As the main source of data on optical and HI properties of galaxies, we used the last version (LEDA) of the Principal Galaxy Catalogue [21, (Paturel et al. 1992).] For many galaxies their apparent magnitudes, angular diameters and morphological types were revised using large scale CCD frames obtained with the SAO 6-meter telescope and the 2.6-meter Nordic telescope. From the list of galaxies with V₀ < 500 kms^-1 we excluded about 100 objects in the central region of the Virgo cluster and also more than 50 fictitious "nearby galaxies" (i.e. globular clusters, planetary nebulae or cases when the radial velocity is inherent in a bright star projected on a distant galaxy). Our sample (the Local Volume sample = LV) is updated by new objects from the list of [16, Karachentseva & Karachentsev (1998)] and other recent sources. Particularly, there were taken into account the results of HI searches for nearby dwarf galaxies made by [9, Huchtmeier et al. (1997, 1999)] and [6, Cote et al. (1997).] Our updated version of the KKT sample contains a total of 303 galaxies. For the galaxies with measured HI flux, S (Jansky kms^-1), corrected for beam-filling effect we calculated the mass of its neutral hydrogen where D is the distance to a galaxy in Mpc. For 188 galaxies we used individual photometric distance estimates. For 47 galaxies located within the known groups we adopted the median distance of each group, and for 83 galaxies their distances were determined via radial velocity: D= V₀/H. The local value of the Hubble parameter was taken to be H = 70 kms^-1/Mpc. The radial velocity of galaxies, V₀, was corrected for the solar motion with respect to the Local Group centroid towards ${l_{\rm A}= 93\hbox{$^\circ$}, b_{\rm A}= -4\hbox{$^\circ$}}$ with the $V_{\rm A}= 316$ kms^-1 [15, (Karachentsev & Makarov 1996).] Calculating the total blue luminosity of the galaxy, $L/L_{\hbox{$\odot$}}$, and its standard linear diameter, A₂₅ (in Kpc), we took into account corrections for the Galactic extinction and the galaxy inclination in the manner adopted in PGC. For heavy obscured objects we used extinction values from the IR sky map by [25, Schlegel et al. (1998).] To estimate the "total" mass enclosed inside the standard angular diameter, a₂₅, (in arcmin) we used the relation where $V_{\rm m}$ means the galaxy rotation amplitude (in kms^-1) corrected for inclination and turbulence. For dwarf galaxies inclination values are rather uncertain as they are normally derived from uncertain axial ratios. The transformation of the galaxy HI line width W₅₀ or W₂₀ into $V_{\rm m}$ was done following the model of corrections for turbulent motions by [27, Tully (1988)] with parameters $\sigma_{\rm t} = 19$ kms^-1 and $\sigma_z = 12$ kms^-1. Due to the uncertainty of correction for inclination of galaxies having axial ratio b/a > 0.8 we did not determine the total mass of such galaxies.

The resulting list of basic parameters for the considered galaxies is given in the Appendix. Its columns contain: (1) the galaxy name (And III, Cas 1, etc.) or number in different catalogues and lists: NGC (N), IC, UGC (U), UGCA (UA), PGC (P), DDO, KK [16, (Karachentseva & Karachentsev 1998),] (2) its rough coordinates on (1950.0), (3) blue total magnitude, (4) corrected radial velocity, (5) morphological type, (6) distance in Mpc with indication of its origion: P - photometric, M - from membership, H - from the Hubble low, (7) tidal index, (8) logarithm of corrected linear diameter in Kpc, (9) logarithm of luminosity in solar units, (10) logarithm of rotational velocity in $\rm km\,s^{-1}$ corrected for inclination, (11) logarithm of "total" mass-to-luminosity ratio in solar units, (12) logarithm of HI mass-to-luminosity ratio in solar units, (13) logarithm of fractional HI mass, (14) mean optical surface brightness in $\rm mag/square\,arcsec$. In total the Appendix contains data on 275 galaxies with $V_0 < 500\, {\rm km\,s}^{-1}$, and 28 dwarf spheroidal galaxies without V₀ but being highly probable members of the known nearby groups. We add to the list also 15 galaxies with 500 < V₀ < 1000 kms^-1 having distance estimates within 10 Mpc. References to sources of data on the presented galaxies are accessable from the e-mail address: dim@sao.ru.

 

Table 1: Coefficients of linear regression, y = k x + c, for the global parameters of nearby galaxies