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NEARGALCAT - Neighboring Galaxies Catalog

 HEASARC
Archive

Overview

This table contains an all-sky catalog of 451 nearby galaxies, each having an individual distance estimate D <~ 10 Mpc or a radial velocity with respect to the Local Group (LG) centroid VLG < 550 km/s. The catalog contains data on basic optical and H I properties of the galaxies, in particular, their diameters, absolute magnitudes, morphological types, circumnuclear region types, optical and H I surface brightnesses, rotational velocities, and indicative mass-to-luminosity and H I mass-to-luminosity ratios, as well as a so-called tidal index, which quantifies the galaxy environment. The authors expect the catalog completeness to be roughly 70% - 80% within 8 Mpc.

Catalog Bibcode

2004AJ....127.2031K

References

A catalog of neighboring galaxies.
    Karachentsev I.D., Karachentseva V.E., Huchtmeier W.K., Makarov D.I.
   <Astron. J., 127, 2031-2068 (2004)>
   =2004AJ....127.2031K

Provenance

This table was created by the HEASARC in July 2012 based on CDS Catalog J/AJ/127/2031 files table1.dat and table4.dat. Note that the file table1.dat contains the contents of both Tables 1 and 2 from the published reference paper.

HEASARC Implementation

The HEASARC has expanded some (but not all) of the names given in the original as published table to make them consistent with the standard nomenclature: 'HIJASS' to 'HIJASS J1021+68', 'E' to 'ESO', 'N' to 'NGC', 'U' to 'UGC', and 'I' to 'IC'. Many of the remaining names are non-standard and might not be resolved by the SIMBAD name resolver.

Parameters

Name
The galaxy name (Cetus, And III, etc.) or number in the known catalogs: NGC, IC, UGC (Nilson 1973, Uppsala General Catalogue of Galaxies), UGCA (UA in this table, Nilson 1974, Catalogue of Selected Non-UGC Galaxies), DDO (D in this table, van den Bergh 1966, AJ, 71, 922), ESO/Uppsala (Lauberts 1982, ESO/Uppsala Survey of the ESO(B) Atlas), PGC (P in this table, Paturel et al. 1996, Catalog of Principal Galaxies), and Karachentsev's lists (KK, KKR, KKH, KKSG, KKs: references given in bibliography of reference paper) usually in chronological preference.

Alt_Name
An alternative name for the galaxy using the same nomenclature scheme as for the primary name.

RA
The Right Ascension of the galaxy in the selected equinox. This was given in J2000.0 equatorial coodinates to a precision of 0.1 seconds of time in the original reference.

Dec
The Declination of the galaxy in the selected equinox. This was given in J2000.0 equatorial coodinates to a precision of 1 arcsecond in the original reference.

LII
The Galactic Longitude of the galaxy.

BII
The Galactic Latitude of the galaxy.

Major_Axis
The major axis angular diameter a , in arcminutes, measured at a level of ~ 25 mag arcsec-2. For dwarf galaxies of low surface brightness from the KK lists, their diameters correspond to the Holmberg system (~ 26.5 mag arcsec-2).

Axial_Ratio
The apparent axial ratio, b/a.

Bmag
The integrated apparent magnitude in the B band, Bt. As the main source of data on Bt, the authors use the NASA Extragalactic Database (NED) with additions from the recent publications by Makarova (1999, A&AS, 139, 491) Bremnes, Binggeli, & Prugniel (1998, A&AS, 129, 313; 1999, A&AS, 137, 337; 2000, A&AS, 141, 211), Parodi, Barazza, & Binggeli (2002, A&A, 388, 29) etc. For some dwarf low surface brightness (LSB) galaxies, their magnitudes are known with an accuracy of ~ 0.5 mag only.

Bmag_Flag
This flag parameter is set to ':' if the associated parameter value is considered to be of low accuracy.

Bmag_Gal_Extinction
The Galactic extinction in the B band Ag from Schlegel, Finkbeiner, & Davis (1998, ApJ, 500, 525). Estimates of Ag for some galaxies situated in the zone of avoidance (for instance, Maffei I) were made from their individual colors.

Morph_Type
The morphological type T in the numerical code according to de Vaucouleurs et al. (1991, Third Reference Catalogue of Bright Galaxies, also known as RC3).

Circumnuclear_Type
The type of circumnuclear region, T_n_: (K) kern, a stellar-like nucleus; (B) bulge, where a stellar-like nucleus may be hidden because of strong extinction or a steep brightness gradient. (A) absence of a distinct nucleus. The main sources for the classification were 2MASS images (Jarrett et al. 2000, AJ, 119, 2498) and high-resolution images of galaxies from the HST archive (see the illustrations and details in Karachentsev and Karachentseva 2002, AGN Surveys, ASP. Conf. Ser. 284).

Radial_Velocity
The heliocentric radial velocity Vh, in kilometers per second, from NED or from recent sources (Huchtmeier et al. 2000, A&AS, 141, 469; 2001, A&A, 377, 801; 2003, A&A, 401, 483; Makarov et al., 2003, A&A, 405, 951).

Radial_Velocity_Flag
This flag parameter is set to ':' if the associated parameter value is considered to be of low accuracy.

Lg_Radial_Velocity
The radial velocity with respect to the LG centroid VLG, in kilometers per second, with the apex parameters according to Karachentsev and Makarov (1996, AJ, 111, 794).

H1_50pc_Width
The H I line width at the 50% level from the maximum W50, in kilometers per second, taken from the Lyon Extragalactic^MDatabase (LEDA) or from Huchtmeier et al. (2000, A&AS, 141, 469; 2001, A&A, 377, 801; 2003, A&A, 401, 483). For some southern dwarf galaxies, their line widths were measured on the basis of the H I Parkes Sky Survey (HIPASS) data (accessible at http://www.atnf.csiro.au/).

Log_H1_Flux
The logarithm of the total H I flux log FHI , in Jy km s-1, from the LEDA, Huchtmeier et al. (2000, 2001, 2003), or from the HIPASS.

Distance
The distance D to the galaxy, in megaparsecs (Mpc).

Distance_Flag
This flag parameter is set to ':' if the associated parameter value is considered to be of low accuracy.

Distance_Method
The method used to determine the distance to the galaxy: 

    Code   Meaning

     cep:  Derived from the luminosity of cepheids;
     rgb:  Derived from the luminosity of the tip of the red gaint branch (RGB);
     sbf:  Derived via the fluctuation of surface brightness method;
     bs:   Derived from the luminosity of the brightest stars;
     tf:   Derived from the Tully-Fisher relation;
     mem:  Derived from membership in known group(s);
     h:    Derived from the Hubble relation VLG = H0 * D, with the mean
           local Hubble parameter H0 = 72 km s-1 Mpc-1 (Karachentsev et
           al. 2003, A&A, 398, 479), coinciding with its global value
           (72 +/- 8) km s-1 Mpc-1 (Freedman et al. 2001, Ap, 553, 47).

Notes
This parameter contains references to the distance estimates and to galaxy membership in known groups. References to photometric data are indicated with the 'ph' annotation.

Linear_Diameter
The major axis linear diameter A25, in kiloparsecs, corrected for galaxy inclination and the Galactic extinction in the manner adopted in RC2 (de Vaucouleurs, de Vaucouleurs, & Corwin 1976, Second Reference Catalogue of Bright Galaxies, or RC2), i.e.: 

  log A25 = log Akpc - 0.20*log(a/b) + 0.09*Ag

Inclination
The inclination i from face-on, in degrees, where 

  sin2(i) = [1 - (b/a)2]/[1 - (b/a)02],
where (b/a)0 = 0.07, if T = 6 or 7, (b/a)0 = 0.12, if T = 5 or 8, (b/a)0 = 0.18, if T = 4 or 9, and (b/a)0 = 0.20, if otherwise.

H1_Rot_Velocity
The H I rotational velocity Vm = W50/[2*sin (i)], corrected for inclination and turbulent motions according to Tully & Fouque (1985, ApJS, 58, 67) with isotropic noncircular motion parameter sigmaz = 8 km s-1 (the correction for turbulent motions for some dwarf galaxies with W50 <= 20 km s-1 leads to negative values of Vm, and the authors adopt for them a formal value Vm = 5 km s-1).

Bmag_Int_Extinction
The internal absorption in the galaxy in the B band, Ai. According to Giovanelli et al. (1994, AJ, 107, 2036) and Tully et al. (1998, AJ, 115, 2264), the internal absorption, Ai, depends not only on inclination, but also on galaxy luminosity. Based on the data by Verheijen (2001, ApJ, 563, 694) and Karachentsev, Karachentseva, & Kudrya (1999, AstL, 25, 1), the authors determined the internal absorption as: 

  Ai =  [1.6 + 2.8*(log Vm - 2.2)]*log(a/b),
if Vm > 42.7 km s-1, otherwise, Ai = 0 (so the authors considered dwarf galaxies to be fully transparent). For the gas-poor E, S0, and dSph galaxies without estimates of W50, the Ai correction was also ignored.

Abs_Bmag
The absolute B-band magnitude Mb corrected for Ag and Ai.

Bmag_Surface_Brightness
The mean surface brightness SigmaB , in mag arcsec-2, given by: 

  SigmaB = (Bt - Ag - Ai) + 5*log(ac) + 8.63.

H1_Mass_To_Lum_Ratio
The H I mass-to-luminosity ratio, MHI/L, in solar units, where 

  log (MHI/Msolar) = log FHI + 2*log D + 5.37
(Roberts & Haynes 1994, ARA&A, 32, 115) and D is the galaxy distance in Mpc.

Log_H1_Surface_Density
The logarithm of the neutral hydrogen (H I) surface density SigmaHI = 4*MHI/(pi * A252), in solar masses kpc-2,

Log_S25_Galaxy_Mass
The logarithm of the "indicative" mass M25 of the galaxy within its standard diameter A_25_: 

  log (M25/Msolar) = 2*log Vm + log ac + log D + 4.52,
where Vm is expressed in km s-1, ac in arcminutes, and D in Mpc. (Roberts & Haynes 1994, ARA&A, 32, 115).

Mass_To_Lum_Ratio
The indicative mass-to-luminosity ratio, M25/L, in solar units.

Tidal_Index
The tidal index Theta, determined as discussed in Section 6 of the reference paper. Negative values of Theta correspond to isolated galaxies, and positive values are typical of group members.

Neighbor_Galaxy_Name
The name of a neighboring galaxy ("main disturber" = MD) producing the maximum tidal action on the given galaxy. In fact, a collection of galaxies with one and the same main disturber, and also a positive Theta value, may be considered as a separate group (see also the notes parameter).

Class
The HEASARC Browse object classification, based on the value of the morph_type parameter.

Contact Person

Questions regarding the NEARGALCAT database table can be addressed to the HEASARC User Hotline.

A service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysics Observatory (SAO)

Page Author: Browse Software Development Team
Last Modified: 23-Jul-2012