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|Arcsecond Positions of UGC Galaxies|
We present accurate B1950 and J2000 positions for all confirmed galaxiesin the Uppsala General Catalog (UGC). The positions were measuredvisually from Digitized Sky Survey images with rms uncertaintiesσ<=[(1.2")2+(θ/100)2]1/2,where θ is the major-axis diameter. We compared each galaxymeasured with the original UGC description to ensure high reliability.The full position list is available in the electronic version only.
|Total magnitude, radius, colour indices, colour gradients and photometric type of galaxies|
We present a catalogue of aperture photometry of galaxies, in UBVRI,assembled from three different origins: (i) an update of the catalogueof Buta et al. (1995) (ii) published photometric profiles and (iii)aperture photometry performed on CCD images. We explored different setsof growth curves to fit these data: (i) The Sersic law, (ii) The net ofgrowth curves used for the preparation of the RC3 and (iii) A linearinterpolation between the de Vaucouleurs (r(1/4) ) and exponential laws.Finally we adopted the latter solution. Fitting these growth curves, wederive (1) the total magnitude, (2) the effective radius, (3) the colourindices and (4) gradients and (5) the photometric type of 5169 galaxies.The photometric type is defined to statistically match the revisedmorphologic type and parametrizes the shape of the growth curve. It iscoded from -9, for very concentrated galaxies, to +10, for diffusegalaxies. Based in part on observations collected at the Haute-ProvenceObservatory.
|Photoelectric Photometry of Zwicky Galaxies|
Multiaperture photoelectric measurements in the B and V bands arepresented for 601 galaxies in Volumes I, II, and V of Zwicky'scatalogue. Large aperture observations were made in the 1960's with theLick 3 m telescope and the USNO 1 m telescope. Systematics in Zwicky'smagnitude system are investigated as a function of magnitude anddirection in the sky. The photoelectric sample is argued to berepresentative of galaxies in Zwicky's catalogue at B ~ 15. A strongsystematic error in Zwicky's magnitudes is apparent in Volume I fainterthan m_z_ = 15.0. The B - V color distribution is discussed.
|A redshift survey for faint galaxies towards voids of galaxies.|
We present the redshift and photometric data of a survey forintrinsically faint galaxies towards three nearby voids and the Herculessupercluster. The project is aimed at finding galaxies of absolute faintmagnitudes or of low surface brightness within these voids. Theselection of the voids and the search strategy for the galaxies areoutlined. B and R magnitudes, major and minor diameters, as well as themorphology are determined. The diameter distribution of the galaxies isdiscussed. Optically measured redshifts of 174 galaxies are given. Mostof the galaxies found show emission lines and late-type morphology.Several have low-surface brightness features. Our survey identified ahigher percentage of nearby galaxies than magnitude or diameter limitedsurveys.
|A survey of the Pisces-Perseus supercluster. VI - The declination zone +15.5 deg to 21.5 deg|
New results are presented of Arecibo observations in the 21 cm line of765 galaxies with declinations between 15.5 deg and 21.5 deg, in thePisces-Perseus supercluster zone. If considered independently on theneighboring parts of sky, this region, to the South of the superclusterridge, shows significantly less evidence of structure on large scales inexcess of 30 Mpc, contrasting substantially with the characteristics ofthe declination zones immediately to the North.
|An extragalactic database. I - The Catalogue of Principal Galaxies|
The Catalogue of Principal Galaxies is described, which lists equatorialcoordinates (for the equinoxes 1950 and 2000) and cross-identificationsfor 73,197 galaxies. The 40,932 coordinates have standard deviationssmaller than 10 arcsec. A total of 131,601 names from the 38 most commonsources are listed. In addition, mean data for each object are givenwhen available: 49,102 morphological descriptions, 52,954 apparent majorand minor axes, 67,116 apparent magnitudes, 20,046 radial velocities and24,361 position angles. This information was used for facilitatingproper identification. Finally, distribution options are explained.
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