Access to Astronomical Catalogues

← Click to display the menu
J/A+A/296/643    Low Surface Brightness galaxies in Coma   (Karachentsev+ 1995)

A search for low surface brightness dwarf galaxies in the Coma cluster core Karachentsev I.D., Karachentseva V.E., Richter G.M., Vennik J.A. <Astron. Astrophys. 296, 643 (1995)> =1995A&A...296..643K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry Keywords: Coma cluster - galaxies: dwarf - galaxies: general Abstract: Using the prime focus of the 6-meter telescope, we have searched for low surface brightness dwarf galaxies in two regions in the Coma cluster: one in the center of the cluster and the other one 40arcmin to the west. The observations were carried out with a total exposure time 4x5x600sec and with a 1.2arcsec seeing. Our survey is complete down to V=25.5 and R=25.0mag. The central field shows an excess of faint galaxies (121 versus 104 in the reference field) significant at a one sigma level only. However, the central-field excess is mainly caused by the presence of faint (V=24/25mag), neutral colour (V-R=0.3/0.4) objects of low surface brightness, SB=26.0/26.5mag/arcsec2. These characteristics are quite consistent with those of the dwSph's in the Local Group which have typically Mv∼10mag and A∼1kpc. The observed excess corresponds to a surface number density of 4gal/arcmin2 in the center of Coma, thus implying a total population of cluster dwarfs of ∼4000 down to the limiting absolute magnitude -10mag. The number ratio of LSBD's to normal galaxies (with M←18mag for normals) in Coma turns out to be 20:1. Such ratio is comparable to that observed in other rich clusters: A3574 (14:1) and A1367 (6:1), but is much larger than the 2:1 ratio obtained for moderate nearby clusters such as Virgo, Fornax, Antlia. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 46 121 Properties of galaxies in the central Coma field table2 46 104 Properties of galaxies in the reference field
Byte-by-byte Description of file: table1 table2
Bytes Format Units Label Explanations
1- 3 I3 --- ID Galaxy identification number 5- 9 F5.2 mag Vmag Apparent total V magnitude 11- 15 F5.2 mag Rmag Apparent total R magnitude 17- 20 F4.1 arcsec DiamV Angular diameter measured on V frame 22- 25 F4.1 arcsec DiamR Angular diameter measured on R frame 27- 31 F5.2 mag/arcsec SBV Average surface brightness within DiamV 33- 37 F5.2 mag/arcsec SBR Average surface brightness within DiamR 39- 43 F5.2 mag V-R Total V-R color index 45- 46 A2 --- Note Notes (1)
Note (1): bn: binary image df: diffuse object without a marked brightness gradient st: star-like image
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 07-Mar-1997
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact