Contents
Images
Upload your image
DSS Images Other Images
Related articles
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.
| UBVRI photometry of the Durham-AAT redshift survey
Using the PDS microdensitometer at the Royal Greenwich Observatory, wehave acquired U, B, V, R and I surface photometry from UK Schmidtphotographic plates for all the galaxies with measured redshifts in theDurham-AAT redshift survey. By comparison with CCD photometry we showthat such precision photographic photometry of galaxies off IIIaemulsions is capable of an accuracy as good as a few hundredths of amagnitude. We discuss the color-related properties of these galaxies,and derive luminosity functions in each waveband. We show that, whendivided by color, the faint-end slope of the luminosity function of thebluer galaxies is significantly steeper than that for the redder ones.
| An image database. II. Catalogue between δ=-30deg and δ=70deg.
A preliminary list of 68.040 galaxies was built from extraction of35.841 digitized images of the Palomar Sky Survey (Paper I). For eachgalaxy, the basic parameters are obtained: coordinates, diameter, axisratio, total magnitude, position angle. On this preliminary list, weapply severe selection rules to get a catalog of 28.000 galaxies, wellidentified and well documented. For each parameter, a comparison is madewith standard measurements. The accuracy of the raw photometricparameters is quite good despite of the simplicity of the method.Without any local correction, the standard error on the total magnitudeis about 0.5 magnitude up to a total magnitude of B_T_=17. Significantsecondary effects are detected concerning the magnitudes: distance toplate center effect and air-mass effect.
| CCD galaxy photometry and the calibration of photographic surveys
We present CCD UBVRI aperture photometry and total B-band magnitudes fora sample of 155 galaxies with B<~18 covering 14UK Schmidt fields. The data, taken on a variety of telescopes, have beenacquired in order to calibrate photographic photometry on these fields.Using these data, we discuss the calibration of photographic galaxysurveys at these magnitudes, and show that the accuracy of suchphotometry is potentially better than +/-0.05 mag. However, data fromboth the COSMOS and APM automatic plate measuring machines show strongsurface-brightness-dependent systematic errors, which primarily manifestthemselves as a much increased scatter (~+/-0.25 mag). The cause ofthese effects is almost certainly related to the limited dynamic rangeof the automated machines. They have the potential to introduce scaleerrors of up to ~0.1 mag per magnitude into the photographic magnitudes,and we discuss the implications of this for bright galaxynumber-magnitude counts. We show evidence for a scale error in the APMgalaxy survey magnitudes. Our revised APM magnitudes allow a standard,non-evolving cosmological model to fit the APM galaxy counts in therange 17<B<20, although this model continuesto overpredict the galaxy count at brighter magnitudes.
| General study of group membership. II - Determination of nearby groups
We present a whole sky catalog of nearby groups of galaxies taken fromthe Lyon-Meudon Extragalactic Database. From the 78,000 objects in thedatabase, we extracted a sample of 6392 galaxies, complete up to thelimiting apparent magnitude B0 = 14.0. Moreover, in order to considersolely the galaxies of the local universe, all the selected galaxieshave a known recession velocity smaller than 5500 km/s. Two methods wereused in group construction: a Huchra-Geller (1982) derived percolationmethod and a Tully (1980) derived hierarchical method. Each method gaveus one catalog. These were then compared and synthesized to obtain asingle catalog containing the most reliable groups. There are 485 groupsof a least three members in the final catalog.
| 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.
| A complete galaxy redshift sample. III - Methods and catalogue
Redshifts and photometry are presented for 329 field galaxies selectedin five high-latitude fields to limiting isophotal B1 magnitudes ofabout 17. The essential spectroscopy was obtained at theAnglo-Australian Telescope. It is demonstrated that the photometricprecision is better than 0.10 mag and that the radial velocity errorsare mostly below 45 km/s. Some aspects of the galaxy distribution andspectral-line statistics are briefly discussed.
| New galaxies with high surface brightness in the Nilson system
Using Arkelian's criteria (1974, 1975), data for 47 new High SurfaceBrightness Galaxies (HSBG) in the system of the Uppsala GeneralCatalogue of Galaxies are presented. Of the 193 Arkelian galaxies listedin the catalog, 46 were also found to be HSBGs in the Nilson system(1973). The present list contains 19 Zwicky (1971) compact galaxies (40percent), two of which are listed as HSBGs by Nilson.
| Accurate Optical Positions of Arakelian Galaxies
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1981AJ.....86..820K&db_key=AST
| Galaxies of high surface brightness
Two lists are presented which contain 621 galaxies whose surfacebrightness, as derived from their apparent magnitudes, is at least 22.0magnitudes from an area of 1 sq arcsec. The lists were compiled in anattempt to verify observationally a possible correlation between surfacebrightness and nuclear activity. Four percent of all the galaxies in anarea of 4.5 sr at declinations higher than -3 deg and galactic latitudesgreater than 20 deg are listed, including 30 Markarian, 29 Zwicky, and 7blue Haro galaxies. A morphological study of 130 of the galaxiesindicates that about half are elliptical or lenticular, 50 are compactor peculiar, and that there is an excess of elliptical and lenticularobjects in comparison with a random sample. Notes on the morphologicaltypes and colors of the galaxies are provided along with identificationcharts.
|
Submit a new article
Related links
Submit a new link
Member of following groups:
|
Observation and Astrometry data
Catalogs and designations:
|
