Upload your image
DSS Images Other Images
Submit a new article
|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.
|The current optical identification status of the S5 radio source catalogue.|
Optical identifications, magnitudes, and redshifts have been compiledfor the 185 radio sources of the S5 catalogue, representing its currentoptical identification status. Reliable optical counterparts are foundfor more than 75% of the sources, nearly 50% of which have measuredredshifts. Our tabulation also includes radio positions, radio fluxes,and radio spectral indices. References to other catalogues and detailedsupplementary notes are given for a large fraction of the sources.
|Spectroscopic observations of radio source identifications from the 1 Jy, S4 and S5 Surveys. III|
Optical spectra are presented for the optical counterparts of 21 radiosources taken from the 1 Jy, S4, and S5 radio source catalogues. Newredshifts are given for 18 sources, including a radio-selected quasarwith a redshift of 3.886. For two other sources, redshifts hadpreviously been listed in other publications and were confirmed by thenew observations. One radio source is confirmed as a BL Lac objectshowing a featureless spectrum. For several sources, additional directimaging data are provided.
|UGC galaxies stronger than 25 mJy at 4.85 GHz|
UGC galaxies in the declination band +5 to +75 deg were identified byposition coincidence with radio sources stronger than 25 mJy on theGreen Bank 4.85 GHz sky maps. Candidate identifications were confirmedor rejected with the aid of published aperture-synthesis maps and new4.86 GHz VLA maps having 15 or 18 arcsec resolution, resulting in asample of 347 nearby radio galaxies plus five new quasar-galaxy pairs.The radio energy sources in UGC galaxies were classified as 'starbursts'or 'monsters' on the basis of their infrared-radio flux ratios, infraredspectral indices, and radio morphologies. The rms scatter in thelogarithmic infrared-radio ratio q is not more than 0.16 for starburstgalaxies selected at 4.85 GHz. Radio spectral indices were obtained fornearly all of the UGC galaxies, and S0 galaxies account for adisproportionate share of the compact flat-spectrum (alpha less than0.5) radio sources. The extended radio jets and lobes produced bymonsters are preferentially, but not exclusively, aligned within about30 deg of the optical minor axes of their host galaxies. The tendencytoward minor-axis ejection appears to be independent of radio-sourcesize and is strongest for elliptical galaxies.
|Radio identifications of UGC galaxies - Starbursts and monsters|
New and previously published observational data on galaxies withdeclination less than +82 deg from the Uppsala General Catalog (Nilson,1973) are compiled in extensive tables and characterized in detail.Optical positions are confirmed by measurement of Palomar Sky Survey Oprints, and radio identifications for 176 galaxies are made on the basisof 1.4-GHz Green Bank sky maps or 1.49-GHz observations obtained withthe C configuration of the VLA in November-December 1986; contour mapsbased on the latter observations are provided. Radio-selected andIR-selected galaxy populations are found to be similar (and distinctfrom optically selected populations), and three radio/IR criteria aredeveloped to distinguish galaxies powered by starbursts from those withsupermassive black holes or other 'monster' energy sources.
|A pencil-beam survey of radio sources at 178 MHz|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1969MNRAS.145..181C&db_key=AST
|Identifications of radio sources with bright galaxies|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1967MNRAS.135..231C&db_key=AST
Submit a new link
Member of following groups:
Observation and Astrometry data
Catalogs and designations: