J/ApJS/107/19 J/ApJS/107/19 MRC/1Jy Radio source survey. I. P J McCarthy V K Kapahi W Van Breugel S E Persson R Athreya C R Subrahmanya Astrophys. J. Suppl. Ser. 107 19 1996 1996ApJS..107...19M VIII/16 : Molonglo Reference Catalogue of Radio Sources (Large+ 1991) Galaxies, radio Magnitudes Redshifts galaxies: photometry quasars: general radio continuum: galaxies surveys This is the first in a series of papers discussing the properties of a complete set of radio sources selected near S408=1Jy. We present optical or infrared identifications for a sample of 452 radio galaxies. The sources were selected from the 408MHz Molonglo Reference Catalog, restricted only by flux density and position on the sky, as follows: S408>0.95Jy and -30<decl.(1950)<-20, and 9h20m<R.A.(1950)<14h4m or 20h20m<R.A.(1950)<6h14m. This complete sample, the MRC/1 Jy survey, contains 558 radio galaxies or quasars, of which six are occulted by bright stars or galaxies and two are multiple confused sources. Of the remaining 550 sources, 527, or 96%, are identified to an r magnitude of 25, and eight additional sources are identified to K=19. Of the 17 unocculted objects that remain unidentified, 15 are sources for which we have either poor radio maps or inadequate optical/IR images. This paper presents finding charts and astrometric positions for the 452 sources that are not identified as either quasars or BL Lacertae objects. Magnitudes in the r passband accurate to typically 0.1mag are given for 353 of the radio galaxy identifications. Redshifts for 268 of the galaxies are also listed; these have been derived from 450 spectroscopic observations. The radio observations, quasar and BL Lac identifications, spectroscopy, and near-IR images will be presented in subsequent papers in this series.

MRC Designation as in MRC <VIII/16> number=1 For sources noted as "Unidentified" we list the radio position as derived from either our VLA images or from the MRC when observations are not available. Positions listed to the nearest arcsecond of declination are all radio positions are are flagged 'R' in byte 34. The n_MRC suffix were assigned lower-case letters (a, b, c) in byte 10 for those MRC names which had no suffix in the original MRC. --- m_MRC Radio Multiplicity as in MRC number=1 For sources noted as "Unidentified" we list the radio position as derived from either our VLA images or from the MRC when observations are not available. Positions listed to the nearest arcsecond of declination are all radio positions are are flagged 'R' in byte 34. The n_MRC suffix were assigned lower-case letters (a, b, c) in byte 10 for those MRC names which had no suffix in the original MRC. --- n_MRC Optical Multiplicity number=1 For sources noted as "Unidentified" we list the radio position as derived from either our VLA images or from the MRC when observations are not available. Positions listed to the nearest arcsecond of declination are all radio positions are are flagged 'R' in byte 34. The n_MRC suffix were assigned lower-case letters (a, b, c) in byte 10 for those MRC names which had no suffix in the original MRC. --- RAh Right ascension (1950) number=1 For sources noted as "Unidentified" we list the radio position as derived from either our VLA images or from the MRC when observations are not available. Positions listed to the nearest arcsecond of declination are all radio positions are are flagged 'R' in byte 34. The n_MRC suffix were assigned lower-case letters (a, b, c) in byte 10 for those MRC names which had no suffix in the original MRC. h RAm Right ascension (1950) min RAs Right ascension (1950) s DE- Declination sign --- DEd Declination (1950) number=1 For sources noted as "Unidentified" we list the radio position as derived from either our VLA images or from the MRC when observations are not available. Positions listed to the nearest arcsecond of declination are all radio positions are are flagged 'R' in byte 34. The n_MRC suffix were assigned lower-case letters (a, b, c) in byte 10 for those MRC names which had no suffix in the original MRC. deg DEm Declination (1950) arcmin DEs Declination (1950) arcsec RadioPos 'R' indicates a radio position number=1 For sources noted as "Unidentified" we list the radio position as derived from either our VLA images or from the MRC when observations are not available. Positions listed to the nearest arcsecond of declination are all radio positions are are flagged 'R' in byte 34. The n_MRC suffix were assigned lower-case letters (a, b, c) in byte 10 for those MRC names which had no suffix in the original MRC. --- z Redshift --- u_z Uncertainty flag on z --- l_rmag Limit flag on rmag --- rmag r magnitude number=2 All of the magnitudes listed are measured in a 4" diameter aperture in the Thuan-Gunn r- band, even when the image shown in Fig.1 is in a different pass-band. mag u_rmag Uncertainty flag on rmag --- Filt Filter --- FOV Field of view codes number=4 Field of view (FOV) codes are as follow: 1 = 66"x66"(2.5m+TI), 2 = 87"x 87"(m+TI), 3 = 71"x71"(2.5m+IR), 4 = 170"x 170"(Sky Survey), 5 = 59"x 59"(2.5m+Tek No.1), 6 = 51"x 51"(2.5m+Tek No.2),7 = other. --- Run Run numbers number=3 The run numbers denoted by asterisks are IR imaging runs that will be described elsewhere. --- Note Note detailed in file notes.dat --- Rem Remark --- MRC MRC designation as in file table2.dat --- m_MRC Multiplicity index on MRC --- Text Text of the note --- James Marcout, Patricia Bauer CDS 1998Jan28We thank H. Andernach <heinz@astro.ugto.mx> for proofreading the table, and supplying the remarks in columns m_MRC and RadioPos UNKNOWN UNKNOWN Prepared via OCR at CDS (August 1997) J_ApJS_107_19.xml