J/AJ/98/419 J/AJ/98/419 Observed quantities from B3 sources M Vigotti G Grueff R Perley B G Clark A H Bridle Astron. J. 98 419 1989 1989AJ.....98..419V VIII/37 : The Third Bologna Survey (B3) Kron, 1986, Private communication Radio sources This catalog contains results of a large program of optical identifications of radio sources from the Third Bologna (B3) Catalog (Ficarra et al., 1985A&AS...59..255F, Cat.<VIII/37>). A homogeneous sample of 1103 radio sources, selected from the B3 catalog at 408 MHz and covering a flux density range from 2.0 to 0.1 Jy, has been mapped at 1465 MHz using the VLA at 15" resolution. Both positional and structural information have been derived and are presented here. Optical identifications have been attempted for all of the sources within the range of right ascension studied, using the Palomar Sky Survey prints, resulting in 354 proposed identifications. The RA range was restricted to exclude sky areas at low galactic latitude, because obscuration makes these unsuitable for optical identifications, and confusion makes them unsuitable for VLA snapshot-mode observations. Thus the samples were selected only from the RA intervals 23h-3h, 7h-15h. The number of rows of this table (1474) is larger than the number of sources (1103) because each radio component of multiple sources is listed as a separate line.

Name Name of source number=1 The IAU name is given in the name column. This was not given in the B3 Catalogue, and was obtained from the B3 position (hours, minutes, degrees, and tenths of degrees) adding a letter (a, b, etc.) in order of right ascension, in case of ambiguity. Note that this designation does not always match the new VLA position, although this happens rarely. In the case of physically connected multiple sources, a single name is given if they correspond to a single source in the B3 Catalogue; however, some sources listed separately in B3 happen to be parts of the same source (e.g. 0050+401, 0050+403, and 0050+402B) and in this case they retain their individual B3 names. --- Oname 3C or 4C name of source number=2 The othername column gives the 4C name. If the source is also in the 3CR Catalogue, the 3CR name is given instead. 3CR names are recognizable by the format (integer number, or at most one decimal digit), while 4C names are in the DD.NN format. Identification with a 4C source is sometimes ambiguous, as discussed in the B3 Catalogue. --- Sample Number of B3 sample which contained source number=3 This column indicates the source parent subsample. This number indicates inclusion in the sample as originally selected; for example, the physical double 0218+399(A+B) is listed as 0218+399A 1 0218+399B 2 since the respective B3 flux densities are 0.36 and 0.49 Jy, and the components were originally selected as parts of two different samples. The VLA map showed them to be part of the same source; consequently the total 408 MHz flux density is now listed as 0.85 Jy (S408 column) and in any subsequent analysis the source will be considered part of sample 3, 0.8..S..1.6 Jy. Another example is given by the following double source 0218+402(A+B); only one component (A) was originally included in sample 2 (although both components are separately listed in B3) since component B did not meet the selection criteria as given in the published paper. See the paper for full details. --- RAh Right Ascension (B1950) (hour) number=4 These columns give the B1950 position of the source (or component). When no source component was detected with the VLA, the f_S1465 column is marked with an '-' and the given position is from B3 (Ficarra et al. 1985A&AS...59..255F). h RAm Right Ascension (B1950) (min) min RAs Right Ascension (B1950) (sec) s DE- Declination sign (B1950) number=4 These columns give the B1950 position of the source (or component). When no source component was detected with the VLA, the f_S1465 column is marked with an '-' and the given position is from B3 (Ficarra et al. 1985A&AS...59..255F). --- DEd Declination (B1950) (deg) deg DEm Declination (B1950) (arcmin) arcmin DEs Declination (B1950) (arcsec) arcsec f_S1465 Flagged if flux is integrated or upper limit number=5 The f_S1465 column is marked with a "+" if the source (component) was resolved, and an integrated flux density is given. A '-' in the f_S1465 column indicates that the source component was not detected with the VLA and the given flux is an upper limit. For these sources, the listed position is from B3. The S1465 columns gives the source (or component) flux density at 1465 MHz in mJy. --- S1465 Flux density at 1465 MHz in mJy number=5 The f_S1465 column is marked with a "+" if the source (component) was resolved, and an integrated flux density is given. A '-' in the f_S1465 column indicates that the source component was not detected with the VLA and the given flux is an upper limit. For these sources, the listed position is from B3. The S1465 columns gives the source (or component) flux density at 1465 MHz in mJy. mJy MType Morphological classification of source number=6 This column gives a simple morphological classification of the radio structure, as follows: U unresolved, the synthesized beam is not appreciably broadened. R resolved, only one emission peak is present, but the source map or 'response' is wider than the antenna beam. D double source, two emission peaks are present and they appear to be physically related. T triple source, three peaks present and possibly related. The morphological classification is followed by the source's largest angular size (LAS), measured in arcseconds. U implies an (average) upper limit of 5 arcsec; R sources were given a size by measuring the largest HPBW, and deconvolving it with the antenna beam; for D and T sources the separation between the (outermost) components is given. --- S408 Flux density at 408 MHz in Jy number=7 This column gives the total 408 MHz flux density in Jy; generally it is taken from B3, but for extended, strong sources it has been remeasured integrating from the B3 map on the structure revealed by the VLA data. Jy Sp+Index Spectral index between 1465 and 408 MHz number=8 This column gives the spectral index, computed between 1465 and 408 MHz. For multiple sources, the 1465 MHz flux densities have been added. Alpha is defined in the sense S {prop.to} nu^(alpha)^. --- ID Proposed source identification (type) number=9 This column gives the proposed optical identification, as follows: G galaxy B starlike, blue object N starlike object of neutral color Note that the optical identification for multiple sources (e.g. type D or T) is ONLY given for the FIRST listed component, and omitted for all others. A question mark indicates an uncertain optical classification, it does *not* necessarily indicate an uncertain identification. An asterisk preceding the optical classification indicates that the identification was accepted even if it does not meet a uniform criterion of positional agreement (see the paper for details). Note that this column is three characters, with the optical identification being the second character. Thus, to search for all galaxies, one must search for all sources with a 'G' in this column --- f_z '*' if redshift is from the literature number=10 For galaxies, the redshift is given in the z column. If a spectroscopic redshift is available in the literature, the f_z column is marked with an asterisk (*). In this case the reference given in the ref column is to the redshift measurement. To estimate redshifts for those not available in the literature, the image size was measured and from it the redshift was inferred, following an established procedure for radio galaxies (Sandage (1972ApJ...178...25S); Grueff and Vigotti 1979A&AS...35..371G). The method has been recalibrated using spectroscopic redshifts available for 33 radio galaxies in our sample. Some of these are available in the literature, and many were measured by Kron (1986) as an optical follow-up of this program. --- z Estimated or measured redshift number=10 For galaxies, the redshift is given in the z column. If a spectroscopic redshift is available in the literature, the f_z column is marked with an asterisk (*). In this case the reference given in the ref column is to the redshift measurement. To estimate redshifts for those not available in the literature, the image size was measured and from it the redshift was inferred, following an established procedure for radio galaxies (Sandage (1972ApJ...178...25S); Grueff and Vigotti 1979A&AS...35..371G). The method has been recalibrated using spectroscopic redshifts available for 33 radio galaxies in our sample. Some of these are available in the literature, and many were measured by Kron (1986) as an optical follow-up of this program. --- Rmag Red magnitude number=11 For N and B objects, the red magnitude is given, except for some B objects, whose spectroscopic redshift from the literature is given. mag RAoh Optical position Right Ascension (B1950)(hour) h RAom Optical position Right Ascension (B1950)(min) min RAos Optical position Right Ascension (B1950)(sec) s DEo- Optical position Declination sign (B1950) number=12 Right ascension and declination of the optical object. --- DEod Optical position Declination (B1950) (deg) deg DEom Optical position Declination (B1950) (arcmin) arcmin DEos Optical position Declination (B1950) (arcsec) arcsec oRA Radio-optical RA offset number=13 These columns give the radio-minus-optical coordinates differences, in arcsec. arcsec oDE Radio-optical Dec offset number=13 These columns give the radio-minus-optical coordinates differences, in arcsec. arcsec pos_flg Flag indicating which radio position was adopted number=14 This column gives a single digit indicating, for multiple sources, the radio position adopted as follows: 1 first component 2 second component 3 third component 4 unweighted average position (midpoint) 5 weighted average position (radio centroid) --- r_ID Reference code number=15 This column gives a reference code number. For sources with a measured redshift, only the reference for the redshift is given; for 3CR sources, the reader is referred also to Spinrad et al. (1985PASP...97..932S). --- code reference code --- reftxt reference text --- Patricio Ortiz CDS 1999Mar30 UNKNOWN UNKNOWN "The catalogue was originally archived as A016 by H. Andernach (heinz@astro.ugto.mx) and the ADS documentation prepared in collaboration with Carolyn Stern Grant (stern@cfa.harvard.edu)." J_AJ_98_419.xml