VLA3701P4 ivo://nasa.heasarc/vla3701p4 NASA/GSFC HEASARC Wold et al. 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the 1.4-GHz source catalog for the field of the cluster of galaxies A370 as observed with the Very Large Array (VLA). This is one of the deepest radio images of a cluster field ever taken. The image covers an area of 40' x 40' with a synthesized beam of ~1.7" and a noise level of ~5.7 µJy (µJy) near the field center. The authors have cataloged 200 redshifts for the A370 field. In the reference paper, they construct differential number counts for the central regions (radius < 16') of this cluster, and find that the faint (S<sub>1.4GHz</sub> < 3 mJy) counts of A370 are roughly consistent with the highest blank field number counts. Their analyses indicate that the number counts are primarily from field radio galaxies. The authors suggest that the disagreement of their number counts for this cluster with those from a similarly deep observation of A2390 that was also presented in the reference paper can be largely attributed to cosmic variance. The authors observed the A370 cluster field with the VLA in the A configuration for ~42.4hr on-source during 1999 August and September. K. S. Dwarakanath observed A370 in the B configuration for ~18.4hr on-source during 1994 August and September. The field center is located at 02:39:32 -01:35:07 (J2000). This is offset by approximately 5 arcminutes from the cluster center at 02:39:50.5 -01:35:08. The authors also targeted 58 radio sources, in A370, that had no existing optical spectral data using the Hydra fiber spectrograph on the Wisconsin-Indiana-Yale-NOAO (WIYN) telescope (spectral window of ~4500 - 9500 Angstrom). They preferentially targeted optically bright galaxies, obtaining these data in a single two-hour pointing on 2012 January 20. Of the 58 targets, the authors obtained high-confidence redshifts for 36. This table was created by the HEASARC in August 2017 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/202/2/">CDS Catalog J/ApJS/202/2/</a> file table2.dat. This file contained 699 entries for sources detected at 1.4 GHz in the A370 field, as well as 524 entries for sources detected at 1.4 GHz in the A2390 field. Only the former are included in this HEASARC table, while the latter can be found in the HEASARC's <a href="vla23901p4.html">VLA23901P4</a> table. This is a service provided by NASA HEASARC . 2012ApJS..202....2W https://heasarc.gsfc.nasa.gov/W3Browse/all/vla3701p4.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=vla3701p4& GET text/xml 180 99999 true 39.56458333 -1.91743333 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=vla3701p4 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_vla3701p4&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0166666666666667 Radio public vla3701p4 VLA A370 Cluster of Galaxies 1.4-GHz Source Catalog source_number Sequential Identification Number for Each Source in the Catalog meta.id;src short nullable name Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable ra_error Error in Right Ascension arcsec stat.error;pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable dec_error Error in Declination arcsec stat.error;pos.eq.dec;meta.main double nullable snr_1p4_ghz Peak Signal-to-Noise Ratio stat.snr;phot.flux.density;em.radio.750-1500MHz double nullable int_flux_1p4_ghz Total Flux Density at 1.4 GHz mJy phot.flux.density;em.radio.750-1500MHz double nullable int_flux_1p4_ghz_error Error in Total Flux Density at 1.4 GHz mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable redshift Spectroscopic Redshift src.redshift double nullable major_axis Fitted Deconvolved Gaussian Major Axis FWHM arcsec phys.angSize.smajAxis double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable beam_size Map Beam Size arcsec phys.angSize double nullable minor_axis Fitted Deconvolved Gaussian Minor Axis FWHM arcsec phys.angSize.sminAxis double nullable position_angle Fitted Position Angle degree pos.posAng short nullable ref_redshift Reference Code for Spectroscopic Redshift meta.ref;src.redshift short nullable size_constraint Size Limit for Unresolved Sources or Maximum Size for Very Resolved Sources arcsec phys.angSize;stat.max double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable