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VLA3701P4 - VLA A370 Cluster of Galaxies 1.4-GHz Source Catalog

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Overview

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 (S1.4GHz < 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.


Catalog Bibcode

2012ApJS..202....2W

References

Very Large Array 1.4 GHz catalogs of the A370 and A2390 cluster fields.
    Wold I.G.B., Owen F.N., Wang W.-H., Barger A.J., Keenan R.C.
   <Astrophys. J. Suppl. Ser., 202, 2 (2012)>
   =2012ApJS..202....2W

Provenance

This table was created by the HEASARC in August 2017 based on CDS Catalog J/ApJS/202/2/ 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 VLA23901P4 table.

Parameters

Source_Number
A unique identification number for each source in the catalog from 0 to 698.

Name
The preferred IAU source designation for the radio source using the '[WOW2012] A370' prefix recommended by the CDS Dictionary of Nomenclature of Celestial Objects and the source number value, e.g., '[WOW2012] A370 0'.

RA
The Right Ascension of the radio source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.01 seconds of time in the original table.

RA_Error
The uncertainty in the Right Ascension of the radio source, in arcseconds.

Dec
The Declination of the radio source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.01 arcseconds in the original table.

Dec_Error
The uncertainty in the Declination of the radio source, in arcseconds.

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

SNR_1p4_GHz
The peak 1.4-GHz signal-to-noise ratio (SNR) of the radio source.

Int_Flux_1p4_GHz
The total flux density of the radio source at 1.4 GHz, in mJy (converted by the HEASARC from the uJy units used in the original table).

Int_Flux_1p4_GHz_Error
The uncertainty in the total flux density of the radio source at 1.4 GHz, in mJy (converted by the HEASARC from the uJy units used in the original table).

Major_Axis
For resolved sources, the best-fit deconvolved Gaussian major axis (FWHM) of the radio source, in arcseconds.

Minor_Axis
For resolved sources, the best-fit deconvolved Gaussian minor axis (FWHM) of the radio source, in arcseconds.

Position_Angle
For resolved sources, the best-fit position angle of the major axis of the radio source, in degrees

Size_Constraint
This parameter is the major axis upper limit, in arcseconds, for unresolved sources, or the maximum size, in arcseconds, for very resolved sources.

Beam_Size
The beam size (resolution) of the image used in the source extraction, in arcseconds.

Redshift
The spectroscopic redshift of the radio source. 200 of the 699 sources have known redshifts.

Ref_Redshift
The reference code for the source of the spectroscopic redshift, as follows:

      1 = L. Cowie, private communication;
      2 = F. Owen, private communication;
      3 = Keenan et al. 2012, Submitted;
      4 = Dunlop et al. 1989, MNRAS, 238, 1171;
      5 = Wold et al. 2012, ApJS, 202, 2 (this paper).
  

Contact Person

Questions regarding the VLA3701P4 database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 8-Aug-2017