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GCPS - Galactic Center P-Band (330 MHz) Survey

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Overview

The Galactic Center P-Band (330 MHz) Survey (GCPS) is based on wide-field, subarcminute-resolution Very Large Array (VLA) imagery of the Galactic center region at 330 MHz. With a resolution of ~7"x12" and an rms noise of 1.6 mJy/beam, this image represented a significant increase in resolution and sensitivity over the previously published VLA image at this frequency. The improved sensitivity more than tripled the census of small-diameter sources in the region, resulted in the detection of two new nonthermal filaments (NTFs), 18 NTF candidates, and 30 pulsar candidates, revealed previously known extended sources in greater detail, and has resulted in the first detection of Sagittarius A* in this frequency range.

Two sets of observations were obtained. The first was conducted at 330 MHz in the A configuration of the VLA in 1996 October. The second set of P-band observations were obtained in the A and B configurations of the VLA between 1998 March and 1999 May.


Catalog Bibcode

2004AJ....128.1646N

References

High-resolution, wide-field imaging of the Galactic Center region at 330 MHz.
    Nord M.E., Lazio T.J.W., Kassim N.E., Hyman S.D., Larosa T.N., Brogan C.L.,
    Duric N.
   <Astron. J., 128, 1646-1670 (2004)>
   =2004AJ....128.1646N    (SIMBAD/NED BibCode)

Provenance

This Browse table was created by the HEASARC in May 2005 based on the CDS Catalog J/AJ/128/1646, tables table2.dat and table3.dat.

Parameters

Sequence_Number
This is a sequence number in order of increasing galactic longitude of the source, starting from the first source at 357.796 degrees and ending with a source at 2.186 degrees.

Name
The recommended GCPS source designation, using the prefix 'GCPS' and the galactic coordinates to a precision of 0.001 degrees.

Name_Flag
This flag is set to 'b' to indicate that the source is transient (see Hyman et al. 2002AJ....123.1497H).

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

Dec
The Declination of the radio source. This was given in J2000 coordinates and to a precision of 0.1 arcseconds in the original table.

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

Flux_91_cm
The maximum intensity of the radio source at 330 MHz, in units of milliJanskies per beam (mJy/beam), where the FWHM of the beam is 12.58" by 6.81".

Flux_91_cm_Error
The rms of the image in the region local to the source, in units of milliJanskies per beam (mJy/beam).

Int_Flux_91_cm
The (integrated) flux density of the radio source at 330 MHz, in milliJanskies (mJy).

Angular_Diameter
The arithmetic mean of the deconvolved major and minor axes, in arcseconds.

Source_Offset
The offset of the source from the phase center, which has a J2000 position of (17 45 40.045, -29 00 27.900), in arcminutes.

Comments
Additional SIMBAD information pertaining to source matches within 1 arcminute of the GCPS radio source position. Note that stellar matches were neglected, and that other radio source matches are listed as the parameters alt_name_1, alt_name_2 and alt_name_3. The following acronyms are used:

      PSR  = Pulsar;
      IRAS = IRAS infrared source;
      YSO  = Young stellar object;
      X    = X-ray object;
      PN   = Planetary nebula;
      PN?  = Possible planetary nebula;
      IR   = Isogal infrared source;
      XRB  = X-ray binary;
      H II = H II region;
      OPC  = Open cluster;
      MC   = Molecular cloud;
      SY1  = Seyfert 1 galaxy.
  

Alt_Name_1
The GPSR Catalog (Zoonematkermani et al. 1990, ApJS, 74, 181; Hlefand et al. 1992, ApJS, 80, 211) 1.4 GHz counterpart to the GCPS source. Sources were considered as matches if their stated location agreed with that of the GCPS source to within 15 arcseconds.

Spect_Index_1
The 1.4 - 0.33 GHz spectral index (SI) of the radio source, using the GPSR cross-identification, where S_nu ~ Nu^SI, S_nu is the flux density and nu is the frequency.

Alt_Name_2
The 2LC Catalog (Lazio and Cordes 2004, in preparation) 1.4 GHz counterpart to the GCPS source. Sources were considered a match if their stated location agreed with that of the GCPS source to within 15 arcseconds.

Spect_Index_2
The 1.4 - 0.33 GHz spectral index (SI) of the radio source, using the 2LC cross-identification, where S_nu ~ Nu^SI, S_nu is the flux density and nu is the frequency.

Alt_Name_3
The GPSR5 Catalog (Becker et al. 1994, ApJS, 91, 347) 5 GHz counterpart to the GCPS source. Sources were considered a match if their stated location matched that of the GCPS source to within 15 arcseconds.

Spect_Index_3
The 5 - 0.33 GHz spectral index (SI) of the radio source, using the GPSR5 cross-identification, where S_nu ~ Nu^SI, S_nu is the flux density and nu is the frequency.


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 13-May-2005