BOOF153MHZ - Bootes Field GMRT 153-MHz Source Catalog

Overview

The authors obtained deep, high-resolution radio interferometric observations at 153 MHz to complement the extensively studied NOAO Bootes field. In their paper, they provide a description of the observations, data reduction and source catalog construction. From their single-pointing GMRT observation of ~12 hours, they obtained a high-resolution (26" x 22") image of ~11.3 square degrees, fully covering the Bootes field region and beyond. The image has a central noise level of ~1.0 mJy beam^-1, which rises to 2.0 - 2.5 mJy beam^-1 at the field edge, placing it amongst the deepest ~150 MHz surveys to date. The catalog of 598 extracted sources is estimated to be ~92% complete for > 10 mJy sources, while the estimated contamination by false detections is < 1%. The low rms positional uncertainty of 1.24" facilitates accurate matching against catalogs at optical, infrared and other wavelengths. Differential source counts were determined down to < ~10 mJy. The authors find no evidence for flattening of the counts towards lower flux densities as observed in deep radio surveys at higher frequencies, suggesting that their catalog is dominated by the classical radio-loud AGN population that explains the counts at higher flux densities. Combination with available deep 1.4 GHz observations yields an accurate determination of spectral indices for 417 sources down to the lowest 153 MHz flux densities, of which 16 have ultra-steep spectra with spectral indices below -1.3. The authors confirm that flattening of the median spectral index towards low flux densities also occurs at this frequency. The detection fraction of the radio sources in the NIR K_s-band is found to drop with radio spectral index, which is in agreement with the known correlation between spectral index and redshift for brighter radio sources.

This table contains the list of 598 153-MHz sources detected in the GMRT observation and their properties at this frequency. There are a number of other tables of objects in the Bootes field made at other frequencies:

HEASARC Table | Title                                    | Reference

BOOTESDF      | 1.4GHz imaging of the Bootes field       | de Vries+ 2002,AJ,123,1784
LALABOOCXO    | LALA Bootes field X-ray source catalog   | Wang+ 2004,AJ,127,213
---           | Faint radio sources in NOAO Bootes field | Wrobel+ 2005,AJ,130,923
---           | 16um sources in the NOAO Bootes field    | Kasliwal+ 2005,ApJ,634,L1
XBOOTES       | X-ray survey of the NDWFS Bootes field   | Kenter+ 2005,ApJS,161,9
XBOOTESOID    | Optical counterparts in the NDWFS Bootes | Brand+ 2006,ApJ,64,140
              |    field                                 |

Catalog Bibcode

2011A&A...535A..38I

References

Deep low-frequency radio observations of the NOAO Bootes field.
I. Data reduction and catalog construction.
    Intema H.T., van Weeren R.J., Rottgering H.J.A., Lal D.V.
    <Astron. Astrophys. 535, A38 (2011)>
    =2011A&A...535A..38I        (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in December 2011 based on CDS Catalog J/A+A/535/A38 file table3.dat.

Parameters

Name
The radio source designation using the J2000.0 equatorial coordinates truncated to 1 second of time in RA and 1 arcsecond in Declination and the '[IVR2011]' prefix (for Intema, van Weeren, Roetgering 2011), e.g., '[IVR2011] JHHMMSS+DDMMSS'. This prefix was added by the HEASARC to the original source identifier 'JHHMMSS+DDMMSS' used in the reference paper following the precepts of the Dictionary of Nomenclature of Celestial Objects.

RA
The Right Ascension of the radio source centroid in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10^-5 degrees (0.036") in the original table.

Dec
The Declination of the radio source centroid in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10^-5 degrees (0.036") in the original table.

LII
The Galactic Longitude of the radio source centroid.

BII
The Galactic Latitude of the radio source centroid.

RA_Error
The 1-sigma rms uncertainty in the centroid position in the Right Ascension direction, in arcseconds.

Dec_Error
The 1-sigma rms uncertainty in the centroid position in the Declination direction, in arcseconds.

Flux_153_MHz
The integrated 153-MHz flux density of the radio source, in mJy.

Flux_153_MHz_Error
The 1-sigma uncertainty in the integrated 153-MHz flux density of the radio source, in mJy.

RMS_153_MHz
The local background rms noise level near the radio source, in mJy/beam.

Num_Gaussians
The number of Gaussian components which were fitted to the source.

Contact Person

Questions regarding the BOOF153MHZ database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:25:08 EDT