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J/MNRAS/392/1403   GMRT radios sources around J0916+6348 field (Sirothia+, 2009)

Deep low-frequency observations with the Giant Metrewave Radio Telescope: a search for relic radio emission. Sirothia S.K., Saikia D.J., Ishwara-Chandra C.H., Kantharia N.G. <Mon. Not. R. Astron. Soc., 392, 1403-1412 (2009)> =2009MNRAS.392.1403S
ADC_Keywords: Radio sources ; Galaxies, radio Keywords: galaxies: active - galaxies: clusters: general - radio continuum: galaxies Abstract: We present deep multifrequency observations using the Giant Metrewave Radio Telescope (GMRT) at 153, 244, 610 and 1260MHz of a field centred on J0916+6348, to search for evidence of fossil radio lobes which could be due to an earlier cycle of episodic activity of the parent galaxy, as well as haloes and relics in clusters of galaxies. We do not find any unambiguous evidence of episodic activity in a list of 374 sources, suggesting that such activity is rare even in relatively deep low-frequency observations. We examine the spectra of all the sources by combining our observations with those from the Westerbork Northern Sky Survey (WENSS), NRAO (National Radio Astronomy Observatories) VLA (Very Large Array) Sky Survey (NVSS) and the Faint Images of the Radio Sky at Twenty-Centimeters Survey (FIRST). Description: Observations were made on 2005 December 12 at 153MHz, 2005 November 26 at 244MHz and 610MHz, and on 2008 April 22 at 1260MHz, on the Giant Metrewave Radio Telescope (Pune, India). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 96 317 The steep-spectrum sources with a spectral index steeper than 1.3
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [GMRT] 5- 17 A13 --- GMRT Source name (HHMMSS+DDMMSS) (1) 19- 20 I2 h RAh Right ascension (J2000) 22- 23 I2 min RAm Right ascension (J2000) 25- 28 F4.1 s RAs Right ascension (J2000) 30 A1 --- DE- Declination sign (J2000) 31- 32 I2 deg DEd Declination (J2000) 34- 35 I2 arcmin DEm Declination (J2000) 37- 40 F4.1 arcsec DEs [0/60] Declination (J2000) 42- 45 F4.2 deg Dist Distance of the centroid of the source in the 150MHz image from the pointing centre 47- 52 F6.1 mJy S153 Total flux density at 153MHz 54- 59 F6.1 mJy S244 Total flux density at 224MHz 61- 66 F6.1 mJy S330 ?=- Total flux density at 330MHz 68- 73 F6.1 mJy S610 ?=- Total flux density at 610MHz 75- 78 F4.1 mJy S1260 ?=- Total flux density at 1260MHz 80- 85 F6.1 mJy S1400 ?=- Total flux density at 1400MHz 87- 91 F5.2 --- SI ?=- Spectral index from a linear least-squares fit for which the spectrum could be satisfactorily fitted with a straight spectrum 93- 96 A4 --- Cl Structural classification (2)
Note (1): Sources identified as [SSI2009] JHHMMSS+DDMMSS in Simbad. Note (2): Class as follows: D = double-lobe source E = diffuse extended emission without a clear double-lobed structure S = single source T = triple source with a possible core component Cplx = complex source
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Aug-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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