Deep multi-frequency radio imaging in the Lockman Hole using the GMRT and VLA. I. The nature of the sub-mJy radio population. (2009)
Keywords :
techniques interferometric - galaxies: evolution - galaxies: starburst - radio continuum: galaxies
Abstract:In the run up to routine observations with the upcoming generation of radio facilities, the nature of sub-mJy radio population has been hotly debated. Here, we describe multi-frequency data designed to probe the emission mechanism that dominates in these faint radio sources. Our analysis is based on observations of the Lockman Hole using the Giant Metrewave Radio Telescope (GMRT) - the deepest 610-MHz imaging yet reported - together with 1.4-GHz imaging from the Very Large Array (VLA), well matched in resolution and sensitivity to the GMRT data: {sigma}_610_MHz~15uJy/beam, {sigma}_1.4GHz_~6uJy/beam, full width at half-maximum (FWHM) ~5arcsec. The GMRT and VLA data are cross-matched to obtain the radio spectral
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During six 12-hr sessions in 2006 February and July, we obtained data
at 610MHz for three pointings (FWHM~43-arcmin) in the LH (see Table
1), separated by 11-arcmin (lockman-e, lock-3, lhex4), typically with
28 of the 30 antennas that comprise the GMRT near Pune, India. The
total integration time in each field, after overheads, was 16hr.
New and archival data were obtained in the same three positions using
the National Radio Astronomy Observatory's (NRAO2) VLA, largely in its
B configuration.
- J/A+A/329/482 : ROSAT Deep Survey in the Lockman Hole (Hasinger+, 1998)
- J/PASJ/53/445 : ASCA Deep survey in Lockman Hole Field (Ishisaki+, 2001)
- J/A+A/393/425 : Spectral analysis of Lockman Hole (Mainieri+, 2002)
- J/A+A/398/901 : VLA survey at 6 cm in the Lockman Hole (Ciliegi+, 2003)
- J/AJ/125/2521 : 2MASS6x survey of the Lockman Hole (Beichman+, 2003)
- J/AJ/128/1501 : CLASXS
- J/A+A/413/843 : Far IR survey in the Lockman Hole (Kawara+, 2004)
- J/A+A/427/23 : 14.3um survey in the Lockman Hole (Fadda+, 2004)
- J/A+A/427/773 : Lockman Hole ISOCAM 14.3{mu}m Deep Survey (Rodighiero+ 2004)
- J/A+A/434/801 : X-ray sources near Lockman Hole (Zappacosta+, 2005)
- J/A+A/444/79 : Lockman Hole brightest AGNs XMM observations (Mateos+, 2005)
- J/A+A/473/105 : Lockman Hole AGN variability with XMM (Mateos+, 2007)
- J/MNRAS/371/963 : Deep VLA survey in LH, HDFN, ELAIS N2 (Biggs+, 2007)
- J/A+A/487/475 : X-ray variability of AGNs in Lockman Hole (Papadakis+, 2008)
- J/A+A/479/283 : XMM observations of the Lockman Hole (Brunner+, 2008)
- J/MNRAS/387/1037 : 610-MHz survey of Lockman Hole with GMRT (Garn+, 2008)
- J/ApJS/185/433 : SWIRE/Chandra survey in Lockman Hole Field (Wilkes+, 2009)
