J/MNRAS/387/1037 610-MHz survey of Lockman Hole with GMRT (Garn+, 2008)
A 610-MHz survey of the Lockman Hole with the Giant Metrewave Radio Telescope.
I. Observations, data reduction and source catalogue for the central 5 deg2.
Garn T., Green D.A., Riley J. M., Alexander P.
<Mon. Not. R. Astron. Soc. 387, 1037 (2008)>
=2008MNRAS.387.1037G 2008MNRAS.387.1037G
ADC_Keywords: Radio sources ; Surveys
Keywords: surveys - catalogues - radio continuum: galaxies
Abstract:
We present observations of the Lockman Hole with the Giant Metrewave
Radio Telescope (GMRT). Twelve pointings were observed, covering a
total area of ∼5deg2 with a resolution of 6x5arcsec2, position
angle +45deg. The majority of the pointings have an rms noise of
∼60uJy/beam before correction for the attenuation of the GMRT primary
beam. Techniques used for data reduction and production of a mosaicked
image of the region are described, and the final mosaic is presented,
along with a catalogue of 2845 sources detected above 6σ. Radio
source counts are calculated at 610-MHz and combined with existing
1.4-GHz source counts, in order to show that pure luminosity evolution
of the local radio luminosity functions for active galactic nuclei and
starburst galaxies is sufficient to account for the two source counts
simultaneously.
Description:
Observations were made in two 16-MHz sidebands centred on 610MHz, each
split into 128 spectral channels, with a 16.9s integration time.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 88 2845 GMRT LH sourcelist of 2845 sources
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See also:
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/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 : ISOCAM 14.3um Deep Survey in Lockman Hole (Rodighiero+, 2004)
J/AJ/128/1501 : CLASXS: X-ray catalog (Yang+, 2004)
J/MNRAS/371/963 : Deep VLA survey in Lockman Hole, HDFN, ELAIS N2 (Biggs+ 2006)
J/A+A/473/105 : Lockman Hole AGN variability with XMM (Mateos+, 2007)
J/A+A/479/283 : XMM observations of the Lockman Hole (Brunner+, 2008)
J/MNRAS/383/75 : Deep 610MHz survey of ELAIS-N1 sources (Garn+, 2008)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- --- [GMRTLH_]
8- 23 A16 --- GMRTLH IAU designation of source (JHHMMSS.s+DDMMSS)
25- 26 I2 h RAh Centroid position right ascension J2000
27 A1 --- --- [:]
28- 29 I2 min RAm Centroid position right ascension J2000
30 A1 --- --- [:]
31- 35 F5.2 s RAs Centroid position right ascension J2000
37 A1 - DE- Centroid position declination (sign)
38- 39 I2 deg DEd Centroid position declination J2000
40 A1 --- --- [:]
41- 42 I2 arcmin DEm Centroid position declination J2000
43 A1 --- --- [:]
44- 47 F4.1 arcsec DEs Centroid position declination J2000
49- 55 F7.3 mJy S Peak pixel brightness (in mJy/beam)
57- 60 I4 uJy Noise Local rms noise (in uJy/beam)
62- 69 F8.3 mJy Sint Integrated flux at 610MHz
71- 76 F6.3 mJy e_Sint Error on integrated flux
78- 81 I4 --- Xpos Centroid X pixel location (nearest pixel)
83- 86 I4 --- Ypos Centroid Y pixel location (nearest pixel)
88 I1 --- Flags [0/3] Source Extractor flags (1)
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Note (1): Source SExtractor flags as follows:
1 = where a nearby bright source may be affecting the calculated flux
2 = where a source has been deblended into two or more components
from a single initial island of flux
3 = when both 1 and 2 apply
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Acknowledgements:
Timothy Garn, tsg25(at)cam.ac.uk
(End) Timothy Garn [MRAO], Patricia Vannier [CDS] 16-Jun-2008