J/MNRAS/462/1910 H-ATLAS NGP LOFAR radio catalogue (Hardcastle+, 2016)
LOFAR/H-ATLAS: a deep low-frequency survey of the
Herschel-ATLAS North Galactic Pole field.
Hardcastle M.J., Gurkan G., van Weeren R.J., Williams W.L., Best P.N.,
de Gasperin F., Rafferty D.A., Read S.C., Sabater J., Shimwell T.W.,
Smith D.J.B., Tasse C., Bourne N., Brienza M., Bruggen M., Brunetti G.,
Chyzy K.T., Conway J., Dunne L., Eales S.A., Maddox S.J., Jarvis M.J.,
Mahony E.K., Morganti R., Prandoni I., Rottgering H.J.A., Valiante E.,
White G.J.
<Mon. Not. R. Astron. Soc., 462, 1910-1936 (2016)>
=2016MNRAS.462.1910H 2016MNRAS.462.1910H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Radio sources ; Morphology
Keywords: galaxies: active - infrared: galaxies - radio continuum: galaxies
Abstract:
We present Low-Frequency Array (LOFAR) High-Band Array observations of
the Herschel-ATLAS North Galactic Pole survey area. The survey we have
carried out, consisting of four pointings covering around 142deg2 of
sky in the frequency range 126-173MHz, does not provide uniform noise
coverage but otherwise is representative of the quality of data to be
expected in the planned LOFAR wide-area surveys, and has been reduced
using recently developed 'facet calibration' methods at a resolution
approaching the full resolution of the data sets (∼10x6 arcsec) and an
rms off-source noise that ranges from 100µJy beam-1 in the centre
of the best fields to around 2mJy/beam at the furthest extent of our
imaging. We describe the imaging, cataloguing and source
identification processes, and present some initial science results
based on a 5σ source catalogue. These include (i) an initial
look at the radio/far-infrared correlation at 150 MHz, showing that
many Herschel sources are not yet detected by LOFAR; (ii) number
counts at 150MHz, including, for the first time, observational
constraints on the numbers of star-forming galaxies; (iii) the 150-MHz
luminosity functions for active and star-forming galaxies, which agree
well with determinations at higher frequencies at low redshift, and
show strong redshift evolution of the star-forming population; and
(iv) some discussion of the implications of our observations for
studies of radio galaxy life cycles.
Description:
The NGP field was observed in four separate pointings, chosen to
maximize sky covered, with the LOFAR HBA as part of the Surveys Key
Science project. Observations used the HBADUALINNER mode, meaning
that the station beams of core and remote stations roughly matched
each other and giving the widest possible field of view. The first
observation, which was made early on in LOFAR operations, was of
slightly longer duration (∼10h) than the others (∼8h).
International stations were included in some of the observations in
2014 but were not used in any of our analysis, which uses only the
Dutch array.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 327 15292 Radio catalogue
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See also:
VII/204 : Galaxy properties at NGP (Odewahn+ 1995)
VII/214 : APS Galaxies in the North Galactic Pole (Cabanela, 1999)
J/A+A/372/276 : Polarization catalogue for NGP area (Berdyugin+, 2001)
J/ApJS/99/391 : The CfA redshift survey: NGP +36 zone. (Huchra+ 1995)
J/ApJS/175/86 : NGP+30° zone galaxies I. (Petrosian+, 2008)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name IAU name of the radio source
(JHHMMSS.ss+DDMMSS.s)
21- 30 F10.6 deg RAdeg Source right ascension (J2000) (1)
32- 39 F8.6 deg e_RAdeg Nominal (statistic) error on RAdeg
41- 50 F10.6 deg DEdeg Source declination (J2000) (1)
52- 59 F8.6 deg e_DEdeg Nominal (statistic) error on DEdeg
61- 69 F9.6 Jy Ftot Total flux density at 150MHz (2)
71- 78 F8.6 Jy e_Ftot Error on Ftot
80- 86 F7.3 --- Sep ? Component separation (3)
88- 96 F9.6 Jy F130 Total flux density in the 130MHz spectral window
98-106 F9.6 Jy e_F130 []? Error on F130
108-116 F9.6 Jy F138 Total flux density in the 138MHz spectral window
118-126 F9.6 Jy e_F138 []? Error on F138
128-136 F9.6 Jy F146 Total flux density in the 146MHz spectral window
138-146 F9.6 Jy e_F146 []? Error on F146
148-156 F9.6 Jy F154 Total flux density in the 154MHz spectral window
158-166 F9.6 Jy e_F154 []? Error on F154
168-176 F9.6 Jy F161 Total flux density in the 161MHz spectral window
178-186 F9.6 Jy e_F161 []? Error on F161
188-196 F9.6 Jy F169 Total flux density in the 169MHz spectral window
198-206 F9.6 Jy e_F169 []? Error on F169
208-215 A8 --- Class Classificiation, Single for a single PYBDSM
source, Multiple for a composite source
217 I1 --- Ncomp ? Number of components (4)
219-226 F8.6 deg Maj ? Major axis of the best-fitting elliptical
Gaussian fitted by PYBDSM
228-235 F8.6 deg e_Maj ? Error on Maj
237-244 F8.6 deg Min ? Minor axis of the best-fitting elliptical
Gaussian fitted by PYBDSM
246-253 F8.6 deg e_Min ? Error on Min
255-264 F10.6 deg PA ? Position angle axis of the best-fitting
elliptical Gaussian fitted by PYBDSM
266-275 F10.6 deg e_PA ? Error on PA
277-284 F8.6 deg DCMaj ? Major axis after deconvolution of the
LOFAR beam
286-293 F8.6 deg e_DCMaj ? Error on DC Maj
295-302 F8.6 deg DCMin ? Minor axis after deconvolution of the
LOFAR beam
304-311 F8.6 deg e_DCMin ? Error on DCMin
313-319 F7.3 deg DCPA ? Position angle after deconvolution of the
LOFAR beam
321-327 F7.3 deg e_DCPA ? Error on DCPA
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Note (1): For a composite source, i.e. one created by associating more than one
PYBDSM component, these are the mean right ascension and declination of the
associated sources.
Note (2): for composite sources, the sum of the flux densities of all the
associated components
Note (3): For composite sources only, indicates the largest distance between the
positions of two components that were associated to make the source.
Note (4): the number of components used to make a source.
1 for a single source, >1 for a composite source.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 31-Jan-2018