LOFAR/H-ATLAS: a deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field
Journal article, 2016

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 142 deg(2) of sky in the frequency range 126-173 MHz, 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 (similar to 10 x 6 arcsec) and an rms off-source noise that ranges from 100 mu Jy beam(-1) in the centre of the best fields to around 2 mJy beam(-1) 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 5 sigma 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 150 MHz, 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.

forming galaxies

function

infrared

star-formation history

less-than 1.0

galaxies

active

luminosity

galaxies

sky survey

radio continuum

sdss-iii

wide-field

mass-selected galaxies

galaxies

science

infrared-radio correlation

demonstration phase

Author

M. J. Hardcastle

University of Hertfordshire

G. Gurkan

University of Hertfordshire

R. J. van Weeren

Harvard-Smithsonian Center for Astrophysics

W. L. Williams

University of Hertfordshire

P. N. Best

Royal Observatory

F. De Gasperin

Leiden University

D. Rafferty

Universität Hamburg

S. C. Read

University of Hertfordshire

J. Sabater

Royal Observatory

T. W. Shimwell

Leiden University

D. J. B. Smith

University of Hertfordshire

C. Tasse

Paris Diderot University

N. Bourne

Royal Observatory

M. Brienza

University of Groningen

Netherlands Institute for Radio Astronomy (ASTRON)

M. Brüggen

Universität Hamburg

G. Brunetti

INAF OAS Bologna

K.T. Chyz̊y

Jagiellonian University in Kraków

John Conway

Chalmers, Earth and Space Sciences, Onsala Space Observatory

L. Dunne

Cardiff University

Royal Observatory

S. Eales

Jagiellonian University in Kraków

S. J. Maddox

Cardiff University

Royal Observatory

M. J. Jarvis

University of Oxford

University of the Western Cape

E. Mahony

The University of Sydney

ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)

R. Morganti

University of Groningen

Netherlands Institute for Radio Astronomy (ASTRON)

I. Prandoni

INAF OAS Bologna

H. Rottgering

Leiden University

E. Valiante

Cardiff University

G. J. White

Rutherford Appleton Laboratory

Open University

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 462 2 1910-1936

Infrastructure

Onsala Space Observatory

Subject Categories

Geophysics

DOI

10.1093/mnras/stw1763

More information

Latest update

4/4/2019 1