LOFAR/H-ATLAS: a deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field
Artikel i vetenskaplig tidskrift, 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.

infrared-radio correlation

galaxies

forming galaxies

function

active

demonstration phase

mass-selected galaxies

science

sdss-iii

less-than 1.0

star-formation history

infrared

radio continuum

galaxies

luminosity

wide-field

sky survey

galaxies

Författare

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

Universiteit Leiden

D. Rafferty

Universität Hamburg

S. C. Read

University of Hertfordshire

J. Sabater

Royal Observatory

T. W. Shimwell

Universiteit Leiden

D. J. B. Smith

University of Hertfordshire

C. Tasse

Université Paris Diderot

N. Bourne

Royal Observatory

M. Brienza

Rijksuniversiteit Groningen

Netherlands Institute for Radio Astronomy (ASTRON)

M. Brüggen

Universität Hamburg

G. Brunetti

INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

K.T. Chyz̊y

Uniwersytet Jagiellonski w Krakowie

John Conway

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

L. Dunne

Royal Observatory

Cardiff University

S. Eales

Uniwersytet Jagiellonski w Krakowie

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

Rijksuniversiteit Groningen

Netherlands Institute for Radio Astronomy (ASTRON)

I. Prandoni

INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

H. Rottgering

Universiteit Leiden

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

Infrastruktur

Onsala rymdobservatorium

Ämneskategorier

Geofysik

DOI

10.1093/mnras/stw1763