VLA imaging of the XMM-LSS/VIDEO deep field at 1–2 GHz
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Date
2020-06-20
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Publisher
Oxford University Press
Abstract
Modern radio telescopes are routinely reaching depths where normal star-forming galaxies are
the dominant observed population. Realizing the potential of radio as a tracer of star formation
and black hole activity over cosmic time involves achieving such depths over representative
volumes, with radio forming part of a larger multiwavelength campaign. In pursuit of this, we
used the Karl G. Jansky Very Large Array (VLA) to image ∼5 deg2 of the VIDEO/XMM-LSS
extragalactic deep field at 1–2 GHz. We achieve a median depth of 16 μJy beam−1 with an
angular resolution of 4.5 arcsec. Comparisons with existing radio observations of XMM-LSS
showcase the improved survey speed of the upgraded VLA: we cover 2.5 times the area and
increase the depth by ∼20 per cent in 40 per cent of the time. Direction-dependent calibration
and wide-field imaging were required to suppress the error patterns from off-axis sources
of even modest brightness. We derive a catalogue containing 5762 sources from the final
mosaic. Sub-band imaging provides in-band spectral indices for 3458 (60 per cent) sources,
with the average spectrum becoming flatter than the canonical synchrotron slope below 1 mJy.
Positional and flux density accuracy of the observations, and the differential source counts are
in excellent agreement with those of existing measurements. A public release of the images
and catalogue accompanies this article.
Description
Keywords
radio continuum, techniques: interferometric, galaxies
Citation
Jarvis, M; et al. 2020. VLA imaging of the XMM-LSS/VIDEO deep field at 1–2 GHz. Monthly Notices of the Royal Astronomical Society. 496(3):3469-3481