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Low-frequency radio...
Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole
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- Ramasawmy, J. (author)
- University of Hertfordshire
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- Geach, J.E. (author)
- University of Hertfordshire
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- Hardcastle, M. J. (author)
- University of Hertfordshire
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- Best, P. N. (author)
- Royal Observatory
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- Bonato, M. (author)
- Istituto di Radioastronomia,Istituto nazionale di astrofisica (INAF)
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- Bondi, M. (author)
- Istituto di Radioastronomia
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- Calistro Rivera, G. (author)
- European Southern Observatory (ESO)
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- Cochrane, R. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Conway, John, 1963 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Coppin, K. E. K. (author)
- University of Hertfordshire
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- Duncan, K. J. (author)
- Universiteit Leiden (UL),Leiden University (UL),Royal Observatory
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- Dunlop, J. S. (author)
- Royal Observatory
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- Franco, M. (author)
- University of Hertfordshire
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- García-Vergara, C. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Jarvis, M. J. (author)
- University of the Western Cape
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- Kondapally, R. (author)
- Royal Observatory
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- McCheyne, I. (author)
- University of Sussex
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- Prandoni, I. (author)
- Istituto di Radioastronomia
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- Rottgering, H. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Smith, D. J.B. (author)
- University of Hertfordshire
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- Tasse, C. (author)
- Observatoire de Paris-Meudon,Station de Radioastronomie de Nançay,Rhodes University
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- Wang, L. (author)
- Netherlands Institute for Space Research (SRON),Rijksuniversiteit Groningen,University of Groningen
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(creator_code:org_t)
- 2021-04-19
- 2021
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 648
- Related links:
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http://uhra.herts.ac...
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https://doi.org/10.1...
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Abstract
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- Aims. We investigate the radio properties of a sample of 850 μm-selected sources from the SCUBA-2 Cosmology Legacy Survey (S2CLS) using new deep, low-frequency radio imaging of the Lockman Hole field from the Low Frequency Array. This sample consists of 53 sources, 41 of which are detected at >5σ at 150 MHz. Methods. Combining these data with additional observations at 324 MHz, 610 MHz, and 1.4 GHz from the Giant Metrewave Radio Telescope and the Jansky Very Large Array, we find a variety of radio spectral shapes and luminosities (L1.4 GHz ranging from ∼4 × 1023-1 × 1025) within our sample despite their similarly bright submillimetre flux densities (>4 mJy). We characterise their spectral shapes in terms of multi-band radio spectral indices. Finding strong spectral flattening at low frequencies in ∼20% of sources, we investigate the differences between sources with extremely flat low-frequency spectra and those with 'normal' radio spectral indices (α > -0.25). Results. As there are no other statistically significant differences between the two subgroups of our sample as split by the radio spectral index, we suggest that any differences are undetectable in galaxy-averaged properties that we can observe with our unresolved images, and likely relate to galaxy properties that we cannot resolve, on scales 1 kpc. We attribute the observed spectral flattening in the radio to free-free absorption, proposing that those sources with significant low-frequency spectral flattening have a clumpy distribution of star-forming gas. We estimate an average spatial extent of absorbing material of at most several hundred parsecs to produce the levels of absorption observed in the radio spectra. This estimate is consistent with the highest-resolution observations of submillimetre galaxies in the literature, which find examples of non-uniform dust distributions on scales of ∼100 pc, with evidence for clumps and knots in the interstellar medium. Additionally, we find two bright (>6 mJy) S2CLS sources undetected at all other wavelengths. We speculate that these objects may be very high redshift sources, likely residing at z > 4.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
Keyword
- Galaxies: starburst
- Galaxies: star formation
- Galaxies: high-redshift
- Galaxies: structure
- Submillimeter: galaxies
- Radio continuum: galaxies
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Ramasawmy, J.
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Geach, J.E.
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Hardcastle, M. J ...
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Best, P. N.
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Bonato, M.
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Bondi, M.
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Calistro Rivera, ...
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Cochrane, R.
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Conway, John, 19 ...
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Coppin, K. E. K.
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Duncan, K. J.
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Dunlop, J. S.
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Franco, M.
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García-Vergara, ...
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Jarvis, M. J.
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Kondapally, R.
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McCheyne, I.
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Prandoni, I.
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Rottgering, H.
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Smith, D. J.B.
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Tasse, C.
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Wang, L.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Chalmers University of Technology