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Characterization of unresolved and unclassified sources detected in radio continuum surveys of the Galactic plane

Chakraborty, Arnab, Roy, Nirupam, Wang, Y., Datta, Abhirup, Beuther, H., Medina, S.-N. X., Menten, K.M., Urquhart, J.S., Brunthaler, A., Dzib, S.A. and others. (2020) Characterization of unresolved and unclassified sources detected in radio continuum surveys of the Galactic plane. Monthly Notices of the Royal Astronomical Society, 492 (2). pp. 2236-2240. ISSN 0035-8711. (doi:10.1093/mnras/stz3621) (KAR id:79399)

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http://dx.doi.org/10.1093/mnras/stz3621

Abstract

The continuum emission from 1 to 2 GHz of The HI/OH/Recombination line survey of the inner Milky Way (THOR) at < 18 resolution covers ∼ 132 square degrees of the Galactic plane and detects 10387 sources. Similarly, the first data release of the Global View of Star Formation in the Milky Way (GLOSTAR) surveys covers ∼ 16 square degrees of the Galactic plane from 4-8 GHz at 18 resolution and detects 1575 sources. However, a large fraction of the unresolved discrete sources detected in these radio continuum surveys of the Galactic plane remain unclassified. Here, we study the Euclidean-normalized di˙erential source counts of unclassified and unresolved sources detected in these surveys and compare them with simulated extragalactic radio source populations as well as previously established source counts. We find that the di˙erential source counts for THOR and GLOSTAR surveys are in excellent agreement with both simulation and previous observations. We also estimate the angular two-point correlation function of unclassified and unresolved sources detected in THOR survey. We find a higher clustering amplitude in comparison with the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey up to the angular separation of 5◦. The decrease in angular correlation with increasing flux cut and the excellent agreement of clustering pattern of sources above 1 mJy with high z samples (z > 0.5) of the FIRST survey indicates that these sources might be high z extragalactic compact objects. The similar pattern of one-point and two-point statistics of unclassified and compact sources with extragalactic surveys and simulations confirms the extragalactic origin of these sources.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stz3621
Uncontrolled keywords: radio continuum, general, galaxies surveys, School of Physical Sciences
Subjects: Q Science > QB Astronomy
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 02 Jan 2020 10:29 UTC
Last Modified: 07 May 2020 10:16 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/79399 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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