Yang, AY and Dzib, SA and Urquhart, JS and Brunthaler, A and Medina, S-NX and Menten, KM and Wyrowski, F and Ortiz-León, GN and Cotton, WD and Gong, Y and Dokara, R and Rugel, MR and Beuther, H and Pandian, JD and Csengeri, T and Veena, VS and Roy, N and Nguyen, H and Winkel, B and Ott, J and Carrasco-Gonzalez, C and Khan, S and Cheema, A (2023) A global view on star formation: The GLOSTAR Galactic plane survey IX. Radio Source Catalog III: 2° < l < 28°, 36° < l < 40°, 56° < l < 60° and |b| < 1°, VLA B-configuration. In: Astronomy and Astrophysics, 680 .
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Abstract
As part of the GLObal view of STAR formation in the Milky Way (GLOSTAR) survey, we present the high-resolution continuum source catalog for the regions (l = 2° -28°, 36° -40°, 56° -60°, and |b| < 1.0°), observed with the Karl G. Jansky Very Large Array (VLA) in its B-configuration. The continuum images were optimized to detect compact sources on angular scales up to 4�, and have a typical noise level of 1� ~ 0.08 mJy beam-1 for an angular resolution of 1�, which makes GLOSTAR currently the highest resolution as well as the most sensitive radio survey of the northern Galactic plane at 4-8 GHz. We extracted 13354 sources above a threshold of 5� and 5437 sources above 7� that represent the high-reliability catalog. We determined the in-band spectral index (α) for the sources in the 7�-threshold catalog. The mean value is α = -0.6, which indicates that the catalog is dominated by sources emitting nonthermal radio emission. We identified the most common source types detected in radio surveys: 251 H II region candidates (113 new), 282 planetary nebulae (PNe) candidates (127 new), 784 radio star candidates (581 new), and 4080 extragalactic radio source candidates (2175 new). A significant fraction of H II regions and PNe candidates have α < -0.1 indicating that these candidates could contain radio jets, winds or outflows from high-mass and low-mass stellar objects. We identified 245 variable radio sources by comparing the flux densities of compact sources from the GLOSTAR survey and the Co-Ordinated Radio �N� Infrared Survey for High-mass star formation (CORNISH), and find that most of them are infrared quiet. The catalog is typically 95 complete for point sources at a flux density of 0.6 mJy (i.e., a typical 7� level) and the systematic positional uncertainty is � 0�.1. © The Authors 2023.
| Item Type: | Journal Article |
|---|---|
| Publication: | Astronomy and Astrophysics |
| Publisher: | EDP Sciences |
| Additional Information: | The copyright for this article belongs to author |
| Keywords: | Galaxies; Giant stars; Radio, Catalog; Compact sources; Global view; High resolution; HII region; Radio continuum: general; Radio sources; Stars formation; Technique: interferometric; Very large arrays, Radio astronomy |
| Department/Centre: | Others |
| Date Deposited: | 01 Mar 2024 09:58 |
| Last Modified: | 01 Mar 2024 09:58 |
| URI: | https://eprints.iisc.ac.in/id/eprint/84024 |
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