Khan, S and Rugel, MR and Brunthaler, A and Menten, KM and Wyrowski, F and Urquhart, JS and Gong, Y and Yang, AY and Nguyen, H and Dokara, R and Dzib, SA and Medina, S-NX and Ortiz-León, GN and Pandian, JD and Beuther, H and Veena, VS and Neupane, S and Cheema, A and Reich, W and Roy, N (2024) A global view on star formation: The GLOSTAR Galactic plane survey: X. Galactic H II region catalog using radio recombination lines. In: Astronomy and Astrophysics, 689 .
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Abstract
Studies of Galactic H II regions are of crucial importance for studying star formation and the evolution of the interstellar medium. Gaining an insight into their physical characteristics contributes to a more comprehensive understanding of these phenomena. The GLOSTAR project aims to provide a GLObal view on STAR formation in the Milky Way by performing an unbiased and sensitive survey. This is achieved by using the extremely wideband (4�8 GHz) C-band receiver of the Karl G. Jansky Very Large Array and the Effelsberg 100 m telescope. Using radio recombination lines observed in the GLOSTAR survey with the VLA in D-configuration with a typical line sensitivity of 1s ~ 3.0 mJy beam-1 at ~5 km s-1 and an angular resolution of 25'', we cataloged 244 individual Galactic H II regions (�2 = l = 60 and |b| = 1 , and 76 = l = 83 and �1 = b = 2 ) and derived their physical properties. We examined the mid-infrared (MIR) morphology of these H II regions and find that a significant portion of them exhibit a bubble-like morphology in the GLIMPSE 8 µm emission. We also searched for associations with the dust continuum and sources of methanol maser emission, other tracers of young stellar objects, and find that 48 and 14 of our H II regions, respectively, are coextensive with those. We measured the electron temperature for a large sample of H II regions within Galactocentric distances spanning from 1.6 to 13.1 kpc and derived the Galactic electron temperature gradient as ~372 ± 28 K kpc-1 with an intercept of 4248 ± 161 K, which is consistent with previous studies. © 2024 EDP Sciences. All rights reserved.
| Item Type: | Journal Article |
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| Publication: | Astronomy and Astrophysics |
| Publisher: | EDP Sciences |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | Infrared devices; Thermal gradients, Catalog; Galactic plane surveys; Global view; H II regions; Instrumentation: interferometers; Interstellar medias; Milky ways; Physical characteristics; Radio Recombination Lines; Stars formation, Stars |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 25 Sep 2024 08:50 |
| Last Modified: | 25 Sep 2024 08:50 |
| URI: | http://eprints.iisc.ac.in/id/eprint/86260 |
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