A global view on star formation: The GLOSTAR Galactic plane survey X. Galactic HII region catalog using radio recombination lines

Fuente: arXiv

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Bibliographic Details
Main Authors:	Khan, S., Rugel, M. R., Brunthaler, A., Menten, K. M., Wyrowski, F., Urquhart, J. S., Gong, Y., Yang, A. Y., Nguyen, H., Dokara, R., Dzib, S. A., Medina, S. -N. X., Ortiz-León, G. N., Pandian, J. D., Beuther, H., Veena, V. S., Neupane, S., Cheema, A., Reich, W., Roy, N.
Format:	Preprint
Published:	2024
Subjects:	Astrophysics of Galaxies
Online Access:	Acceder al recurso
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_version_	1866913490257575936
author	Khan, S. Rugel, M. R. Brunthaler, A. Menten, K. M. Wyrowski, F. Urquhart, J. S. Gong, Y. Yang, A. Y. Nguyen, H. Dokara, R. Dzib, S. A. Medina, S. -N. X. Ortiz-León, G. N. Pandian, J. D. Beuther, H. Veena, V. S. Neupane, S. Cheema, A. Reich, W. Roy, N.
author_facet	Khan, S. Rugel, M. R. Brunthaler, A. Menten, K. M. Wyrowski, F. Urquhart, J. S. Gong, Y. Yang, A. Y. Nguyen, H. Dokara, R. Dzib, S. A. Medina, S. -N. X. Ortiz-León, G. N. Pandian, J. D. Beuther, H. Veena, V. S. Neupane, S. Cheema, A. Reich, W. Roy, N.
contents	Studies of Galactic HII 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 1σ {\sim} 3.0 mJy beam{^-1} at {\sim} 5 km s{^-1} and an angular resolution of 25", we cataloged 244 individual Galactic HII regions and derived their physical properties. We examined the mid-infrared (MIR) morphology of these HII 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 HII regions, respectively, are coextensive with those. We measured the electron temperature for a large sample of HII regions within Galactocentric distances spanning from 1.6 to 13.1 kpc and derived the Galactic electron temperature gradient as {\sim} 372 {\pm} 28 K kpc{^-1} with an intercept of 4248 {\pm} 161 K, which is consistent with previous studies.
format	Preprint
id	arxiv_https___arxiv_org_abs_2407_05770
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	A global view on star formation: The GLOSTAR Galactic plane survey X. Galactic HII region catalog using radio recombination lines Khan, S. Rugel, M. R. Brunthaler, A. Menten, K. M. Wyrowski, F. Urquhart, J. S. Gong, Y. Yang, A. Y. Nguyen, H. Dokara, R. Dzib, S. A. Medina, S. -N. X. Ortiz-León, G. N. Pandian, J. D. Beuther, H. Veena, V. S. Neupane, S. Cheema, A. Reich, W. Roy, N. Astrophysics of Galaxies Studies of Galactic HII 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 1σ {\sim} 3.0 mJy beam{^-1} at {\sim} 5 km s{^-1} and an angular resolution of 25", we cataloged 244 individual Galactic HII regions and derived their physical properties. We examined the mid-infrared (MIR) morphology of these HII 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 HII regions, respectively, are coextensive with those. We measured the electron temperature for a large sample of HII regions within Galactocentric distances spanning from 1.6 to 13.1 kpc and derived the Galactic electron temperature gradient as {\sim} 372 {\pm} 28 K kpc{^-1} with an intercept of 4248 {\pm} 161 K, which is consistent with previous studies.
title	A global view on star formation: The GLOSTAR Galactic plane survey X. Galactic HII region catalog using radio recombination lines
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2407.05770