A global view on star formation: The GLOSTAR Galactic plane survey: VI. Radio Source Catalog II: 28 < ℓ < 36 and | b | < 1, VLA B-configuration

被引：1

作者：

Dzib S.A. ^{[1
,2
]}

Yang A.Y. ^{[2
]}

Urquhart J.S. ^{[3
]}

Medina S.-N.X. ^{[2
,4
]}

Brunthaler A. ^{[2
]}

Menten K.M. ^{[2
]}

Wyrowski F. ^{[2
]}

Cotton W.D. ^{[5
]}

Dokara R. ^{[2
]}

Ortiz-León G.N. ^{[2
,6
]}

Rugel M.R. ^{[2
]}

Nguyen H. ^{[2
]}

Gong Y. ^{[2
]}

Chakraborty A. ^{[7
]}

Beuther H. ^{[8
]}

Billington S.J. ^{[3
]}

Carrasco-Gonzalez C. ^{[9
]}

Csengeri T. ^{[10
]}

Hofner P. ^{[5
,11
]}

Ott J. ^{[4
]}

Pandian J.D. ^{[12
]}

Roy N. ^{[13
]}

Yanza V. ^{[9
]}

机构：

[1] Iram, 300 rue de la piscine, Saint-Martin-d' Hères

[2] Max-Planck-Institut für Radioastronomie (MPIfR), Auf dem Hügel 69, Bonn

[3] Centre for Astrophysics and Planetary Science, University of Kent, Canterbury

[4] German Aerospace Center, Scientific Information, Cologne

[5] National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, 22903, VA

[6] Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM), Apdo Postal 70-264, México, D.F.

[7] McGill University, 3600 rue University, Montreal, H3A 2T8, QC

[8] Max Planck Institute for Astronomy, Koenigstuhl 17, Heidelberg

[9] Instituto de Radioastronomía y Astrofísica (IRyA), Universidad Nacional Autónoma de México Morelia, México

[10] Laboratoire d' Astrophysique de Bordeaux, Univ. Bordeaux, Cnrs, B18N, allée Geoffroy Saint-Hilaire, Pessac

[11] Physics Department, New Mexico Tech, 801 Leroy Place, Socorro, 87801, NM

[12] Department of Earth and Space Science, Indian Institute for Space Science and Tecnology, Trivandrum

[13] Department of Physics, Indian Institute of Science, Bangalore

来源：

Astronomy and Astrophysics | 2023年 / 670卷

基金：

欧洲研究理事会; 英国科学技术设施理事会; 英国科研创新办公室; 欧盟地平线“2020”; 美国国家航空航天局;

关键词：

Catalogs; Radio continuum: general; Stars: formation; Surveys; Techniques: interferometric;

D O I：

10.1051/0004-6361/202143019

中图分类号：

学科分类号：

摘要：

As part of the Global View on Star Formation (GLOSTAR) survey we have used the Karl G. Jansky Very Large Array (VLA) in its B-configuration to observe the part of the Galactic plane between longitudes of 28 and 36 and latitudes from-1 to +1 at the C-band (4-8 GHz). To reduce the contamination of extended sources that are not well recovered by our coverage of the (u, v)-plane, we discarded short baselines that are sensitive to emission on angular scales >4′. The resulting radio continuum images have an angular resolution of 1.′0 and a sensitivity of ∼60 μJy beam-1, making it the most sensitive radio survey covering a large area of the Galactic plane with this angular resolution. An automatic source extraction algorithm was used in combination with visual inspection to identify a total of 3325 radio sources. A total of 1457 radio sources are ≥7σ and comprise our highly reliable catalog; 72 of these are grouped as 22 fragmented sources, for example, multiple components of an extended and resolved source To explore the nature of the cataloged radio sources, we searched for counterparts at millimeter and infrared wavelengths. Our classification attempts resulted in 93 H II region candidates, 104 radio stars, and 64 planetary nebulae, while it is suggested that most of the remaining radio sources are extragalactic sources. We investigated the spectral indices (α, Sv vα) of radio sources classified as H II region candidates and found that many have negative values. This may imply that these radio sources represent young stellar objects that are members of the star clusters around the high-mass stars that excite the H II regions, but not these H II regions themselves. By comparing the peak flux densities from the GLOSTAR and CORNISH surveys, we have identified 49 variable radio sources, most of them with an unknown nature. Additionally, we provide a list of 1866 radio sources detected within 5 to 7σ levels. © 2022 Astronomy and Astrophysics. All rights reserved.

引用

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