University of Oulu

Medina, S.-N. X., Urquhart, J. S., Dzib, S. A., Brunthaler, A., Cotton, B., Menten, K. M., … Winkel, B. (2019). GLOSTAR: Radio Source Catalog I. 28° <  ℓ < 36° and |b| < 1°. Astronomy & Astrophysics, 627, A175.

GLOSTAR: Radio Source Catalog I. 28° <  ℓ < 36° and |b| < 1°⋆

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Author: Medina, S.-N. X.1; Urquhart, J. S.2; Dzib, S. A.1;
Organizations: 1Max-Planck-Institut für Radioastronomie (MPIfR), Auf dem Hügel 69, 53121 Bonn, Germany
2School of Physical Sciences, University of Kent, Ingram Building, Canterbury, Kent CT2 7NH, UK
3National Radio Astronomy Observatory (NRAO), 520 Edgemont Road, Charlottesville, VA 22903, USA
4Max Planck Institute for Astronomy, Koenigstuhl 17, 69117 Heidelberg, Germany
5Instituto de Radioastronomía y Astrofísica (IRyA), Universidad Nacional Autónoma de México Morelia, 58089, Mexico
6Physics Department, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, USA
7National Radio Astronomy Observatory, 1003 Lopezville Road, PO Box O, Socorro, NM 87801, USA
8Department of Earth and Space Science, Indian Institute for Space Science and Tegnology, Trivandrum 695547, India
9Department of Physics, Indian Institute of Science, Bangalore 560012, India
10Sodankylä Geophysical Observatory, University of Oulu, 99600 Sodankylä, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.4 MB)
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Language: English
Published: EDP Sciences, 2019
Publish Date: 2019-08-14


Context: Radio continuum surveys of the Galactic plane are an excellent way to identify different source populations such as planetary nebulae, H Ⅱ regions, and radio stars and characterize their statistical properties. The Global View of Star Formation in the Milky Way (GLOSTAR) survey will study the star formation in the Galactic plane between −2° < ℓ < 85° and |b| < 1° with unprecedented sensitivity in both flux density (∼40 μJy beam⁻¹) and range ofangular scales (∼1″.5 to the largest radio structures in the Galaxy).

Aims: In this paper we present the first results obtained from a radio continuum map of a 16-square-degree-sized region of the Galactic plane centered on ℓ = 32° and b = 0° (28° < ℓ < 36° and |b| <1°). This map has a resolution of 18″ and a sensitivity of ∼60−150 μJy beam⁻¹.

Methods: We present data acquired in 40 h of observations with the VLA in D-configuration. Two 1 GHz wide sub-bands were observed simultaneously and they were centered at 4.7 and 6.9 GHz. These data were calibrated and imaged using the Obit software package. The source extraction was performed using the BLOBCAT software package and verified through a combination of visual inspection and cross-matching with other radio and mid-infrared surveys.

Results: The final catalog consists of 1575 discrete radio sources and 27 large scale structures (including W43 and W44). By cross-matching with other catalogs and calculating the spectral indices (S(ν) ∝ να), we have classified 231 continuum sources as H Ⅱ regions, 37 as ionization fronts, and 46 as planetary nebulae. The longitude and latitude distribution and negative spectral indices are all consistent with the vast majority of the unclassified sources being extragalactic background sources.

Conclusions: We present a catalog of 1575 radio continuum sources and discuss their physical properties, emission nature, and relation to previously reported data. These first GLOSTAR results have increased the number of reliable H Ⅱ regions in this part of the Galaxy by a factor of four.

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Series: Astronomy and astrophysics
ISSN: 0004-6361
ISSN-E: 1432-0746
ISSN-L: 0004-6361
Volume: 627
Article number: A175
DOI: 10.1051/0004-6361/201935249
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: N.R. acknowledges support from the Infosys Foundation through the Infosys Young Investigator grant. H.B. acknowledges support from the European Research Council under the Horizon 2020 Framework Program via the ERC Consolidator Grant CSF-648505. This research was partially funded by the ERC Advanced Investigator Grant GLOSTAR (247078). It made use of information from the ATLASGAL database at by the MPIfR, Bonn, as well as information from the CORNISH database at, which was constructed with support from the Science and Technology Facilities Council of the UK. This publication also makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.
Copyright information: © S.-N. X. Medina et al. 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.