J/A+A/670/A9 GLOSTAR. Radio Source Catalogue. II. (Dzib+, 2023)
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.
Dzib S.A., Yang A.Y., Urquhart J.S., Medina S.-N.X., Brunthaler A.,
Menten K.M., Wyrowski F., Cotton W.D., Dokara R., Ortiz-Leon G.N.,
Ruegel M., Nguyen H., Gong Y., Chakraborty A., Beuther H., Billington S.,
Carrasco-Gonzalez, Csengeri T., Hofner P., Ott J., Pandian J.D., Roy N.,
Yanza V.
<Astron. Astrophys. 670, A9 (2023)>
=2023A&A...670A...9D 2023A&A...670A...9D (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio sources ; Galactic plane ; Interferometry
Keywords: catalogs - surveys - radio continuum: general - stars: formation -
techniques: interferometric
Abstract:
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 28d
and 36d and latitudes from -1° to +1° at the C-band (4-8GHz).
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 ∼60uJy/beam, 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 HII 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 (alpha, Snu ∝
nualpha) of radio sources classified as HII 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 HII 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.
Description:
As part of the GLOSTAR survey, the VLA in its B- and Dconfiguration
was used to observe a large portion of the Galactic plane in the
C-band. In this paper we present the B-array observations covering the
area within 28°≤l≤36° and |b|<1°, which we previously
investigated using data obtained in the D-configuration (Medina et
al., 2019A&A...627A.175M 2019A&A...627A.175M, Cat. J/A+A/627/A175). Using a combination of
automatic source extraction with BLOBCAT (Hales et al.,
2012MNRAS.425..979H 2012MNRAS.425..979H) and visual inspection we have identified 3325
radio sources.
The catalog of these radio sources is divided in two parts.
The catalog of highly reliable radio sources contains 1457 entries.
Detailed properties of these sources are given, such as the positions,
the signal-to-noise-ratio, integrated and peak fluxes, the ratio
between these two values (also known as the Y-factor), the effective
radii, and the spectral indices.
The weak source catalog lists 1866 sources with a signal-to-noise
ratio between 5 to 7. Only their basic properties such as positions,
the signal-to-noise ratio, integrated and peak fluxes are given.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 148 1457 GLOSTAR B-configuration catalog for
28°<l<36° and |b|<1°
tablea1.dat 83 1866 Catalog of sources with signal-to-noise ratio
in the range between 5 to 7σ
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See also:
J/A+A/627/A175 : GLOSTAR. Radio Source Catalogue. I. (Medina+ 2019)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name GLOSTAR B configuration name
(GLLL.llll+BB.bbbb)
19- 26 F8.5 deg GLON [28.0/36.0] Galactic longitude
28- 35 F8.5 deg GLAT [-1.04/1.04] Galactic latitude
37- 42 F6.1 --- S/N [7.0/1933.0] Signal to noise ratio
44- 49 F6.2 mJy/beam Speak [0.4/744.22] Peak flux density at 5.8GHz
51- 55 F5.2 mJy/beam e_Speak [0.06/41.18] Peak flux density error
at 5.8GHz
57- 62 F6.2 mJy Sint [0.35/908.09] Integrated flux density
at 5.8GHz
64- 68 F5.2 mJy e_Sint [0.06/45.41] Integrated flux density error
at 5.8GHz
70- 73 F4.2 --- Y [0.68/8.98] Y factor = Sint/Speak
75- 77 F3.1 arcsec Reff [0.6/3.8] Effective radius
79- 83 F5.2 --- alpha [-3.7/2.96]? Spectral index
85- 89 F5.2 --- e_alpha [0.02/2.48]? Spectral index error
91-111 A21 --- GLOSTARD GLOSTAR D-configuration name
(GLLL.llll+BB.bbbb)
113-115 A3 --- NIR [Yes ] Counterpart at near infrared
117-119 A3 --- MIR [Yes ] Counterpart at mid infrared
121-123 A3 --- FIR [Yes ] Counterpart at far infrared
125-127 A3 --- submm [Yes ] Counterpart at submillimeter
wavelengths
129-148 A20 --- Class Source classification (1)
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Note (1): Source classification as follows:
EgC = Extragalctic radio source candidate
HII = HII region candidate Radio star
PN = planetary nebula
WR = Wolf-Rayet star
PDR = Photodissociation region
Radio star = Radio star
Pulsar = Pulsar
Unknown = source with no clear classification
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- Name GLOSTAR B configuration name
(GLLL.llll+BB.bbbb)
20- 27 F8.5 deg GLON [28.0/36.0] Galactic longitude
29- 36 F8.5 deg GLAT [-1.04/1.04] Galactic latitude
38- 40 F3.1 --- S/N [5.0/6.9] Signal to noise ratio
42- 45 F4.2 mJy/beam Speak [0.28/4.67] Peak flux density at 5.8GHz
47- 50 F4.2 mJy/beam e_Speak [0.06/0.8] Peak flux density error at 5.8GHz
52- 55 F4.2 mJy Sint [0.26/9.99] Integrated flux density
at 5.8GHz
57- 60 F4.2 mJy e_Sint [0.06/0.87] Integrated flux density error
at 5.8GHz
62- 64 A3 --- Class Classification from SIMBAD database
66- 83 A18 --- GLOSTARD GLOSTAR D-configuration name
(GLLL.llll+BB.bbbb)
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Acknowledgements:
Sergio A. Dzib, dzib(at)iram.fr
References:
Medina et al., Paper I 2019A&A...627A.175M 2019A&A...627A.175M, Cat. J/A+A/627/A175
GLOSTAR: Radio Source Catalog. I. 28° < l < 36° and |b| < 1°.
Brunthaler et al., Paper I 2021A&A...651A..85B 2021A&A...651A..85B,
A global view on star formation: The GLOSTAR Galactic plane survey. I.
Overview and first results for the Galactic longitude range
28°<l<36°.
Dokara et al., Paper II 2021A&A...651A..86D 2021A&A...651A..86D,
A global view on star formation: The GLOSTAR Galactic plane survey. II.
Supernova remnants in the first quadrant of the Milky Way.
Ortiz-Leon et al., Paper III 2021A&A...651A..87O 2021A&A...651A..87O,
A global view on star formation: the GLOSTAR Galactic plane survey. III.
6.7 GHz methanol maser survey in Cygnus X.
Nguyen et al., Paper IV 2021A&A...651A..88N 2021A&A...651A..88N,
A global view on star formation: The GLOSTAR Galactic plane survey. IV.
Radio continuum detections of young stellar objects in the
Galactic Centre region.
Nguyen et al., Paper V 2022A&A...666A..59N 2022A&A...666A..59N,
A global view on star formation: The GLOSTAR Galactic plane survey V.
6.7 GHz methanol maser catalogue.
(End) Patricia Vannier [CDS] 28-Nov-2022