J/A+A/627/A175 GLOSTAR. Radio Source Catalogue I (Medina+ 2019)
GLOSTAR: Radio Source Catalog I. 28°<l<36° and |b|<1°.
Medina S.-N.X., Urquhart J.S., Dzib S.A., Brunthaler A., Cotton B.,
Menten K.M., Wyrowski F., Beuther H., Billington S.J., Carrasco-Gonzalez C.,
Csengeri T., Gong Y., Hofner P., Nguyen H., Ortiz-Leon G.N., Ott J.,
Pandian J.D., Roy N., Sarkar E., Wang Y., Winkel B.
<Astron. Astrophys. 627, A175 (2019)>
=2019A&A...627A.175M 2019A&A...627A.175M (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio sources ; Galactic plane
Keywords: survey - radiation mechanisms: thermal - radio continuum: general -
stars: formation - techniques: interferometric -
radiation mechanisms: non-thermal
Abstract:
Radio continuum surveys of the Galactic plane are an excellent way to
identify different source populations such as planetary nebulae, HII
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 (∼40uJy/beam) and range of angular
scales (∼1.5" to the largest radio structures in the Galaxy).
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 60-150uJy/beam.
We present data acquired in 40 hours of observations with the VLA in
D-configuration. Two 1GHz wide sub-bands were observed simultaneously
and they were centered at 4.7 and 6.9GHz. 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.
The final catalog consists of 1575 discrete radio sources and 27 large
scale structures (including W43 and W44). By crossmatching with other
catalogs and calculating the spectral indices
(S(ν)∝να), we have classified 231 continuum
sources as HII 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.
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 HII regions in this part of the Galaxy by a factor of
four.
Description:
We present a catalog (table7) of 1575 radio continuum sources in the
galactic plane at 5.8GHz. Here are listed their physical properties,
emission nature and relation with previously reported sources. The
observations were carried out with the VLA telescope in
D-configuration. The source names that are appended with a '++' to
indicate that the source has been split and a '+' that the source has
been recovered (full description in in Sects. 3.2.1-2).
Table 2: We present 27 identified sources with large scale emission
from the GLOSTAR survey by comparing the distribution of radio
emission to that of the 8 micrometers maps extracted from GLIMPSE
archive. Here are listed their maximum and minimum longitude position
and maximum and minimum latitude position (encapsulate region) and
their integrated flux. A full description is in in Sects. 3.2.3.
Table 5: We present 26 radio sources from CORNISH survey that do not
have a counterpart in GLOSTAR survey. Here are listed the CORNISH name
sources with their integrated and peak flux density, and the measured
rms towards the position of the CORNISH sources in the GLOSTAR map. A
full description is in in Sects. 4.1.1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 180 1575 GLOSTAR source catalog
table2.dat 90 27 Large scale structures
table5.dat 72 26 Catalog names and fluxes for CORNISH sources
not detected in GLOSTAR
fits/* . 1628 Individual fits images, in Figures 5, 7 and 9
of the paper
fig17/* . 1575 Individual eps images, in Figure 17 of the paper
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See also:
J/ApJS/205/1 : CORNISH project. II. Source catalog (Purcell+, 2013)
J/A+A/615/A103 : CORNISH project. III. UCHII region catalogue
(Kalcheva+, 2018)
J/MNRAS/480/2423 : CORNISH project IV. Radio-selected galactic PN
(Irabor+, 2018)
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name GLOSTAR name constructed from the peak flux
density positions (GLLL.lll+BB.bbb)
16- 17 A2 --- n_Name [+ ] Note on Name (1)
20- 25 F6.3 deg GLON Galactic longitude (2)
27- 32 F6.3 deg GLAT Galactic latitude (2)
34- 39 F6.1 --- SNR Signal to noise value (3)
41- 47 F7.2 mJy/beam Speak Peak flux density value at 5.8GHz
49- 54 F6.2 mJy/beam e_Speak Error in the peak flux density values
56- 62 F7.2 mJy Sint Integrated flux density value at 5.8GHz
64- 69 F6.2 mJy e_Sint Error in the integrated flux density values
71- 74 F4.1 --- Y-factor Ratio of the integrated and peak flux
densities
76- 81 F6.2 arcsec Radius ?=- Radius, determined from the number of
pixels associated with the source (4)
83- 87 F5.2 --- alpha ?=- Spectral index value calculated from
THOR and GLOSTAR are 1.5GHz and 5.8GHz,
respectively
89- 92 F4.2 --- e_alpha ?=- Error of the spectral index value
calculated from THOR and GLOSTAR are 1.5GHz
and 5.8GHz, respectively
94- 98 F5.2 --- alpha* ?=- Spectral index value calculated from
the 8 sub-images of GLOSTAR
100-103 F4.2 --- e_alpha* ?=- Error of the spectral index value
calculated from the 8 sub-images of GLOSTAR
105-120 A16 --- Class Classification assigned to the source
122 I1 --- Ref [1/8]? Reference from previous detection
when is available (5)
124-151 A28 --- FileName Name of the FITS image in subdirectory fits
153-180 A28 ---- Fig17 Name of the eps 3-colour image in
subdirectory fig17
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Note (1): Note as follows:
++ = source has been split
+ = source has been recovered
Note (2): It is a centroid position. It can be offset from the peak position
if the source is extended.
Note (3): Signal to noise value is estimated by dividing the peak flux by the
rms at the same position.
Note (4): It is a crude estimate, particularly for extended structures and
should be used with caution.
Note (5): References as follows:
1 = this work
2 = Kalcheva et al. (2018, Cat. J/A+A/615/A103)
3 = Anderson et al. (2014, Cat. J/ApJS/212/1)
4 = Giveon et al. (2005, Cat. J/AJ/129/348)
5 = SIMBAD
6 = Irabor et al. (2018, Cat. J/MNRAS/480/2423)
7 = Ortega et al. (2010A&A...510A..96O 2010A&A...510A..96O)
8 = Purcell et al. (2013, Cat. J/ApJS/205/1)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Source name
19- 24 A6 --- n_Name Note on Name (1)
26- 31 F6.3 deg lmin Minimum longitude position of the source
33- 38 F6.3 deg lmax Maximum longitude position of the source
40- 45 F6.3 deg bmin Minimum latitude position of the source
47- 52 F6.3 deg bmax Maximum latitude position of the source
54- 58 F5.2 Jy IntFlux Integrated flux at 5.8GHz
60- 90 A31 --- FileName Name of the fits images in subdirectory fits
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Note (1): The sources with * are associated with a SNR from the catalog of
Green (2014ApJ...783..114G 2014ApJ...783..114G).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- CORNISH CORNISH source name
19- 22 F4.2 mJy/beam Speak Peak flux at 5GHz from CORNISH
24- 27 F4.2 mJy Sint Integrated flux at 5GHz from CORNISH
29- 33 F5.3 mJy/beam rms Measured rms towards the position of the
CORNISH sources in the GLOSTAR map
35- 72 A38 --- FileName Name of the fits images in subdirectory fits
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Acknowledgements:
Sac Nicte Medina, smedina(at)mpifr-bonn.mpg.de
(End) Sac Nicte Medina [MPIfR, Germany], Patricia Vannier [CDS] 20-Jun-2019