J/A+A/623/A105 Radio catalogue of Galactic HII regions (Gao+, 2019)
A Sino-German λ6cm polarisation survey of the Galactic plane.
IX. HII regions.
Gao X.Y., Reich P., Hou L.G., Reich W., Han J.L.
<Astron. Astrophys. 623, A105 (2019)>
=2019A&A...623A.105G 2019A&A...623A.105G (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Radio sources
Keywords: H II regions - radio continuum: general - methods: observational
Abstract:
Large-scale radio continuum surveys provide data to get insights into
the physical properties of radio sources. HII regions are prominent
radio sources produced by thermal emission of ionised gas around young
massive stars.
We identify and analyse HII regions in the Sino-German λ6cm
polarisation survey of the Galactic plane.
Objects with flat radio continuum spectra together with infrared
and/or Hα emission were identified to be HII regions. For HII
regions with small apparent sizes, we cross-matched the λ6cm
small-diameter source catalogue with the radio HII region catalogue
compiled by Paladini and the infrared HII region catalogue based on
the WISE data. Effelsberg λ21cm and λ11cm continuum
survey data were used to determine source spectra. High angular
resolution data from the Canadian Galactic Plane Survey and the NVSS
were used to solve the confusion when low angular resolution
observations are not sufficient. Extended HII regions were identified
by overlaying the Paladini and the WISE HII regions onto the
λ6cm survey images for coincidences by eye. The TT-plot method
was employed for spectral index verification.
401 HII regions were identified and their flux densities were
determined with the Sino-German λ6cm survey data. In the
surveyed area, 76 pairs of sources are found to be duplicated in the
Paladini HII region catalogue mainly due to the non-distinction of
previous observations with different angular resolutions, and 78
objects in their catalogue are misclassified as HII regions, being
actually planetary nebulae, supernova remnants or extragalactic
sources that have steep spectra. More than 30 HII regions and HII
region candidates from our λ6cm survey data, especially
extended ones, do not have counterparts in the WISE HII region
catalogue, among which 9 are identified for the first time. Our
results imply that some more Galactic HII regions still await to be
discovered and the combination of multi-domain observations is
important for HII region identification. Based on the newly derived
radio continuum spectra and the evidence of infrared emission, the
previously identified SNRs G11.1-1.0, G20.4+0.1 and G16.4-0.5 are
believed to be HII regions.
Description:
The catalogue collects 401 HII regions identified from the Sino-German
λ6cm polarisation survey of the Galactic plane. The
small-diameter HII regions are from the cross-matches between the 6cm
small-diameter source catalogue and the Paladini HII region catalogue
and the HII region catalogue based on the WISE data. The extended HII
regions are picked out by overlaying the Paladini and WISE HII regions
onto the 6cm images and searching for coincidence by eye. The spectra
of the HII regions selected by the above procedure are further
inspected either through spectral fits using the Effelsberg 21cm, 11cm
and the Urumqi 6cm flux densities or by the TT-plot method. For this
HII region catalogue from the 6cm survey, we quote the flux densities
at various frequencies that were previously reported in literature
together with the new 6cm measurement. We also incorporate the
distance information of the HII regions if available.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 216 989 Small-diameter HII regions identified in the
Urumqi λ6cm survey by comparing with the
Paladini HII region catalogue
table3.dat 174 112 Small-diameter HII regions that have WISE HII
region counterparts but not in Paladini catalogue
table4.dat 200 107 Extended HII regions in the Urumqi λ6cm
survey
table5.dat 206 126 78 misclassifications found in the Paladini HII
region catalogue with the Urumqi λ6cm data
refs.dat 67 44 References
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See also:
J/A+A/397/213 : Galactic HII regions (Paladini+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- No [129/932] HII region number in Paladini HII
region catalogue, Cat. J/A+A/397/213
5- 15 A11 --- Name Name based on Galactic coordinates
17- 23 F7.3 deg GLON Galactic Longitude
25- 30 F6.3 deg GLAT Galactic Latitude
32- 34 A3 --- r_GLON Reference for coordinates, in refs.dat file
36- 40 F5.2 kpc Dist ? Distance
42- 45 F4.2 kpc e_Dist ? rms uncertainty on Dist
47- 52 A6 --- r_Dist Reference for distance, in refs.dat file
54- 60 F7.3 Jy S1.4GHz ? Effelsberg 1.4GHz flux density
62- 68 F7.3 Jy S2.7GHz ? Effelsberg 2.7GHz flux density
70- 76 F7.3 Jy S4.8GHz ? Urumqi 4.8GHz flux density
78 A1 --- l_S Upper limit flag for S
79- 85 F7.3 Jy S ? Multi-frequency flux densities in literature
87- 90 F4.1 GHz Freq Observing frequency for S
92- 96 A5 --- r_S References for multi-frequency flux
densities in literature, in refs.dat file
99-216 A118 --- Rem Notes for the source
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/74] HII region number
6- 15 A10 --- Name Name based on Galactic coordinates
17- 23 F7.3 deg GLON Galactic Longitude of the Urumqi 6cm source
25- 30 F6.3 deg GLAT Galactic Latitude of the Urumqi 6cm source
32 A1 --- l_Thetamaj Upper limit flag on Thetamaj
33- 36 F4.1 arcmin Thetamaj Major axis of the intrinsic size
38 A1 --- l_Thetamin Upper limit flag on Thetamin
39- 42 F4.1 arcmin Thetamin Minor axis of the intrinsic size
44- 48 F5.3 Jy S4.8GHz Urumqi 4.8GHz flux density
50- 56 F7.3 deg GLONW Galactic longitude of the WISE source
59- 64 F6.3 deg GLATW Galactic latitude of the WISE source
66- 69 F4.1 arcmin Theta Size of the WISE source
71 A1 --- Type [KCQG] WISE type
72 A1 --- Note [*] Note on WISE type (1)
74- 78 F5.2 kpc Dist ? Distance for the HII region
80- 83 F4.2 kpc e_Dist ? rms uncertainty on Dist
85- 90 A6 --- r_Dist Reference for distance, in refs.dat file
93-174 A82 --- Rem Notes for the source
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Note (1): K* indicates currently known HII regions (original C-type
WISE HII regions) according to Kim et al. (2018ApJS..238...28K 2018ApJS..238...28K)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/107] HII region number (1)
5- 14 A10 --- Name Name based on Galactic coordinates
16- 21 F6.2 deg GLON Galactic Longitude of the Urumqi 6cm source
23- 27 F5.2 deg GLAT Galactic Latitude of the Urumqi 6cm source
29- 33 F5.1 arcmin Thetamaj Major axis of the apparent size
35- 39 F5.1 arcmin Thetamin Minor axis of the apparent size
41- 47 F7.3 Jy S4.8GHz Urumqi 4.8GHz flux density
49- 55 F7.3 deg GLONW ? Galactic longitude of the WISE source
57- 62 F6.3 deg GLATW ? Galactic latitude of the WISE source
64- 68 F5.1 arcmin Theta ? Size of the WISE source
70- 73 F4.2 kpc Dist ? Distance for the HII region
75- 79 F5.3 kpc e_Dist ? rms uncertainty on Dist
81- 86 A6 --- r_Dist Reference for distance, in refs.dat file
88-200 A113 --- Rem Notes for the source
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Note (1): No.1 - No.74 are the extended HII regions that have counterparts
in the WISE HII region catalogue, while No.75 - No.107 do not.
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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- 3 I3 --- No [130/900] HII region number in Paladini HII
region catalogue, Cat. J/A+A/397/213
5- 14 A10 --- Name Name based on Galactic coordinates
16- 22 F7.3 deg GLON Galactic longitude
24- 29 F6.3 deg GLAT Galactic latitude
31- 33 A3 --- Ref Reference for coordinates
35- 39 F5.3 Jy S1.4GHz ? Effelsberg 1.4GHz flux density
(except No. 848)
41- 44 F4.2 Jy S2.7GHz ? Effelsberg 2.7GHz flux density
46- 50 F5.3 Jy S4.8GHz ? Urumqi 4.8GHz Flux density
52- 58 F7.3 Jy S Multi-frequency flux densities in literature
60- 63 F4.1 GHz Freq Observing frequency
65- 67 A3 --- r_S Reference for multi-frequency flux densities
in literature, in refs.dat file
69-206 A138 --- Rem Notes for the sources not being HII regions
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ref Reference code
8- 26 A19 --- BibCode BibCode
28- 45 A18 --- Atu Author's name
48- 67 A20 --- Com Comments
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Acknowledgements:
Xuyang Gao, xygao(at)nao.cas.cn
References:
Sun et al., Paper I 2007A&A...463..993S 2007A&A...463..993S
Gao et al., Paper II 2010A&A...515A..64G 2010A&A...515A..64G
Sun et al., Paper III 2011A&A...527A..74S 2011A&A...527A..74S
Xiao et al., Paper IV 2011A&A...529A..15X 2011A&A...529A..15X
Gao et al., Paper V 2011A&A...529A.159G 2011A&A...529A.159G
Gao et al., Paper VI 2011A&A...532A.144G 2011A&A...532A.144G
Gao et al., Paper VII 2011A&A...536A..83S 2011A&A...536A..83S
Reich et al., Paper VIII 2014A&A...561A..55R 2014A&A...561A..55R
(End) Patricia Vannier [CDS] 14-Jan-2019