J/A+A/532/A127 Inner Galaxy HII regions (Du+, 2011)
A H2CO and H110α survey of HII regions with the 25-m radio telescope of
Nanshan Station.
Du Z.M., Zhou J.J., Esimbek J., Han X.H., Zhang C.P.
<Astron. Astrophys. 532, A127 (2011)>
=2011A&A...532A.127D 2011A&A...532A.127D
ADC_Keywords: H II regions ; Interstellar medium ; Radio lines
Keywords: Galaxy: structure - HII regions - ISM: molecules - radio lines: ISM
Abstract:
We report simultaneous H110α and H2CO line observations with
the 25m radio telescope of Nanshan station toward 251 HII regions. We
used the H110α line to establish the velocity of the HII regions
and H2CO absorption lines to distinguish between near and far
distances. We detected the H110α RRLs in 28 sources and H2CO
absorption lines in 59 sources. In the latter case, 43 features had
not previously been observed. H2CO and H110α lines were
simultaneously detected toward 23 HII regions. We resolved the
kinematic distance ambiguities for 14 HII regions and 20 intervening
molecular clouds.
Description:
The observations were made on September 2009 to August 2010 with the
25m radio telescope of Nanshan station. One hundred and twenty sources
were selected from the IRAS Point Source Catalog. Sixty-one sources
were selected from Quireza et al. (2006, Cat. J/ApJS/165/338) and 70
sources were selected from Lockman (1989, Cat. VIII/58).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 64 Observed sources
table2.dat 66 28 H110α line parameters of sources
table3.dat 74 83 H2CO line parameters
table4.dat 83 45 Kinematic parameters
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
VIII/58 : Survey of Radio HII Regions in Northern Sky (Lockman+ 1989)
J/ApJS/165/338 : Radio recombination lines in HII regions (Quireza+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Source Source name
16- 23 A8 --- Name Alias name
25- 26 I2 h RAh Right ascension (J2000)
28- 29 I2 min RAm Right ascension (J2000)
31- 35 F5.2 s RAs Right ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 47 F4.1 arcsec DEs Declination (J2000)
49- 53 F5.3 --- rms The rms of the spectral lines (1)
55- 59 F5.2 kJy S100um ? Flux density at 100µm
61- 66 F6.2 Jy S6cm ? Flux density at 6cm (2)
68- 70 A3 --- Note Reference (3)
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Note (1): The rms of the spectral lines were obtained during our observation.
Note (2): The measurement results of the continuum flux densities at 6cm.
Note (3): References as follows:
c = data reported by Araya et al. (2004ApJS..154..579A 2004ApJS..154..579A)
d = data reported by Downes et al. (1980A&AS...40..379D 1980A&AS...40..379D)
e = data reported by Wilson (1972A&A....19..354W 1972A&A....19..354W)
f = data reported by Whiteoak & Gardner (1974A&A....37..389W 1974A&A....37..389W)
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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- 14 A14 --- Source Source name
15 A1 --- f_Source [*] Changes (1)
16- 22 F7.3 km/s VLSR ? Local Standard of Rest Velocity
24- 28 F5.3 km/s e_VLSR ? The 1σ error in VLSR
30- 34 F5.2 km/s FWHM ? Full-Width at Half-Maximum
36- 40 F5.3 km/s e_FWHM ? The 1σ error in FWHM
42- 46 F5.3 Jy SH110a ? The H110α flux density at 4874.1570MHz
48- 52 F5.3 Jy e_SH110a ? The 1σ error in SH110a
54- 60 F7.3 Jy.km/s Sint ? Integrated flux density at 4874.1570MHz
62- 66 F5.3 Jy.km/s e_Sint ? The 1σ error in Sint
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Note (1):
* G15.032-0.687 corrected into G15.032-0.68, as in table1.
* G15.181-0.63 corrected into G15.181-0.62, as in table1.
* G81.253+1.123 corrected into G81.253+1.12, as in table1.
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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- 14 A14 --- Source Source name
15- 16 A2 --- --- [MC]
17 I1 --- MC [1/4]? H2CO molecular cloud number
within the source (G1)
18 A1 --- f_Source [*] Changes (1)
19- 26 F8.3 km/s VLSR ? Local Standard of Rest Velocity
28- 32 F5.3 km/s e_VLSR ? The 1σ error in VLSR
34- 39 F6.3 km/s FWHM ? Full-Width at Half-Maximum
41- 45 F5.3 km/s e_FWHM ? The 1σ error in FWHM
47- 53 F7.3 Jy SH2CO ? The H2CO flux density at 4829.6594MHz
55- 59 F5.3 Jy e_SH2CO ? The 1σ error in SH2CO
61- 68 F8.3 Jy.km/s Sint ? Integrated flux density at 4829.6594MHz
70- 74 F5.3 Jy.km/s e_Sint ? The 1σ error in Sint
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Note (1): G15.181-0.63 corrected into G15.181-0.62, as in table1.
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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- 14 A14 --- Source Source name
15- 16 A2 --- --- [MC]
17 I1 --- MC [1/4]? H2CO molecular cloud number
within the source (G1)
18 A1 --- f_Source Changes (1)
19- 23 F5.1 km/s VLSR Local Standard of Rest Velocity
25- 29 F5.1 km/s VTP ? Tangent point velocity
31- 34 F4.2 kpc DTP ? Tangent point distance
36- 40 F5.2 kpc Dfar ? Far source distance
42- 45 F4.2 kpc Dnear ? Near source distance
47- 51 F5.2 kpc DLSR ? Adopted kinematic source distance
54- 57 F4.2 kpc E_DLSR ? Upper limit in DLSR
60- 63 F4.2 kpc e_DLSR ? Lower limit in DLSR
65- 70 F6.1 pc Z ? Galactic plane distance
72- 76 F5.2 kpc RGC ? Galactic center distance
78- 83 A6 --- Code The Near/Far code (2)
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Note (1):
* G15.181-0.63 corrected into G15.181-0.62, as in table1.
* IRAS18507+0101 was a misprint for IRAS18507+0110, corrected name
in the CDS table.
Note (2): The Near/Far code is defined as follows:
N = a source at the near kinematic distance
F = a source at the far distance
S = a molecular cloud associated with an HII region
NS = a molecular cloud associated with an UC HII region
FS = a molecular cloud associated with an UC HII region
b = No classification or distance is given for this source
c = this source is located at the tangent point
d = the distance ambiguity cannot be resolved
e = this source is located in the outer Galaxy
f = Downes et al. (1980A&AS...40..379D 1980A&AS...40..379D) have reported this source' s
kinematic distance.
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Global notes:
Note (G1): Indicates the direction of the H2CO molecular cloud, but we
do not imply an association between the H2CO molecular cloud and
the background HII region.
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Acknowledgements:
Zhimao Du, zhimaodu(at)gmali.com
References:
Araya et al., 2002ApJS..138...63A 2002ApJS..138...63A
Watson et al., 2003ApJ...587..714W 2003ApJ...587..714W
Sewilo et al., 2004APJS...154..553S
Han et al., 2011RA&A...11..156H 2011RA&A...11..156H
(End) Zhimao Du [XAO], Patricia Vannier [CDS] 01-Aug-2011