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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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) d = data reported by Downes et al. (1980A&AS...40..379D) e = data reported by Wilson (1972A&A....19..354W) f = data reported by Whiteoak & Gardner (1974A&A....37..389W)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Source Source name 15- 16 A2 --- --- [MC] 17 I1 --- MC [1/4]? H_2_CO 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
Note (1): G15.181-0.63 corrected into G15.181-0.62, as in table1.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Source Source name 15- 16 A2 --- --- [MC] 17 I1 --- MC [1/4]? H_2_CO 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)
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) have reported this source' s kinematic distance.
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.
Acknowledgements: Zhimao Du, zhimaodu(at)gmali.com References: Araya et al., 2002ApJS..138...63A Watson et al., 2003ApJ...587..714W Sewilo et al., 2004APJS...154..553S Han et al., 2011RA&A...11..156H
(End) Zhimao Du [XAO], Patricia Vannier [CDS] 01-Aug-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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