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J/ApJ/517/282     Atomic carbon observations of  H II regions (Huang+, 1999)

Atomic carbon observations of southern hemisphere H II region Huang M., Bania T.M., Bolatto A., Chamberlin R.A., Ingalls J.G., Jackson J.M., Lane A.P., Stark A.A., Wilson R.W., Wright G.A. <Astrophys. J. 517, 282 (1999)> =1999ApJ...517..282H
ADC_Keywords: H II regions ; Radio lines Keywords: H II regions - ISM: atoms - ISM: molecules Abstract: We report observations of atomic carbon (C I [3P - 3P0]) for a sample of 49 southern hemisphere H II regions using the Antarctic Submillimeter Telescope and Remote Observatory. The sources are compact and isolated members of the Wilson et al. (1970) H109α radio recombination line (RRL) catalog. The fourth Galactic quadrant is well covered by the sample. Atomic carbon emission is detected toward all of the regions, with multiple C I emission components found toward most sources. The RRL velocity is used to identify the C I emission associated with the H II region. We measure the mean velocity difference between the C I and RRL emission to be 0.8±2.8 km s-1. Within the measurement errors this is exact agreement in velocity; we conclude that all H II regions have associated C I emission. The mean C I line temperature of these components is 2.4±1.8 K, compared with 0.7±0.7 K for the C I emission components not associated with the H II region. This suggests that C I intensity is dominated by local heating. The FWHM line width of C I gas associated with H II regions also is marginally greater than that found for unassociated gas (6.7±3.0, compared with 4.8±2.4 km s-1). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 102 113 C I emission properties of the HII regions
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Object name 19- 20 I2 h RAh Right Ascension (B1950) 22- 23 I2 min RAm Right Ascension (B1950) 25- 28 F4.1 s RAs Right Ascension (B1950) 30 A1 --- DE- Declination (B1950) 31- 32 I2 deg DEd Declination (B1950) 34- 35 I2 arcmin DEm Declination (B1950) 37- 38 I2 arcsec DEs Declination (B1950) 40- 45 F6.1 km/s VLSR Local Standard of Rest velocity 48- 50 F3.1 km/s e_VLSR Uncertainty in V-LSR 53- 55 F3.1 K Temp Peak temperature 59- 61 F3.1 K e_Temp Uncertainty in Temp 63- 66 F4.1 km/s FWHM Full Width Half Maximum of the emission line 70- 72 F3.1 km/s e_FWHM Uncertainty in FWHM 74- 77 F4.1 K.km/s Area Line area 81- 83 F3.1 K.km/s e_Area Uncertainty in Area 85- 88 F4.2 K GRMS Residual rms after Gaussian fit subtraction 90- 93 F4.2 K BRMS 1σ rms noise level in the baseline 95- 96 A2 --- n_Name Bn: nth order polynomial baseline removed 98- 99 A2 --- f_Name [orfn] (1)
Note (1): o = blended lines make Gaussian fits nonunique r = emission at reference position contaminating at least one emission-line component f = spectrum also contains emission feature too complex to fit n = polynomial baseline removed
History: From ApJ electronic edition References: Wilson, T. L., Mezger, P. G., Gardner, F. F., & Milne, D. K. 1970, A&A, 6, 364 (1970A&A.....6..364W)
(End) Greg Schwarz [AAS] 07-Mar-2000
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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