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J/A+A/612/A36       G346.056-0.021 and G346.077-0.056 radio images  (Das+, 2018)

Radio and infrared study of southern H II regions G346.056-0.021 and G346.077-0.056. Das S.R., Tej A., Vig S., Liu T., Ghosh S.K., Chandra C.H.I. <Astron. Astrophys. 612, A36 (2018)> =2018A&A...612A..36D (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Radio sources ; Radio continuum Keywords: infrared: ISM - radio continuum: ISM - ISM: H II regions - ISM: individual objects: G346.056-0.021 - ISM: individual objects: G346.077-0.056 Abstract: We present a multiwavelength study of two southern Galactic H II regions G346.056-0.021 and G346.077-0.056 which are located at a distance of 10.9kpc. The distribution of ionized gas, cold and warm dust, and the stellar population associated with the two H II regions are studied in detail using measurements at near-infrared, mid-infrared, far-infrared, submillimeter and radio wavelengths. The radio continuum maps at 1280 and 610MHz were obtained using the Giant Metrewave Radio Telescope to probe the ionized gas. The dust temperature, column density, and dust emissivity maps were generated using modified blackbody fits in the far-infrared wavelength range 160-500um. Various near- and mid-infrared color and magnitude criteria were adopted to identify candidate ionizing star(s) and the population of young stellar objects in the associated field. The radio maps reveal the presence of diffuse ionized emission displaying distinct cometary morphologies. The 1280MHz flux densities translate to ZAMS spectral types in the range O7.5V-O7V and O8.5V-O8V for the ionizing stars of G346.056-0.021 and G346.077-0.056, respectively. A few promising candidate ionizing star(s) are identified using near-infrared photometric data. The column density map shows the presence of a large, dense dust clump enveloping G346.077-0.056. The dust temperature map shows peaks towards the two HII regions. The submillimeter image shows the presence of two additional clumps, one being associated with G346.056-0.021. The masses of the clumps are estimated to range between ∼1400 and 15250M. Based on simple analytic calculations and the correlation seen between the ionized gas distribution and the local density structure, the observed cometary morphology in the radio maps is better explained invoking the champagne-flow model. Description: To probe the ionized emission associated with the HII regions, radio continuum mapping was carried out at 610 and 1280MHz using the Giant Metrewave Radio Telescope (GMRT), Pune India. The continuum observations were carried out at 610 and 1280MHz with a bandwidth of 32MHz. For any clarification kindly contact : swagat.12(at)iist.ac.in / dasswagat77(at)gmail.com Objects: ---------------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------------- 17 07 54.1 -40 31 36 G346.077-0.056 = HRDS G346.077-0.056 17 07 40.5 -40 31 38 G346.056-0.021 = HRDS G346.056-0.021 ---------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 169 4 List of fits images fits/* 0 4 Individual fits images
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 23 I4 --- Nx Number of pixels along X-axis 25- 28 I4 --- Ny Number of pixels along Y-axis 30- 39 A10 "date" Obs.date Observation date 41- 47 F7.2 MHz Freq Observed frequency 49- 53 I5 Kibyte size Size of FITS file 55- 75 A21 --- FileName Name of FITS file, in subdirectory fits 77-169 A93 --- Title Title of the FITS file
Acknowledgements: Swagat Ranjan Das, swagat.12(at)iist.ac.in
(End) Patricia Vannier [CDS] 19-Feb-2018
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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