J/A+A/652/A77 Large scale [CII] emission from the OMC (Higgins+, 2021)
Observation and calibration strategies for large-scale multi-beam
velocity-resolved mapping of the [CII] emission in the Orion molecular cloud.
Higgins R., Kabanovic S., Pabst C., Teyssier D., Goicoechea J.R., Berne O.,
Chambers E., Wolfire M., Suri S.T., Buchbender C., Okada Y., Mertens M.,
Parikka A., Aladro R., Richter H., Guesten R., Stutzki J., Tielens A.G.G.M.
<Astron. Astrophys. 652, A77 (2021)>
=2021A&A...652A..77H 2021A&A...652A..77H (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Radio lines ; Interstellar medium
Keywords: instrumentation: spectrographs - methods: observational -
ISM: kinematics and dynamics - submillimeter: ISM -
photon-dominated region - local interstellar matter
Abstract:
The [CII] 158um far-infrared (FIR) fine-structure line is one of the
dominant cooling lines of the star-forming interstellar medium (ISM).
Hence [CII] emission originates in, and thus can be used to trace a
range of ISM processes. Velocity resolved large scale mapping of [CII]
in star forming regions provides a unique perspective on the
kinematics of these regions and their interactions with the exciting
source of radiation. In this paper we explore the scientific
applications of large scale mapping velocity resolved [CII]
observations. With [CII] observations we investigate the influence of
stellar feedback on the ISM. We present the details of observation,
calibration and data reduction using a heterodyne array receiver
mounted on an airborne observatory. A 1.15 square degree velocity
resolved map of Orion molecular cloud centred on the bar region was
observed using the upGREAT heterodyne receiver flying on-board the
Stratospheric Observatory for Infrared Astronomy (SOFIA). The data was
acquired using the 14 pixels of the German REceiver for Astronomy at
Terahertz Frequencies (upGREAT) observing in an on-the-fly mapping
mode. 2.4 million spectra were taken in total. These spectra were
gridded into a three dimensional cube with a spatial resolution of
14.1 arcseconds and spectral resolution of 0.3km/s.
Description:
Cube was generated using GILDAS using the xy_map function.
Velocity sample to a grid of 0.3km/s.
18 arcsecond beam, 3.5 arcsecond pixels
Details of cube generation are contained in the reduction script.
Objects:
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RA (2000) DE Designation(s)
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05 53 28.4 -01 48 23 OMC = NAME Orion Molecular Cloud
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 118 1 Information on datacube
fits/* . 1 Fits datacube
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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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- 32 I3 --- Nz Number of pixels along Z-axis
34- 39 I6 m/s bVRAD Lower value of VRAD interval
41- 45 I5 m/s BVRAD Upper value of VRAD interval
47- 49 I3 m/s dVRAD VRAD resolution
51- 57 I7 Kibyte size Size of FITS file
59- 76 A18 --- FileName Name of FITS file, in subdirectory fits
78-118 A41 --- Title Title of the FITS file
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Acknowledgements:
Ronan Higgins, higgins(at)ph1.uni-koeln.de
(End) Patricia Vannier [CDS] 01-Jun-2021