J/A+A/575/A9 M17-SW datacubes in C and CO lines (Perez-Beaupuits+, 2015)
Detection of a large fraction of atomic gas not associated with star-forming
material in M17 SW.
Perez-Beaupuits J.P., Stutzki J., Ossenkopf V., Spaans M., Gusten R.,
Wiesemeyer H.
<Astron. Astrophys. 575, A9 (2015)>
=2015A&A...575A...9P 2015A&A...575A...9P
ADC_Keywords: Carbon monoxide ; H II regions ; Nebulae ; Radio lines ;
Millimetric/submm sources ; Molecular clouds ; Spectroscopy
Keywords: ISM: atoms - ISM: molecules - submillimeter: ISM - ISM: clouds
Abstract:
We probe the column densities and masses traced by the ionized [CII]
and neutral [CI] atomic carbon with spectrally resolved maps, and
compare them to the diffuse and dense molecular gas traced by [CI] and
low-J CO lines toward the star-forming region M17 SW. We mapped a
4.1pcx4.7pc region in the [CI] 609µm line using the APEX telescope,
as well as the CO isotopologues with the IRAM 30m telescope. Data are
analyzed based on velocity channel maps that are 1km/s wide. We
correlate their spatial distribution with that of the [CII] map
obtained with SOFIA/GREAT. Optically thin approximations were used to
estimate the column densities of [CI] and [CII] in each velocity
channel.
Description:
The FITS files contain the data cubes corresponding to the most
relevant spectral lines used in our work: The 12CO(1-0),
13CO(1-0), C18O(2-1), [CI](1-0), [CI](2-1), [CII] and H41α
lines, observed over a region of about 310"x120" towards the M17 SW
nebula. They were obtained using the IRAM 30m telescope, the Atacama
Pathfinder EXperiment (APEX) telescope, and the German REceiver for
Astronomy at Terahertz frequencies (GREAT) on board the Stratospheric
Observatory For Infrared Astronomy (SOFIA) with varying angular
resolutions. They have all been convolved to a common angular
resolution of 24", except for the H41α line which was convolved
to an angular resolution of 30" to improve the S/N. The velocity
resolution of all the data cubes is 1km/s.
Objects:
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RA (2000) DE Designation(s)
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18 20 27.64 -16 12 00.9 M17 SW = SAO 161357
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 83 7 List of FITS data cubes
fits/* . 7 Individual FITS data cubes
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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 F4.1 arcsec/pix Scale [12/15.5] Scale of the image
25- 26 I2 --- Nx [21/31] Number of pixels along X-axis
28- 29 I2 --- Ny [15/18] Number of pixels along Y-axis
31- 33 I3 --- Nz [41/141] Number of slides
35- 37 I3 km/s V.min [-60/0] Lower value of velocity interval
39- 40 I2 km/s V.max [40/80] Upper value of velocity interval
42 I1 km/s dVel [1] Velocity resolution [km/s]
44- 46 I3 Kibyte size [98/183] Size of FITS file
48- 66 A19 --- FileName Name of FITS file, in subdirectory fits
68- 83 A16 --- Title Title of the file
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Acknowledgements:
Juan-Pablo Perez-Beaupuits, jp(at)mpifr.de,
Max-Planck Institute for Radio Astronomy, Bonn, Germany
(End) Juan-Pablo Perez-Beaupuits [MPIfR], Patricia Vannier [CDS] 12-Jan-2015