J/A+A/599/A135 NH3 Odin observations towards Sgr A (Sandqvist+, 2017)
Odin observations of ammonia in the Sgr A +50 km/s cloud and circumnuclear disk.
Sandqvist Aa., Hjalmarson A., Frisk U., Lundin S., Nordh L., Olberg M.,
Olofsson G.
<Astron. Astrophys. 599, A135 (2017)>
=2017A&A...599A.135S 2017A&A...599A.135S (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Molecular clouds ; Radio lines
Keywords: Galaxy: centre - ISM: individual objects: Sgr A - ISM: molecules -
ISM: clouds
Abstract:
The Odin satellite is now into its sixteenth year of operation, much
surpassing its design life of two years. One of the sources which Odin
has observed in great detail is the Sgr A Complex in the centre of the
Milky Way. The aim is to study the presence of NH3 in the Galactic
Centre and spiral arms. Recently, Odin has made complementary
observations of the 572GHz NH3 line towards the Sgr A +50km/s cloud
and Circumnuclear Disk (CND). Significant NH3 emission has been
observed in both the +50km/s cloud and the CND. Clear NH3 absorption
has also been detected in many of the spiral arm features along the
line of sight from the Sun to the core of our Galaxy. The very large
velocity width (80km/s) of the NH3 emission associated with the
shock region in the southwestern part of the CND may suggest a
formation/desorption scenario similar to that of gas-phase H2O in
shocks/outflows.
Description:
50nh3cds.fit (Fig. 1 in paper). Odin observations of the 572GHz NH3
line towards the Sgr A +50km/s Cloud (J2000.0 17:45:51.7, -28:59:09the
channel resolution is 1.6km/s.
cndnh3cd.fit (Fig. 2 in paper). Odin observations of the 572GHz NH3
line towards the south-western part of the Sgr A Circumnuclear Disk
(J2000.0 17:45:39.7, -29:01:18); the channel resolution is 1.6km/s.
cndh218o.fit (Fig. 3 in paper). Odin observations of the 548GHz
H218O line towards the southwestern part of the Sgr A
Circumnuclear Disk (J2000.0 17:45:39.7, -29:01:18); the channel
resolution is 3km/s.
Objects:
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RA (2000) DE Designation(s)
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17 45 40.04 -29 00 28.2 Sgr A = NAME Sgr A*
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 182 3 List of fits spectra
fits/* . 3 Individual fits spectra
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See also:
J/other/Sci/348.413 : Sgr A East SNR multiwavelength images (Lau+, 2015)
J/ApJ/802/69 : VLA, ALMA and SMA monitoring of Sgr A* (Bower+, 2015)
J/A+A/589/A116 : Multiwavelength study of Sgr A* (Mossoux+, 2016)
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- 22 I3 --- Nx Number of pixels along X-axis
24- 34 E11.7 Hz bFreq Lower value of interval frequency
36- 46 E11.7 Hz BFreq Upper value of interval frequency
48- 58 E11.7 Hz dFreq Frequency resolution
60 I1 Kibyte size Size of FITS file
62- 73 A12 --- FileName Name of FITS file, in subdirectory fits
75-183 A109 --- Title Title of the FITS file
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Acknowledgements:
Aage Sandqvist, aage(at)astro.su.se
References:
Karlsson et al., 2013A&A...554A.141K 2013A&A...554A.141K,
Hydroxyl, water, ammonia, carbon monoxide, and neutral carbon towards the
Sagittarius A complex. VLA, Odin, and SEST observations.
(End) Aage Sandqvist [Stockholm Obs.], Patricia Vannier [CDS] 10-Feb-2017