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Data:
H
2
O
,
SiO
,
CH3OH_I
DEG12B - Maser Emission toward the Infrared Dark Cloud G359.94+0.17 Seen in Silhouette against the Galactic Center
Short title
: Deguchi et al. (2012b)
Authors
: Deguchi, Shuji Tafoya, Daniel Nagisa, Shino
Journal
: Publications of the Astronomical Society of Japan, Vol.64, No.2, article id.28,
6
pp.
Bibcode
:
2012PASJ...64...28D
PDF
:
DEG12B.pdf
Abstract
The infrared dark cloud G359.94+0.17 is a conspicuous, opaque cloud, which is seen in silhouette against the Galactic center. We found unexpectedly strong (&tilde 50 Jy) maser emission of CH
3
OH at 44 GHz with additional weak 22 GHz H
2
O maser and 43 GHz SiO thermal emissions toward this cloud. Detections of these molecular lines indicate that strong star-forming activities are proceeding in this cloud, which was not reported previously despite of numerous studies toward the Galactic center. The line profiles of the NH
3
inversion lines at 23 GHz indicate that G359.94+0.17 is composed of mainly two clouds with V
1sr
= 0, and 15 km s
-1
overlapped on the line of sight. The maser emission is associated with the 15 km s
-1
cloud, suggesting that it is located at the Norma spiral arm. eprintid:
arXiv:1109.0677
Comments:
Infrared Dark Cloud G359.94+0.17
Input tables
: Table 1
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Detection table from Deguchi et al. (2012b)
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individual components
ID
Obs. RA
Obs. Dec
l
b
Source name
Line
V
peak
T
a
∫T
a
dv
Telescope
RMS
Beam
(J2000)
(J2000)
(deg.)
(deg.)
CH
3
OH (class I)
(km/s)
(K)
(K*km/s)
(Jy)
(arcsec)
1
17 44 53.7
-28 54 4.1
359.9470
0.1538
G359.94+0.17
44 GHz (I)
16.5
18.029
19.245
NRO
0.087
40
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DEG12B.pdf
