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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:

Target type: IRDC
Transitions: SiO_1-0v0,CH3OH_36(I),CH3OH_44(I),CH3OH_95(I),CH3OH_132(I)

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 CH₃OH at 44 GHz with additional weak 22 GHz H₂O 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 NH₃ 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

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 CH₃OH at 44 GHz with additional weak 22 GHz H₂O 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 NH₃ 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:

Comments:
Infrared Dark Cloud G359.94+0.17

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Detection table from Deguchi et al. (2012b)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	T_a	∫T_a dv	Telescope	RMS	Beam	Detection	Date
	(J2000)	(J2000)	(deg.)	(deg.)			CH₃OH (class I)	(km/s)	(K)	(K*km/s)		(Jy)	(arcsec)	Yes/No
1	17 44 53.7	-28 54 4.1	359.9470	0.1538	G359.947+0.154	G359.94+0.17	44 GHz (I)	16.5	18.029	19.245	NRO	0.087	40	+H₂O +CH₃OH I +SiO	2011 February 26

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K	2MASS K

select MAX(met1_data_all.ra_hms) as ra_hms,MAX(met1_data_all.dec_dms) as dec_dms,MAX(met1_data_all.source_name) as source_name,MAX(met1_data_all.ra) as ra,MAX(met1_data_all.dec) as dec,MAX(met1_data_all.l) as l,MAX(met1_data_all.b) as b,MAX(met1_data_all.grp) as grp,MAX(met1_data_all.other_name) as other_name,MAX(met1_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met1_data_all.line) as line,MAX(met1_data_all.vrange) as vrange,MAX(met1_data_all.vpeak) as vpeak,MAX(met1_data_all.peak) as peak,MAX(met1_data_all.fwhm) as fwhm,MAX(met1_data_all.int) as int,MAX(met1_data_all.rms) as rms,MAX(met1_data_all.units) as units,MAX(met1_data_all.units_rms) as units_rms,MAX(met1_data_all.date_txt) as date_txt,MAX(met1_data_all.telescope_ref) as telescope_ref,MAX(met1_data_all.beam) as beam,MAX(met1_data_all.beam_maj) as beam_maj,MAX(met1_data_all.beam_min) as beam_min,MAX(met1_data_all.beam_pa) as beam_pa,MAX(met1_data_all.ref) as ref,MAX(met1_data_all.list_ref) as list_ref,MAX(met1_data_all.ascii) as ascii,MAX(met1_data_all.image) as image,MAX(met1_data_all.descr) as descr,MAX(met1_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met1_data_all.dist) as dist,MAX(met1_data_all.date_txt) as date_txt,MAX(line_det) as line_det FROM met1_data_all  LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name  LEFT JOIN transitions ON met1_data_all.line=transitions."Line"  WHERE ref ilike 'DEG12B' AND detected=true AND hide=false GROUP BY ref

select met1_data_all.ra_hms,met1_data_all.dec_dms,met1_data_all.source_name,met1_data_all.ra,met1_data_all.dec,met1_data_all.l,met1_data_all.b,met1_data_all.grp,met1_data_all.other_name,met1_data_all.other_desc,met1_data_all.thermal,met1_data_all.line,met1_data_all.vrange,met1_data_all.vpeak,met1_data_all.peak,met1_data_all.fwhm,met1_data_all.int,met1_data_all.rms,met1_data_all.units,met1_data_all.units_rms,met1_data_all.date_txt,met1_data_all.telescope_ref,met1_data_all.beam,met1_data_all.beam_maj,met1_data_all.beam_min,met1_data_all.beam_pa,met1_data_all.ref,met1_data_all.list_ref,met1_data_all.ascii,met1_data_all.image,met1_data_all.descr,met1_data_all.id,met1_data_all.mjy_flag,met1_data_all.rms_mjy_flag,met1_data_all.dist,met1_data_all.date_txt,line_det FROM met1_data_all   LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name  LEFT JOIN transitions ON met1_data_all.line=transitions."Line"  WHERE ref ilike 'DEG12B' AND detected=true AND hide=false ORDER BY detected DESC,id

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DEG12B - Maser Emission toward the Infrared Dark Cloud G359.94+0.17 Seen in Silhouette against the Galactic Center

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Detection table from Deguchi et al. (2012b)