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SJO11 - Expanded VLA Detection of 36.2 GHz Class I Methanol Masers in Sagittarius A

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Short title: Sjouwerman et al. (2011)
Authors: Sjouwerman, L. O. Pihlström, Y. M. Fish, V. L.
Journal: The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies. Proceedings of a workshop held at Shanghai, China on October 19-23, 2009. Edited by Mark R. Morris, Q. Daniel Wang, and Feng Yuan. San Francisco: Astronomical Society of the Pacific, 2011, p.75
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Target type: Galaxy_center
Transitions: SiO_1-0v0,CH3OH_36(I),CH3OH_44(I),CH3OH_95(I),CH3OH_132(I),CH3OH_6(II)

Abstract
We present interferometric detection of 36.2 GHz Class I methanol emission with the new Expanded VLA Ka band receivers. For the first time the brightness temperatures of the detections unambiguously indicate that the emission is maser emission. Adopting that the 36 GHz maser emission originates in shocked material, like the 44 GHz methanol maser, the methanol traces different shocks than the 1720 MHz OH masers. Also, 36 GHz and 44 GHz masers do not necessarily co-exist and may trace different methanol gas. We suggest that the 36 GHz methanol masers outline regions of cloud-cloud collisions.

Abstract

We present interferometric detection of 36.2 GHz Class I methanol emission with the new Expanded VLA Ka band receivers. For the first time the brightness temperatures of the detections unambiguously indicate that the emission is maser emission. Adopting that the 36 GHz maser emission originates in shocked material, like the 44 GHz methanol maser, the methanol traces different shocks than the 1720 MHz OH masers. Also, 36 GHz and 44 GHz masers do not necessarily co-exist and may trace different methanol gas. We suggest that the 36 GHz methanol masers outline regions of cloud-cloud collisions.

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Detection table from Sjouwerman et al. (2011)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Maser spot	Source name	Image	Line	V_peak	F_peak	∫F dv	Telescope	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						CH₃OH (class I)	(km/s)	(Jy)	(Jy*km/s)		(arcsec)	Yes/No		(kpc)
1	+17 45 41.25	-29 00 58.1			359.939435	-0.054264	G359.9846-0.0672			Sgr A	Image	36 GHz (I);	21.5 .. 50.7	0.52 .. 215	..	NRAOVLA	0.2 x 0.4	+CH₃OH I +OH +SiO	SFR_MIXED		2009 March and April
	+17 45 41.25	-29 00 58.1	0 mas	0 mas	359.939435	-0.054264		1	1	Sgr A			21.5	0.95
	+17 45 42.3	-29 01 53.4	15750 mas	-55299.6 mas	359.928315	-0.065531		2	2	Sgr A			23.1	0.67
	+17 45 42.41	-29 01 58.5	17400 mas	-60399.6 mas	359.927314	-0.066611		3	3	Sgr A			25.6	0.76
	+17 45 43.6	-29 00 31.4	35250 mas	26700.4 mas	359.950226	-0.057711		4	4	Sgr A			24	3.86
	+17 45 43.93	-29 00 19.7	40200 mas	38400.4 mas	359.953627	-0.057044		5	5	Sgr A			50.7	0.52
	+17 45 49.36	-28 58 53.3	121650 mas	124800 mas	359.984421	-0.061441		6	6	Sgr A			45	154
	+17 45 49.55	-28 59 0.6	124500 mas	117500 mas	359.983051	-0.063088		7	7	Sgr A			48.2	62.4
	+17 45 50.1	-28 59 40.2	132750 mas	77900.4 mas	359.974703	-0.070527		8	8	Sgr A			39.3	215
	+17 45 50.45	-29 00 5.4	138000 mas	52700.4 mas	359.969390	-0.075260		9	9	Sgr A			49.9	60.4
	+17 45 52	-28 58 53.1	161250 mas	125000 mas	359.989478	-0.069628		10	10	Sgr A			48.2	35.1

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

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.telescope_conf) as telescope_conf,MAX(met1_data_all.v_step) as v_step,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.url) as url,MAX(met1_data_all.image) as image,MAX(met1_data_all.image2) as image2,MAX(met1_data_all.image3) as image3,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,1 as dist_parallax,MAX(met1_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM met1_data_all  LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met1_data_all.line=transitions."Line"  WHERE ref ilike 'SJO11' 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.telescope_conf,met1_data_all.v_step,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.url,met1_data_all.image,met1_data_all.image2,met1_data_all.image3,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.dist_parallax,met1_data_all.date_txt,line_det,type,simbad_types_cat FROM met1_data_all   LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met1_data_all.line=transitions."Line"  WHERE ref ilike 'SJO11' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

SJO11 - Expanded VLA Detection of 36.2 GHz Class I Methanol Masers in Sagittarius A

Interferometry data

View as list of objects

Detection table from Sjouwerman et al. (2011)