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OMO99 - The Enormous Outburst of the 7.9 km s^-1 Water-Maser Feature in Orion KL

Short title: Omodaka et al. (1999)
Authors: Omodaka, ToshihiroMaeda, ToshihisaMiyoshi, MakotoOkudaira, AtuyaNishio, MasanoriMiyaji, TakeshiMotiduki, NanakoMorimoto, MasakiKobayashi, HideyukiSasao, Tetsuo
Journal: Publications of the Astronomical Society of Japan, v.51, p.333-336.
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Target type: High_mass_SFR
Transitions: H2O_22

Abstract
We report on a spectacular flare in the water-vapor maser emission from the KL nebula, which we found in 1997 December. The flare, at a velocity of 7.9 km s\({^{-1}\)}, continued to increase in intensity exponentially and had a flux density greater than 3.5\(\times10^6\) Jy. The central velocity of the flare component was 7.9 km s\({^{-1}\)} and the line width was less than 40 kHz. We did not detect a ``rapid'' time variation in the intensity. The flare component is currently increasing steadily. A preliminary VLBI observation was made using a Japanese domestic VLBI network, called J-Net, in order to determine the location of the flare. Its position is alpha =05^h32^m46^s.6, delta =-5^deg 24'27.''2\ (1950.0)+/- 1''. In this region, strong outbursts were reported during the period from 1979 August to 1985 November (Matveenko et al. 1988, AAA 49.131.147). Both the central velocity and the position of the present flare seems to be the same as that of previous ones. This suggests a common origin of these phenomena.

Abstract

We report on a spectacular flare in the water-vapor maser emission from the KL nebula, which we found in 1997 December. The flare, at a velocity of 7.9 km s\({^{-1}\)}, continued to increase in intensity exponentially and had a flux density greater than 3.5\(\times10^6\) Jy. The central velocity of the flare component was 7.9 km s\({^{-1}\)} and the line width was less than 40 kHz. We did not detect a ``rapid'' time variation in the intensity. The flare component is currently increasing steadily. A preliminary VLBI observation was made using a Japanese domestic VLBI network, called J-Net, in order to determine the location of the flare. Its position is alpha =05^h32^m46^s.6, delta =-5^deg 24'27.''2\ (1950.0)+/- 1''. In this region, strong outbursts were reported during the period from 1979 August to 1985 November (Matveenko et al. 1988, AAA 49.131.147). Both the central velocity and the position of the present flare seems to be the same as that of previous ones. This suggests a common origin of these phenomena.

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Detection table from Omodaka et al. (1999)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Descr.	Line	V_peak	F_peak	Telescope	V_step	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					H₂O	(km/s)	(Jy)		(km/s)	Yes/No		(kpc)
1	05 35 14.5	-05 22 29.6	208.9928	-19.3846	G208.993-19.385	Orion KL	Image	Descr	22 GHz;	7.9	3.5E6	NRO	0.43	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	SFR_MIXED		1995 Sep

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 Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_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 h2o_data_all  LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line"  WHERE ref ilike 'OMO99' AND detected=true AND hide=false GROUP BY ref

select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all   LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line"  WHERE ref ilike 'OMO99' AND detected=true AND hide=false ORDER BY detected DESC,id

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OMO99 - The Enormous Outburst of the 7.9 km s-1 Water-Maser Feature in Orion KL

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Detection table from Omodaka et al. (1999)

OMO99 - The Enormous Outburst of the 7.9 km s^-1 Water-Maser Feature in Orion KL