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CHE17 - Tianma 65-m telescope detection of new OH maser features towards the water fountain source IRAS 18286-0959

Short title: Chen et al. (2017)
Authors: Chen, XiShen, Zhi-QiangLi, Xiao-QiongYang, KaiNakashima, Jun-ichiWu, Ya-JunZhao, Rong-BinLi, JuanWang, Jun-ZhiJiang, Dong-RongWang, Jin-QingLi, BinZhong, Wei-YeYung, Bosco H. K.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 3, p.3602-3606
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: single-dish
Transitions: OH_1612,OH_1665,OH_1667

Abstract
We report the results of the OH maser observation towards the water fountain source IRAS 18286-0959 using the newly built Shanghai Tianma 65-m Radio Telescope. We observed the three OH ground state transition lines at frequencies of 1612, 1665 and 1667 MHz. Comparing with the spectra of previous observations, we find new maser spectral components at velocity channels largely shifted from the systemic velocity: the velocity offsets of the newly found components lie in the range 20-40 km s^-1 with respect to the systemic velocity. Besides maser variability, another possible interpretation for the newly detected maser features is that part of the molecular gas in the circumstellar envelope is accelerated. The acceleration is probably caused by the passage of a high-velocity molecular jet, which has been detected in previous Very Long Baseline Interferometry observations in the H₂O maser line.

Abstract

We report the results of the OH maser observation towards the water fountain source IRAS 18286-0959 using the newly built Shanghai Tianma 65-m Radio Telescope. We observed the three OH ground state transition lines at frequencies of 1612, 1665 and 1667 MHz. Comparing with the spectra of previous observations, we find new maser spectral components at velocity channels largely shifted from the systemic velocity: the velocity offsets of the newly found components lie in the range 20-40 km s^-1 with respect to the systemic velocity. Besides maser variability, another possible interpretation for the newly detected maser features is that part of the molecular gas in the circumstellar envelope is accelerated. The acceleration is probably caused by the passage of a high-velocity molecular jet, which has been detected in previous Very Long Baseline Interferometry observations in the H₂O maser line.

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Detection table from Chen et al. (2017)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Image	Line	Frequency	V_peak	FWHM	F_peak	∫F dv	Telescope	V_step	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					OH	(MHz)	(km/s)	(km/s)	(Jy)	(Jy*km/s)		(km/s)	(mJy)	(arcsec)	Yes/No		(kpc)
1	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1612 MHz;	1612	-0.5	2.1	0.162	0.42	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1612 MHz;	1612	12.1	1.8	0.102	0.23	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1612 MHz;	1612	43.6	2.4	-0.048	-0.14	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1612 MHz;	1612	52.9	5.1	0.054	0.34	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1612 MHz;	1612	65.4	2	-0.064	-0.16	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1612 MHz;	1612	72.6	2.9	0.105	0.38	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
7	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1665 MHz;	1665	20.5	2.6	0.09	0.29	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1665 MHz;	1665	43.3	3.5	-0.019	-0.08	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
9	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1667 MHz;	1667	2.6	2	0.053	0.13	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1667 MHz;	1667	9	2	0.05	0.12	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April
	18 31 22.1	-09 57 23	21.7948	-0.1246	G21.797-0.127	G21.7960-0.1272	IRAS 18286-0959	Image	1667 MHz;	1667	43.7	3.8	-0.046	-0.22	TMRT	0.5	16.000	480	+H₂O +OH -SiO	SFR_MIXED		2016 March and April

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

select MAX(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.grpv) as grpv,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.line) as line,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.pol) as pol,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_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 oh_data_all  LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'CHE17' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.grpv,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.line,oh_data_all.freq,oh_data_all.pol,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'CHE17' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

CHE17 - Tianma 65-m telescope detection of new OH maser features towards the water fountain source IRAS 18286-0959

View as list of objects

Detection table from Chen et al. (2017)