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ZHA99 - Shock-heated NH₃ in a Molecular Jet Associated with a High-Mass Young Star

Short title: Zhang et al. (1999)
Authors: Zhang, QizhouHunter, Todd R.Sridharan, T. K.Cesaroni, Riccardo
Journal: The Astrophysical Journal, Volume 527, Issue 2, pp. L117-L120.
Bibcode:

Target type: High_mass_SFR
Transitions: NH3_(3,3)

Abstract
We present the discovery of shock-excited NH₃ in a well-collimated jet associated with the extremely young high-mass star IRAS 20126+4104. The NH₃ (3, 3) and (4, 4) emission is dominated by three clumps along the SiO jet. At the end of the jet, there exists strong and broad (+/-10 km s^-1) NH₃ (3, 3) emission. With typical brightness temperatures greater than 500 K, the overall emission indicates a weakly inverted population and appears in an arc, consistent with the excitation by bow shocks. There are two bright spots in the NH₃ (3, 3) emission with brightness temperatures of approximately 2000 K. The narrow line width (1.5 km s^-1 FWHM), the small sizes (<0.3

Abstract

We present the discovery of shock-excited NH₃ in a well-collimated jet associated with the extremely young high-mass star IRAS 20126+4104. The NH₃ (3, 3) and (4, 4) emission is dominated by three clumps along the SiO jet. At the end of the jet, there exists strong and broad (+/-10 km s^-1) NH₃ (3, 3) emission. With typical brightness temperatures greater than 500 K, the overall emission indicates a weakly inverted population and appears in an arc, consistent with the excitation by bow shocks. There are two bright spots in the NH₃ (3, 3) emission with brightness temperatures of approximately 2000 K. The narrow line width (1.5 km s^-1 FWHM), the small sizes (<0.3

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Detection table from Zhang 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	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					NH₃	(km/s)	(mJy/beam)		(arcsec)	Yes/No		(kpc)
1	20 14 26.7	+41 13 30	78.1228	3.6306	G78.122+3.633	IRAS 2012614104	Image	Descr	(3,3);	-3.7	79	NRAOVLA	1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1999 March 27 and May 29

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(nh3_data_all.ra_hms) as ra_hms,MAX(nh3_data_all.dec_dms) as dec_dms,MAX(nh3_data_all.source_name) as source_name,MAX(nh3_data_all.ra) as ra,MAX(nh3_data_all.dec) as dec,MAX(nh3_data_all.l) as l,MAX(nh3_data_all.b) as b,MAX(nh3_data_all.grp) as grp,MAX(nh3_data_all.other_name) as other_name,MAX(nh3_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(nh3_data_all.line) as line,MAX(nh3_data_all.vrange) as vrange,MAX(nh3_data_all.vpeak) as vpeak,MAX(nh3_data_all.peak) as peak,MAX(nh3_data_all.fwhm) as fwhm,MAX(nh3_data_all.int) as int,MAX(nh3_data_all.rms) as rms,MAX(nh3_data_all.units) as units,MAX(nh3_data_all.units_rms) as units_rms,MAX(nh3_data_all.date_txt) as date_txt,MAX(nh3_data_all.telescope_ref) as telescope_ref,MAX(nh3_data_all.telescope_conf) as telescope_conf,MAX(nh3_data_all.v_step) as v_step,MAX(nh3_data_all.beam) as beam,MAX(nh3_data_all.beam_maj) as beam_maj,MAX(nh3_data_all.beam_min) as beam_min,MAX(nh3_data_all.beam_pa) as beam_pa,MAX(nh3_data_all.ref) as ref,MAX(nh3_data_all.list_ref) as list_ref,MAX(nh3_data_all.ascii) as ascii,MAX(nh3_data_all.url) as url,MAX(nh3_data_all.image) as image,MAX(nh3_data_all.image2) as image2,MAX(nh3_data_all.image3) as image3,MAX(nh3_data_all.descr) as descr,MAX(nh3_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(nh3_data_all.dist) as dist,1 as dist_parallax,MAX(nh3_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 nh3_data_all  LEFT JOIN all_objects_withmet ON nh3_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 nh3_data_all.line=transitions."Line"  WHERE ref ilike 'ZHA99' AND detected=true AND hide=false GROUP BY ref

select nh3_data_all.ra_hms,nh3_data_all.dec_dms,nh3_data_all.source_name,nh3_data_all.ra,nh3_data_all.dec,nh3_data_all.l,nh3_data_all.b,nh3_data_all.grp,nh3_data_all.other_name,nh3_data_all.other_desc,nh3_data_all.thermal,nh3_data_all.line,nh3_data_all.vrange,nh3_data_all.vpeak,nh3_data_all.peak,nh3_data_all.fwhm,nh3_data_all.int,nh3_data_all.rms,nh3_data_all.units,nh3_data_all.units_rms,nh3_data_all.date_txt,nh3_data_all.telescope_ref,nh3_data_all.telescope_conf,nh3_data_all.v_step,nh3_data_all.beam,nh3_data_all.beam_maj,nh3_data_all.beam_min,nh3_data_all.beam_pa,nh3_data_all.ref,nh3_data_all.list_ref,nh3_data_all.ascii,nh3_data_all.url,nh3_data_all.image,nh3_data_all.image2,nh3_data_all.image3,nh3_data_all.descr,nh3_data_all.id,nh3_data_all.mjy_flag,nh3_data_all.rms_mjy_flag,nh3_data_all.dist,nh3_data_all.dist_parallax,nh3_data_all.date_txt,line_det,type,simbad_types_cat FROM nh3_data_all   LEFT JOIN all_objects_withmet ON nh3_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 nh3_data_all.line=transitions."Line"  WHERE ref ilike 'ZHA99' AND detected=true AND hide=false ORDER BY detected DESC,id

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ZHA99 - Shock-heated NH3 in a Molecular Jet Associated with a High-Mass Young Star

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Detection table from Zhang et al. (1999)

ZHA99 - Shock-heated NH₃ in a Molecular Jet Associated with a High-Mass Young Star