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HUN99 - Molecular Jets and H_2O Masers in the AFGL 5142 Hot Core

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Short title: Hunter et al. (1999)
Authors: Hunter, T. R.Testi, L.Zhang, Q.Sridharan, T. K.
Journal: The Astronomical Journal, Volume 118, Issue 1, pp. 477-487.
Bibcode:

Target type: High_mass_SFR
Transitions: H2O_22

Abstract
We present centimeter and millimeter continuum and molecular line images of the massive star-forming region AFGL 5142. A compact (2.5'') millimeter continuum core with integrated flux density of 125 mJy has been detected at 88 GHz. The emission peak coincides with a 1.5 mJy centimeter continuum source. A massive (~35 M_solar) highly collimated north-south outflow emanating from the core is seen in both the HCO^+ (1-0) and SiO (v=0, J=2-1) transitions. The millimeter continuum source coincides with a molecular core traced by the ambient velocity HCO^+ (1-0), SiO (v=0, J=2-1), and H^13CO^+ (1-0) emission. CH_3CN (14-13) and (12-11) spectra indicate a gas temperature of approximately 65 K in the innermost core. While the millimeter continuum emission is probably mostly due to optically thin thermal emission from dust grains, the centimeter continuum source is consistent with an ionized wind. From the Lyman continuum flux required to sustain the ionized gas, we estimate that the exciting source should be a B2 or earlier zero-age main-sequence star. The 22 GHz H_2O masers most closely associated with the central object have undergone substantial variability in flux and position during three epochs spread over eight years. In addition, two new water maser features have been detected significantly offset (3''-4'', 0.03 pc) from the centimeter continuum peak position. One of these maser features exhibits a linear structure of spots with spatial-kinematic evidence for a rotating circumstellar disk of radius 40 AU and dynamical mass of ~1 M_solar. The other is found to be associated with a near-infrared source with large infrared excess. In addition to the 28 embedded stars previously seen in infrared images, we conclude that this cluster is concurrently forming both low- and high-mass stars.

Abstract

We present centimeter and millimeter continuum and molecular line images of the massive star-forming region AFGL 5142. A compact (2.5'') millimeter continuum core with integrated flux density of 125 mJy has been detected at 88 GHz. The emission peak coincides with a 1.5 mJy centimeter continuum source. A massive (~35 M_solar) highly collimated north-south outflow emanating from the core is seen in both the HCO^+ (1-0) and SiO (v=0, J=2-1) transitions. The millimeter continuum source coincides with a molecular core traced by the ambient velocity HCO^+ (1-0), SiO (v=0, J=2-1), and H^13CO^+ (1-0) emission. CH_3CN (14-13) and (12-11) spectra indicate a gas temperature of approximately 65 K in the innermost core. While the millimeter continuum emission is probably mostly due to optically thin thermal emission from dust grains, the centimeter continuum source is consistent with an ionized wind. From the Lyman continuum flux required to sustain the ionized gas, we estimate that the exciting source should be a B2 or earlier zero-age main-sequence star. The 22 GHz H_2O masers most closely associated with the central object have undergone substantial variability in flux and position during three epochs spread over eight years. In addition, two new water maser features have been detected significantly offset (3''-4'', 0.03 pc) from the centimeter continuum peak position. One of these maser features exhibits a linear structure of spots with spatial-kinematic evidence for a rotating circumstellar disk of radius 40 AU and dynamical mass of ~1 M_solar. The other is found to be associated with a near-infrared source with large infrared excess. In addition to the 28 embedded stars previously seen in infrared images, we conclude that this cluster is concurrently forming both low- and high-mass stars.

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Detection table from Hunter et al. (1999)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	∫F dv	Telescope	Configuration	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(Jy*km/s)			(mJy/beam)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+05 30 48.0262	+33 47 53.4653			174.201058	-0.07072	G174.198-0.076		AFGL 5142	Image	Descr	22 GHz;		NRAOVLA	ext. A	71.000	0.0786 x 0.0704	-26	+H₂O +CH₃OH I +CH₃OH II	GALAXY		1998 March 27
	+05 30 48.0132	+33 47 53.3472	-195.089 mas	-118.805 mas	174.201061	-0.070776		1	AFGL 5142				3.01
	+05 30 48.0288	+33 47 54.6721	39.2469 mas	1206.09 mas	174.200783	-0.070528		2	AFGL 5142				3.2
	+05 30 48.0377	+33 47 54.4484	172.749 mas	982.442 mas	174.200852	-0.070537		3	AFGL 5142				5.51
	+05 30 47.7539	+33 47 53.0899	-4083.64 mas	-376.093 mas	174.200627	-0.071565		4	AFGL 5142				44.05
	+05 30 47.953	+33 47 50.9685	-1097.07 mas	-2497.5 mas	174.201498	-0.071313		5	AFGL 5142				14.01
	+05 30 48.0272	+33 47 53.4192	15.5073 mas	-46.8174 mas	174.201071	-0.070724		6	AFGL 5142				16.77
	+05 30 48.0319	+33 47 54.9609	86.2801 mas	1494.87 mas	174.200722	-0.070475		7	AFGL 5142				0.23
	+05 30 48.037	+33 47 55.1445	162.594 mas	1678.5 mas	174.200689	-0.070432		8	AFGL 5142				0.41
	+05 30 48.0828	+33 47 54.7202	849.949 mas	1254.19 mas	174.200875	-0.070364		9	AFGL 5142				0.32

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 'HUN99' 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 'HUN99' AND detected=true AND hide=false ORDER BY detected DESC,id

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HUN99 - Molecular Jets and H_2O Masers in the AFGL 5142 Hot Core

Interferometry data

View as list of objects

Detection table from Hunter et al. (1999)