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NAG08 - VLBI Observations of Water Masers in Onsala1: Massive Binary Star-Forming Site?

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Short title: Nagayama et al. (2008)
Authors: Nagayama, TakumiNakagawa, AkiharuImai, HiroshiOmodaka, ToshihiroSofue, Yoshiaki
Journal: Publications of the Astronomical Society of Japan, Vol.60, No.2, pp.183--190
Bibcode:

Target type: HII
Transitions: H2O_22

Abstract
We present the proper motions of water masers toward the Onsala1 star-forming region, observed with the Japanese VLBI network at three epochs spanning 290days. We found that there are two water-maser clusters (WMC 1 and WMC 2) separated from each other by 1.6'' (2900AU at a distance of 1.8kpc). A proper-motion measurement revealed that WMC1 is associated with a bipolar outflow elongated in the east-west direction with an expansion velocity of 69±11kms-1. WMC1 and WMC2 are associated with two 345GHz continuum dust emission sources, which are located 2'' (3600AU) east from the core of an ultracompact HII region traced by 8.4GHz radio continuum emission. This indicates that the star-formation activity of Onsala1 could move from the west side of the ultracompact HII region to the east side of two young stellar objects associated with the water masers. We have also found that the WMC1 and UC HII regions could be gravitationally bound. Their relative velocity along the line of sight is ~3 km s-1, and the total mass is ~37 M⊙. Onsala1 seems to harbor a binary star at a different evolutionary stage.

Abstract

We present the proper motions of water masers toward the Onsala1 star-forming region, observed with the Japanese VLBI network at three epochs spanning 290days. We found that there are two water-maser clusters (WMC 1 and WMC 2) separated from each other by 1.6'' (2900AU at a distance of 1.8kpc). A proper-motion measurement revealed that WMC1 is associated with a bipolar outflow elongated in the east-west direction with an expansion velocity of 69±11kms-1. WMC1 and WMC2 are associated with two 345GHz continuum dust emission sources, which are located 2'' (3600AU) east from the core of an ultracompact HII region traced by 8.4GHz radio continuum emission. This indicates that the star-formation activity of Onsala1 could move from the west side of the ultracompact HII region to the east side of two young stellar objects associated with the water masers. We have also found that the WMC1 and UC HII regions could be gravitationally bound. Their relative velocity along the line of sight is ~3 km s-1, and the total mass is ~37 M⊙. Onsala1 seems to harbor a binary star at a different evolutionary stage.

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Detection table from Nagayama et al. (2008)

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Obs. RA	Obs. Dec	RA offset	Dec offset	#	Source name	V_peak	F_peak
(J2000)	(J2000)	(mas)	(mas)			(km/s)	(Jy)

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 'NAG08' 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 'NAG08' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

NAG08 - VLBI Observations of Water Masers in Onsala1: Massive Binary Star-Forming Site?

Interferometry data

View as list of objects

Detection table from Nagayama et al. (2008)