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ZHA13 - Parallaxes for W49N and G048.60+0.02: Distant Star Forming Regions in the Perseus Spiral Arm

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Short title: Zhang et al. (2013)
Authors: Zhang, B.Reid, M. J.Menten, K. M.Zheng, X. W.Brunthaler, A.Dame, T. M.Xu, Y.
Journal: The Astrophysical Journal, Volume 775, Issue 1, article id. 79, 13 pp. (2013).
Bibcode:

Target type: High_mass_SFR

Abstract
We report trigonometric parallax measurements of 22 GHz H₂O masers in two massive star-forming regions from Very Long Baseline Array observations as part of the Bar and Spiral Structure Legacy Survey. The distances of 11.11^{+0.79}_{-0.69} kpc to W49N (G043.16+0.01) and 10.75^{+0.61}_{-0.55} kpc to G048.60+0.02 locate them in a distant section of the Perseus arm near the solar circle in the first Galactic quadrant. This allows us to locate accurately the inner portion of the Perseus arm for the first time. Combining the present results with sources measured in the outer portion of the arm in the second and third quadrants yields a global pitch angle of 9.Â�5 Â� 1.Â�3 for the Perseus arm. We have found almost no H₂O maser sources in the Perseus arm for 50Â�

Abstract

We report trigonometric parallax measurements of 22 GHz H₂O masers in two massive star-forming regions from Very Long Baseline Array observations as part of the Bar and Spiral Structure Legacy Survey. The distances of 11.11^{+0.79}_{-0.69} kpc to W49N (G043.16+0.01) and 10.75^{+0.61}_{-0.55} kpc to G048.60+0.02 locate them in a distant section of the Perseus arm near the solar circle in the first Galactic quadrant. This allows us to locate accurately the inner portion of the Perseus arm for the first time. Combining the present results with sources measured in the outer portion of the arm in the second and third quadrants yields a global pitch angle of 9.Â�5 Â� 1.Â�3 for the Perseus arm. We have found almost no H₂O maser sources in the Perseus arm for 50Â�

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Detection table from Zhang et al. (2013)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_peak	F_peak	Telescope	V_step	Beam	PA	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(Jy/beam)		(km/s)	(arcsec)	(deg.)	Yes/No		(kpc)	(kpc)
1	+19 10 13.4096	+09 06 12.803			43.166405	0.011165	G43.167+0.011		G043.16+0.01	Image	Descr	22 GHz;	-46.46 .. 12.95	8000	VLBA	0.42	0.8 x 0.4		+H₂O +CH₃OH I +CH₃OH II +OH	MIXED	11.110		2010 Mar 13 - 2011 Apr 18
	+19 10 13.4057	+09 06 13.0725	-57.87 mas	270.85 mas	43.166464	0.011214		1	G043.16+0.01				12.95
	+19 10 13.4068	+09 06 12.864	-41.09 mas	62.44 mas	43.166415	0.011183		2	G043.16+0.01				12.95
	+19 10 13.4081	+09 06 12.7917	-21.86 mas	-9.88 mas	43.166399	0.011169		3	G043.16+0.01				8.31
	+19 10 13.4081	+09 06 12.7919	-21.89 mas	-9.73 mas	43.166399	0.011169		4	G043.16+0.01				7.89
	+19 10 13.4116	+09 06 13.1104	31.43 mas	308.78 mas	43.166484	0.011197		5	G043.16+0.01				4.94
	+19 10 13.4116	+09 06 13.1104	31.44 mas	308.77 mas	43.166484	0.011197		6	G043.16+0.01				4.52
	+19 10 13.4115	+09 06 13.1013	29.22 mas	299.72 mas	43.166482	0.011197		7	G043.16+0.01				1.99
	+19 10 13.4094	+09 06 12.7974	-2.08 mas	-4.18 mas	43.166403	0.011165		8	G043.16+0.01				-11.07
	+19 10 13.4054	+09 06 12.9984	-61.71 mas	196.77 mas	43.166445	0.011206		9	G043.16+0.01				-44.77
	+19 10 13.4089	+09 06 12.5021	-9 mas	-299.53 mas	43.166329	0.011129		10	G043.16+0.01				-46.04
	+19 10 13.4089	+09 06 12.5021	-8.98 mas	-299.52 mas	43.166329	0.011129		11	G043.16+0.01				-46.46
	+19 10 13.4058	+09 06 13.0708	-56.06 mas	269.15 mas	43.166464	0.011213		12	G043.16+0.01				12.95
	+19 10 13.4069	+09 06 12.8623	-39.29 mas	60.75 mas	43.166414	0.011183		13	G043.16+0.01				12.95
	+19 10 13.4082	+09 06 12.79	-20.06 mas	-11.57 mas	43.166399	0.011169		14	G043.16+0.01				8.31
	+19 10 13.4082	+09 06 12.7902	-20.08 mas	-11.43 mas	43.166399	0.011169		15	G043.16+0.01				7.89
	+19 10 13.4117	+09 06 13.1087	33.24 mas	307.09 mas	43.166484	0.011197		16	G043.16+0.01				4.94
	+19 10 13.4117	+09 06 13.1087	33.25 mas	307.07 mas	43.166484	0.011197		17	G043.16+0.01				4.52
	+19 10 13.4116	+09 06 13.0996	31.03 mas	298.03 mas	43.166482	0.011196		18	G043.16+0.01				1.99
	+19 10 13.4095	+09 06 12.7957	-0.27 mas	-5.87 mas	43.166403	0.011165		19	G043.16+0.01				-11.07
	+19 10 13.4055	+09 06 12.9967	-59.91 mas	195.08 mas	43.166445	0.011205		20	G043.16+0.01				-44.77
	+19 10 13.409	+09 06 12.5004	-7.19 mas	-301.23 mas	43.166329	0.011128		21	G043.16+0.01				-46.04
	+19 10 13.409	+09 06 12.5004	-7.18 mas	-301.21 mas	43.166329	0.011128		22	G043.16+0.01				-46.46
2	+19 20 31.1761	+13 55 25.209			48.606141	0.02304	G48.606+0.024		G048.60+0.02	Image	Descr	22 GHz;	18.84 .. 25.58	160	VLBA	0.42	0.8 x 0.3	-9	+H₂O -CH₃OH I -CH₃OH II +OH	MIXED	10.750		2010 Mar 13 - 2011 Apr 18
	+19 20 31.1762	+13 55 25.2037	2.81 mas	-4.68 mas	48.606140	0.023039		1	G048.60+0.02				25.58
	+19 20 31.1762	+13 55 25.2037	2.81 mas	-4.71 mas	48.606140	0.023039		2	G048.60+0.02				25.16
	+19 20 31.1762	+13 55 25.2036	2.82 mas	-4.79 mas	48.606140	0.023039		3	G048.60+0.02				24.74
	+19 20 31.1762	+13 55 25.2036	2.82 mas	-4.77 mas	48.606140	0.023039		4	G048.60+0.02				24.31
	+19 20 31.1847	+13 55 25.1389	131.04 mas	-69.53 mas	48.606141	0.023000		5	G048.60+0.02				20.52
	+19 20 31.1847	+13 55 25.1389	131.03 mas	-69.54 mas	48.606141	0.023000		6	G048.60+0.02				20.1
	+19 20 31.1847	+13 55 25.1388	131.01 mas	-69.58 mas	48.606141	0.023000		7	G048.60+0.02				19.68
	+19 20 31.1847	+13 55 25.1361	130.04 mas	-72.3 mas	48.606140	0.023000		8	G048.60+0.02				19.26
	+19 20 31.1847	+13 55 25.1361	130.05 mas	-72.3 mas	48.606140	0.023000		9	G048.60+0.02				18.84
	+19 20 31.1762	+13 55 25.2089	2.98 mas	0.48 mas	48.606142	0.023039		10	G048.60+0.02				25.58
	+19 20 31.1762	+13 55 25.2088	2.98 mas	0.45 mas	48.606142	0.023039		11	G048.60+0.02				25.16
	+19 20 31.1762	+13 55 25.2088	3 mas	0.37 mas	48.606142	0.023039		12	G048.60+0.02				24.74
	+19 20 31.1762	+13 55 25.2088	2.99 mas	0.39 mas	48.606142	0.023039		13	G048.60+0.02				24.31
	+19 20 31.1847	+13 55 25.144	131.21 mas	-64.37 mas	48.606142	0.023000		14	G048.60+0.02				20.52
	+19 20 31.1847	+13 55 25.144	131.21 mas	-64.38 mas	48.606142	0.023000		15	G048.60+0.02				20.1
	+19 20 31.1847	+13 55 25.144	131.19 mas	-64.42 mas	48.606142	0.023000		16	G048.60+0.02				19.68
	+19 20 31.1847	+13 55 25.1413	130.21 mas	-67.14 mas	48.606141	0.023000		17	G048.60+0.02				19.26
	+19 20 31.1847	+13 55 25.1413	130.22 mas	-67.14 mas	48.606141	0.023000		18	G048.60+0.02				18.84
	+19 20 31.1762	+13 55 25.2084	2.68 mas	0 mas	48.606141	0.023039		19	G048.60+0.02				25.58
	+19 20 31.1762	+13 55 25.2084	2.68 mas	-0.03 mas	48.606141	0.023039		20	G048.60+0.02				25.16
	+19 20 31.1762	+13 55 25.2083	2.69 mas	-0.11 mas	48.606141	0.023039		21	G048.60+0.02				24.74
	+19 20 31.1762	+13 55 25.2083	2.69 mas	-0.09 mas	48.606141	0.023039		22	G048.60+0.02				24.31
	+19 20 31.1847	+13 55 25.1436	130.91 mas	-64.84 mas	48.606142	0.023000		23	G048.60+0.02				20.52
	+19 20 31.1847	+13 55 25.1435	130.91 mas	-64.86 mas	48.606142	0.023000		24	G048.60+0.02				20.1
	+19 20 31.1847	+13 55 25.1435	130.89 mas	-64.9 mas	48.606142	0.023000		25	G048.60+0.02				19.68
	+19 20 31.1847	+13 55 25.1408	129.91 mas	-67.62 mas	48.606141	0.023000		26	G048.60+0.02				19.26
	+19 20 31.1847	+13 55 25.1408	129.92 mas	-67.62 mas	48.606141	0.023000		27	G048.60+0.02				18.84

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 'ZHA13' 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 'ZHA13' AND detected=true AND hide=false ORDER BY detected DESC,id

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ZHA13 - Parallaxes for W49N and G048.60+0.02: Distant Star Forming Regions in the Perseus Spiral Arm

Interferometry data

View as list of objects

Detection table from Zhang et al. (2013)