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SAK17 - Trigonometric parallax measurement of a water maser source toward the Sgr D H II region

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Short title: Sakai et al. (2017)
Authors: Sakai, DaisukeOyama, TomoakiNagayama, TakumiHonma, MarekiKobayashi, Hideyuki
Journal: Publications of the Astronomical Society of Japan, Volume 69, Issue 4, id.64
Bibcode:

Target type: High_mass_SFR

Abstract
We report on VLBI observations of a water maser source associated with the Sgr D H II region, which is a bright radio continuum source in the direction of the Galactic center region. The absolute proper motions and the distance measured by VLBI Exploration of Radio Astrometry (VERA) were (μα cos δ, μδ) = (-1.32 � 0.15 mas yr-1, -2.86 � 0.34 mas yr-1) and d=2.36_{-0.39}^{+0.58} kpc, respectively. The line-of-sight velocity of the water maser emission is similar to that of the H91α recombination line emission detected at the Sgr D H II region. The spatial position and line-of-sight velocity of the water maser emission indicate that this source is physically associated with the extended H II source seen under radio continuum observations. Thus, our results suggest that the Sgr D H II region is located in the Scutum arm of the Galactic disk. We discuss this new view of the Sgr D complex, based on the parallax and proper motions.

Abstract

We report on VLBI observations of a water maser source associated with the Sgr D H II region, which is a bright radio continuum source in the direction of the Galactic center region. The absolute proper motions and the distance measured by VLBI Exploration of Radio Astrometry (VERA) were (μα cos δ, μδ) = (-1.32 � 0.15 mas yr-1, -2.86 � 0.34 mas yr-1) and d=2.36_{-0.39}^{+0.58} kpc, respectively. The line-of-sight velocity of the water maser emission is similar to that of the H91α recombination line emission detected at the Sgr D H II region. The spatial position and line-of-sight velocity of the water maser emission indicate that this source is physically associated with the extended H II source seen under radio continuum observations. Thus, our results suggest that the Sgr D H II region is located in the Scutum arm of the Galactic disk. We discuss this new view of the Sgr D complex, based on the parallax and proper motions.

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Maser spot	Source name	Image	Descr.	Line	V_peak	μ_X	μ_Y	π	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)							H₂O	(km/s)	(mas/yr)	(mas/yr)	(mas)		Yes/No		(kpc)
1	+17 48 48.545	-28 01 26.29			1.1433099	-0.126667	G1.1433-0.1267			Sgr D	Image	Descr	22 GHz;					VERA	+H₂O	SFR	2.36 (-0.39 +0.58)	2008 - 2011
	+17 48 48.544988	-28 01 26.2899	-0.06 mas	-0.06 mas	1.143310	-0.126667		1	A1	Sgr D				-22.00	0.38 (0.07)	0.37 (0.07)
	+17 48 48.5449847	-28 01 26.28993	-0.11 mas	-0.09 mas	1.143310	-0.126667		2	A2	Sgr D				-21.16	0.40 (0.09)	0.31 (0.06)
	+17 48 48.5450013	-28 01 26.29034	0.14 mas	-0.5 mas	1.143310	-0.126667		3	A3	Sgr D				-20.32	0.14 (0.03)	0.03 (0.15)
	+17 48 48.544988	-28 01 26.29006	-0.06 mas	-0.22 mas	1.143310	-0.126667		4	A4	Sgr D				-19.48	0.12 (0.09)	0.12 (0.09)
	+17 48 48.544992	-28 01 26.28984	0 mas	0 mas	1.143310	-0.126667		5	A5	Sgr D				-19.06	0.00 (0.00)	0.00 (0.00)	0.423 (0.083)
	+17 48 48.544972	-28 01 26.29308	-0.3 mas	-3.24 mas	1.143309	-0.126667		6	A6	Sgr D				-18.64	0.11 (0.06)	1.49 (0.40)
	+17 48 48.5449313	-28 01 26.2929	-0.91 mas	-3.06 mas	1.143309	-0.126667		7	A7	Sgr D				-18.22	0.33 (0.16)	1.27 (0.35)
	+17 48 48.544948	-28 01 26.2939	-0.66 mas	-4.06 mas	1.143309	-0.126667		8	A8	Sgr D				-16.54	-0.13 (0.12)	-1.52 (0.09)
	+17 48 48.5449473	-28 01 26.29409	-0.67 mas	-4.25 mas	1.143309	-0.126667		9	A9	Sgr D				-15.91	-0.31 (0.28)	-0.75 (0.07)
	+17 48 48.548632	-28 01 26.28462	54.6 mas	5.22 mas	1.143318	-0.126678		10	B1	Sgr D				-15.70	1.61 (0.15)	0.24 (0.05)
	+17 48 48.5486433	-28 01 26.28457	54.77 mas	5.27 mas	1.143318	-0.126678		11	B2	Sgr D				-15.28	1.53 (0.02)	0.09 (0.17)
	+17 48 48.548648	-28 01 26.28453	54.84 mas	5.31 mas	1.143318	-0.126678		12	B3	Sgr D				-14.86	1.52 (0.06)	0.04 (0.13)
	+17 48 48.5488413	-28 01 26.29787	57.74 mas	-8.03 mas	1.143315	-0.126680		13	C1	Sgr D				-7.30	0.89 (0.04)	-0.64 (0.20)
	+17 48 48.5488427	-28 01 26.29801	57.76 mas	-8.17 mas	1.143315	-0.126680		14	C2	Sgr D				-6.88	0.99 (0.03)	-0.62 (0.05)
	+17 48 48.5488473	-28 01 26.29801	57.83 mas	-8.17 mas	1.143315	-0.126680		15	C3	Sgr D				-6.04	0.82 (0.07)	-0.78 (0.69)

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 'SAK17' 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 'SAK17' AND detected=true AND hide=false ORDER BY detected DESC,id

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SAK17 - Trigonometric parallax measurement of a water maser source toward the Sgr D H II region

Interferometry data

View as list of objects

Detection table from Sakai et al. (2017)