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SJO02 - H2O and SiO maser emission in Galactic center OH/IR stars $O and SiO maser emission in Galactic center OH/IR stars

Short title: Sjouwerman et al. (2002)
Authors: Sjouwerman, L. O. Lindqvist, M. van Langevelde, H. J. Diamond, P. J.
Journal: Astronomy and Astrophysics, v.391, p.967-978 (2002)
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (35 detection)
Target type: star

Abstract
We have performed targeted surveys for 22 GHz H₂O and 43 GHz SiO maser emission in Galactic center OH/IR stars using the Very Large Array. Some of the detections have been used in a previous paper to investigate the possibility of measuring milli-arcsecond accurate positions (to obtain stellar proper motions) in the Galactic center. Here we report on the detection of at least 25 H₂O masers and 18 SiO masers associated with stars within 2 degr and 15 arcmin of Sgr A*, respectively. This survey has more than doubled the total number of proper motion candidates to at least about 50 stellar objects. The stellar SiO masers are best suited for proper motion studies, although the initial OH, H₂O or SiO maser positions may not be well enough determined to use for a-priori VLBI positions. Serendipitously we also found 8 H₂O masers in the molecular cloud M-0.13-0.08. Figures 1 to 4 are only available in electronic form at http://www.edpsciences.org. Tables \ref{tab2}-\ref{tab4} are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/391/967	Comments: Sources associated with star-forming regions (SFR) were omitted Peak flux densities Speak were assigned to velocities (vblue or vred) using the spectra. Coordinates for sources from Table 5 taken from OH-Maser-Database.

Abstract

We have performed targeted surveys for 22 GHz H₂O and 43 GHz SiO maser emission in Galactic center OH/IR stars using the Very Large Array. Some of the detections have been used in a previous paper to investigate the possibility of measuring milli-arcsecond accurate positions (to obtain stellar proper motions) in the Galactic center. Here we report on the detection of at least 25 H₂O masers and 18 SiO masers associated with stars within 2 degr and 15 arcmin of Sgr A*, respectively. This survey has more than doubled the total number of proper motion candidates to at least about 50 stellar objects. The stellar SiO masers are best suited for proper motion studies, although the initial OH, H₂O or SiO maser positions may not be well enough determined to use for a-priori VLBI positions. Serendipitously we also found 8 H₂O masers in the molecular cloud M-0.13-0.08. Figures 1 to 4 are only available in electronic form at Tables \ref{tab2}-\ref{tab4} are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via

Comments:
Sources associated with star-forming regions (SFR) were omitted
Peak flux densities Speak were assigned to velocities (vblue or vred) using the spectra.
Coordinates for sources from Table 5 taken from OH-Maser-Database.

Input tables: J/A+A/391/967/table2.dat and Table 5
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Detection table from Sjouwerman et al. (2002)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	F_peak	∫F dv	Telescope	RMS	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(deg.)	(deg.)			H₂O	(km/s)	(Jy)	(Jy*km/s)		(Jy)	Yes/No		(kpc)
1	17 43 45.6	-29 15 34.9	359.5119	0.1772	G359.5119+0.1772	OH359.508+0.179	22 GHz;	-134.5	0.25	31.2	NRAOVLA	0.015	+H₂O	EVOLVED
2	17 43 46.8	-29 15 37.8	359.5134	0.1732	G359.5134+0.1732	OH359.513+0.174	22 GHz;	114.2	0.23	51.9	NRAOVLA	0.015	+H₂O +OH	EVOLVED
3	17 44 4.1	-29 19 54.9	359.4855	0.0822	G359.4869+0.0808	OH359.487+0.081	22 GHz;	-74.2	0.3	32.6	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
4	17 44 7.4	-29 24 7.6	359.4320	0.0353	G359.4294+0.0356	OH359.429+0.035	22 GHz;	-0.6	0.5	40.8	NRAOVLA	0.015	+H₂O +OH	SFR_MIXED
5	17 44 27.7	-29 20 48.6	359.5176	0.0015	G359.5176+0.0015	OH359.517+0.001	22 GHz;	-146.9	0.22	24.5	NRAOVLA	0.015	+H₂O +OH	SFR_MIXED
6	17 44 28	-28 50 49.1	359.9444	0.2618	G359.944+0.261	OH359.943+0.260	22 GHz;	-202.4	0.1	24.5	NRAOVLA	0.015	+H₂O +OH	EVOLVED
7	17 44 44.5	-29 05 40.2	359.7648	0.0811	G359.7651+0.0817	OH359.765+0.082	22 GHz;	93.1	0.17	92.7	NRAOVLA	0.015	+H₂O +OH +SiO	EVOLVED
8	17 44 45.8	-29 00 42.6	359.8378	0.1202	G359.8374+0.1202	OH359.837+0.120	22 GHz;	-341.8	0.09	21.5	NRAOVLA	0.015	+H₂O +OH	SFR_MIXED
9	17 44 46	-29 06 13.9	359.7596	0.0717	G359.7596+0.0717	OH359.760+0.072	22 GHz;	-73.3	0.14	41.5	NRAOVLA	0.015	+H₂O	SFR_MIXED
10	17 45 13.9	-28 47 42.1	0.0761	0.1462	G0.0760+0.1461	OH000.076+0.146	22 GHz;	5.8	0.09	34.9	NRAOVLA	0.015	+H₂O +OH -SiO	SFR_MIXED
11	17 45 17.6	-28 48 36.5	0.0703	0.1266	G0.0703+0.1268	OH000.071+0.127	22 GHz;	-52.8	0.2	20	NRAOVLA	0.015	+H₂O +OH	SFR_MIXED
12	17 45 19	-28 58 56.9	359.9258	0.0326	G359.9256+0.0326	OH359.924+0.034	22 GHz;	-92.5	0.17	28.9	NRAOVLA	0.015	+H₂O +OH -SiO	SFR_MIXED
13	17 45 33.5	-29 02 16.2	359.9062	-0.0416	G359.9061-0.0411	OH359.906-0.041	22 GHz;	-156.0	0.63	107.5	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
14	17 45 34.7	-29 06 2.7	359.8548	-0.0781	G359.8548-0.0780	OH359.855-0.078	22 GHz;	21.8	0.16	112	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
15	17 45 38.4	-29 03 35.8	359.8966	-0.0682	G359.8928-0.0671	OH359.897-0.065	22 GHz;	-132.1	0.08	8.2	NRAOVLA	0.015	+H₂O +CH₃OH I +CH₃OH II	SFR_MIXED
16	17 45 40.7	-29 00 23.5	359.9465	-0.0475	G359.9444-0.0464	OH359.946-0.047	22 GHz;	-44.3	0.46	51.2	NRAOVLA	0.015	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED
17	17 45 42.7	-28 59 56.8	359.9568	-0.0501	G359.9568-0.0500	OH359.956-0.050	22 GHz;	44.8	0.35	79.4	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
18	17 45 44.4	-28 59 13	359.9703	-0.0487	G359.9703-0.0482	OH359.970-0.049	22 GHz;	92.2	0.07	17.1	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
19	17 45 49.2	-28 53 29.4	0.0610	-0.0142	G0.0600-0.0178	OH000.060-0.018	22 GHz;	15.7	0.06	6.7	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
20	17 45 52.3	-28 48 14.1	0.1415	0.0220	G0.1415+0.0220	OH000.142+0.026	22 GHz;	25.2	0.12	17.8	NRAOVLA	0.015	+H₂O	SFR_MIXED
21	17 45 52.7	-29 14 33.3	359.7678	-0.2077	G359.768-0.208	OH359.768-0.207	22 GHz;	-169.1	0.08	15.6	NRAOVLA	0.015	+H₂O +OH	SFR_MIXED
22	17 45 54.1	-28 31 45.2	0.3795	0.1593	G0.3795+0.1593	OH000.379+0.159	22 GHz;	139.3	0.12	13.4	NRAOVLA	0.015	+H₂O +OH	EVOLVED
23	17 45 55.3	-28 45 27.2	0.1869	0.0366	G0.1899+0.0366	OH000.190+0.036	22 GHz;	143.4	0.11	10.4	NRAOVLA	0.015	+H₂O -SiO	SFR_MIXED
24	17 45 56.1	-28 55 51.7	0.0403	-0.0562	G0.0401-0.0560	OH000.040-0.056	22 GHz;	56.9	0.24	42.3	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
25	17 45 57.6	-29 19 9.8	359.7114	-0.2628	G359.711-0.263	OH359.712-0.263	22 GHz;	-17.0	0.35	59.3	NRAOVLA	0.015	+H₂O +OH	SFR
26	17 46 01	-29 01 23	359.9710	-0.1193	G359.9708-0.1189	OH359.971-0.119	22 GHz;	-23.0	0.09	19.3	NRAOVLA	0.015	+H₂O +OH -SiO	SFR_MIXED
27	17 46 1.4	-28 50 6.6	0.1322	-0.0228	G0.1340-0.0226	OH000.134-0.023	22 GHz;	-40.2	0.18	32.6	NRAOVLA	0.015	+H₂O +OH -SiO	SFR_MIXED
28	17 46 15	-28 36 46.9	0.3477	0.0504	G0.3477+0.0504	OH000.349+0.053	22 GHz;	39.7	0.29	26	NRAOVLA	0.015	+H₂O	SFR_MIXED
29	17 46 15.8	-28 48 35.6	0.1812	-0.0546	G0.1812-0.0546	OH000.178-0.055	22 GHz;	-23.7	0.11	25.2	NRAOVLA	0.015	+H₂O	SFR_MIXED
30	17 46 35.6	-29 21 49.7	359.7454	-0.4040	G359.745-0.404	OH359.745-0.404	22 GHz;	173.3	0.18	31.2	NRAOVLA	0.015	+H₂O +OH	SFR_MIXED
31	17 46 35.7	-28 58 58.4	0.0711	-0.2065	G0.071-0.205	OH000.071-0.205	22 GHz;	110.1	0.1	5.2	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
32	17 46 38.3	-29 19 24.7	359.7849	-0.3915	G359.784-0.392	OH359.783-0.392	22 GHz;	209.0	0.1	6.7	NRAOVLA	0.015	+H₂O +OH	EVOLVED
33	17 47 4.9	-28 29 39.8	0.5440	-0.0442	G0.5440-0.0442	OH000.543-0.043	22 GHz;	-16.6	1.2	297.4	NRAOVLA	0.015	+H₂O +OH	SFR
34	17 47 9.1	-28 29 51.7	0.5491	-0.0590	G0.5488-0.0566	OH000.548-0.059	22 GHz;	-16.5	0.4	34.9	NRAOVLA	0.015	+H₂O +OH +SiO	SFR_MIXED
35	17 47 25.6	-28 29 20.7	0.5879	-0.1064	G0.5879-0.1064	OH000.589-0.108	22 GHz;	-189.5	0.32	48.2	NRAOVLA	0.015	+H₂O +OH	SFR_MIXED

Distribution of sources in all sky (l,b)

Distribution of sources in all sky using Aladin

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Distribution of sources in IRAS color-color diagram

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Original color diagram is taken form van der Veen & Habing (1987)

Type	Description
I	Oxygen-rich non-variable stars without circumstellar shells
II	Variable stars with "young" O-rich circumstellar shells
IIIa	Variable stars with more evolved O-rich circumstellar shells
IIIb	Variable stars with thick O-rich circumstellar shells
IV	Variable stars with very thick O-rich circumstellar shells
V	Planetary nebulae and non- variable stars with very cool circumstellar shells
VIa	Variable stars with relatively cold dust at large distances; a significant part of the stars is carbon-rich
VIb	Variable stars with relatively hot dust close to the star and relatively cold dust at large distances; Some of the objects have proven to be O-rich
VII	Variable stars with more evolved C-rich circumstellar shells
VIII	Different sort of objects

Distribution of the detection velocities versus galactic longitude from SJO02

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