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NAK93 - Detection of SiO and H2O masers in Galactic bulge sources

Short title: Nakada et al. (1993)
Authors: Nakada, Yoshikazu Onaka, Takashi Yamamura, Issei Deguchi, Shuji Ukita, Nobuharu Izumiura, Hideyuki
Journal: PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 2, p. 179-189.
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Abstract
We present the results of the first survey of Galactic bulge objects by the SiO J = 1-0 and H2O 6₁₆ - 5₂₃ transitions. The sources were selected from the IRAS Point Source Catalog with 12 micron intensity less than 14 Jy and colors, between 0 and 0.2, extracting dust enshrouded objects at a distance of 8 kpc. Twenty three IRAS sources were observed SiO masers were detected in fifteen objects, and H2O in six sources. The overall properties of maser emission for bulge IRAS sources indicate that they are low-mass stars as optical Mira variables. The high detection rate of SiO masers in bulge objects seems to be due to the high sensitivity of the telescope used. The radial velocities of the maser lines reveal the average rotation of the bulge with a rotation velocity of 10 km/s/deg.

Abstract

We present the results of the first survey of Galactic bulge objects by the SiO J = 1-0 and H2O 6₁₆ - 5₂₃ transitions. The sources were selected from the IRAS Point Source Catalog with 12 micron intensity less than 14 Jy and colors, between 0 and 0.2, extracting dust enshrouded objects at a distance of 8 kpc. Twenty three IRAS sources were observed SiO masers were detected in fifteen objects, and H2O in six sources. The overall properties of maser emission for bulge IRAS sources indicate that they are low-mass stars as optical Mira variables. The high detection rate of SiO masers in bulge objects seems to be due to the high sensitivity of the telescope used. The radial velocities of the maser lines reveal the average rotation of the bulge with a rotation velocity of 10 km/s/deg.

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Detection table from Nakada et al. (1993)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	T_a	Telescope	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			SiO	(km/s)	(K)			Yes/No		(kpc)
1	17 06 10.6	-28 05 22.9	355.8632	7.6643	G355.863+7.664	IRAS17030-2801	SiO J=1-0 v=1;	-48.5	0.36	NRO	NRO	+OH +SiO	EVOLVED		NAK93
2	17 06 10.6	-28 05 22.9	355.8632	7.6643	G355.863+7.664	IRAS17030-2801	SiO J=1-0 v=2;	-49	0.53	NRO	NRO	+OH +SiO	EVOLVED		NAK93
3	17 11 59.4	-27 04 8.1	357.4593	7.2208	G357.459+7.221	IRAS17088-2700	SiO J=1-0 v=2;	8.8	0.45	NRO	NRO	-CH₃OH II +OH +SiO	EVOLVED		NAK93
4	17 18 37.4	-25 50 1.6	359.3369	6.7138	G359.337+6.714	IRAS17155-2546	SiO J=1-0 v=1;	-36.1	1.4	NRO	NRO	+H₂O +OH +SiO	EVOLVED		NAK93
5	17 18 37.4	-25 50 1.6	359.3369	6.7138	G359.337+6.714	IRAS17155-2546	SiO J=1-0 v=2;	-38.4	1.48	NRO	NRO	+H₂O +OH +SiO	EVOLVED		NAK93
6	17 22 23.4	-27 20 6.5	358.5691	5.1712	G358.569+5.171	IRAS17192-2717	SiO J=1-0 v=1;	-155.2	0.5	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
7	17 22 23.4	-27 20 6.5	358.5691	5.1712	G358.569+5.171	IRAS17192-2717	SiO J=1-0 v=2;	-155.6	0.41	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
8	17 22 56.9	-21 48 7.8	3.2633	8.1538	G3.263+8.154	IRAS17199-2145	SiO J=1-0 v=1;	-52.6	0.4	NRO	NRO	-OH +SiO	EVOLVED		NAK93
9	17 22 56.9	-21 48 7.8	3.2633	8.1538	G3.263+8.154	IRAS17199-2145	SiO J=1-0 v=2;	-53.6	0.28	NRO	NRO	-OH +SiO	EVOLVED		NAK93
10	17 28 11.1	-26 17 42.4	0.1586	4.6754	G0.159+4.675	IRAS17250-2615	SiO J=1-0 v=1;	-2.8	0.34	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
11	17 28 11.1	-26 17 42.4	0.1586	4.6754	G0.159+4.675	IRAS17250-2615	SiO J=1-0 v=2;	-2.8	0.3	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
12	17 32 16.9	-18 12 50.3	7.5101	8.2616	G7.510+8.262	IRAS17293-1810	SiO J=1-0 v=1;	97	0.31	NRO	NRO	-OH +SiO	EVOLVED		NAK93
13	17 32 16.9	-18 12 50.3	7.5101	8.2616	G7.510+8.262	IRAS17293-1810	SiO J=1-0 v=2;	97.5	0.17	NRO	NRO	-OH +SiO	EVOLVED		NAK93
14	17 37 36.4	-22 19 54.4	4.6689	5.0132	G4.669+5.013	IRAS17345-2218	SiO J=1-0 v=2;	-53.4	0.21	NRO	NRO	+OH +SiO	EVOLVED		NAK93
15	17 42 40.2	-21 24 10.3	6.0820	4.5035	G6.082+4.503	IRAS17396-2122	SiO J=1-0 v=1;	3.8	0.68	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
16	17 42 40.2	-21 24 10.3	6.0820	4.5035	G6.082+4.503	IRAS17396-2122	SiO J=1-0 v=2;	2.8	0.79	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
17	17 45 12.4	-23 08 27.3	4.9015	3.0971	G4.902+3.097	IRAS17421-2307	SiO J=1-0 v=1;	37.3	1.04	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
18	17 45 12.4	-23 08 27.3	4.9015	3.0971	G4.902+3.097	IRAS17421-2307	SiO J=1-0 v=2;	37.3	0.81	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
19	17 50 16.3	-18 40 34.9	9.3484	4.3782	G9.348+4.378	IRAS17473-1839	SiO J=1-0 v=1;	-19	0.33	NRO	NRO	+SiO	EVOLVED		NAK93
20	17 50 16.3	-18 40 34.9	9.3484	4.3782	G9.348+4.378	IRAS17473-1839	SiO J=1-0 v=2;	-18	0.31	NRO	NRO	+SiO	EVOLVED		NAK93
21	18 00 36.5	-29 28 16.3	1.1997	-3.0897	G1.200-3.090	IRAS17574-2928	SiO J=1-0 v=2;	-98.9	0.31	NRO	NRO	+OH +SiO	EVOLVED		NAK93
22	18 10 38.6	-28 05 4.4	3.4847	-4.3379	G3.485-4.338	IRAS18074-2805	SiO J=1-0 v=1;	111.2	0.16	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
23	18 10 38.6	-28 05 4.4	3.4847	-4.3379	G3.485-4.338	IRAS18074-2805	SiO J=1-0 v=2;	109.2	0.46	NRO	NRO	+H₂O -OH +SiO	EVOLVED		NAK93
24	18 18 34.9	-26 01 50.6	6.1385	-4.9253	G6.138-4.925	IRAS18154-2603	SiO J=1-0 v=1;	107.2	0.34	NRO	NRO	-OH +SiO	EVOLVED		NAK93
25	18 18 34.9	-26 01 50.6	6.1385	-4.9253	G6.138-4.925	IRAS18154-2603	SiO J=1-0 v=2;	107.9	0.28	NRO	NRO	-OH +SiO	EVOLVED		NAK93
26	18 31 49	-26 08 56	7.3989	-7.6223	G7.399-7.622	IRAS18287-2611	SiO J=1-0 v=1;	24.3	0.32	NRO	NRO	-OH +SiO	EVOLVED		NAK93
27	18 31 49	-26 08 56	7.3989	-7.6223	G7.399-7.622	IRAS18287-2611	SiO J=1-0 v=2;	24.3	0.37	NRO	NRO	-OH +SiO	EVOLVED		NAK93

Non-detection table from Nakada et al. (1993)