J/A+A/391/967 H2O and SiO masers in the Galactic center (Sjouwerman+, 2002)
H2O and SiO maser emission in Galactic center OH/IR stars.
Sjouwerman L.O., Lindqvist M., van Langevelde H.J., Diamond P.J.
<Astron. Astrophys. 391, 967 (2002)>
=2002A&A...391..967S 2002A&A...391..967S
ADC_Keywords: Stars, masers ; Infrared sources ; Spectroscopy ; Radio lines
Keywords: masers - surveys - astrometry - stars: AGB and post-AGB -
Galaxy: center
Abstract:
We have performed targeted surveys for 22GHz H2O and 43GHz 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° and 15' of Sgr A*,
respectively. This survey has more than doubled the total number of
proper motion candidates to at least about 50 stellar objects.
Description:
Table 2 contains 22GHz H2O maser detections toward targeted 1612MHz OH
masers (OH/IR stars) within 2 degrees of the Galactic center (Sgr A*).
Table 3 presents serendipitous H2O maser detections in M-0.13-0.08
found during the 22GHz survey.
Table 4 lists 43GHz SiO maser detections toward targeted 1612MHz OH
masers (OH/IR stars) within 15arcminutes of the Galactic center (Sgr A*).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 106 39 H2O maser detections in targeted 1612MHz OH masers
in the Galactic center
table3.dat 90 10 Serendipitous H2O maser detections in M-0.13-0.08
table4.dat 99 18 SiO maser detections in OH/IR stars in the
Galactic center
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See also:
J/A+A/368/845 : Arcetri Catalog of H2O maser sources. (Valdettaro+, 2001)
J/A+AS/101/153 : Galactic H2O masers (Palagi+ 1993)
J/A+AS/137/43 : OH/H2O masers database (Forster+, 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name OH Name
14 A1 --- f_Name [#*] see Note (1)
17- 18 A2 --- Set Data Set ID
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 32 F6.3 s RAs Right ascension (J2000)
35 A1 --- DE- Declination sign
36- 37 I2 deg DEd Declination (J2000)
39- 40 I2 arcmin DEm Declination (J2000)
42- 46 F5.2 arcsec DEs Declination (J2000)
49- 53 F5.2 arcsec Delta Difference with OH position
56- 61 F6.1 km/s VblueOH ? Blueshifted OH maser component velocity
64- 69 F6.1 km/s VredOH Redshifted OH maser component velocity
72- 77 F6.1 km/s VblueH2O ? Blueshifted H2O maser component velocity
80- 85 F6.1 km/s VsysH2O ? Systemic/central H2O maser component velocity
89- 94 F6.1 km/s VredH2O ? Redshifted H2O maser component velocity
97-100 F4.2 Jy Speak Peak flux density red-shifted H2O peak at 22GHz
103-106 F4.2 Jy.km/s Itot Integrated line flux red-shifted H2O peak
at 22GHz
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Note (1): Note:
*: tentative association; see discussion in Sect. 3 and 4
#: SFR, not stellar (OH/IR); see discussion in Sect. 4.1
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name H2O Name
16- 17 A2 --- Set Data Set ID
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 31 F6.3 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 45 F5.2 arcsec DEs Declination (J2000)
48- 52 F5.3 arcsec e_DEs Formal error in position
56- 60 F5.1 km/s VblueH2O ? Blueshifted H2O maser component velocity
63- 67 F5.1 km/s VcentH2O ? Systemic/central H2O maser component
velocity
71- 74 F4.1 km/s VredH2O ? Redshifted H2O maser component velocity
78- 81 F4.2 Jy Speak Peak flux density red-shifted H2O peak
at 22GHz
84- 87 F4.2 Jy.km/s Itotal Integrated line flux red-shifted H2O peak
at 22GHz
90 A1 --- --- ? See Note (1)
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Note (1): Note:
*: Star?, See Sect. 4.1
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name H2O Name
16- 17 A2 --- Set Data Set ID
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 31 F6.3 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 45 F5.2 arcsec DEs Declination (J2000)
48- 51 F4.2 arcsec Delta Difference with OH position
57- 61 F5.1 km/s Vsys42 ? Systemic 42.820GHz SiO maser velocity
64- 67 F4.2 Jy Sp42GHz ? Peak flux density 42.820GHz SiO maser
70- 73 F4.2 Jy.km/s Itot ? Integrated line flux 42.820GHz SiO maser
79- 83 F5.1 km/s Vsys43 ? Systemic 43.122GHz SiO maser velocity
86- 89 F4.2 Jy Sp43GHz ? Peak flux density 43.122GHz SiO maser
92- 95 F4.2 Jy.km/s Itot43GHz ? Integrated line flux 43.122GHz SiO maser
99 A1 --- Note See Note (1)
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Note (1): Note:
*: measurement of May 1994 (Fig. 1), not detected in either 43GHz SiO
line in Jan 1995 (Fig. 4)
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Acknowledgements: Lorant Sjouwerman
(End) Patricia Bauer [CDS] 08-Jul-2002