J/PASJ/62/525 SiO maser survey off the Galactic Plane (Deguchi+, 2010)
SiO maser survey off the Galactic Plane: A signature of streaming motion.
Deguchi S., Shimoikura T., Koike K.
<Publ. Astron. Soc. Jap., 62, 525-546 (2010)>
=2010PASJ...62..525D 2010PASJ...62..525D
ADC_Keywords: Galactic plane ; Stars, giant ; Masers ; Radial velocities
Keywords: Galaxy: disk - Galaxy: kinematics and dynamics -
stars: AGB and post-AGB
Abstract:
A group of Mira variables in the solar neighborhood shows unusual
spatial motion in the Galaxy. To study this motion on a much larger
scale in the Galaxy, we newly surveyed 134 evolved stars off the
Galactic plane by SiO maser lines, obtaining accurate radial
velocities of 84 detected stars. Together with the past data of SiO
maser sources, we analyzed the radial-velocity data of a large sample
of sources distributed in a distance range of about 0.3-6kpc in the
first Galactic quadrant. At Galactic longitudes between 20° and
40°, we found a group of stars with large negative radial
velocities, which deviate by more than 100km/s from the Galactic
rotation. We show that these deviant motions of maser stars are
created by periodic gravitational perturbation of the Bulge bar, and
that the effect appears most strongly at radii between corotation and
outer Lindblad resonances. The resonance effect can explain the
displacement of positions from the Galactic plane as well.
Description:
The observations were made with the 45-m radio telescope
at Nobeyama in 2009 April and May by the SiO J=1-0 v=1 and 2
transitions at 43.122 and 42.821GHz, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 78 85 Observational results of SiO masers
table2.dat 40 48 Negative results for SiO detection
table3.dat 82 133 Infrared properties of the observed stars
table4.dat 77 20 Candidates for deviant motion (|b|>3°)
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJS/106/463 : SiO maser sources (Jiang+ 1996)
J/A+AS/127/185 : SiO masers in OH/IR stars, proto-PN and PN (Nyman+ 1998)
J/A+AS/132/211 : Interstellar SiO sources (Harju+ 1998)
J/A+A/391/967 : H2O and SiO masers in the Galactic center (Sjouwerman+, 2002)
J/A+A/393/115 : 86GHz SiO maser survey of late-type stars (Messineo+, 2002)
J/A+A/418/103 : 86GHz SiO maser survey in the Inner Galaxy (Messineo+, 2004)
J/A+A/435/575 : 86GHz SiO maser survey of late-type stars (Messineo+, 2005)
J/ApJ/669/446 : Observations of SiO masers (Nakashima+, 2007)
J/PASJ/53/293 : IRAS/SiO sources toward Galactic Bulge (Deguchi+, 2001)
J/PASJ/54/719 : IRAS/SiO sources in the Galactic bulge (Deguchi+, 2002)
J/PASJ/55/203 : SiO maser survey toward inner Galactic disk (Nakashima+, 2003)
J/PASJ/55/229 : SiO maser survey of cold IRAS sources (Nakashima+, 2003)
J/PASJ/56/261 : SiO maser survey in Galactic center (Deguchi+, 2004)
J/PASJ/56/765 : SiO maser survey of IRAS sources (Degychi+, 2004)
J/PASJ/58/529 : SiO Maser Survey in Galactic Bulge (Fujii+, 2006)
J/PASJ/59/559 : SiO maser search off the Galactic plane (Deguchi+, 2007)
J/PASJ/62/391 : SiO and H2O maser in Galactic disk clusters (Deguchi+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
19- 23 F5.3 K Ta1 ?=- Antenna temperature at the intensity
peak for SiO J=1-0 v=1 line
25- 29 F5.1 km/s VLSR1 ?=- LSR radial velocity for SiO J=1-0 v=1
line (43.122GHz)
31- 36 F6.3 K.km/s LF1 ?=- Integrated line intensity for SiO J=1-0
v=1 line (43.122GHz)
38- 42 F5.3 K rms1 Root mean square of the noise level for
SiO J=1-0 v=1 line
44- 48 F5.3 K Ta2 ?=- Antenna temperature at the intensity peak
for SiO J=1-0 v=2 line (42.821GHz)
50- 54 F5.1 km/s VLSR2 ?=- LSR radial velocity for SiO J=1-0 v=2
line (42.821GHz)
56- 61 F6.3 K.km/s LF2 ?=- Integrated line intensity for
SiO J=1-0 v=2 line
63- 67 F5.3 K rms2 Root mean square of the noise level for
SiO J=1-0 v=2 line
69- 78 A10 "YYYY/MM/DD" ObsDate Observation date
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
19- 23 F5.3 K rms1 Root mean square of the noise level for
SiO J=1-0 v=1 line
25- 29 F5.3 K rms2 Root mean square of the noise level for
SiO J=1-0 v=2 line
31- 40 A10 "YYYY/MM/DD" ObsDate Observation date
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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- 17 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
19- 25 F7.3 deg GLON Galactic longitude
27- 33 F7.3 deg GLAT Galactic latitude
35- 39 F5.3 mag Kmag 2MASS apparent K magnitude (1)
41- 45 F5.3 mag H-K 2MASS H-K colour index
47- 51 F5.3 mag Kmagc Corrected K magnitude
53- 62 A10 --- IRAS IRAS name (HHMMm+DDMM)
65- 69 F5.2 Jy F12 IRAS flux density at 12um
71- 76 F6.3 --- C12 IRAS C12 (log(F25um/F12um)) colour index
78- 82 F5.1 km/s v(SiO) ? Average LSR velocity of SiO maser lines
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Note (1): 2MASS photometric uncertainties are about 0.2mag for bright stars
with K<4 (see
http://www.ipac.caltech.edu/2mass:releases/allsky/doc/sec2_2.html)
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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- 17 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
18 A1 --- n_2MASS [*+] Note on 2MASS (1)
20- 29 A10 --- IRAS IRAS name (HHMMm+DDMM)
31- 35 F5.2 deg GLON Galactic longitude
37- 42 F6.2 deg GLAT Galactic latitude
44- 48 F5.1 km/s vLSR LSR radial velocity
50- 54 F5.2 mag Kmag 2MASS apparent K magnitude
56- 59 F4.2 mag H-K 2MASS H-K colour index
61- 65 F5.2 mag Kmagc Corrected K magnitude
67- 71 F5.1 Jy F12um IRAS flux density at 12um
73- 77 F5.2 --- C12 IRAS C12 (log(F25um/F12um)) colour index
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Note (1): Note as follows:
* = Hipparcos proper motion data exist
+ = Detection in this work
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Jun-2010