An SiO Maser Search off the Galactic Plane

Abstract

We have searched for the SiO J=1--0 v= 1 and 2 maser lines at ~ 43 GHz in 277 2MASS/MSX/IRAS sources off the Galactic plane (|b|> 3 deg), which resulted in 119 (112 new) detections. Among the new detections, are two very faint objects with MSX 12 micron flux densities below 2 Jy. These are likely to be O-rich AGB-stars associated with dwarf-galaxy tidal tails. The sample also includes medium bright MSX objects at moderately high Galactic latitudes (3 deg<|b|<5 deg) and in the IRAS gap at higher latitudes. A signature of a warp of the inner Galactic disk is found for a disk subsample. This warp appears relatively strongly in the area of 0<l<45 deg and 3<|b|<5 deg. We also found a group of stars that does not follow to the Galactic rotation. This feature appears in the Galactic disk at l~ 27 deg, and extends more than 15 deg in Galactic latitude, like a stream of tidal debris from a dwarf galaxy.

PASJ No.3 (June 25, 2007 issue in press)

References in corpus (3)

• Outer structure of the Galactic warp and flare: explaining the Canis Major over-density
• Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center
• SiO Maser Survey of the Inner Bar of the Galactic Bulge

Cited by in corpus (7)

• Infrared two-colour diagrams for AGB stars using AKARI, MSX, IRAS and NIR data
• Mira Variable Stars From LAMOST DR4 Data: Emission Features, Temperature Types, and Candidate Selection
• SiO Maser Survey off the Galactic Plane: A Signature of Streaming Motion
• Kinematics of Red Variables in the Solar Neighborhood I. Basic Data Obtained by an SiO Maser Survey
• Ground Vibrational State SiO Emission in the VLA BAaDE Survey
• STEREO observations of long period variables
• SiO Maser Survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius Stellar Stream