Dynamics of stars in the inner galactic bulge revealed from sio maser surveys

Shuji Deguchi, Takahiro Fujii, Yoshifusa Ita, Hideyuki Izumiura, Osamu Kameya, Atsushi Miyazaki, Yoshikazu Nakada, Makoto Ideta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


We surveyed ∼ 300 MSX/2MASS infrared objects in the 7° × 2° area of the Galactic center in the ∼43 GHz SiO maser lines, obtaining accurate radial velocities of ∼ 160 detected objects. The longitude–velocity diagram of these objects reveals two conspicuous features: one indicating a linear velocity increase with longitude with |l| < 1.5°, which is likely to be associated with the inner bar, and the other having eccentric velocities with |Vlsr | > 250 km s−1. Based on numerical simulations of stellar orbits in the Galactic bulge, we conclude that the latter feature is created as a result of a past star formation in the bulge, when the intersecting point of the x1 and x2 orbits was considerably outside of the present position.

Original languageEnglish
Title of host publicationAstrophysics and Space Science Proceedings
EditorsKeiichi Wada, Francoise Combes
PublisherSpringer Science and Business Media B.V.
Number of pages6
ISBN (Electronic)9780387727684
ISBN (Print)9780387727677, 9780387727677, 9780387876207, 9781402055720, 9781402069321, 9781402088674, 9781402091896, 9781441981608, 9781441983688, 9783540758259, 9783642033230, 9783642103216, 9783642103513, 9783642113406, 9783642172502, 9789048133994, 9789048134984
Publication statusPublished - 2008
Externally publishedYes
EventSymposium on Mapping the Galaxy and Nearby Galaxies, 2006 - Ishigaki island, Japan
Duration: 2006 Jun 262006 Jun 30

Publication series

NameAstrophysics and Space Science Proceedings
ISSN (Print)1570-6591
ISSN (Electronic)1570-6605


OtherSymposium on Mapping the Galaxy and Nearby Galaxies, 2006
CityIshigaki island

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Computer Science Applications
  • Spectroscopy
  • Space and Planetary Science
  • Nuclear and High Energy Physics


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