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

doi:10.1007/978-0-387-72768-4_5

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 proceeding › Conference contribution

1 Citation (Scopus)

Abstract

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 |V_lsr | > 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 language	English
Title of host publication	Astrophysics and Space Science Proceedings
Editors	Keiichi Wada, Francoise Combes
Publisher	Springer Science and Business Media B.V.
Pages	33-38
Number of pages	6
ISBN (Electronic)	9780387727684
ISBN (Print)	9780387727677, 9780387727677, 9780387876207, 9781402055720, 9781402069321, 9781402088674, 9781402091896, 9781441981608, 9781441983688, 9783540758259, 9783642033230, 9783642103216, 9783642103513, 9783642113406, 9783642172502, 9789048133994, 9789048134984
DOIs	https://doi.org/10.1007/978-0-387-72768-4_5
Publication status	Published - 2008
Externally published	Yes
Event	Symposium on Mapping the Galaxy and Nearby Galaxies, 2006 - Ishigaki island, Japan Duration: 2006 Jun 26 → 2006 Jun 30

Publication series

Name	Astrophysics and Space Science Proceedings
Volume	0
ISSN (Print)	1570-6591
ISSN (Electronic)	1570-6605

Other

Other	Symposium on Mapping the Galaxy and Nearby Galaxies, 2006
Country/Territory	Japan
City	Ishigaki island
Period	06/6/26 → 06/6/30

ASJC Scopus subject areas

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

Access to Document

10.1007/978-0-387-72768-4_5

Cite this

Deguchi, S., Fujii, T., Ita, Y., Izumiura, H., Kameya, O., Miyazaki, A., Nakada, Y., & Ideta, M. (2008). Dynamics of stars in the inner galactic bulge revealed from sio maser surveys. In K. Wada, & F. Combes (Eds.), Astrophysics and Space Science Proceedings (pp. 33-38). (Astrophysics and Space Science Proceedings; Vol. 0). Springer Science and Business Media B.V.. https://doi.org/10.1007/978-0-387-72768-4_5

Dynamics of stars in the inner galactic bulge revealed from sio maser surveys. / Deguchi, Shuji; Fujii, Takahiro; Ita, Yoshifusa et al.

Astrophysics and Space Science Proceedings. ed. / Keiichi Wada; Francoise Combes. Springer Science and Business Media B.V., 2008. p. 33-38 (Astrophysics and Space Science Proceedings; Vol. 0).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Deguchi, S, Fujii, T, Ita, Y, Izumiura, H, Kameya, O, Miyazaki, A, Nakada, Y & Ideta, M 2008, Dynamics of stars in the inner galactic bulge revealed from sio maser surveys. in K Wada & F Combes (eds), Astrophysics and Space Science Proceedings. Astrophysics and Space Science Proceedings, vol. 0, Springer Science and Business Media B.V., pp. 33-38, Symposium on Mapping the Galaxy and Nearby Galaxies, 2006, Ishigaki island, Japan, 06/6/26. https://doi.org/10.1007/978-0-387-72768-4_5

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title = "Dynamics of stars in the inner galactic bulge revealed from sio maser surveys",

abstract = "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.",

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

note = "Publisher Copyright: {\textcopyright} 2008, Springer Netherlands. All rights reserved.; Symposium on Mapping the Galaxy and Nearby Galaxies, 2006 ; Conference date: 26-06-2006 Through 30-06-2006",

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AU - Deguchi, Shuji

AU - Fujii, Takahiro

AU - Ita, Yoshifusa

AU - Izumiura, Hideyuki

AU - Kameya, Osamu

AU - Miyazaki, Atsushi

AU - Nakada, Yoshikazu

AU - Ideta, Makoto

PY - 2008

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N2 - 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.

AB - 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.

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

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