A Distinct Structure inside the Galactic Bar | Zendy

Shogo Nishiyama | Zendy; Tetsuya Nagata | Zendy; Daisuke Baba | Zendy; Y. Haba | Zendy; Ryota Kadowaki | Zendy; Daisuke Kato | Zendy; Mikio Kurita | Zendy; Chie Nagashima | Zendy; Takahiro Nagayama | Zendy; Yuka Murai | Zendy; Yasushi Nakajima | Zendy; Motohide Tamura | Zendy; Hidehiko Nakaya | Zendy; Koji Sugitani | Zendy; Takahiro Naoi | Zendy; Noriyuki Matsunaga | Zendy; Toshihiko Tanabé | Zendy; Nobuhiko Kusakabe | Zendy; Shuji Sato | Zendy

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A Distinct Structure inside the Galactic Bar

Author(s) -

Shogo Nishiyama,

Tetsuya Nagata,

Daisuke Baba,

Y. Haba,

Ryota Kadowaki,

Daisuke Kato,

Mikio Kurita,

Chie Nagashima,

Takahiro Nagayama,

Yuka Murai,

Yasushi Nakajima,

Motohide Tamura,

Hidehiko Nakaya,

Koji Sugitani,

Takahiro Naoi,

Noriyuki Matsunaga,

Toshihiko Tanabé,

Nobuhiko Kusakabe,

Shuji Sato

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/429291

Subject(s) - magnitude (astronomy) , physics , astrophysics , sirius , galactic plane , stars , absolute magnitude , bar (unit) , longitude , population , astronomy , latitude , demography , sociology , meteorology

We present the result of a near-infrared (J H Ks) survey along the Galacticplane, -10.5deg < l < +10.5deg and b=+1.0deg, with the IRSF 1.4m telescope andthe SIRIUS camera. Ks vs. H-Ks color-magnitude diagrams reveal a well-definedpopulation of red clump (RC) stars whose apparent magnitude peak changescontinuously along the Galactic plane, from Ks=13.4 at l=-10deg to Ks=12.2 atl=+10deg after dereddening. This variation can be explained by the bar-likestructure found in previous studies, but we find an additional inner structureat |l| < 4deg, where the longitude - apparent magnitude relation is distinctfrom the outer bar, and the apparent magnitude peak changes by only 0.1 magover the central 8deg. The exact nature of this inner structure is as yetuncertain.Comment: 8 pages, 4 figures. accepted by ApJ

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