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A Distinct Structure inside the Galactic Bar

The Astrophysical Journal2005Vol. 621(2), pp. L105–L108

Citations Over TimeTop 10% of 2005 papers

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

Abstract

We present the result of a near-infrared (J H Ks) survey along the Galactic plane, -10.5deg < l < +10.5deg and b=+1.0deg, with the IRSF 1.4m telescope and the SIRIUS camera. Ks vs. H-Ks color-magnitude diagrams reveal a well-defined population of red clump (RC) stars whose apparent magnitude peak changes continuously along the Galactic plane, from Ks=13.4 at l=-10deg to Ks=12.2 at l=+10deg after dereddening. This variation can be explained by the bar-like structure found in previous studies, but we find an additional inner structure at |l| < 4deg, where the longitude - apparent magnitude relation is distinct from the outer bar, and the apparent magnitude peak changes by only 0.1 mag over the central 8deg. The exact nature of this inner structure is as yet uncertain.

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