A Distinct Structure Inside the Galactic Bar

Details A Distinct Structure Inside the Galactic Bar A Distinct Structure Inside the Galactic Bar

2005-02-03

arxiv.org/abs/astro-ph/0502058v2

Astrophys.J. 621 (2005) L105-L108

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures. accepted by ApJL

Scientific paper

10.1086/429291

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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