期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 358, 期 4, 页码 1309-1319出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2005.08828.x
关键词
dust, extinction; Galaxy : bulge; Galaxy : stellar content; Galaxy : structure; infrared : stars
We present a deep near-infrared wide-angle photometric analysis of the structure of the inner Galactic bar and central disc. The presence of a triaxial structure at the centre of the Galaxy is confirmed, consistent with a bar inclined at 22 degrees +/- 5.degrees 5 from the Sun - Galactic Centre line, extending to approximately 2.5 kpc from the Galactic Centre and with a rather small axis ratio. A feature at l = - 9.degrees 8 not aligned with this triaxiality suggests the existence of a second structure in the inner Galaxy, a double triaxiality or an inner ring. We argue that this is likely to be the signature of the end of the Galactic bar, at approximately 2.5 - 3 kpc, which is circumscribed by an inner pseudo-ring. No thick dust lane preceding the bar is detected and a hole in the dust distribution of the disc inside the bar radius is inferred.
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