The so-called "bar" in the Large Magellanic Cloud

Citation
Hs. Zhao et Nw. Evans, The so-called "bar" in the Large Magellanic Cloud, ASTROPHYS J, 545(1), 2000, pp. L35-L38
Citations number
19
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004637X → ACNP
Volume
545
Issue
1
Year of publication
2000
Part
2
Pages
L35 - L38
Database
ISI
SICI code
0004-637X(200012)545:1<L35:TS"ITL>2.0.ZU;2-L
Abstract
We propose that the off-centered "bar" in the Large Magellanic Cloud (LMC) is an unvirialized structure slightly misaligned with, and offset from, the plane of the LMC disk. The small displacement and misalignment are consequ ences of recent tidal interactions with the Small Magellanic Cloud and the Galaxy. This proposal, although radical, is consistent with the kinematics of the LMC and the near-infrared star count maps from the Deep Near-Infrare d Survey and the 2 Micron All-Sky Survey and, in particular, with the repor ted 25 degrees -50 degrees inclination range of the LMC and the east-west g radient of distance moduli of standard candles. Contributions to LMC microl ensing come mainly from the mutual lensing of stars in the disk and the "ba r." The predicted microlensing optical depth is at levels comparable to obs ervation, even without including contributions from MACHOs. Observational t ests are suggested to discriminate between our misaligned offset "bar" mode l and the conventional picture of an off-centered planar bar.