Abstract/Details

2MASS view of the LMC: Structure, populations, kinematics


2001 2001

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Abstract (summary)

The results of a study of the Large Magellanic Cloud based on near-infrared 2MASS photometry are presented. From near-infrared color-magnitude diagram, stellar populations of the LMC are identified and characterized, and their spatial distributions are studied. The luminosity functions are presented for LMC bar and disk fields. Isochrone analysis is performed and estimates of age and metallicity of bar and disk populations are obtained. Geometrical structure of the LMC is studied and its distance modulus is estimated from AGB tip magnitude. Inferences about the spatial structure of the LMC are obtained by standard candle analysis based on carbon-rich long-period variables. The evidence is presented for material out of plane of the main LMC disk. Based on a maximum-likelihood analysis of 2MASS photometry and stellar kinematics available in the literature, the conclusion is derived that a secondary stellar component is present at roughly ∼5 kpc behind the main LMC disk. This material has lower systemic velocity than the disk of the LMC and is shown to be able to enhance the microlensing optical depth and bring it to agreement with MACHO observations.

Indexing (details)


Subject
Astronomy;
Astrophysics
Classification
0606: Astronomy
0606: Astrophysics
Identifier / keyword
Pure sciences, Disk fields, Kinematics, Large Magellanic Cloud, Luminosity, Photometry, Stellar populations
Title
2MASS view of the LMC: Structure, populations, kinematics
Author
Nikolaev, Sergei
Number of pages
112
Publication year
2001
Degree date
2001
School code
0118
Source
DAI-B 62/04, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0493224866, 9780493224862
Advisor
Weinberg, Martin D.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3012171
ProQuest document ID
230775973
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/230775973
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