Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Printable Article (PDF/Postscript)
· Table of Contents
· References in the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
New insights into the dust lanes of the Galactic bar
Authors:
Marshall, D. J.; Fux, R.; Robin, A. C.; Reylé, C.
Publication:
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the conference held December 2-5, 2007 at the Hilton Hotel, Pasadena, CA, Eds.: K. Sheth, A. Noriega-Crespo, J. Ingalls, and R. Paladini, Published online at http://ssc.spitzer.caltech.edu/mtgs/ismevol/"
Publication Date:
01/2009
Origin:
AUTHOR
Keywords:
Galaxy: structure, Galaxy: center , ISM: kinematics and dynamics , ISM: dust, ISM: extinction
Bibliographic Code:
2009eimw.confE..38M

Abstract

Trails of dust inside galactic bars are easily observable in external galaxies. However, information on the dust lanes of the Milky Way is harder to obtain due to our position within the Galactic disc. By comparing the distribution of dust and gas in the central regions of the Galaxy, we aim to obtain new insights into the properties of the offset dust lanes leading the bar's major axis in the Milky Way. On one hand, the molecular emission of the dust lanes is extracted from the observed CO l-b-V distribution according to the interpretation of a dynamical model. On the other hand, a three dimensional extinction map of the Galactic central region constructed using near-infrared observations from 2MASS is used as a tracer of the dust itself and clearly reveals dust lanes in its face-on projection. Comparison of the position of both independent detections of the dust lanes is performed in the (l,b) plane. In both the gas and dust distributions, the dust lanes are found to be out of the Galactic plane, appearing at positive latitudes for l<0° and at negative latitudes for l>0°. However, the amplitude of the tilt is more pronounced for the molecular gas than for the dust resulting in the dust lying closer to the Galactic plane, on average, than the molecular gas. This type of study may be generalised to other stellar observations - work is currently underway to perform similar 3D studies of the ISM in the Galactic plane using the GLIMPSE point source catalogue.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints