Cobe's galactic bar and disk - INSPIRE

DataBETA

Cobe's galactic bar and disk

H.T. Freudenreich

Jul, 1997

30 pages

Published in:

Astrophys.J. 492 (1998) 495-510

e-Print:

astro-ph/9707340 [astro-ph]

DOI:

10.1086/305065

View in:

ADS Abstract Service

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Abstract: (arXiv)

A model of the bar and old stellar disk of the Galaxy has been derived from the survey of the Diffuse Infrared Background Experiment (DIRBE) of the Cosmic Background Explorer at wavelengths of 1.25, 2.2, 3.5, and 4.9 microns. It agrees very well with the data, except in directions in which the near- infrared optical depth is high. Among the conclusions drawn from the model: The Sun is located approximately 16.5 pc above the midpoint of the Galactic plane. The disk has an outer edge four kpc from the Sun, and is warped like the HI layer. It has a central hole roughly the diameter of the inner edge of the three-kiloparsec molecular cloud ring, and within that hole lies a bright, strong, early-type bar, tilted approximately 14 degrees from the Sun-Galactic center line. The model has 47 free parameters. The model is discussed in detail and contour plots and images of the residuals presented.

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