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Infrared observation of the galatic [sic] center

Citation

Becklin, Eric E. (1968) Infrared observation of the galatic [sic] center. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-08272008-112642

Abstract

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Infrared radiation from the nucleus of the galaxy has been detected at effective wavelengths of 1.65, 2.2, 3.4 and 4.8 […] with angular resolutions from 0.04 to 1.8 arc min. Observations have been made over an area of 1 square degree surrounding the dynamical center of the Galaxy.

The reduced data consist of contour maps of the 2.2 […] brightness distribution of the galactic center region for resolutions of 1.8, 0.8, and 0.25 arc min, and of tabulations of the 1.65, 2.2, 3.4, and 4.8 […] flux densities and surface brightnesses at various areas in the galactic center region.

From the brightness distribution maps it is found that the structure consists of: (1) a dominant source 5 arc min in diameter, (2) a point-like source centered on the dominant source, (3) an extended background approximately 1 degree in diameter, (4) additional discrete extended sources which are fainter than the dominant source.

A comparison of the infrared and radio observations shows that the dominant infrared source and the radio source Sagittarius A have the same coordinates and similar sizes.

An analysis of the observed infrared radiation predicts about 25 magnitudes of visual absorption between the Sun and the galactic center if the source of infrared radiation is stellar. A comparison is also made between the infrared radiation from the galactic center and that from the nucleus of M 31 which shows agreement in both the apparent structure and infrared luminosity of the two nuclei.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Neugebauer, Gerry
Thesis Committee:
  • Unknown, Unknown
Defense Date:13 May 1968
Record Number:CaltechETD:etd-08272008-112642
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-08272008-112642
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3251
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:10 Sep 2008
Last Modified:26 Dec 2012 02:58

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