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Title:
Infrared speckle observations of the nucleus of M31
Authors:
Spillar, E. J.; Canterna, R.; Carels, K. H.; Benson, J. A.; Dyck, H. M.
Affiliation:
AA(Wyoming Infrared Observatory, Laramie), AB(Wyoming Infrared Observatory, Laramie), AC(Wyoming Infrared Observatory, Laramie), AD(Wyoming Infrared Observatory, Laramie), AE(Wyoming Infrared Observatory, Laramie)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 349, Jan. 20, 1990, p. L13-L16. (ApJL Homepage)
Publication Date:
01/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ANDROMEDA GALAXY, GALACTIC NUCLEI, INFRARED ASTRONOMY, SPECKLE INTERFEROMETRY, ASTRONOMICAL MODELS, BRIGHTNESS DISTRIBUTION, GALACTIC BULGE, GALACTIC STRUCTURE, INFRARED SPECTROSCOPY
DOI:
10.1086/185639
Bibliographic Code:
1990ApJ...349L..13S

Abstract

Two-micron (K band), one-dimensional speckle observations of the center of M31 have been obtained with the Wyoming Infrared Observatory's 2.3 m telescope. Visibility curves have been produced and compared with a three-component model consisting of a nucleus, an inner bulge, and an outer bulge. The bulge model is based on Kent's r band surface brightness measurements. A variable size compact nuclear source is superposed on the inner bulge. The FWHM of the compact nuclear source from the model which best fits the data is 0.1 arcsec (a diameter of 0.35 pc), with a range of possible values from 0.5 arcsec FWHM (a diameter of 1.7 pc) to an unresolved point. From the best model it is inferred that the nuclear source contributes up to 11 percent of the K band flux within a 6.2 arcsec aperture centered on the nucleus.

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