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Inner-Truncated Disks – Are They Tied to Bars?

Published online by Cambridge University Press:  12 April 2016

W. E. Baggett ,
S. M. Baggett  and
K. S. J. Anderson
W. E. Baggett
Affiliation:
Computer Sciences Corporation Astronomy Programs, STScI, Baltimore, MD 21218
S. M. Baggett
Affiliation:
STScI, 3700 San Martin Dr., Baltimore, MD 21218
K. S. J. Anderson
Affiliation:
Dept. of Astron., New Mexico State Univ., Las Cruces, NM 88003

Extract

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An inner-truncated disk (ITD) brightness profile is one in which the inward extrapolation of the outer disk surface brightness significantly exceeds the observed surface brightness in a region near the galaxy center. Freeman (1970) identified these profiles as Type II profiles. Fourteen of Freeman’s (1970) sample of 36 external galaxies are designated as Type II (ITD); seven of the ITD’s are classified as barred galaxies and ITD’s are found at all morphological types.

Ohta, Hamabe, & Wakamatsu (1990) report that luminosity profiles perpendicular to the bars of six early-type galaxies all exhibit the Freeman Type II shape, while the feature is lost when azimuthally averaged profiles of the same galaxies are studied. They postulate that the bar formation resulted in an azimuthal redistribution of the stars, but no net radial redistribution.

Type
Posters for Part I and Part II
Information
International Astronomical Union Colloquium , Volume 157: Barred Galaxies , 1996 , pp. 91 - 93
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

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