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9.5. The “double nucleus” of M31 in J, H, and K

Published online by Cambridge University Press:  25 May 2016

P. Hinz
Affiliation:
Steward Observatory, University of Arizona
K. Hege
Affiliation:
Steward Observatory, University of Arizona
D. McCarthy
Affiliation:
Steward Observatory, University of Arizona
M. Lloyd-Hart
Affiliation:
Steward Observatory, University of Arizona
F. Melia
Affiliation:
Steward Observatory, University of Arizona

Extract

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Hubble Space Telescope images of the nucleus of M31 show a double-peaked structure with the primary peak being offset from the center by approximately 0.5″. We observed the central 13″ of M31 in the J, H, and Ks passbands to determine the nuclear structure in the near-infrared. Observations were taken at the MMT Observatory, using a low-order adaptive optics system, FASTTRAC II (Gray et. al. 1995). The diffraction limit for the system is 0.25″ in K band. PSF images showed correction to 0.5″ FWHM. Uncorrected images showed the seeing to be about 1″. The images were deconvolved using several methods to check for consistency. We used Iterative-Blind Deconvolution, Richardson-Lucy, and Wiener filter algorithms, getting similar results for each. Measurements suggest the PSF in the deconvolved images is approximately 0.35″ FWHM.

Type
Part III. Black Holes and Central Activity
Copyright
Copyright © Kluwer 1998 

References

Gray, et al., 1995, Proc. SPIE conf. on Adaptive Optical Systems and Applications, ed. Tyson, R.K. & Fugate, R.Q., 2534, 2.Google Scholar
Lauer, T.R. et al. 1993, AJ, 1436.Google Scholar