The Nuclear Disk of M31

Details The Nuclear Disk of M31 The Nuclear Disk of M31

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3208p&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #32.08; Bulletin of the American Astronomical Society, Vol. 25, p.845

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We present near infrared (0.87, 1.04, 2.2, and 3.6 microns) images of the nucleus of M31 obtained with Hubble Space Telescope and the Hale 5-m telescope at Palomar. The images show a central disk with axis ratio b/a =~ 0.7 (at 2.2 and 3.6 microns) and position angle ~ 55deg , which is inclined at ~ 17deg with respect to the galaxy's major axis. Deconvolution of the 0.87 microns image by the HST PSF and re-convolution with the Palomar PSF indicates similar morphological structure in both the optical and the infrared. At all wavelengths there is a pronounced asymmetric elongation of ~ 20% to the SW of the peak emission of the nucleus. The FWHM of the disk along the major axis is 1.9'' in the K and L bands and is similar in the convolved optical image. We examine the properties of the disk as a function of wavelength, and discuss various models which might be invoked to explain the observations, such as a star cluster orbiting the kinematic center of the galaxy, a partially obscured disk or a flattened spheroid of stars.

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