NICMOS Imaging of the Cores of M 31 and M 32

Details NICMOS Imaging of the Cores of M 31 and M 32 NICMOS Imaging of the Cores of M 31 and M 32

2001-02-01

arxiv.org/abs/astro-ph/0102023v2

Astronomy and Astrophysics

Astrophysics

To appear in May 2001 Astronomical Journal; 18 pages, 8 figures

Scientific paper

We present 1.1, 1.6, and 2.2 micron images of the cores of the Local Group galaxies M 31 and M 32 obtained with the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) instrument of the Hubble Space Telescope. These images are also compared to optical images of the galaxies obtained with the HST Wide Field Planetary Camera 2 (WFPC2). In M 31 the nucleus remains distinctly asymmetric in all of the infrared bands, with no evidence of concentrated dust, although the distinction between the two nuclei, P1 and P2, is not as strong as in the WFPC and WFPC2 images. This result is nonetheless consistent with the model of the nucleus as an eccentric stellar disk produced by the dynamical influence of a central supermassive black hole. Several individual M-giant stars are detected within ~ 3" of the nuclei, and may represent stars that have escaped from the disk and phase-mixed around the nuclear center of mass. In M 32 we also do not find strong evidence of dust, and the brightness profiles within the central ~ 1" of the infrared images can be fitted by a power law of the same form as that fitted to the optical images. The infrared color profiles of the central few arcseconds of M 32 show no strong gradients, and indicate a population dominated by K-giant stars. This is consistent with recent groud-based spectroscopy and photometry of the core region, which similarly show no strong gradients in age or metallicity within its stellar population.

Affiliated with

Also associated with

No associations

Rating

NICMOS Imaging of the Cores of M 31 and M 32 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with NICMOS Imaging of the Cores of M 31 and M 32, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NICMOS Imaging of the Cores of M 31 and M 32 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-202773