Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..49...12p&link_type=abstract
ESO Messenger (ISSN 0722-6691), Sept. 1987, v. 49, p. 12-14.
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Galactic Structure, Astronomical Models, Cosmic Dust, Parameter Identification
Scientific paper
The results of the observations of the shell galaxy NGC 3923 with a 3.6-m telescope equipped with the ESO Faint Object Spectrograph and Camera system are described. Five photographs were taken with the same orientation, moving the telescope slightly between each exposure. To obtain the picture of shells around NGC 3923, which are faint and cannot be distinguished from the bright background of the galaxy, the luminosity profile of NGC 3923 was computed and used to construct a model for the galaxy; when this background was subtracted, shells appeared clearly. Accurate positions of shells and the measurements of physical parameters were compared to existing theoretical models and numerical simulations, indicating that models published until now do not fully account for the properties that were observed.
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