Environmental effects on the structure of the Dwarf Spheroidal Galaxies

Details Environmental effects on the structure of the Dwarf Spheroidal Galaxies Environmental effects on the structure of the Dwarf Spheroidal Galaxies

1995-09-15

arxiv.org/abs/astro-ph/9509081v1

Astronomy and Astrophysics

Astrophysics

14 pages, plain TEX, 4 figures soon available via ftp://boas3.bo.astro .it bap/files/ , get bap95-34fig*.ps or http://www.bo

Scientific paper

The central surface brightness ($\mu_V(0)$) of the dwarf spheroidal satellites of our own Galaxy is found to correlate with their distance from the Galactic Center ($R_{GC}$). This observational evidence suggests that environmental effects could strongly influence their structure. This suggestion is further supported by a clear-cut bivariate correlation linking $\mu_V(0)$ to a linear combination of $M_V$, the absolute integrated magnitude, and $R_{GC}$, which seems to be shared also by the M31 spheroidals. Possible implications for the Fundamental Plane of elliptical galaxies and Dark Matter content of dwarf spheroidals are also briefly discussed.

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