Luz difusa em grupos compactos próximos

Details Luz difusa em grupos compactos próximos Luz difusa em grupos compactos próximos

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...27d&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 27-27

Astronomy and Astrophysics

Astronomy

Scientific paper

The study of the diffuse light content of a group may represent an efficient tool for the determination of how long compact groups have been together in a compact configuration. This is one of the most important questions regarding the nature of this kind of structure and their dynamical stage. Using a new approach based on wavelet techniques, to detect low surface brightness signals, we have analyzed B and R band observations of four compact groups (HCG 79, HCG 88, HCG 92 e HCG 95). The wavelet technique uses the "à trous" algorithm to separate the photometric structures in the image into characteristic sizes, allowing an individual study of the point sources, galaxies and diffuse envelope. Our analysis indicates the presence of a considerable amount of diffuse, intragroup light in two of them (HCG 79 and HCG 95). This diffuse component is presumably due to stellar material tidally stripped from the galaxy group members and has a mean color of (B-R) = 1.4 - 1.5+/-0.1, in good agreement with the colors measured in the outer parts of the member galaxies. The fractions of the total group light detected as a diffuse component in the R band were: 18%, 12%, 3% and 0% for groups HCG 95, HCG 79, HCG 92 and HCG 88, respectively.

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