| Apresentação/Painel: | |
| Autor: | Patricia Martins de Novais |
| Walter Augusto Santos | |
| Laerte Sodré Jr. | |
| Cláudia Mendes de Oliveira | |
| Instituição: | IAG/USP - São Paulo |
| Formato: | Painel |
| Título: | Merging pairs of galaxies in the SDSS |
| Resumo: | Galaxy mergers play a paramount role in galaxy evolution in the hierarchical scenario, and close galaxy pairs can be considered precursors of these events. In the present work we describe the results of a search for close galaxy pairs in the Data Release 6 of the Sloan Digital Sky Survey (SDSS). The search procedure was based on the classical work of Karachentsev (1972), as well as on the work of Allam et al. (2004), who performed an automated search for merging pairs of galaxies in the Early Data Release of SDSS. We have built a catalog of galaxy pairs up to redshift z=0.1 and analyzed their environment within a 0.5 h70-1 Mpc radius, taking into account redshifts (photometric and spectroscopic, when available) of nearby galaxies. After, we have selected only isolated pairs, assuming a criterion similar to that adopted for fossil groups (Santos et al. 2007), with the difference in the r-band magnitude between the magnitude of the pair and the next brightest galaxy within the survey radius above is larger than 2. Our preliminary results show that around 3,5% of the galaxy pairs found in SDSS can be considered isolated, according to the fossil group criterion. Moreover, through the comparison of the colors of close and isolated pairs, we verified that in ~39% (~30%) of close (isolated) pairs both galaxies are early-type and ~42% of pairs in both samples are mixed (early-type late-type). |
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