Stellar populations in the Milky Way: bulge, halo, disk and star forming regions; ...
| Full text | |
| Author(s): |
Costa-Duarte, M. V.
;
O'Mill, A. L.
;
Duplancic, F.
;
Sodre, Jr., L.
;
Lambas, D. G.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 459, n. 3, p. 2539-2549, JUL 1 2016. |
| Web of Science Citations: | 2 |
| Abstract | |
We identify isolated galaxy triplets in a volume-limited sample from the Sloan Digital Sky Survey Data Release 10. Our final sample has 80 galaxy systems in the redshift range 0.04 less than or similar to z <= 0.1, brighter than M-r =-20.5 + 5 log h(70). Spectral synthesis results and WHAN and BPT diagnostic diagrams were employed to classify the galaxies in these systems as star-forming, active nuclei, or passive/retired. Our results suggest that the brightest galaxies drive the triplet evolution, as evidenced by the strong correlations between properties as mass assembly and mean stellar population age with triplet properties. Galaxies with intermediate luminosity or the faintest one within the triplet seem to play a secondary role. Moreover, the relation between age and stellar mass of galaxies is similar for these galaxies but different for the brightest galaxy in the system. Most of the triplet galaxies are passive or retired, according to the WHAN classification. Low-mass triplets present different fractions of WHAN classes when compared to higher mass triplets. A census of WHAN class combinations shows the dominance of star-forming galaxies in low-mass triplets while retired and passive galaxies prevail in high-mass systems. We argue that these results suggest that the local environment, through galaxy interactions driven by the brightest galaxy, is playing a major role in triplet evolution. (AU) | |
| FAPESP's process: | 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center |
| Grantee: | Elisabete Maria de Gouveia Dal Pino |
| Support type: | Multi-user Equipment Program |
| FAPESP's process: | 14/18632-6 - The cosmic web described by superclusters of galaxies |
| Grantee: | Marcus Vinícius Costa Duarte |
| Support type: | Scholarships in Brazil - Post-Doctorate |
| FAPESP's process: | 12/00800-4 - The 3-D universe: astrophysics with large galaxy surveys |
| Grantee: | Laerte Sodré Junior |
| Support type: | Research Projects - Thematic Grants |