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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 720162.0, MPI für Astronomie / Publikationen_mpia
Galaxy interactions increase star formation rates
Authors:Knapen, J. H.; Cisternas, M.; Querejeta, M.; Figueras, F.; Hernández-Monteagudo, C.; Trujillo Bueno, J.; Valdivielso, L.
Place of Publication:Barcelona
Publisher:Spanish Astronomical Society
Date of Publication (YYYY-MM-DD):2015
Audience:Not Specified
Abstract / Description:We investigate the influence of galaxy-galaxy interactions on the star formation by studying a sample of almost 1500 of the nearest galaxies, all within a distance of 40 Mpc. We calculate the relative enhancement of the massive star formation rate (SFR), as measured from far-IR emission, and the specific star formation rate (SSFR), which is the former quantity normalised by the stellar mass of the galaxy. We do this for each galaxy by normalising by the median SFR and SSFR values of individual control populations of similar non-interacting galaxies. We find that both the SFR and the SSFR are enhanced in interacting galaxies, and more so as the degree of interaction is higher. The increase is, however, moderate, reaching a maximum of a factor of 2.2 for the highest degree of interaction (mergers). We argue that this study based on a representative sample of nearby galaxies should be used to place strong constraints on studies based on samples of galaxies at larger distances, beyond the local Universe.
External Publication Status:published
Document Type:Other
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2015hsa8.conf..240K
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