Influence of major merger on radio emission of elliptical galaxies

Details Influence of major merger on radio emission of elliptical galaxies Influence of major merger on radio emission of elliptical galaxies

2012-04-12

arxiv.org/abs/1204.2599v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 5 figures, 1 table, accepted for publication in A&A

Scientific paper

We investigate the influence of major merger on radio emission of elliptical galaxies. We use a complete sample of close pairs, which contains 475 merging and 1828 non-merging paired elliptical galaxies of M_r<-21.5 selected from SDSS. In addition, a control sample of 2000 isolated field galaxies is used for comparison. We cross-identify the optical galaxies with radio surveys of FIRST and NVSS. We find that the radio fraction of merging paired galaxies is about 6%, slightly higher than 5% for non-merging paired galaxies, but they are still consistent with each other due to the large uncertainty caused by the limited sample. It is double as that of isolated galaxies which is less than 3%. Radio emission of elliptical galaxies is only slightly affected by major merger, but dominantly depends on their optical luminosities. Therefore, merging is not important in triggering radio emission of elliptical galaxies.

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