Star Formation Enhancement in z=0 Close Major Mergers --- Spitzer Observations of a K-Band Selected Sample

Details Star Formation Enhancement in z=0 Close Major Mergers --- Spitzer Observations of a K-Band Selected Sample Star Formation Enhancement in z=0 Close Major Mergers --- Spitzer Observations of a K-Band Selected Sample

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630703x&link_type=abstract

American Astronomical Society, AAS Meeting #216, #307.03; Bulletin of the American Astronomical Society, Vol. 41, p.868

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Spitzer observations for a sample of close major-merger galaxy pairs (KPAIR sample) selected from 2MASS/SDSS-DR3 cross-matches. The goals are to study the star formation activity in these galaxies and to set a local bench mark for the cosmic evolution of close major mergers. The Spitzer sample (27 pairs, 54 galaxies) includes all spectroscopically confirmed spiral-spiral (S+S) and spiral-elliptical (S+E) pairs in a parent sample that is complete for primaries brighter than K=12.5 mag, projected separations of 51, SEP being the normalized separation parameter. These results reveal that enhanced star formation only occurs in a small fraction of close major-merger galaxies (i.e. some of the massive spirals in S+S pairs), and this is not determined by orbital parameters such as SEP. Our results challenge the current theory for interaction induced star formation.

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