Spectroscopically- and spatially-resolved optical line emission in the Superantennae (IRAS 19254-7245)

Details Spectroscopically- and spatially-resolved optical line emission in the Superantennae (IRAS 19254-7245) Spectroscopically- and spatially-resolved optical line emission in the Superantennae (IRAS 19254-7245)

2009-07-16

arxiv.org/abs/0907.2846v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Scientific paper

We present VIMOS integral field spectroscopic observations of the ultraluminous infrared galaxy (ULIRG) pair IRAS 19254-7245 (the Superantennae). We resolve H alpha, [N II], [O I], and [S II] emission both spatially and spectroscopically and separate the emission into multiple velocity components. We identify spectral line emission characteristic of star formation associated with both galaxies, broad spectral line emission from the nucleus of the southern progenitor, and potential outflows with shock-excited spectral features near both nuclei. We estimate that <~10% of the 24 micron flux density originates from star formation, implying that most of the 24 micron emission originates from the AGN in the southern nucleus. We also measure a gas consumption time of ~1 Gyr, which is consistent with other measurements of ULIRGs.

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