Unusual PAH Emission in Elliptical Galaxies

Details Unusual PAH Emission in Elliptical Galaxies Unusual PAH Emission in Elliptical Galaxies

2006-04-18

arxiv.org/abs/astro-ph/0604369v1

Astronomy and Astrophysics

Astrophysics

To appear in proceedings of "The Spitzer Science Center 2005 Conference: Infrared Diagnostics of Galaxy Evolution", held in Pa

Scientific paper

In a sample of thirty normal elliptical galaxies observed with the Spitzer IRS, one galaxy, NGC4697, shows strong PAH emission, but with an apparently weak 7.7 micron feature. We find that the PAH emission is confined to the central regions of the galaxy and that once a quiescent elliptical galaxy spectrum is subtracted, the PAH feature ratios are normal. We show that the PAH spectrum resembles the diffuse ISM of our galaxy rather than an HII region, and is not indicative of a starburst galaxy. We suggest that the PAHs in NGC4697 are consistent with a recent but now past burst of star formation.

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