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The Herschel Virgo Cluster Survey: III. A constraint on dust grain lifetime in early-type galaxies

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arxiv 1005.3056 v1 pith:LVPWVJ3N submitted 2010-05-17 astro-ph.CO

The Herschel Virgo Cluster Survey: III. A constraint on dust grain lifetime in early-type galaxies

M. S. Clemens , A. P. Jones , A. Bressan , M. Baes , G. J. Bendo , S. Bianchi , D. J. Bomans , A. Boselli
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E. Corbelli L. Cortese A. Dariush J. I. Davies I. De Looze S. di Serego Alighieri D. Fadda J. Fritz D. A. Garcia-Appadoo G. Gavazzi C. Giovanardi M. Grossi T. M. Hughes L. K. Hunt S. Madden D. Pierini M. Pohlen S. Sabatini M. W. L. Smith J. Verstappen C. Vlahakis E. M. Xilouris S. Zibetti
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keywords dustgalaxiesearly-typeetgsherschelmediumconstraintcool
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Passive early-type galaxies (ETGs) provide an ideal laboratory for studying the interplay between dust formation around evolved stars and its subsequent destruction in a hot gas. Using Spitzer-IRS and Herschel data we compare the dust production rate in the envelopes of evolved AGB stars with a constraint on the total dust mass. Early-type galaxies which appear to be truly passively evolving are not detected by Herschel. We thus derive a distance independent upper limit to the dust grain survival time in the hostile environment of ETGs of < 46 +/- 25 Myr for amorphous silicate grains. This implies that ETGs which are detected at far-infrared wavelengths have acquired a cool dusty medium via interaction. Given likely time-scales for ram-pressure stripping, this also implies that only galaxies with dust in a cool (atomic) medium can release dust into the intra-cluster medium.

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    In the Spiderweb protocluster, passive fraction rises with local density to ~60% while passive mass–size intercepts sit between field and cluster values, indicating advanced quenching but ongoing size growth.