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. © ESO 2010.

Clemens, M., Jones, A., Bressan, A., Baes, M., Bendo, G., Bianchi, S., et al. (2010). The Herschel Virgo Cluster Survey. III. A constraint on dust grain lifetime in early-type galaxies. ASTRONOMY & ASTROPHYSICS, 518(4), L50-L50 [10.1051/0004-6361/201014533].

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

GAVAZZI, GIUSEPPE;
2010

Abstract

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. © ESO 2010.
Articolo in rivista - Articolo scientifico
galaxies: elliptical and lenticular, cD; galaxies: ISM; infrared: galaxies;
English
2010
518
4
L50
L50
L50
none
Clemens, M., Jones, A., Bressan, A., Baes, M., Bendo, G., Bianchi, S., et al. (2010). The Herschel Virgo Cluster Survey. III. A constraint on dust grain lifetime in early-type galaxies. ASTRONOMY & ASTROPHYSICS, 518(4), L50-L50 [10.1051/0004-6361/201014533].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/48730
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