|Toward the Mass and Origin of Dust in Early-Type Galaxies
|The origin and evolution of the dust in early-type galaxies are two of the key questions to understanding their evolution at late times. The two main scenarios to produce their dust are in situ formation from the winds of cool giants and the accretion of small, gas-rich satellite galaxies. The later scenario appears to be the only viable explanation for the several orders of magnitude variation in the amount of dust at fixed stellar mass, as in situ formation implies that the dust content should approximately scale linearly with stellar mass. Yet our demographic studies of a well-selected sample of early-types show that dust is present in roughly half of them, which implies a very high merger rate given the expected short lifetime of dust in their hot ISM. We propose SPIRE photometry of 11 of the 45 early-type galaxies in our previous Spitzer and HST studies. These 11 galaxies have 3-channel MIPS photometry, HST images, and deep ground-based photometry and spectroscopy. There are 12 additional galaxies that meet these criteria and already have executed or planned observations. Our goal is to measure the cold dust masses for these galaxies and thus determine the likelihood that the dust originates from minor, gas-rich mergers. The SPIRE data are critical to accurately measure the dust masses in these galaxies as the vast majority are active and thus may have a substantial hot dust component that biases mass estimates from the existing, shorter-wavelength IR photometry. These data will be combined with archival SPIRE data for the remaining 12 galaxies with detections in our Spitzer study to measure the distribution of dust masses our representative sample of early-type galaxies and thereby better constrain the origin of the dust.
|DustPedia: Multiwavelength photometry and imagery of 875 nearby galaxies in 42 ultraviolet-microwave bands . Clark C. J. R. et al. . Astronomy & Astrophysics, Volume 609, id.A37, 30 pp. . 609 . 10.1051/0004-6361/201731419 . 2018A&A...609A..37C ,
Probing the spectral shape of dust emission with the DustPedia galaxy sample . Nersesian Angelos et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2021MNRAS.506.3986N ,
A nearby galaxy perspective on dust evolution. Scaling relations and constraints on the dust build-up in galaxies with the DustPedia and DGS samples . Galliano Frédéric et al. . Astronomy and Astrophysics . null . null . 2021A&A...649A..18G ,
Dust emissivity and absorption cross section in DustPedia late-type galaxies . Bianchi S. et al. . Astronomy and Astrophysics . null . null . 2019A&A...631A.102B ,
DustPedia: the relationships between stars, gas, and dust for galaxies residing in different environments . Davies J. I. et al. . Astronomy and Astrophysics . null . null . 2019A&A...626A..63D ,
Old and young stellar populations in DustPedia galaxies and their role in dust heating . Nersesian A. et al. . Astronomy and Astrophysics . null . null . 2019A&A...624A..80N ,
Fraction of bolometric luminosity absorbed by dust in DustPedia galaxies . Bianchi S. et al. . Astronomy & Astrophysics, Volume 620, id.A112, 21 pp. . 620 . 10.1051/0004-6361/201833699 . 2018A&A...620A.112B ,
UV to submillimetre luminosity functions of TNG50 galaxies . Trčka Ana et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2022MNRAS.516.3728T ,
DustPedia: A Definitive Study of Cosmic Dust in the L...
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, OT2_pmartini_1, SPG v14.1.0. https://doi.org/10.5270/esa-bjcr2gp