|Herschel study of the ISM in Local Group dwarf ellipticals
|de looze, i.
|Taking into consideration that dwarf galaxies are by number the dominant population in the current Universe and are considered as the main building blocks for more massive galaxies, studying their origin and evolution allows putting strong constraints on cosmological parameters. Especially, the ISM of metal-poor dwarf galaxies provides an interesting laboratory to study the outcome of stellar feedback and the effect of this metal-enrichment on future star formation. Since dwarfs with a low metal abundance are the best present-day representatives for the conditions in the early Universe, they offer the best opportunity to learn more about the evolution of this galaxy type throughout the history of the Universe. In particular, the proximity of the Local Group enables spatially resolved studies of the lowest surface brightness dwarf galaxies and benefits from a wealth of available ancillary data. NGC 205, NGC 185 and NGC 147 are three metal-poor dwarf elliptical companions of M31, featuring a ten times less massive gaseous component than predicted from theoretical star fomation models. Either efficient supernova feedback or the presence of a more diffuse ISM component are thought to be responsible for the missing ISM problem. We propose to probe the ISM through the continuum emission from dust, to better constrain the ISM mass. Recent Herschel observations for NGC 205 confirm the missing ISM problem in this galaxy. We propose to probe the ISM in NGC 185 and NGC 147 with Herschel. With a dust mass detection limit of virgul10^2 Msun, SPIRE observations are considered capable of detecting the ISM in NGC147 for the very first time. The unprecedented resolution at PACS wavelengths allows spatially resolved studies of the dust heating mechanisms, dust characteristics (temperature, composition, distribution) and its correlation with the gaseous component, which well shed light on the typical star formation conditions and,... in this way, allow a better understanding of their origin and evolution.
|The interstellar medium in Andromeda.s dwarf spheroidal galaxies - I. Content and origin of the interstellar dust . De Looze Ilse et al. . Monthly Notices of the Royal Astronomical Society, Volume 459, Issue 4, p.3900-3916 . 459 . 10.1093/mnras/stw868 . 2016MNRAS.459.3900D ,
The interstellar medium in Andromeda.s dwarf spheroidal galaxies - II. Multiphase gas content and ISM conditions . De Looze Ilse et al. . Monthly Notices of the Royal Astronomical Society, Volume 465, Issue 3, p.3741-3758 . 465 . 10.1093/mnras/stw3001 . 2017MNRAS.465.3741D ,
|PACS_PacsPhoto_largeScan, SPIRE_SpirePhoto_large, PACS_PacsLineSpec_large, PACS_PacsLineSpec_point
|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_idelooze_1, SPG v14.2.0. https://doi.org/10.5270/esa-thdjwh8