|Extreme PDRs: hard stellar radiation at low metallicity.
|We propose to use the unique power ot Herschel to analyze the most extreme resolvable photdissociation regions, i.e. those at low metallicity and energized by hard radiation. With a modest investment of observing time, we will probe a unique part of parameter space, providing a strong lever arm to test the validity of PDR models. Furthermore, the conditions of low metallicity and hard field are exactly those which are more prevalent in the early universe compared to today, and increasingly important to understand the interstellar medium of early galaxies. The regions we propose to study in detail in the local universe are a unique window into how the first stars affected their environments, which we will not easily study at this resolution. The only PDRs close enough to resolve their structure and at low metallicity are in the Magellanic Clouds. There are only a few nebulae in the Clouds that are clearly energized by the extremely hard radiation from Wolf-Rayet Stars, and we will analyze two in each galaxy, which combined with our existing Spitzer and Herschel data will provide unprecedented information on PDR physics throughout the universe.
|A milestone toward understanding PDR properties in the extreme environment of LMC-30 Doradus . Chevance M. et al. . Astronomy & Astrophysics, Volume 590, id.A36, 20 pp. . 590 . 10.1051/0004-6361/201527735 . 2016A&A...590A..36C ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - II. Estimating radial velocity of SPIRE spectral observation sources . Scott Jeremy P. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4894S ,
The CO-dark molecular gas mass in 30 Doradus . Chevance Mélanie et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.494.5279C ,
Radiative and mechanical feedback into the molecular gas in the Large Magellanic Cloud. II. 30 Doradus . Lee M. -Y. et al. . Astronomy and Astrophysics . null . null . 2019A&A...628A.113L ,
|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_rindebet_1, SPG v14.2.0. https://doi.org/10.5270/esa-8ze0bbx