| Name | OT1_aleroy_1 |
| Title | Dust-Based Molecular Gas Maps of Nearby Low-Metallicity Galaxies |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342223640&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-mn3r3wr |
| Author | leroy, a. |
| Description | We propose deep PACS 100 and 160 micron imaging of three nearby, star-forming, low metallicity galaxies. These data will allow us to make sensitive, high-resolution estimates of dust mass. We will combine these measurements with our in-hand HI maps to measure the dust-to-gas ratio and estimate the molecular gas (H2) content in each galaxy. This is a challenging measurement that requires requires the resolution of PACS and good sensitivity, but H2 masses at low metallicity are very difficult to estimate by any other means. We will use these H2 measurements to test recent models of H2 formation in galaxies, improve the calibration of the CO-to-H2 conversion factor, and assess the efficiency of star formation from H2 at low metallicity. We will also be able to put constraints on the life cycle of dust at low metallicity from gradients in the dust-to-gas ratio. These are all open questions that can best be addressed by observing the molecular gas in low metallicity galaxies. Carrying out such an experiment outside the Local Group is necessary something that only Herschel can do. |
| Publication | 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 , Reproducing the Universe: a comparison between the EAGLE simulations and the nearby DustPedia galaxy sample . Trčka Ana et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.494.2823T , 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 , Dust grain size evolution in local galaxies: a comparison between observations and simulations . Relaño M. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2022MNRAS.515.5306R , Fraction of bolometric luminosity absorbed by dust in Dust... |
| Instrument | PACS_PacsPhoto_largeScan |
| Temporal Coverage | 2011-07-03T17:57:58Z/2011-10-30T12:31:08Z |
| Version | SPG v14.2.0 |
| Mission Description | 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. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2012-04-30T08:47:17Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, leroy, a., 2012, OT1_aleroy_1, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-mn3r3wr |