A dataset provided by the European Space Agency

Name OT2_ulisen01_2
Title Herschel observations of nearby mergers: understanding the process of star-formation along cosmic time


DOI 10.5270/esa-5xymlb8
Author lisenfeld, u.
Description We propose to observe a small sample of nearby major mergers in three different merging stages with Herschel PACS and SPIRE photometers. The observations will allow us to derive the dust surface density and from this the total gas surface density. Together with already available tracers of the SFR (Spitzer 24 micron and GALEX FUV) we can study the Kennicutt-Schmidt law. High resolution data of the atomic gas content (partly already available and partly applied for at the EVLA) allow us furthermore to make a distinction between atomic and molecular gas. The derivation of the total gas mass via the dust emission involves less serious uncertainties than the use of CO as a tracer of the molecular gas. With these observation we aim to address the open question why merging galaxies form stars at about a 10 times higher rate compared to their gas mass than quiescent galaxies. Our recent numerical models explain this by a higher turbulence which make the step from low-density to high-density (star--forming) gas more efficient. It makes specific prediction about the efficiency of the conversion from atomic to molecular gas, which directly affects the ratio between SFR and gas mass, as a function of merger stage. The selection of our sample and the proposed observations will allow us to test the predictions of the simulations and provide therefore an opportunity to improve our understanding of the physical processes underlying star-formation and of the cosmic star formation history
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 ,
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 ,
Instrument PACS_PacsPhoto_largeScan, SPIRE_SpirePhoto_large
Temporal Coverage 2013-02-21T17:57:41Z/2013-03-25T00:03:50Z
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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-09-24T23:47:35Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-09-24T23:47:35Z, OT2_ulisen01_2, SPG v14.2.0. https://doi.org/10.5270/esa-5xymlb8