A dataset provided by the European Space Agency

Name OT2_pguillar_6
Title PACS on the cap: probing the dissipation of kinetic energy in the M82 superwind


DOI 10.5270/esa-73tdis6
Author guillard, p.
Description Starburst-driven outflows -superwinds- are ubiquitous in galaxies with intense star-formation and are a complex phenomenon, literally requiring observations at every wavelength to unravel their energetics, outflow rates, and cosmological significance. We propose here, as part of a comprehensive study to understand the entrainment of material in winds, [OI] and [CII] spectroscopy with PACS of the "cap" in M82. The cap is a region of emission well out of the plane of M82 and provides the most robust evidence that winds escape. But this may not be true. Only through an understanding the how entrainment cools the wind material can we say this with any surety. That requires understanding how the wind energy is dissipated in entrained material like the cap. The proposed PACS observations follow our recent and puzzling detections of bright H2 rotational and [SiII] line emission with Spitzer IRS in the cap, as well as a non-detection of CO(1-0) and (2-1) in deep spectroscopy with the IRAM 30m telescope. The far-IR [OI] and [CII] lines will uniquely probe the relative contributions of the shock vs. photo-ionization in the cap. The cap offers a particularly clean environment to model the wind-cloud interaction. The results will be a critical test of a detailed physical model we are developing to describe the dissipation of kinetic energy in multiphase winds. This is a crucial step in understanding less detailed, high-redshift observations of superwinds, as well as the importance of winds for the evolution of galaxies and the inter-galactic medium.
Instrument PACS_PacsLineSpec_point
Temporal Coverage 2012-11-11T05:07:36Z/2012-11-11T16:03:21Z
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 2013-05-11T10:36:32Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-05-11T10:36:32Z, OT2_pguillar_6, SPG v14.2.0. https://doi.org/10.5270/esa-73tdis6