A dataset provided by the European Space Agency

Name OT2_pappleto_2
Title Shock-excited Galaxies in the Green Valley in Compact Groups: Clues to Morphology Evolution in Dense Environments
URL

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DOI https://doi.org/10.5270/esa-72nzsux
Author appleton, p.
Description Compact groups of galaxies represent density enhancements in the Universe comparable with clusters and are dominated by early type galaxies that lie in the Green Valley between the blue and red sequence. Our observations of a sample of such groups has revealed that 10 percent of our targeted group members show unusually powerful mid-IR H2 emission lines relative to PAH emission--suggesting shock-excitation. Most of these galaxies lie in the optical green valley, and exhibit specific star formation rates that lie between spirals and elliptical suggesting that they are a transition population in which shocks may play a role in their color evolution. We propose to map key far-IR cooling lines [OI], [CII] and CO with the PACS and SPIRE spectrometers to both map and quantify the strength and distribution of shocks to search for clues about how they might be affected by their environment. We will also use PACS and SPIRE imaging to constrain dust SEDs to estimate SFRs and dust-gas masses to explore whether the shocks may heat the gas above the threshold for star formation--hence shutting down new star formation. Alternatively, by comparison with VLA HI maps which show considerable tidal material in the groups, we will search for evidence that accretion from tidal streams is responsible for re-igniting new star formation-thus modifying their optical colors. This proposal will, for the first time, test whether shocks may play a transformative role in galaxy evolution.
Publication Herschel observations of Hickson compact groups of galaxies: Unveiling the properties of cold dust . Bitsakis T. et al. . Astronomy & Astrophysics, Volume 565, id.A25, 31 pp. . 565 . 10.1051/0004-6361/201323349 . 2014A&A...565A..25B ,
Instrument SPIRE_SpireSpectrometer_, SPIRE_SpirePhoto_small, PACS_PacsRangeSpec_large, SPIRE_SpirePhoto_large, PACS_PacsPhoto_largeScan
Temporal Coverage 2012-03-03T00:43:37Z/2013-01-03T13:52:59Z
Version SPG v14.2.2
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 2013-07-03T13:45:34Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-07-03T13:45:34Z, OT2_pappleto_2, SPG v14.2.2. https://doi.org/10.5270/esa-72nzsux