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 European Space Agency
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, Shock-Excited Galaxies In The D_Commagreen Valleyd_Comma In Compact Groups: Clues To Morphology Evolution In Dense Environments, SPG v14.2.2, European Space Agency, https://doi.org/10.5270/esa-72nzsux