Seminars and Colloquia at ESO/Santiago

For ESO and ESO-related Conferences and Workshops in Europe and Chile please check the main Conferences and Workshops page.


Broadcast of the ESO talks is available upon request.  If anyone is interested, kindly contact us via email
at least 60 min prior  to the beginning of the talk.


March 2015

17.03.15 (Tuesday)
12:00
"The Nature of Star Formation Quenching in Unlikely Sources"
Katherine ALATALO (IPAC)
Abstract
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"The Nature of Star Formation Quenching in Unlikely Sources"

Katherine ALATALO (IPAC)

Abstract

Feedback on the interstellar medium of galaxies by outflows driven by Active Galactic Nuclei is an essential component of many models of galaxy formation, but an example of an AGN outflow directly affecting the star formation (SF) efficiency in the resident molecular gas has not been observed. Here we present millimeter-wave observations from ALMA and CARMA of the gas and dust continuum of NGC 1266, which hosts an AGN-driven outflow, finding that SF is very suppressed in the nuclear region. The ratio of the SF rate surface density (ΣSFR) to the gas surface density (ΣH2) reveals that SF is suppressed by a factor of ≈ 70 in the molecular gas compared to normal star-forming galaxies. The AGN-driven outflow can account for this extreme suppression by injecting turbulence into the molecular gas, regulating SF while simultaneously hindering black hole growth, providing an example of regulation that can the M-σ relation at intermediate scales. Finding galaxies like NGC1266 has the potential to shed light on the nature of galaxy transformation, and I discuss the Shocked Poststarburst Galaxy (SPOGS) survey, designed to find these "needles in the haystack", which has discovered both some expected, as well as unexpected results.


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