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• W3100552430 abstract "Context. The traditional knowledge of the mechanisms that brought to the formation and evolution of early type galaxies (ETG) in a hierarchical Universe was challenged by the unexpected finding by ATLAS 3D that 86% ETGs show signs of a fast rotating disk at their interior, implying an origin common to most spiral galaxies, followed by a quenching phase, while only a minority of the most massive systems are slow rotators and were likely to be the products of merger events. Aims. Our aim is to improve our knowledge on the content and distribution of ionised hydrogen and their usage to form stars in a representative sample of ETGs for which the kinematics and detailed morphological classification were known from ATLAS 3D . Methods. Using narrow-band filters centered on the redshifted H α line along with a broad-band ( r -Gunn) filter to recover the stellar continuum, we observed or collected existing imaging observations for 147 ETG (including members of the Virgo cluster), representative of the whole ATLAS 3D survey. Results. 55 ETGs (37%) were detected in the H α line above our detection threshold (H α EW ≤ −1 Å) and 21 harbour a strong source (H α EW ≤ −5 Å) . Conclusions. The strong H α emitters appear associated with mostly low-mass ( M * ~ 10 10 M ⊙ ) S0 galaxies which contain conspicuous stellar and gaseous disks, harbouring significant star formation at their interior, including their nuclei. The weak H α emitters are almost one order of magnitude more massive, contain gas-poor disks and harbour an AGN at their centers. Their emissivity is dominated by [NII] and does not imply star formation. The 92 undetected ETGs constitute the majority in our sample and are gas-free systems which lack a disk and exhibit passive spectra even in their nuclei. These pieces of evidence reinforce the conclusion of Cappellari (2016, ARA&A, 54, 597) that the evolution of ETGs followed the secular channel for the less massive systems and the dry merging channel for the most massive galaxies at the center of clusters of galaxies." @default.
• W3100552430 created "2020-11-23" @default.
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• W3100552430 date "2018-03-01" @default.
• W3100552430 modified "2023-09-25" @default.
• W3100552430 title "H<i>α</i> imaging observations of early-type galaxies from the ATLAS^3D survey" @default.
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• W3100552430 doi "https://doi.org/10.1051/0004-6361/201731074" @default.
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