Halpha3: an Halpha imaging survey of HI selected galaxies from ALFALFA. III. Nurture shapes up the Hubble sequence in the Great Wall
Giuseppe Gavazzi, Giulia Savorgnan, Matteo Fossati, Massimo Dotti,, Michele Fumagalli, Alessandro Boselli, Leonel Gutierrez, Hector Hernandez, Toledo, Riccardo Giovanelli, Martha P. Haynes

TL;DR
This study uses Halpha imaging to examine how environment influences galaxy evolution in the Coma Supercluster, revealing a sequence of gas depletion and star formation quenching driven by environmental factors like ram-pressure stripping.
Contribution
It provides a detailed observational sequence linking gas content, star formation, and morphology in galaxies affected by environment, highlighting ram-pressure as a key transformation mechanism.
Findings
Identification of a four-step galaxy sequence based on gas content and star formation.
Evidence that environmental effects cause radial outside-in quenching of star formation.
Estimation that 100 low-mass galaxies are accreted into the Coma cluster per Gyr over 7.5 Gyr.
Abstract
We present the analysis of Halpha3, an Halpha imaging survey of galaxies selected from the HI ALFALFA Survey in the Coma Supercluster. By using the Halpha line as a tracer of the "instantaneous" star formation, complemented with optical colors from SDSS we explore the hypothesis that a morphological sequence of galaxies of progressively earlier type, lower gas-content exists in the neighborhood of the Coma cluster, with specific star formation activity decreasing with increasing local galaxy density and velocity dispersion. In the dwarf regime (8.5<\log(M*)< 9.5) we identify a 4-step sequence of galaxies with progressively redder colors, i.e. of decreasing specific star formation, from (1) HI-rich Late-Type Galaxies belonging to the blue-cloud exhibiting extended plus nuclear star formation, (2) HI-poor LTGs with nuclear star formation only, (3) HI-poor galaxies with no star formation…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Gamma-ray bursts and supernovae
