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28 March 2024 |
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Shocked POststarbust Galaxy Survey I: Candidate Poststarbust Galaxies with Emission Line Ratios Consistent with Shocks | Katherine Alatalo
; Sabrina L. Cales
; Jeffrey A. Rich
; Philip N. Appleton
; Lisa J. Kewley
; Mark Lacy
; Lauranne Lanz
; Anne M. Medling
; Kristina Nyland
; | Date: |
19 Jan 2016 | Abstract: | [Abridged] There are many mechanisms by which galaxies can transform from
blue, star-forming spirals to red, quiescent early-type galaxies, but our
current census of them does not form a complete picture. Recent studies of
nearby case studies seem to have identified a population of galaxies that
quench "quietly." Traditional poststarburst searches seem to catch galaxies
only after they have quenched and transformed, and thus miss any objects with
additional ionization mechanisms exciting the remaining gas. The Shocked
POststarburst Galaxy Survey (SPOGS) aims to identify galaxies in an earlier
phase of transformation, in which the nebular lines are excited via shocks
instead of through star formation processes. Utilizing the OSSY measurements on
the Sloan Digital Sky Survey Data Release 7 catalog, we applied Balmer
absorption and shock boundary criteria to identify 1,067 SPOG candidates
(SPOGs*) within z = 0.2. SPOGs* represent 0.7% of emission line galaxies (and
0.2% of OSSY). SPOGs* colors suggest that they are in an earlier phase of
transition than traditionally selected poststarburst galaxies. Quenching
timescales are consistent with shock dissipation timescales. SPOGs* have
stronger Na I D absorption than predicted from the stellar population,
suggestive of interstellar winds. It appears that SPOGs* represent an earlier
phase in galaxy transformation than traditionally selected poststarburst
galaxies, and a large proportion of SPOGs* also have properties consistent with
disruption of their interstellar media. Studying this sample of SPOGs* further,
including their morphologies, active galactic nuclei properties, and
environments, has the potential for us to build a more complete picture of the
initial conditions that can lead to a galaxy evolving by finding galaxies
previously not identified as transforming. | Source: | arXiv, 1601.5085 | Services: | Forum | Review | PDF | Favorites |
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