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Shocked POststarburst Galaxy Survey. III. The Ultraviolet Properties of SPOGs

Ardila, Felipe and Alatalo, Katherine and Lanz, Lauranne and Appleton, Philip N. and Beaton, Rachael L. and Bitsakis, Theodoros and Cales, Sabrina L. and Falcón-Barroso, Jesús and Kewley, Lisa J. and Medling, Anne M. and Mulchaey, John S. and Nyland, Kristina and Rich, Jeffrey A. and Urry, C. Meg (2018) Shocked POststarburst Galaxy Survey. III. The Ultraviolet Properties of SPOGs. Astrophysical Journal, 863 (1). Art. No. 28. ISSN 1538-4357. doi:10.3847/1538-4357/aad0a3.

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The Shocked POststarburst Galaxy Survey (SPOGS) aims to identify galaxies in the transitional phase between actively star-forming and quiescence with nebular lines that are excited from shocks rather than star formation processes. We explored the ultraviolet (UV) properties of objects with near-ultraviolet (NUV) and far-ultraviolet (FUV) photometry from archival GALEX data; 444 objects were detected in both bands, 365 in only the NUV, and 24 in only the FUV, for a total of 833 observed objects. We compared SPOGs to samples of star-forming galaxies (SFs), quiescent galaxies (Qs), classical E+A post-starburst galaxies, active galactic nuclei (AGN) host galaxies, and interacting galaxies. We found that SPOGs have a larger range in their FUV–NUV and NUV–r colors compared with most of the other samples, although all of our comparison samples occupied color space inside of the SPOGs region. On the basis of their UV colors, SPOGs are a heterogeneous group, possibly made up of a mixture of SFs, Qs, and/or AGN. Using Gaussian mixture models, we are able to recreate the distribution of FUV–NUV colors of SPOGs and E + A galaxies with different combinations of SFs, Qs, and AGN. We find that the UV colors of SPOGs require a >60% contribution from SFs, with either Qs or AGN representing the remaining contribution, while UV colors of E + A galaxies required a significantly lower fraction of SFs, supporting the idea that SPOGs are at an earlier point in their transition from quiescent to star-forming than E + A galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ardila, Felipe0000-0002-6100-4852
Alatalo, Katherine0000-0002-4261-2326
Lanz, Lauranne0000-0002-3249-8224
Appleton, Philip N.0000-0002-7607-8766
Beaton, Rachael L.0000-0002-1691-8217
Bitsakis, Theodoros0000-0001-5787-8242
Cales, Sabrina L.0000-0002-0489-1686
Kewley, Lisa J.0000-0001-8152-3943
Medling, Anne M.0000-0001-7421-2944
Nyland, Kristina0000-0003-1991-370X
Rich, Jeffrey A.0000-0002-5807-5078
Urry, C. Meg0000-0002-0745-9792
Additional Information:© 2018 The American Astronomical Society. Received 2017 October 6; revised 2018 June 25; accepted 2018 June 28; published 2018 August 8. Support for this project was made possible by the collaboration between Princeton University and the Observatories of the Carnegie Institution. Support for KA is provided by NASA through Hubble Fellowship grant #HST-HF2-51352.001 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. Support for A.M.M. is provided by NASA through Hubble Fellowship grant #HST-HF2-51377 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. T.B. would like to acknowledge support from the CONACyT Research Fellowships program. K.N. acknowledges support from the grant associated with Spitzer proposal 11086. J.F.-B. acknowledges support from grant AYA2016-77237-C3-1-P from the Spanish Ministry of Economy and Competitiveness (MINECO). This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA's support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d'Etudes Spatiales of France and the Korean Ministry of Science and Technology. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is Facility: GALEX - Galaxy Evolution Explorer satellite, Sloan.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF2-51352.001
NASA Hubble FellowshipHST-HF2-51377
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2016-77237-C3-1-P
Alfred P. Sloan FoundationUNSPECIFIED
Participating InstitutionsUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:galaxies: evolution – galaxies: star formation – galaxies: stellar content – ultraviolet: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20180808-144652276
Persistent URL:
Official Citation:Felipe Ardila et al 2018 ApJ 863 28
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88669
Deposited By: Tony Diaz
Deposited On:09 Aug 2018 15:01
Last Modified:16 Nov 2021 00:28

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