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| DOI | 10.1093/MNRAS/STAA899 | ||||
| Año | 2020 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We identify and characterize compact dwarf starburst (CDS) galaxies in the REsolved Spectroscopy Of a Local VolumE (RESOLVE) survey, a volume-limited census of galaxies in the local Universe, to probe whether this population contains any residual `blue nuggets,' a class of intensely star-forming compact galaxies first identified at high redshift z. Our 50 low-z CDS galaxies are defined by dwarf masses (stellar mass M* < 109.5 M circle dot), compact bulged-disc or spheroid-dominated morphologies (using a quantitative criterion, mu (Delta) > 8.6), and specific star formation rates (SSFRs) above the defining threshold for high- z blue nuggets (log SSFR [Gyr-1] > -0.5). Across redshifts, blue nuggets exhibit three defining properties: compactness relative to contemporaneous galaxies, abundant cold gas, and formation via compaction in mergers or colliding streams. Those with halo mass below Mhalo similar to 1011.5 M circle dot may in theory evade permanent quenching and cyclically refuel until the present day. Selected only for compactness and starburst activity, our CDS galaxies generally have Mhalo similar to 1011.5 M similar to and gas-to-stellar mass ratio similar to 1. Moreover, analysis of archival DECaLS photometry and new 3D spectroscopic observations for CDS galaxies reveals a high rate of photometric and kinematic disturbances suggestive of dwarf mergers. The SSFRs, surface mass densities, and number counts of CDS galaxies are compatible with theoretical and observational expectations for redshift evolution in blue nuggets. We argue that CDS galaxies represent a maximally starbursting subset of traditional compact dwarf classes such as blue compact dwarfs and blue E/S0s. We conclude that CDS galaxies represent a low-z tail of the blue nugget phenomenon formed via a moderated compaction channel that leaves open the possibility of disc regrowth and evolution into normal disc galaxies.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Palumbo, Michael L. | Hombre |
UNIV N CAROLINA - Estados Unidos
PENN STATE UNIV - Estados Unidos The University of North Carolina at Chapel Hill - Estados Unidos Pennsylvania State University - Estados Unidos |
| 2 | Kannappan, Sheila J. | Mujer |
UNIV N CAROLINA - Estados Unidos
The University of North Carolina at Chapel Hill - Estados Unidos |
| 3 | Frazer, Elaine M. | Mujer |
Space Telescope Sci Inst - Estados Unidos
STScI - Estados Unidos Space Telescope Science Institute - Estados Unidos |
| 4 | Eckert, Kathleen D. | Mujer |
UNIV PENN - Estados Unidos
University of Pennsylvania - Estados Unidos |
| 5 | Norman, Dara J. | Mujer |
Natl Opt Astron Observ - Estados Unidos
National Optical Astronomy Observatory - Estados Unidos |
| 6 | Fraga, Luciano | Hombre |
Lab Nacl Astrofis LNA MCTIC - Brasil
Laboratorio Nacional de Astrofisica, Itajuba - Brasil |
| 7 | Quint, B. | Hombre |
SOAR Telescope - Chile
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| 8 | Santos, W. A. | Hombre |
Aix Marseille Univ - Francia
Laboratoire d'Astrophysique de Marseille - Francia Aix Marseille Université - Francia |
| 9 | MENDES-DE OLIVEIRA, CLAUDIA LUCIA | Mujer |
UNIV SAO PAULO - Brasil
Universidade de Sao Paulo - USP - Brasil Universidade de São Paulo - Brasil |
| 10 | Bittner, Ashley S. | Mujer |
North Carolina State Univ - Estados Unidos
NC State University - Estados Unidos |
| 11 | Moffett, Amanda J. | Mujer |
Univ North Georgia - Estados Unidos
University of North Georgia - Estados Unidos |
| 12 | Stark, David V. | Hombre |
Univ Tokyo - Japón
The University of Tokyo - Japón |
| 13 | Norris, Mark A. | Hombre |
Univ Cent Lancashire - Reino Unido
University of Central Lancashire - Reino Unido |
| 14 | Cleaves, Nathaniel T. | Hombre |
UNIV N CAROLINA - Estados Unidos
The University of North Carolina at Chapel Hill - Estados Unidos |
| 15 | Carr, Derrick S. | Hombre |
UNIV N CAROLINA - Estados Unidos
The University of North Carolina at Chapel Hill - Estados Unidos |
| Fuente |
|---|
| North Carolina SpaceGrant Consortium |
| CNPqBrazil |
| National Space Grant College and Fellowship Program |
| Agradecimiento |
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| We are grateful to the anonymous referee whose comments have improved this work. We thank Vianney Lebouteiller for insightful comments and suggestions that greatly contributed to this work. MP acknowledges the financial support of the National Space Grant College and Fellowship Program and the North Carolina SpaceGrant Consortium. LF acknowledges the support fromCNPqBrazil. This work is in part based on observations obtained at the Southern Astrophysical Research (SOAR) telescope with the SIFS (Lepine et al. 2003) and SAM FP (Mendes de Oliveira et al. 2017) instruments. SOAR is a joint project of the Ministerio da Cincia, Tecnologia, Inovacoes e Comunicacoes (MCTIC) do Brasil, the U.S. National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). This work is in part based on observations obtained at the Gemini Observatory acquired through the Gemini Observatory Archive and processed using the Gemini IRAF package, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina), and Ministerio da Ciencia, Tecnologia e Inovacao (Brazil). We acknowledge the use of DECam Legacy Survey data, which has made use of the resources described at http://legacysurvey.org/acknowledgment/. |