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Title: Widespread star formation inside galactic outflows

Abstract

Abstract Several models have predicted that stars could form inside galactic outflows and that this would be a new major mode of galaxy evolution. Observations of galactic outflows have revealed that they host large amounts of dense and clumpy molecular gas, which provide conditions suitable for star formation. We have investigated the properties of the outflows in a large sample of galaxies by exploiting the integral field spectroscopic data of the large MaNGA-SDSS4 galaxy survey. We find evidence for prominent star formation occurring inside at least 30 per cent of the galactic outflows in our sample, whilst signs of star formation are seen in up to half of the outflows. We also show that even if star formation is prominent inside many other galactic outflows, this may have not been revealed as the diagnostics are easily dominated by the presence of even faint active galactic nucleus and shocks. If very massive outflows typical of distant galaxies and quasars follow the same scaling relations observed locally, then the star formation inside high-z outflows can be up to several 100 $$\rm M_{\odot }~yr^{-1}$$ and could contribute substantially to the early formation of the spheroidal component of galaxies. Star formation in outflows can also potentially contribute to establishing the scaling relations between black holes and their host spheroids. Moreover, supernovae exploding on large orbits can chemically enrich in situ and heat the circumgalactic and intergalactic medium. Finally, young stars ejected on large orbits may also contribute to the reionization of the Universe.

Authors:
 [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Ave., Cambridge CB3 0HE, UK, Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
  2. University of California Observatories – Lick Observatory, University of California Santa Cruz, 1156 High Str, Santa Cruz, CA 95064, USA
  3. McDonald Observatory, The University of Texas at Austin, 2515 Speedway Stop C1402, Austin, TX 78712, USA
  4. Departamento de Astronomia, Av. Bento Goncalves 9500, Agronomia, Porto Alegre, RS 91501-970, Brazil, Laboratório Interinstitucional de e-Astronomia, Rua General José Cristino, 77 Vasco da Gama, Rio de Janeiro 20921-400, Brazil
  5. Laboratório Interinstitucional de e-Astronomia, Rua General José Cristino, 77 Vasco da Gama, Rio de Janeiro 20921-400, Brazil, Departamento de Fisica, Universidade Federal de Santa Maria, CEP 97105-900 Santa Maria, RS, Brazil
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1501969
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 485 Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Gallagher, R., Maiolino, R., Belfiore, F., Drory, N., Riffel, R., and Riffel, R. A. Widespread star formation inside galactic outflows. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz564.
Gallagher, R., Maiolino, R., Belfiore, F., Drory, N., Riffel, R., & Riffel, R. A. Widespread star formation inside galactic outflows. United Kingdom. doi:10.1093/mnras/stz564.
Gallagher, R., Maiolino, R., Belfiore, F., Drory, N., Riffel, R., and Riffel, R. A. Thu . "Widespread star formation inside galactic outflows". United Kingdom. doi:10.1093/mnras/stz564.
@article{osti_1501969,
title = {Widespread star formation inside galactic outflows},
author = {Gallagher, R. and Maiolino, R. and Belfiore, F. and Drory, N. and Riffel, R. and Riffel, R. A.},
abstractNote = {Abstract Several models have predicted that stars could form inside galactic outflows and that this would be a new major mode of galaxy evolution. Observations of galactic outflows have revealed that they host large amounts of dense and clumpy molecular gas, which provide conditions suitable for star formation. We have investigated the properties of the outflows in a large sample of galaxies by exploiting the integral field spectroscopic data of the large MaNGA-SDSS4 galaxy survey. We find evidence for prominent star formation occurring inside at least 30 per cent of the galactic outflows in our sample, whilst signs of star formation are seen in up to half of the outflows. We also show that even if star formation is prominent inside many other galactic outflows, this may have not been revealed as the diagnostics are easily dominated by the presence of even faint active galactic nucleus and shocks. If very massive outflows typical of distant galaxies and quasars follow the same scaling relations observed locally, then the star formation inside high-z outflows can be up to several 100 $\rm M_{\odot }~yr^{-1}$ and could contribute substantially to the early formation of the spheroidal component of galaxies. Star formation in outflows can also potentially contribute to establishing the scaling relations between black holes and their host spheroids. Moreover, supernovae exploding on large orbits can chemically enrich in situ and heat the circumgalactic and intergalactic medium. Finally, young stars ejected on large orbits may also contribute to the reionization of the Universe.},
doi = {10.1093/mnras/stz564},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 485,
place = {United Kingdom},
year = {2019},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1093/mnras/stz564

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