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:
-
- 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
- University of California Observatories – Lick Observatory, University of California Santa Cruz, 1156 High Str, Santa Cruz, CA 95064, USA
- McDonald Observatory, The University of Texas at Austin, 2515 Speedway Stop C1402, Austin, TX 78712, USA
- 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
- 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. https://doi.org/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. https://doi.org/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 = {Thu Feb 28 00:00:00 EST 2019},
month = {Thu Feb 28 00:00:00 EST 2019}
}
https://doi.org/10.1093/mnras/stz564
Web of Science
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Very extended cold gas, star formation and outflows in the halo of a bright quasar at z > 6
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Ionized gas outflows and global kinematics of low- z luminous star-forming galaxies
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Host Galaxy Identification for Supernova Surveys
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Triggered star formation at the borders of the H ii region Sh 2-217
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An ALMA [C ii] Survey of 27 Quasars at z > 5.94
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The MAGNUM survey: positive feedback in the nuclear region of NGC 5643 suggested by MUSE
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Formation and spatial distribution of hypervelocity stars in AGN outflows
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