Feedback by Massive Black Holes in Gas-rich Dwarf Galaxies

Could there be intermediate-mass black holes in essentially all old dwarf galaxies? I argue that current observations of active galactic nuclei in dwarfs allow such a radical hypothesis that provides early feedback during the epoch of galaxy formation and potentially provides a unifying explanation...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2017-04, Vol.839 (1), p.L13-L13
Main Author: Silk, Joseph
Format: Article
Language:English
Subjects:
ABUNDANCE
Active galactic nuclei
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BARYONS
BLACK HOLES
Black holes (astronomy)
Cold dark matter
Dwarf galaxies
FEEDBACK
GALAXIES
galaxies: active
galaxies: dwarf
galaxies: formation
Galaxy formation
GALAXY NUCLEI
HYPOTHESIS
MASS
NONLUMINOUS MATTER
Physics
Radicals
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Description
Summary:Could there be intermediate-mass black holes in essentially all old dwarf galaxies? I argue that current observations of active galactic nuclei in dwarfs allow such a radical hypothesis that provides early feedback during the epoch of galaxy formation and potentially provides a unifying explanation for many, if not all, of the dwarf galaxy anomalies, such as the abundance, core-cusp, "too-big-to-fail," ultra-faint, and baryon-fraction issues. I describe the supporting arguments, which are largely circumstantial, and discuss a number of tests. There is no strong motivation for modifying the nature of cold dark matter in order to explain any of the dwarf galaxy "problems."
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/aa67da