The Active Fraction of Massive Black Holes in Dwarf Galaxies

Abstract

The population of massive black holes (MBHs) in dwarf galaxies is elusive, but fundamentally important to understand the coevolution of black holes with their hosts and the formation of the first collapsed objects in the Universe. While some progress was made in determining the X-ray detected fraction of MBHs in dwarfs, with typical values ranging from $0\%$ to $6\%$, their overall active fraction, $\mathcal{A}$, is still largely unconstrained. Here, we develop a theoretical model to predict the multiwavelength active fraction of MBHs in dwarf galaxies starting from first principles and based on the physical properties of the host, namely, its stellar mass and angular momentum content. We find multiwavelength active fractions for MBHs, accreting at typically low rates, ranging from $5\%$ to $22\%$, and increasing with the stellar mass of the host as $\mathcal{A}\sim ({\log }_{10}{M}_{\star }{)}^{4.5}$. If dwarfs are characterized by low-metallicity environments, the active fraction may reach $\sim 30\%$ for the most massive hosts. For galaxies with stellar mass in the range $10^7<M_{\star }[M_{\odot }]<10^{10}$, our predictions are in agreement with occupation fractions derived from simulations and semi-analytical models. Additionally, we provide a fitting formula to predict the probability of finding an active MBH in a dwarf galaxy from observationally derived data. This model will be instrumental to guide future observational efforts to find MBHs in dwarfs. The James Webb Space Telescope, in particular, will play a crucial role in detecting MBHs in dwarfs, possibly uncovering active fractions $\sim 3$ times larger than current X-ray surveys.

Accepted for publication in The Astrophysical Journal. This is the final version of the manuscript. 16 pages, 6 figures

References in corpus (39)

• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• Laser Interferometer Space Antenna
• The eROSITA X-ray telescope on SRG
• Formation of Supermassive Black Holes by Direct Collapse in Pregalactic Halos
• A Luminous Quasar at Redshift 7.642
• A New Sample of Low-mass Black Holes in Active Galaxies
• The evolution of massive black hole seeds
• Observational evidence for intermediate-mass black holes
• Rapid growth of seed black holes in the early universe by supra-exponential accretion
• Improved Dynamical Constraints on the Masses of the Central Black Holes in Nearby Low-mass Early-type Galactic Nuclei And the First Black Hole Determination for NGC 205
• Black Holes at the Centers of Nearby Dwarf Galaxies
• Spitzer Uncovers Active Galactic Nuclei Missed by Optical Surveys in 7 Late-type Galaxies
• Hidden AGN in dwarf galaxies revealed by MaNGA: light echoes, off-nuclear wanderers, and a new broad-line AGN
• X-rays across the galaxy population I: tracing the main sequence of star formation
• Massive black hole merger rates: the effect of kpc separation wandering and supernova feedback
• An X-ray Selected Sample of Candidate Black Holes in Dwarf Galaxies
• X-ray Detected AGN in SDSS Dwarf Galaxies
• A new channel to form IMBHs throughout cosmic time
• Radio jets from AGN in dwarf galaxies in the COSMOS survey: mechanical feedback out to redshift $\sim$3.4
• Origins and Demographics of Wandering Black Holes
• Conditions for Optimal Growth of Black Hole Seeds
• Populating the low-mass end of the $M_{\mathrm{BH}}-{\sigma }_{\ast }$ relation
• Black-hole-regulated star formation in massive galaxies
• Mass without radiation: heavily obscured AGN, the X-ray Background and the Black Hole Mass Density
• Exploring SMBH Assembly with Semi-analytic Modelling
• The SLUGGS Survey: stellar masses and effective radii of early-type galaxies from Spitzer Space Telescope 3.6$\mu$m imaging
• Hyperaccreting black holes in galactic nuclei
• Separating Accretion and Mergers in the Cosmic Growth of Black Holes with X-ray and Gravitational Wave Observations
• The Diagnostic Potential of JWST in Characterizing Elusive AGNs
• The most massive black holes on the Fundamental Plane of Black Hole Accretion
• Connecting the metallicity dependence and redshift evolution of high-mass X-ray binaries
• Do Some AGN Lack X-ray Emission?
• Dwarf galaxies might not be the birth sites of supermassive black holes
• Introducing the Search for Intermediate-mass Black-hole In Nearby Galaxy (SIBLING) Survey
• Finding Direct-Collapse Black Holes at Birth
• Feedback Limits to Maximum Seed Masses of Black Holes
• Multi-wavelength observations of SDSS J105621.45+313822.1, a broad-line, low-metallicity AGN
• A Low Incidence of Mid-Infrared Variability in Dwarf Galaxies
• Radio Power from a Direct-Collapse Black Hole in CR7

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