Contribution of Stellar Tidal Disruptions to the X-Ray Luminosity Function of Active Galaxies

Abstract

The luminosity function of active galactic nuclei has been measured down to luminosities ~10^{42} erg/s in the soft and hard X-rays. Some fraction of this activity is associated with the accretion of the material liberated by the tidal disruption of stars by massive black holes. We estimate the contribution to the X-ray luminosity function from the tidal disruption process. While the contribution depends on a number poorly known parameters, it appears that it can account for the majority of X-ray selected AGN with soft or hard X-ray luminosities <~10^{43}-10^{44} erg/s. If this is correct, a picture emerges in which a significant portion of the X-ray luminosity function of AGN is comprised of sources powered by tidal-disruption at the faint end, while the sources at the bright end are powered by non-stellar accretion. Black holes with masses <~2x10^6 Msun could have acquired most of their present mass by an accretion of tidal debris. In view of the considerable theoretical uncertainty concerning the detailed shape of the light curves of tidal disruption events, we focus on power-law luminosity decay (as identified in candidate tidal disruption events), but we also discuss constant accretion rate models.

arXiv comment5 pages, 1 figure

References in corpus (35)

• On the variation of the Initial Mass Function
• The Relation between Black Hole Mass, Bulge Mass, and Near-Infrared Luminosity
• Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background
• Cosmological Evolution of the Hard X-ray AGN Luminosity Function and the Origin of the Hard X-ray Background
• Supermassive Black Holes in Galactic Nuclei: Past, Present and Future Research
• The Centers of Early-Type Galaxies with HST. IV. Central Parameter Relations
• The Luminosity Function of Galaxies in SDSS Commissioning Data
• Luminosity-dependent evolution of soft X-ray selected AGN: New Chandra and XMM-Newton surveys
• The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
• Super-Eddington Fluxes from Thin Accretion Disks?
• Self-Regulated Growth of Supermassive Black Holes in Galaxies as the Origin of the Optical and X-ray Luminosity Functions of Quasars
• The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei
• Rates of tidal disruption of stars by massive central black holes
• Revised Rates of Stellar Disruption in Galactic Nuclei
• A Fundamental Relation Between Compact Stellar Nuclei, Supermassive Black Holes, and Their Host Galaxies
• Large-Amplitude X-ray Outbursts from Galactic Nuclei: A Systematic Survey Using ROSAT Archival Data
• Luminosity Function of Morphologically Classified Galaxies in the Sloan Digital Sky Survey
• The Centers of Early-Type Galaxies with HST III: Non-Parametric Recovery of Stellar Luminosity Distributions
• A Huge Drop in X-ray Luminosity of the Non-Active Galaxy RXJ1242.6-1119A, and First Post-Flare Spectrum - Testing the Tidal Disruption Scenario
• Gravitational Wave and X-ray Signals from Stellar Disruption by a Massive Black Hole
• The Low End of the Supermassive Black Hole Mass Function: Constraining the Mass of a Nuclear Black Hole in NGC 205 via Stellar Kinematics
• Tidal Disruption of a Solar Type Star by a Super-Massive Black Hole
• Luminosity-Dependent Quasar Lifetimes: A New Interpretation of the Quasar Luminosity Function
• No Supermassive Black Hole in M33?
• On the Vertical Structure of Radiation-Dominated Accretion Disks
• An Expanded RXTE Survey of X-ray Variability in Seyfert 1 Galaxies
• The Narrow-Line Regions of LINERs as Resolved with the Hubble Space Telescope
• Follow-Up Chandra Observations of Three Candidate Tidal Disruption Events
• The Link between Warm Molecular Disks in Maser Nuclei and Star Formation near the Black Hole at the Galactic Center
• The Giant X-Ray Flare of NGC 5905: Tidal Disruption of a Star, a Brown Dwarf, or a Planet?
• Dynamical Cusp Regeneration
• The Stream-Stream Collision after the Tidal Disruption of a Star Around a Massive Black Hole
• Black Hole Demographics
• Supersonic Collisions between Two Gas Streams
• Activity From Tidal Disruptions in Galactic Nuclei

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