Dust Destruction by Drift-Induced Sputtering in Active Galactic Nuclei

Abstract

Recent mid-infrared high spatial resolution observations have revealed that active galactic nuclei (AGNs) may host a polar dust region with the size of several pc, and such dust may be carried by radiation from the central engine. The polar dust emission often exhibits very weak or absence of the silicate 10-$\mu$m emission feature. A possible explanation is that the polar dust is dominated by micron-sized large grains because these grains do not show the silicate feature, while it remains unclear how large grains are preferentially supplied to the polar region. We here propose a new scenario describing the prevalence of large grains at the polar region. We show that grains are accelerated to the hypersonic drift velocity by the radiation pressure from AGN, and the hypersonic drift results in dust destruction via kinetic sputtering. Sputtering destroys small grains faster than the large ones, and thus larger grains will be preferentially blown over longer distance. Although the hypersonic drift, or kinetic sputtering, tends to be suppressed for very small grains due to the Coulomb drag, they might also be disrupted by Coulomb explosion. Removal of small grains and/or survival of large grains may explain the lack of a silicate 10-$\mu$m emission feature in polar dust emission.

arXiv comment17 pages, 14 Figures; Accepted for publication in ApJ

References in corpus (52)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
• AGN Dusty Tori: I. Handling of Clumpy Media
• Photoelectric Emission from Interstellar Dust: Grain Charging and Gas Heating
• Scattering by Interstellar Dust Grains. II. X-Rays
• Resolving the mid-infrared cores of local Seyferts
• A diversity of dusty AGN tori: Data release for the VLTI/MIDI AGN Large Program and first results for 23 galaxies
• Torus and AGN properties of nearby Seyfert galaxies: Results from fitting IR spectral energy distributions and spectroscopy
• Reverberation Measurements of the Inner Radius of the Dust Torus in 17 Seyfert Galaxies
• The dusty torus in the Circinus galaxy: a dense disk and the torus funnel
• Dust in the polar region as a major contributor to the IR emission of AGN
• ALMA resolves the torus of NGC 1068: continuum and molecular line emission
• The subarcsecond mid-infrared view of local active galactic nuclei: II. The mid-infrared--X-ray correlation
• The subarcsecond mid-infrared view of local active galactic nuclei: I. The N- and Q-band imaging atlas
• Testing the Unification Model for AGN in the Infrared: are the obscuring tori of Type 1 and 2 Seyferts different?
• The distribution of silicate strength in Spitzer spectra of AGNs and ULIRGs
• The dusty heart of nearby active galaxies. I. High-spatial resolution mid-IR spectro-photometry of Seyfert galaxies
• Dusty winds in active galactic nuclei: reconciling observations with models
• Parsec-scale dust emission from the polar region in the type 2 nucleus of NGC 424
• Dust Destruction in the High-Velocity Shocks Driven by Supernovae in the Early Universe
• Dust inflated accretion disc as the origin of the Broad Line Region in Active Galactic Nuclei
• Mapping the radial structure of AGN tori
• Redefining the torus: A unifying view of AGN in the infrared and sub-mm
• Mid-infrared interferometry of 23 AGN tori: On the significance of polar-elongated emission
• Deep Mid-Infrared Silicate Absorption as a Diagnostic of Obscuring Geometry Toward Galactic Nuclei
• AKARI IRC infrared 2.5-5 micron spectroscopy of a large sample of luminous infrared galaxies
• Spitzer/IRS 5-35 um Low-Resolution Spectroscopy of the 12 um Seyfert Sample
• Multi-phase Nature of a Radiation-Driven Fountain with Nuclear Starburst in a Low-mass Active Galactic Nucleus
• AGN Obscuring Tori Supported by Infrared Radiation Pressure
• The Complete Infrared View of Active Galactic Nuclei from the 70-month Swift/BAT Catalog
• On the difference of torus geometry between hidden and non-hidden broad line active galactic nuclei
• BAT AGN Spectroscopic Survey - XI. The Covering Factor of Dust and Gas in Swift/BAT Active Galactic Nuclei
• Dissecting the active galactic nucleus in Circinus -- I. Peculiar mid-IR morphology explained by a dusty hollow cone
• Mid and Far Infrared Properties of a Complete Sample of Local AGNs
• The 1<z<5 Infrared Luminosity Function of Type I Quasars
• Photoelectric Emission from Dust Grains Exposed to Extreme Ultraviolet and X-ray Radiation
• Polar Dust, Nuclear Obscuration and IR SED Diversity in Type-1 AGNs
• Radiation Pressure Confinement - I. Ionized Gas in the ISM of AGN Hosts
• Obscuring Fraction of Active Galactic Nuclei: Implications from Radiation-driven Fountain Models
• New evidence for the dusty wind model: Polar dust and a hot core in the type-1 Seyfert ESO323-G77
• ALMA 0.1-0.2 arcsec resolution imaging of the NGC 1068 nucleus - compact dense molecular gas emission at the putative AGN location
• Radiation-driven outflows from and radiative support in dusty tori of active galactic nuclei
• A complete census of silicate features in the mid-infrared spectra of active galaxies
• AKARI IRC 2.5-5 um Spectroscopy of Infrared Galaxies over a Wide Luminosity Range
• Formulation of Non-steady-state Dust Formation Process in Astrophysical Environments
• 3D Radiation hydrodynamics of a dynamical torus
• On the photoelectric quantum yield of small dust particles
• Gravitational waves from supermassive black hole binaries in ultra-luminous infrared galaxies
• Cooling timescale of dust tori in dying active galactic nuclei
• Relativistic Gas Drag on Dust Grains and Implications

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• Hypercubes of AGN Tori (HYPERCAT) -- I. Models and Image Morphology
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• Dust beyond the torus: Revealing the mid-infrared heart of local Seyfert ESO 428-G14 with JWST/MIRI
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• The VMC Survey -- XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds
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