Cosmic ray acceleration and nonthermal emission from ultra-fast outflows in active galactic nuclei

Susumu Inoue, Ruo Yu Liu, Ruoyu Liu, Kohta Murase

Research output: Contribution to journalConference article

Abstract

X-ray observations of active galactic nuclei (AGN) are revealing the widespread existence of ultra-fast outflows, which are powerful outflows of baryonic material approaching mildly relativistic velocities, seen as variable, blue-shifted absorption lines of ionized heavy elements [1]. Being observed in both radio-quiet [2] and radio-loud [3] AGN, they are distinct from the better studies radio jets. Plausibly interpreted as winds driven the accretion disk, their interaction with their environment may be the key cause of known correlations between the properties of supermassive black holes and their host galaxies [4]. We discuss the possibility of acceleration of electrons and hadrons in collisionless shocks that are likely to form at different locations in such outflows, including that of ultra-high-energy cosmic rays. We also present expectations for the consequent nonthermal emission from the radio band up to high-energy gamma-rays, in particular synchrotron and inverse Compton emission from accelerated electrons. These are compared with existing data on selected objects of interest such as the radio-quiet object ESO 323-G77 [5] (Fig.1) and the radio-loud object 3C 120 [6] (Fig.2. More details on the modeling, together with prospects for further observations with current and future instruments will be addressed at the conference and in a updated version of this proceedings paper.

Original languageEnglish (US)
Article number925
JournalProceedings of Science
Volume30-July-2015
StatePublished - Jan 1 2015
Event34th International Cosmic Ray Conference, ICRC 2015 - The Hague, Netherlands
Duration: Jul 30 2015Aug 6 2015

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nonthermal radiation
active galactic nuclei
cosmic rays
relativistic velocity
heavy elements
European Southern Observatory
accretion disks
hadrons
congressional reports
synchrotrons
electrons
shock
gamma rays
galaxies
energy
causes
x rays
interactions

All Science Journal Classification (ASJC) codes

  • General

Cite this

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title = "Cosmic ray acceleration and nonthermal emission from ultra-fast outflows in active galactic nuclei",
abstract = "X-ray observations of active galactic nuclei (AGN) are revealing the widespread existence of ultra-fast outflows, which are powerful outflows of baryonic material approaching mildly relativistic velocities, seen as variable, blue-shifted absorption lines of ionized heavy elements [1]. Being observed in both radio-quiet [2] and radio-loud [3] AGN, they are distinct from the better studies radio jets. Plausibly interpreted as winds driven the accretion disk, their interaction with their environment may be the key cause of known correlations between the properties of supermassive black holes and their host galaxies [4]. We discuss the possibility of acceleration of electrons and hadrons in collisionless shocks that are likely to form at different locations in such outflows, including that of ultra-high-energy cosmic rays. We also present expectations for the consequent nonthermal emission from the radio band up to high-energy gamma-rays, in particular synchrotron and inverse Compton emission from accelerated electrons. These are compared with existing data on selected objects of interest such as the radio-quiet object ESO 323-G77 [5] (Fig.1) and the radio-loud object 3C 120 [6] (Fig.2. More details on the modeling, together with prospects for further observations with current and future instruments will be addressed at the conference and in a updated version of this proceedings paper.",
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Cosmic ray acceleration and nonthermal emission from ultra-fast outflows in active galactic nuclei. / Inoue, Susumu; Liu, Ruo Yu; Liu, Ruoyu; Murase, Kohta.

In: Proceedings of Science, Vol. 30-July-2015, 925, 01.01.2015.

Research output: Contribution to journalConference article

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AU - Inoue, Susumu

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AU - Murase, Kohta

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AB - X-ray observations of active galactic nuclei (AGN) are revealing the widespread existence of ultra-fast outflows, which are powerful outflows of baryonic material approaching mildly relativistic velocities, seen as variable, blue-shifted absorption lines of ionized heavy elements [1]. Being observed in both radio-quiet [2] and radio-loud [3] AGN, they are distinct from the better studies radio jets. Plausibly interpreted as winds driven the accretion disk, their interaction with their environment may be the key cause of known correlations between the properties of supermassive black holes and their host galaxies [4]. We discuss the possibility of acceleration of electrons and hadrons in collisionless shocks that are likely to form at different locations in such outflows, including that of ultra-high-energy cosmic rays. We also present expectations for the consequent nonthermal emission from the radio band up to high-energy gamma-rays, in particular synchrotron and inverse Compton emission from accelerated electrons. These are compared with existing data on selected objects of interest such as the radio-quiet object ESO 323-G77 [5] (Fig.1) and the radio-loud object 3C 120 [6] (Fig.2. More details on the modeling, together with prospects for further observations with current and future instruments will be addressed at the conference and in a updated version of this proceedings paper.

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