BALQSO spectra explained by shock disruption of galactic clouds

Meir Zeilig-Hess; Amir Levinson; Xinfeng Xu; Nahum Arav

doi:10.1093/MNRAS/STZ3352

BALQSO spectra explained by shock disruption of galactic clouds

Meir Zeilig-Hess, Amir Levinson, Xinfeng Xu, Nahum Arav

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Blue-shifted broad absorption lines (BALs) detected in quasar’s spectra are indicative of active galactic nuclei (AGN) outflows. We show, using 2D hydrodynamical simulations, that disruption of interstellar clouds by a fast AGN wind can lead to formation of cold, dense high-speed blobs that give rise to broad absorption features in the transmission spectrum of the AGN continuum source. For a wind velocity of 0.1c and sufficiently high cloud density (n_c 10⁴ cm⁻³; depending on size), absorption troughs with velocities up to about 3000 km s⁻¹can be produced. For slower winds and/or lower cloud density, the anticipated velocity of the absorbing clouds should be smaller.

Original language	English
Pages (from-to)	4325-4333
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	491
Issue number	3
DOIs	https://doi.org/10.1093/MNRAS/STZ3352
State	Published - 2020

Keywords

Galaxies: active
ISM: clouds
ISM: jets and outflows
Quasars: absorption lines

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10.1093/MNRAS/STZ3352

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title = "BALQSO spectra explained by shock disruption of galactic clouds",

abstract = "Blue-shifted broad absorption lines (BALs) detected in quasar{\textquoteright}s spectra are indicative of active galactic nuclei (AGN) outflows. We show, using 2D hydrodynamical simulations, that disruption of interstellar clouds by a fast AGN wind can lead to formation of cold, dense high-speed blobs that give rise to broad absorption features in the transmission spectrum of the AGN continuum source. For a wind velocity of 0.1c and sufficiently high cloud density (nc 104 cm−3; depending on size), absorption troughs with velocities up to about 3000 km s−1can be produced. For slower winds and/or lower cloud density, the anticipated velocity of the absorbing clouds should be smaller.",

keywords = "Galaxies: active, ISM: clouds, ISM: jets and outflows, Quasars: absorption lines",

author = "Meir Zeilig-Hess and Amir Levinson and Xinfeng Xu and Nahum Arav",

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year = "2020",

doi = "10.1093/MNRAS/STZ3352",

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T1 - BALQSO spectra explained by shock disruption of galactic clouds

AU - Zeilig-Hess, Meir

AU - Levinson, Amir

AU - Xu, Xinfeng

AU - Arav, Nahum

PY - 2020

Y1 - 2020

N2 - Blue-shifted broad absorption lines (BALs) detected in quasar’s spectra are indicative of active galactic nuclei (AGN) outflows. We show, using 2D hydrodynamical simulations, that disruption of interstellar clouds by a fast AGN wind can lead to formation of cold, dense high-speed blobs that give rise to broad absorption features in the transmission spectrum of the AGN continuum source. For a wind velocity of 0.1c and sufficiently high cloud density (nc 104 cm−3; depending on size), absorption troughs with velocities up to about 3000 km s−1can be produced. For slower winds and/or lower cloud density, the anticipated velocity of the absorbing clouds should be smaller.

AB - Blue-shifted broad absorption lines (BALs) detected in quasar’s spectra are indicative of active galactic nuclei (AGN) outflows. We show, using 2D hydrodynamical simulations, that disruption of interstellar clouds by a fast AGN wind can lead to formation of cold, dense high-speed blobs that give rise to broad absorption features in the transmission spectrum of the AGN continuum source. For a wind velocity of 0.1c and sufficiently high cloud density (nc 104 cm−3; depending on size), absorption troughs with velocities up to about 3000 km s−1can be produced. For slower winds and/or lower cloud density, the anticipated velocity of the absorbing clouds should be smaller.

KW - Galaxies: active

KW - ISM: clouds

KW - ISM: jets and outflows

KW - Quasars: absorption lines

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JF - Monthly Notices of the Royal Astronomical Society

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BALQSO spectra explained by shock disruption of galactic clouds

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Keywords

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