Ubiquitous thermal instability in active galactic nuclei outflows

Tomer Holczer; Ehud Behar

doi:https://doi.org/10.1063/1.3701363

Ubiquitous thermal instability in active galactic nuclei outflows

Tomer Holczer, Ehud Behar

Technion - Israel Institute of Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

We analyze the HETGS Chandra and XMM-Newton X-ray spectrum of several type 1 AGNs (Active Galactic Nuclei) which harbor outflows: NGC3783, NGC3516, NGC7469, NGC5548, IRAS 13349+2438, and MCG -6-30-15. Absorption from almost all charge states of Fe are usually detected. This allows for a detailed reconstruction of the absorption measure distribution (AMD), which we define as the distribution of column density as a function of ionization parameter. We find a double peaked AMD for all the tested AGNs. All sources feature a deep minimum in column density consistent with no absorption from gas at temperatures of 4.5<log T<5 (K). We interpret the minima as observational evidence for thermal instability in this temperature regime. Observing this minima in all the objects we tested leads us to believe that could all AGN outflows have this thermal instability.

Original language	English
Title of host publication	Waves and Instabilities in Space and Astrophysical Plasmas
Pages	218-225
Number of pages	8
DOIs	https://doi.org/10.1063/1.3701363
State	Published - 2012
Event	Workshop on Waves and Instabilities in Space and Astrophysical Plasmas - Eilat, Israel Duration: 19 Jun 2011 → 24 Jun 2011

Publication series

Name	AIP Conference Proceedings
Volume	1439

Conference

Conference	Workshop on Waves and Instabilities in Space and Astrophysical Plasmas
Country/Territory	Israel
City	Eilat
Period	19/06/11 → 24/06/11

Keywords

Galaxies: active
Galaxies: spectroscopic
Line: formation
X-rays: galaxies

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Access to Document

https://doi.org/10.1063/1.3701363

Cite this

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title = "Ubiquitous thermal instability in active galactic nuclei outflows",

abstract = "We analyze the HETGS Chandra and XMM-Newton X-ray spectrum of several type 1 AGNs (Active Galactic Nuclei) which harbor outflows: NGC3783, NGC3516, NGC7469, NGC5548, IRAS 13349+2438, and MCG -6-30-15. Absorption from almost all charge states of Fe are usually detected. This allows for a detailed reconstruction of the absorption measure distribution (AMD), which we define as the distribution of column density as a function of ionization parameter. We find a double peaked AMD for all the tested AGNs. All sources feature a deep minimum in column density consistent with no absorption from gas at temperatures of 4.5",

keywords = "Galaxies: active, Galaxies: spectroscopic, Line: formation, X-rays: galaxies",

author = "Tomer Holczer and Ehud Behar",

year = "2012",

doi = "https://doi.org/10.1063/1.3701363",

language = "الإنجليزيّة",

isbn = "9780735410312",

series = "AIP Conference Proceedings",

pages = "218--225",

booktitle = "Waves and Instabilities in Space and Astrophysical Plasmas",

note = "Workshop on Waves and Instabilities in Space and Astrophysical Plasmas ; Conference date: 19-06-2011 Through 24-06-2011",

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T1 - Ubiquitous thermal instability in active galactic nuclei outflows

AU - Holczer, Tomer

AU - Behar, Ehud

PY - 2012

Y1 - 2012

N2 - We analyze the HETGS Chandra and XMM-Newton X-ray spectrum of several type 1 AGNs (Active Galactic Nuclei) which harbor outflows: NGC3783, NGC3516, NGC7469, NGC5548, IRAS 13349+2438, and MCG -6-30-15. Absorption from almost all charge states of Fe are usually detected. This allows for a detailed reconstruction of the absorption measure distribution (AMD), which we define as the distribution of column density as a function of ionization parameter. We find a double peaked AMD for all the tested AGNs. All sources feature a deep minimum in column density consistent with no absorption from gas at temperatures of 4.5

AB - We analyze the HETGS Chandra and XMM-Newton X-ray spectrum of several type 1 AGNs (Active Galactic Nuclei) which harbor outflows: NGC3783, NGC3516, NGC7469, NGC5548, IRAS 13349+2438, and MCG -6-30-15. Absorption from almost all charge states of Fe are usually detected. This allows for a detailed reconstruction of the absorption measure distribution (AMD), which we define as the distribution of column density as a function of ionization parameter. We find a double peaked AMD for all the tested AGNs. All sources feature a deep minimum in column density consistent with no absorption from gas at temperatures of 4.5

KW - Galaxies: active

KW - Galaxies: spectroscopic

KW - Line: formation

KW - X-rays: galaxies

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U2 - https://doi.org/10.1063/1.3701363

DO - https://doi.org/10.1063/1.3701363

M3 - منشور من مؤتمر

SN - 9780735410312

T3 - AIP Conference Proceedings

SP - 218

EP - 225

BT - Waves and Instabilities in Space and Astrophysical Plasmas

T2 - Workshop on Waves and Instabilities in Space and Astrophysical Plasmas

Y2 - 19 June 2011 through 24 June 2011

ER -

Ubiquitous thermal instability in active galactic nuclei outflows

Abstract

Publication series

Conference

Keywords

All Science Journal Classification (ASJC) codes

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