NDLI: X-ray emission from accretion disks in active galactic nuclei

Content Provider	Springer Nature Link
Author	Suleimav, V. F. Ghosh, K. K. Austin, R. A. Ramsey, B. D.
Copyright Year	2002
Abstract	We constructed a grid of relativistic models for standard high-relative-luminosity accretion α-disks around supermassive Kerr black holes (BHs) and computed X-ray spectra for their hot, effectively optically thin inner parts by taking into account general-relativity effects. They are known to be heated to high (∼10$^{6}$–10$^{9}$ K) temperatures and to cool down through the Comptonization of intrinsic thermal radiation. Their spectra are power laws with an exponential cutoff at high energies; i.e., they have the same shape as those observed in active galactic nuclei (AGNs). Fitting the observed X-ray spectra of AGNs with computed spectra allowed us to estimate the fundamental parameters of BHs (their mass and Kerr parameter) and accretion disks (luminosity and inclination to the line of sight) in 28 AGNs. We show that the Kerr parameter for BHs in AGNs is close to unity and that the disk inclination correlates with the Seyfert type of AGN, in accordance with the unification model of activity. The estimated BH masses M $_{x}$ are compared with the masses M $_{rev}$ determined by the reverberation mapping technique. For AGNs with luminosities close to the Eddington limit, these masses agree and the model under consideration may be valid for them. For low-relative-luminosity AGNs, the differences in masses increase with decreasing relative luminosity and their X-ray emission cannot be explained by this model.
Starting Page	745
Ending Page	754
Page Count	10
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	28
Issue Number	11
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2002-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	active galactic nuclei quasars radio galaxies X-ray emission disk accretion Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

X-ray variability in a complete sample of Soft X-ray selected AGN

Magnetic fields of active galactic nuclei and quasars: Redshift dependence

Interaction of the accretion flows in corona and disk near the black hole in active galactic nuclei

Star formation in accretion discs: from the Galactic center to active galactic nuclei

The X-ray and radio connection in low-luminosity active nuclei

Low-Luminosity Accretion in Black Hole X-Ray Binaries and Active Galactic Nuclei

Heating Hot Atmospheres with Active Galactic Nuclei

X-ray power law spectra in active galactic nuclei

Matter Outflows from AGN: A Unifying Model

X-ray emission from accretion disks in active galactic nuclei

Similar Documents

X-ray variability in a complete sample of Soft X-ray selected AGN

Magnetic fields of active galactic nuclei and quasars: Redshift dependence

Interaction of the accretion flows in corona and disk near the black hole in active galactic nuclei

Star formation in accretion discs: from the Galactic center to active galactic nuclei

The X-ray and radio connection in low-luminosity active nuclei

Low-Luminosity Accretion in Black Hole X-Ray Binaries and Active Galactic Nuclei

Heating Hot Atmospheres with Active Galactic Nuclei

X-ray power law spectra in active galactic nuclei

Matter Outflows from AGN: A Unifying Model

X-ray emission from accretion disks in active galactic nuclei