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Determining the spin of the Black Hole in the Active Galactic Nucleus NGC-4395 using X-Ray spectroscopy
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
2013 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The micro Seyfert galaxy NGC-4395 hosts a supermassive black hole at its center that

actively accrete matter and thus radiates very strongly in the X-ray range. Denoted

the active galactic nucleus this thesis focuses on determining its spin. The spin parameter

corresponds to the angular momentum of the black hole and the properties of the

accretion disk surrounding the black hole.

Our spectrum was obtained from satellite telescope XMM-Newton and was analysed

in the range of

3 to 10 keV using the X-ray spectral fitting software XSPEC with the

standard models provided. A good fit was found, and therefore a good description of the

parameters describing the black hole and its disk. These start values were used for the

far more advance model

KERRCONV*REFLIONX which contains the spin.

Specially noteworthy is the broad and narrow Iron

Kemission lines normally occurring

at

6:4 keV whose form tells which different relativistic or gravitational effects that

affects the emissivity. In our spectrum both the broad and narrow Fe emission lines were

prominent as shown by the significant improvement in

2. Furthermore the reflected

component of our fit completely dominated our spectra and a majority of the emission

originates from the innermost regions of the disk, probably caused by strong gravitational

light bending revealing a closely positioned corona. The high value obtained on the spin

parameter seems to be consistent with the relatively low mass and possibly implies a

coherent accretion during the black holes formation.

Place, publisher, year, edition, pages
2013. , 29 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-129329OAI: oai:DiVA.org:kth-129329DiVA: diva2:651680
Supervisors
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2013-09-26Bibliographically approved

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