Estimating the black hole mass of NGC1313 X-1 based on the spectral and timing properties

Huang, Chang‐Yin; Chang-Yin,

doi:10.48550/arxiv.1901.01480

2019

DOI: 10.48550/arxiv.1901.01480

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Estimating the black hole mass of NGC1313 X-1 based on the spectral and timing properties

Chang‐Yin Huang¹,

Chang-Yin Chang-Yin²

Abstract: The discovery of 3:2 quasi-periodic oscillations (QPOs) in the ultraluminous X-ray source NGC 1313 X-1 suggests it harbors an intermediate-mass black hole (IMBH). We test this numerically by modelling the 3:2 QPOs and the associated X-ray spectrum based on the epicyclic resonance model and a disk-corona model with large-scale magnetic fields generated by the Cosmic Battery mechanism. The combined QPO-frequency and spectral fitting indicates that the BH mass ranges from 2524M⊙ to 6811M⊙ confirming its IMBH natu… Show more

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2023

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Unveiling the accretion scenario of BH-ULXs using XMM–Newton observations

Majumder,

Das,

Agrawal

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We present a comprehensive spectro-temporal analysis of five ultraluminous X-ray sources (ULXs) with central object likely being a black hole, using archival XMM-Newton observations. These sources, namely NGC1313 X−1, NGC5408 X-1, NGC6946 X−1, M82 X−1 and IC342 X−1, reveal short-term variability with fractional variance of 1.42$-27.28\%$ and exhibit Quasi-periodic Oscillations (QPOs) with frequency νQPO∼8 −667 mHz. Long-term evolution of ULXs energy spectra (0.3−10 keV; excluding M82 X−1) are described satisfactorily with a model combination that comprises a thermal Comptonization component (nthComp, yielding Γnth∼1.48 −2.65, kTe∼1.62 −3.76 keV, τ∼8 −20, y-par∼1.16 −6.24) along with a standard disc component (diskbb, kTin∼0.16 −0.54 keV). We find that these ULXs generally demonstrate anti-correlation between disc luminosity and inner disc temperature as Ldisc∝$T_{\rm in}^\alpha$, where α=−3.58 ±0.04 for NGC1313 X−1 and IC342 X−1, α=−8.93 ±0.11 for NGC6946 X−1, and α=−10.31 ±0.10 for NGC5408 X−1. We also obtain a linear correlation between bolometric luminosity Lbol and Γnth that indicates spectral softening of the sources when Lbol increases. We observe that in presence of QPO, Comptonized seed photon fraction varies in between $\sim 5-20\%$, while the Comptonized flux contribution (50$-90\%$) dominates over disc flux. Utilizing νQPO and Lbol, we constrain ULXs mass by varying their spin (ak) and accretion rate ($\dot{m}$). We find that NGC6946 X−1 and NGC5408 X−1 seem to accrete at sub-Eddington accretion rate provided their central sources are rapidly rotating, whereas IC342 X−1 and NGC1313 X−1 can accrete in sub/super-Eddington limit irrespective to their spin values.

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Unveiling the accretion scenario of BH-ULXs using XMM–Newton observations

Majumder,

Das,

Agrawal

et al. 2023

Monthly Notices of the Royal Astronomical Society

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show abstract

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Estimating the black hole mass of NGC1313 X-1 based on the spectral and timing properties

Cited by 1 publication

References 41 publications

Unveiling the accretion scenario of BH-ULXs using XMM–Newton observations

Unveiling the accretion scenario of BH-ULXs using XMM–Newton observations

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