English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the results obtained from detailed timing and spectral studies ofa black hole candidate MAXI~J1813-095 using {\it Swift}, {\it NICER}, and {\itNuSTAR} observations during its 2018 outburst. The timing behaviour of thesource is mainly studied by using {\it NICER} light curves in a $0.5-10$ keVrange. We did not find any signature of quasi-periodic oscillations in thepower density spectra of the source. We carry out spectral analysis with acombined disk blackbody \& power-law model, and a physical two-componentadvective flow (TCAF) model. From the combined {\tt disk blackbody} \& {\ttpower-law} model, we extracted thermal and non-thermal fluxes, photon index,and inner disk temperature. We also find evidence for weak reflection in thespectra. We have tested the physical TCAF model on a broadband spectrum from{\it NuSTAR} and {\it Swift}/XRT. The parameters like mass accretion rates, thesize of the Compton clouds and the shock strength are extracted. Our resultshows that the source remained in the hard state during the entire outburstwhich indicates a `failed' outburst. We estimate the mass of the black hole as$7.4 \pm 1.5$ $M_{\odot}$ from the spectral study with the TCAF model. We use{\tt LAOR} model for the Fe K$\alpha$ line emission. From this, the spinparameter of the black hole is estimated as $a^* > 0.76$. The inclination angleof the system is estimated to be in the range of $28^{\circ} - 45^{\circ}$ fromthe reflection model. We estimate the source distance to be $\sim 6$ kpc.

Accretion Properties of MAXI J1813-095 during its Failed Outburst in 2018