Accretion properties of MAXI J1813-095 during its failed outburst in 2018

来源 :天文和天体物理学研究 | 被引量 : 0次 | 上传用户:mawenxing8155
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI J1813-095 using Swift,NICER,and NuSTAR observations during its 2018 outburst.The timing behavior of the source is mainly studied by examining NICER light curves in the 0.5-10 keV range.We did not find any signature of quasi-periodic oscillations in the power density spectra of the source.We carry out spectral analysis with a combined disk blackbody & power law model,and physical two-component advective flow (TCAF) model.From the combined disk blackbody & power-law model,we extracted thermal and non-thermal fluxes,photon index and inner disk temperature.We also find evidence for weak reflection in the spectra.We have tested the physical TCAF model on a broadband spectrum from NuSTAR and Swift/XRT.The parameters like mass accretion rates,the size of Compton clouds and the shock strength are extracted.Our result affirms that the source remained in the hard state during the entire outburst which indicates a \'failed\'outburst.We estimate the mass of the black hole as 7.4 ± 1.5 M☉ from the spectral study with the TCAF model.We apply the LAOR model for the Fe Kα line emission.From this,the spin parameter of the black hole is ascertained as a* > 0.76.The inclination angle of the system is estimated to be in the range of 28°-45° from the reflection model.We find the source distance to be ~ 6 kpc.
其他文献
PSR J1946 + 3417 is a millisecond pulsar (MSP) with a spin period P ≈ 3.17 ms.Harbored in a binary with an orbital period Pb ≈ 27 days,the MSP is accompanied by a white dwarf (WD).The masses of the MSP and the WD were determined to be 1.83 M⊙ and 0.266 M⊙
Spectrum denoising is an important procedure for large-scale spectroscopical surveys.This work proposes a novel stellar spectrum denoising method based on deep Bayesian modeling.The construction of our model includes a prior distribution for each stellar
Ellerman bombs (EBs) and ultraviolet (UV) bursts are common brightening phenomena,which are usually generated in the low solar atmosphere of emerging flux regions.In this paper,we have investigated the emergence of an initial un-twisted magnetic flux rope
Flat-field reflects the non-uniformity of the photometric response at the focal plane of an instrument,which uses digital image sensors,such as Charge Coupled Device (CCD) and Complementary Metal-Oxide-Semiconductor (CMOS).This non-uniformity must be corr
PolarLight is a space-borne X-ray polarimeter that measures the X-ray polarization via electron tracking in an ionization chamber.It is a collimated instrument and thus suffers from the background on the whole detector plane.The majority of background eve
This paper presents the results of Hα imaging of 169 galaxies randomly selected from the α.40-SDSS catalog.The sample has excluded all low surface brightness galaxies (LSBGs) whose central surface brightness in B band (μ0(B)) fainter than 22.5 mag arcsec-
The lower solar atmosphere is a gravitationally stratified layer of partially ionized plasma.We calculate the electric resistivity in the solar photosphere and chromosphere,which is the key parameter that controls the rate of magnetic reconnection in a Sw
Multi-band photometry and light curve analysis for two newly recognized contact binary systems,TYC 6995-813-1 and NSVS 13602901,are presented.Both were found to be of extreme low mass ratios 0.11 and 0.17,respectively.The secondary components of both syst
Forbush decrease (FD),discovered by Scott E.Forbush about 80 years ago,is referred to as the non-repetitive short-term depression in Galactic cosmic ray (GCR) flux,presumed to be associated with large-scale perturbations in solar wind and interplanetary m
Using data-driven algorithms to accurately forecast solar flares requires reliable data sets.The solar flare dataset is composed of many non-flaring samples with a small percentage of flaring samples.This is called the class imbalance problem in data mini