11 citations · 11 across the 1 of their papers we have counts for
6 papers
Inner Disc Obscuration in GRS 1915+105 Based on Relativistic Slim Disc Model
K. Vierdayanti, A. Sadowski, S. Mineshige +1
We study the observational signatures of the relativistic slim disc of 10 M_sun black hole, in a wide range of mass accretion rate, mdot, dimensionless spin parameter, a_ast, and v…
Can Self Organized Critical Accretion Disks Generate a Log-normal Emission Variability in AGN?
Chatief Kunjaya, Putra Mahasena, Kiki Vierdayanti +1
Active Galactic Nuclei (AGN), such as Seyfert galaxies, quasars, etc., show light variations in all wavelength bands, with various amplitude and in many time scales. The variations…
Probing the Peculiar Behavior of GRS 1915+105 at Near-Eddington Luminosity
K. Vierdayanti, S. Mineshige, Y. Ueda
To understand the nature of supercritical accretion, we systematically analyze the {\it RXTE}/PCA data of GRS 1915+105 in its quasi-steady states, by choosing data with small varia…
X-ray spectral variability in the ultraluminous X-ray source Holmberg IX X-1
K. Vierdayanti, C. Done, T. R. Roberts +1
We use XMM-Newton and Swift data to study spectral variability in the ultraluminous X-ray source (ULX), Holmberg IX X-1. The source luminosity varies by a factor 3-4, giving rise t…
On Black Hole Mass Estimation from X-ray Spectra of Ultraluminous X-ray Sources
Kiki Vierdayanti, Ken-ya Watarai, Shin Mineshige
We propose a methodology to derive a black-hole mass for super-critical accretion flow. Here, we use the extended disk blackbody (extended DBB) model, a fitting model in which the…
Do Ultraluminous X-ray Sources Really Contain Intermediate-mass Black Holes?
Kiki Vierdayanti, Shin Mineshige, Ken Ebisawa +1
An open question remains whether Ultraluminous X-ray Sources (ULXs) really contain intermediate-mass black holes (IMBHs). We carefully investigated the XMM-Newton EPIC spectra of t…