• NIRMAL IYER

Articles written in Journal of Astrophysics and Astronomy

• Observational aspects of outbursting black hole sources: Evolution of spectro-temporal features and X-ray variability

We report on our attempt to understand the outbursting profile of Galactic Black Hole sources, keeping in mind the evolution of temporal and spectral features during the outburst. We present results of evolution of quasi-periodic oscillations, spectral states and possible connection with jet ejections during the out burst phase. Further,we attempt to connect the observed X-ray variabilities (i.e., ‘class’/‘structured’ variabilities, similar to GRS 1915$+$105) with spectral states of black hole sources. Towards these studies, we consider three black hole sources that have undergone single (XTE J1859$+$226), a few (IGR J17091$-$3624) and many (GX 339-4) outbursts since the start of $RXTE$ era. Finally, we model the broadband energy spectra (3–150 keV) of different spectral states using $RXTE$ and $NuSTAR$ observations. Results are discussed in the context oftwo-component advective flow model, while constraining the mass of the three black hole sources.

• # Journal of Astrophysics and Astronomy

Volume 41, 2020
All articles
Continuous Article Publishing mode

• # Continuous Article Publication

Posted on January 27, 2016

Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019