RXTE Observations of 1A 1744-361: Correlated Spectral and Timing Behavior
Abstract
We analyze Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) data of the transient low mass X-ray binary (LMXB) system 1A 1744-361. We explore the X-ray intensity and spectral evolution of the source, perform timing analysis, and find that 1A 1744-361 shows `atoll' behavior during the outbursts. The color-color diagram indicates that this LMXB was observed in a low intensity spectrally hard (low-hard) state and in a high intensity `banana' state. The low-hard state shows a horizontal pattern in the color-color diagram, and the previously reported `dipper QPO' appears only during this state. We also perform energy spectral analyses, and report the first detection of broad iron emission line and iron absorption edge from 1A 1744-361.
Keywords
Cite
@article{arxiv.astro-ph/0607475,
title = {RXTE Observations of 1A 1744-361: Correlated Spectral and Timing Behavior},
author = {Sudip Bhattacharyya and Tod E. Strohmayer and Jean H. Swank and Craig B. Markwardt},
journal= {arXiv preprint arXiv:astro-ph/0607475},
year = {2011}
}
Comments
20 pages, 4 tables, 4 figures, accepted for publication in ApJ