RXTE Observations of 1A 1744-361: Correlated Spectral and Timing Behavior

Details RXTE Observations of 1A 1744-361: Correlated Spectral and Timing Behavior RXTE Observations of 1A 1744-361: Correlated Spectral and Timing Behavior

2006-07-20

arxiv.org/abs/astro-ph/0607475v1

Astrophys.J.652:603-609,2006

Astronomy and Astrophysics

Astrophysics

20 pages, 4 tables, 4 figures, accepted for publication in ApJ

Scientific paper

10.1086/507786

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.

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