Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-01-23
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
8 pages, 5 figures
Scientific paper
The RXTE and Swift observations on the 2009 outburst from a newly discovered transient and black-hole candidate XTE J1652$-$453 are analyzed. The source was observed by RXTE to behave a sequence of spectral states that are typical to the black hole XRBs. During the first 7 observations, the source is diagnosed to stay in a high/soft state, from the spectrum dominated by soft thermal component which contributes an average of $\sim$ 85% to the X-ray flux at 2-20keV, and from the hardness $\sim$ 0.1 showing up in the hardness-intensity diagram (HID). For the last 20 observations the spectral state is classified as {\sl low/hard} according to an average hardness of $\sim$ 0.8 and a balance between the thermal and the non-thermal components: a power-law component takes ${\geq}80%$ of total 2-20keV flux. Located in between is an {\sl intermediate} state that the source might have experienced. The usual relationship between rms and hardness presents in HRD as well. Throughout the outburst no QPOs are found in XTE J1652$-$453.
Ding Guoqiang
Han Peng
Lu Yu
Qu Jinlu
Song Liming
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