Detection of an iron emission feature from the lensed broad absorption line QSO H1413+117 at z = 2.56

T. Oshima, K. Mitsuda, R. Fujimoto, N. Iyomoto, K. Futamoto, M. Hattori, N. Ota, K. Mori, Y. Ikebe, J. M. Miralles, J. P. Kneib

研究成果: Article査読

25 被引用数 (Scopus)

抄録

We present the X-ray energy spectrum of the lensed broad absorption line QSO H1413+117 (the Cloverleaf) at z = 2.56 observed with the Chandra X-ray observatory. We detected 293 photons in a 40 ks Advanced CCD Imaging Spectrometer (ACIS-S) observation. The X-ray image consists of four lensed image components, thus the photons are from the lensed QSO itself. The overall spectrum can be described with a power-law function heavily absorbed by neutral matter at a redshift consistent with the QSO redshift. This supports the idea that intrinsic absorption is significant for BAL QSOs. The spectral fit significantly (99% confidence) improves when we include an emission line. The centroid energy and intrinsic width (Gaussian σ) of the line are 6.21 ± 0.16 keV and 220+270-130 eV (90% errors), respectively, in the QSO rest frame, assuming the absorbed power law as the continuum. The equivalent width of the line in the QSO rest frame is 960+1400-480 eV. We suggest that the large equivalent width, the centroid energy, and the line broadness can be explained by iron K emission arising from X-ray reprocessing in the BAL flow, assuming it has a conical thin-sheet structure.

本文言語English
ページ(範囲)L103-L106
ジャーナルAstrophysical Journal
563
2 PART 2
DOI
出版ステータスPublished - 2001 12 20

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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