Detection of X-ray emission from gravitationally lensed submillimeter sources in the field of abell 370 http://iopscience.iop.org/article/10.1086/317282/pdf

M. W. Bautz, M. R. Malm, F. K. Baganoff, G. R. Ricker, C. R. Canizares, W. N. Brandt, A. E. Hornschemeier, G. P. Garmire

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Abstract

We report the detection by Chandra of SMM J02399-0134 and SMM J02399-0136, two distant (z = 1.06 and z = 2.81, respectively) submillimeter sources gravitationally magnified by the galaxy cluster Abell 370. These are high-significance (<7σ) X-ray detections of the high-redshift submillimeter source population. The Xray positions are coincident with the optical positions to within 1″. The X-ray spectra, while of low signal-tonoise ratio, are quite hard. Absorbed power-law models with fixed photon indices of Γ = 2.0 imply local absorbing columns greater than 2×10-3 cm-2 and unabsorbed luminosities greater than 1044 ergs s21 in both sources. These results imply that nuclear activity is responsible for the bulk of the luminosity in SMM J02399-0134 and for at least 20% of the luminosity of SMM J02399-0136, consistent with previous optical observations. We also place an upper limit on the X-ray flux of a third submillimeter source, SMM J02400-0134. Considered together with previously published Chandra upper limits on the X-ray flux from submillimeter sources, our results imply that 20+30-16% of submillimeter sources exhibit X-ray emission from active galactic nuclei (with 90% con- 216 fidence), consistent with expectations of their contribution to the diffuse X-ray background.

Original languageEnglish (US)
Pages (from-to)L119-L123
JournalAstrophysical Journal Letters
Volume543
Issue number2
StatePublished - Nov 10 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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