Detection of X-ray emission from gravitationally lensed submillimeter sources in the field of Abell 370

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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51 Scopus citations


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 (>7 σ) X-ray detections of the high-redshift submillimeter source population. The X-ray positions are coincident with the optical positions to within 1″. The X-ray spectra, while of low signal-to-noise ratio, are quite hard. Absorbed power-law models with fixed photon indices of Γ = 2.0 imply local absorbing columns greater than 2 × 1023 cm-2 and unabsorbed luminosities greater than 1044 ergs s-1 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% confidence), consistent with expectations of their contribution to the diffuse X-ray background.

Original languageEnglish (US)
Pages (from-to)L119-L123
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - Nov 10 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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