A LINK BETWEEN X-RAY EMISSION LINES AND RADIO JETS IN 4U 1630-47?
- Department of Astronomy, Boston University, Boston, MA 02215 (United States)
- Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701 (South Africa)
- Department of Physics, Oxford University, Oxford OX1 3RH (United Kingdom)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
- Max Planck Institute fur Extraterrestriche Physik, D-85748 Garching (Germany)
Recently, Díaz Trigo et al. reported an XMM-Newton detection of relativistically Doppler-shifted emission lines associated with steep-spectrum radio emission in the stellar-mass black hole candidate 4U 1630-47 during its 2012 outburst. They interpreted these lines as indicative of a baryonic jet launched by the accretion disk. Here we present a search for the same lines earlier in the same outburst using high-resolution X-ray spectra from the Chandra HETGS. While our observations (eight months prior to the XMM-Newton campaign) also coincide with detections of steep spectrum radio emission by the Australia Telescope Compact Array, we find no evidence for any relativistic X-ray emission lines. Indeed, despite ∼5 × brighter radio emission, our Chandra spectra allow us to place an upper limit on the flux in the blueshifted Fe XXVI line that is ≳ 20 × weaker than the line observed by Díaz Trigo et al. We explore several scenarios that could explain our differing results, including variations in the geometry of the jet or a mass-loading process or jet baryon content that evolves with the accretion state of the black hole. We also consider the possibility that the radio emission arises in an interaction between a jet and the nearby interstellar medium, in which case the X-ray emission lines might be unrelated to the radio emission.
- OSTI ID:
- 22365976
- Journal Information:
- Astrophysical Journal Letters, Vol. 784, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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