A Link Between X-ray Emission Lines and Radio Jets in 4U 1630-47?

Abstract

Recently, Diaz 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 High-Energy Transmission Grating Spectrometer. 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 $\sim 5\times$ brighter radio emission, our Chandra spectra allow us to place an upper limit on the flux in the blueshifted Fe XXVI line that is $\gtrsim 20\times$ weaker than the line observed by Diaz 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 ISM, in which case the X-ray emission lines might be unrelated to the radio emission.

6 pages, 2 figures. Accepted for publication in ApJL. Comments welcome

References in corpus (4)

• The Accretion Disk Wind in the Black Hole GRO J1655-40
• A Magnetized Jet from a Massive Protostar
• Baryons in the relativistic jets of the stellar-mass black hole candidate 4U 1630-47
• The Disk Wind in the Rapidly Spinning Stellar-Mass Black Hole 4U 1630-472 Observed with NuSTAR

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• Dust absorption and scattering in the silicon K-edge
• Dust scattering halo of 4U 1630-47 observed with Chandra and Swift: New constraints on the source distance
• The evolving jet spectrum of the neutron star X-ray binary Aql X-1 in transitional states during its 2016 outburst
• A Delayed Transition to the Hard State for 4U 1630-47 at the End of Its 2010 Outburst
• A Comprehensive Chandra Study of the Disk Wind in the Black Hole Candidate 4U 1630-472
• X-ray polarisation properties of thermal-radiative disc winds in binary systems
• Chandra high-resolution spectra of 4U~1630-47: the disappearance of the wind
• Missing hard states and regular outbursts: the puzzling case of the black hole candidate 4U 1630-472
• AstroSat and Chandra view of the high soft state of 4U 1630-47 (4U 1630-472): evidence of the disk wind and a rapidly spinning black hole
• The jet kinetic power, distance and inclination of GRS 1915+105
• Thermal X-ray emission from a baryonic jet: a self-consistent multicolour spectral model
• Jet-ISM Interactions near the Microquasars GRS 1758-258 and 1E 1740.7-2942
• Origin of Multi-band Emission from the Microquasar Cygnus X--1
• The XMM Newton spectra of the 2012 outburst of the black-hole candidate 4U 1630-47 revisited
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• 20 years of disk winds in 4U 1630-47 -- I. Long-term behavior and influence of hard X-rays
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