Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1 - INSPIRE

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Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1

Jun 20, 2022

51 pages

Published in:

Science 378 (2022) 6620, add5399

Published: Nov 3, 2022

e-Print:

2206.09972 [astro-ph.HE]

DOI:

10.1126/science.add5399

View in:

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Abstract: (American Association for the Advancement of Science)

A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto a black hole, which heats the gas sufficiently to emit x-rays. We report a polarimetric observation of the XRB Cygnus X-1 using the Imaging X-ray Polarimetry Explorer. The electric field position angle aligns with the outflowing jet, indicating that the jet is launched from the inner x-ray–emitting region. The polarization degree is 4.01 ± 0.20% at 2 to 8 kiloelectronvolts, implying that the accretion disk is viewed closer to edge-on than the binary orbit. These observations reveal that hot x-ray–emitting plasma is spatially extended in a plane perpendicular to, not parallel to, the jet axis.

Note:

51 pages, 15 figures, 5 tables

References(69)

Figures(16)

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