APA
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Suzuki, H., Tsuji, N., Kanemaru, Y., Shidatsu, M., Olivera-Nieto, L., Safi-Harb, S., … Ueda, Y. (2024). Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM. Astrophysical Journal Letters.
Chicago/Turabian
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Suzuki, Hiromasa, Naomi Tsuji, Y. Kanemaru, M. Shidatsu, L. Olivera-Nieto, S. Safi-Harb, S. Kimura, et al. “Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM.” Astrophysical Journal Letters (2024).
MLA
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Suzuki, Hiromasa, et al. “Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM.” Astrophysical Journal Letters, 2024.
BibTeX Click to copy
@article{hiromasa2024a,
title = {Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM},
year = {2024},
journal = {Astrophysical Journal Letters},
author = {Suzuki, Hiromasa and Tsuji, Naomi and Kanemaru, Y. and Shidatsu, M. and Olivera-Nieto, L. and Safi-Harb, S. and Kimura, S. and de la Fuente, E. and Casanova, S. and Mori, K. and Wang, Xiaojie and Kato, Sei and Tateishi, D. and Uchiyama, H. and Tanaka, Takaaki and Uchida, H. and Inoue, S. and Huang, Dezhi and Lemoine-Goumard, M. and Miura, Daiki and Ogawa, S. and Kobayashi, S. and Done, C. and Parra, M. and Trigo, M. Díaz and Muñoz-Darias, T. and Padilla, M. Armas and Tomaru, R. and Ueda, Y.}
}
A recent report on the detection of very-high-energy gamma rays from V4641 Sagittarii (V4641 Sgr) up to ≈0.8 PeV has made it the second confirmed “PeVatron” microquasar. Here we report on the observation of V4641 Sgr with X-Ray Imaging and Spectroscopy Mission (XRISM) in 2024 September. Thanks to the large field of view and low background, the CCD imager Xtend successfully detected for the first time X-ray extended emission around V4641 Sgr with a significance of ≳4.5σ and >10σ based on our imaging and spectral analysis, respectively. The spatial extent is estimated to have a radius of 7′ ± 3′ (13 ± 5 pc at a distance of 6.2 kpc) assuming a Gaussian-like radial distribution, which suggests that the particle acceleration site is within ~10 pc of the microquasar. If the X-ray morphology traces the diffusion of accelerated electrons, this spatial extent can be explained by either an enhanced magnetic field (∼80 μG) or a suppressed diffusion coefficient (∼1027 cm2 s−1 at 100 TeV). The integrated X-ray flux, (4–6) × 10−12 erg s−1 cm−2 (2–10 keV), would require a magnetic field strength higher than the Galactic mean (≳8 μG) if the diffuse X-ray emission originates from synchrotron radiation and the gamma-ray emission is predominantly hadronic. If the X-rays are of thermal origin, the measured extension, temperature, and plasma density can be explained by a jet with a luminosity of ∼2 × 1039 erg s−1, which is comparable to the Eddington luminosity of this system.