Energy estimation of high-energy particles associated with the SS 433/W 50 system through radio observation at 1.4 GHz

Author:

Sakemi Haruka1ORCID,Omae Rikuto1ORCID,Ohmura Takumi1ORCID,Machida Mami2ORCID

Affiliation:

1. Graduate School of Science, Kyushu University, 744 Motooka Nishi-ku, Fukuoka, Fukuoka 819-0395, Japan

2. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

Abstract

Abstract The radio nebula W 50 is a unique object interacting with the jets of the microquasar SS 433. The SS 433/W 50 system is a good target for investigating the energy of cosmic-ray particles accelerated by galactic jets. We report observations of the radio nebula W 50 conducted with the National Science Foundation’s Karl G. Jansky Very Large Array in the L band (1.0–2.0 GHz). We investigate the secular change of W 50 on the basis of the observations in 1984, 1996, and 2017, and find that most of its structures were stable for 33 yr. We revise the upper-limit velocity of the eastern terminal filament by half to 0.023 c, assuming a distance of 5.5 kpc. We also analyze observational data from the Arecibo Observatory 305 m telescope and identify the H i cavity around W 50 in the velocity range 33.77–55.85 km s−1. From this result, we estimate the maximum energy of the cosmic-ray protons accelerated by the jet terminal region to be above 1015.5 eV. We also use the luminosity of the gamma-rays in the range 0.5–10 GeV to estimate the total energy of accelerated protons below 5.2 × 1048 erg.

Funder

JSPS

Astronomy Data Center

National Astronomical Observatory of Japan

Japan Foundation for Promotion of Astronomy

National Science Foundation

Associated Universities, Inc.

Chandra X-ray Science Center

High Energy Astrophysics Science Archive Center

Space Telescope Science Institute

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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