Oral Presentation

ALMA detection of parsec-scale blobs at the head of kiloparsec-scale jet in the nearby Seyfert galaxy NGC 1068

Author(s): Tomonari Michiyama (Osaka University), Yoshiyuki Inoue (Osaka University), Akihiro Doi (ISAS/JAXA), Dmitry Khangulyan (Rikkyo University)

Presenter: Tomonari Michiyama (Osaka University)

We report ALMA 100 GHz continuum observations at 0.05" (4 pc) resolution of the kiloparsec-scale jet seen in the nearby Seyfert galaxy NGC 1068. ALMA detected parsec-scale blobs at the head of the jet. According to the radio flux (0.8mJy), the spectral index (0.5), and the size (12 pc), a strongly amplified magnetic field (B~230 G) is confirmed, which indicates that the blobs are likely efficient sites of cosmic-ray acceleration. The estimated cosmic-ray power by the jet may exceed the limit set by the star formation activity in this galaxy. This result suggests that even modest-power jets can increase the galactic cosmic-ray content while propagating through the galactic bulge. The results are published by Michiyama et al. 2022 (The Astrophysical Journal Letters, Volume 936, Issue 1, id.L1, 7 pp.)