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

Abstract

We present Atacama Large Millimeter/submillimeter Array observations at $\approx 100$ GHz with $0.05$ arcsec (3 pc) resolution of the kiloparsec-scale jet seen in the nearby Seyfert galaxy NGC 1068, and we report the presence of parsec-scale blobs at the head of the jet. The combination of the detected radio flux ($\approx 0.8$ mJy), spectral index ($\approx 0.5$), and the blob size ($\approx 10$ pc) suggests a strong magnetic field of $B\approx 240\mu$G. Such a strong magnetic field most likely implies magnetic field amplification by streaming cosmic rays. 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.

9 pages, 3 figures, accepted for publication in ApJL

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Cited by in corpus (5)

• Revealing the Production Mechanism of High-Energy Neutrinos from NGC 1068
• Gamma-Ray Emission in the Seyfert Galaxy NGC 4151: Investigating the Role of Jet and Coronal Activities
• On the possible jet contribution to the $\gamma$-ray luminosity in NGC 1068
• The Centimeter to Submillimeter Broad Band Radio Spectrum of the Central Compact Component in A Nearby Type-II Seyfert Galaxy NGC 1068
• Measuring 60-pc-scale Star Formation Rate of the Nearby Seyfert Galaxy NGC 1068 with ALMA, HST, VLT/MUSE, and VLA