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.

arXiv comment9 pages, 3 figures, accepted for publication in ApJL

References in corpus (25)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• The Interstellar Environment of our Galaxy
• The Origin of Galactic Cosmic Rays
• Molecular line emission in NGC1068 imaged with ALMA. I An AGN-driven outflow in the dense molecular gas
• The Astrophysics of Ultrahigh Energy Cosmic Rays
• Time-integrated Neutrino Source Searches with 10 years of IceCube Data
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• GeV Observations of Star-forming Galaxies with \textit{Fermi} LAT
• Radiative Efficiency and Content of Extragalactic Radio Sources: Toward a Universal Scaling Relation Between Jet Power and Radio Power
• A dark jet dominates the power output of the stellar black hole Cygnus X-1
• Cosmic ray acceleration and escape from supernova remnants
• Distances to PHANGS Galaxies: New Tip of the Red Giant Branch Measurements and Adopted Distances
• But What About... Cosmic Rays, Magnetic Fields, Conduction, & Viscosity in Galaxy Formation
• On the Origin of High Energy Neutrinos from NGC 1068: The Role of Non-Thermal Coronal Activity
• Testing Physical Models for Cosmic Ray Transport Coefficients on Galactic Scales: Self-Confinement and Extrinsic Turbulence at GeV Energies
• The $\gamma$-ray Emission of Star-Forming Galaxies
• Time-resolved hadronic particle acceleration in the recurrent Nova RS Ophiuchi
• Seyfert 2 galaxies in the GeV band: jets and starburst
• 2D mapping of young stars in the inner 180 pc of NGC 1068: correlation with molecular gas ring and stellar kinematics
• High Energy Emission from the Starburst Galaxy NGC253
• Search for gamma-ray emission from magnetars with the Fermi Large Area Telescope
• The Radio-Gamma Correlation In Starburst Galaxies
• Evidence that the maximum electron energy in hotspots of FR II galaxies is not determined by synchrotron cooling

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