Discovery of off-axis jet structure of TeV blazar Mrk 501 with mm-VLBI

Abstract

High-resolution millimeter wave very-long-baseline interferometry (mm-VLBI) is an ideal tool for probing the structure at the base of extragalactic jets in detail. The TeV blazar Mrk 501 is one of the best targets among BL Lac objects for studying the nature of off-axis jet structures because it shows different jet position angles at different scales. The aim of this study is to investigate the properties of the off-axis jet structure through high-resolution mm-VLBI images at the jet base and physical parameters such as kinematics, flux densities, and spectral indices. We performed Very Long Baseline Array (VLBA) observations over six epochs from 2012 February to 2013 February at 43 GHz. Quasi-simultaneous Global Millimeter VLBI Array (GMVA) observations at 86 GHz were performed in May 2012. We discover a new jet component at the northeast direction from the core in all the images at 43 and 86 GHz. The new component shows the off-axis location from the persistent jet extending to the southeast. The 43 GHz images reveal that the scattering of the positions of the NE component is within ~0.2 mas. The 86 GHz data reveals a jet component located 0.75 mas southeast of the radio core. We also discuss the spectral indices between 43 and 86 GHz, where the northeast component has steeper spectral index and the southeast component has comparable or flatter index than the radio core does.

11 pages, 5 figures, accepted for publication in Astronomy and Astrophysics

References in corpus (18)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• MOJAVE. X. Parsec-Scale Jet Orientation Variations and Superluminal Motion in AGN
• Stability of Relativistic Jets from Rotating, Accreting Black Holes via Fully Three-Dimensional Magnetohydrodynamic Simulations
• A Global 86GHz VLBI Survey of Compact Radio Sources
• MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. XI. Spectral distributions
• MOJAVE XII: Acceleration and Collimation of Blazar Jets on Parsec Scales
• Superluminal non-ballistic jet swing in the quasar NRAO 150 revealed by mm-VLBI
• Studies of the Jet in BL Lacertae I. Recollimation Shock and Moving Emission Features
• The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds
• Long-term Monitoring on Mrk 501 for Its VHE gamma Emission and a Flare in October 2011
• Connection between inner jet kinematics and broadband flux variability in the BL Lac object S5 0716+714
• Fine-scale structure of the quasar 3C 279 Measured with 1.3 mm very long baseline interferometry
• Significant Limb-Brightening in the Inner Parsec of Markarian 501
• An Extremely Curved Relativistic Jet in PKS 2136+141
• Evidence of internal rotation and a helical magnetic field in the jet of the quasar NRAO150
• The TeV blazar Markarian 421 at the highest spatial resolution
• Discovery of a wandering radio jet base after a large X-ray flare in the blazar Markarian 421
• Probing Precise Location of Radio Core in TeV Blazar Mrk 501 with VERA at 43 GHz

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• Ejection of Double knots from the radio core of PKS 1510--089 during the strong gamma-ray flares in 2015
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• Long-term multi-band photometric monitoring of Mrk 501
• Unveiling the Complex Jet Dynamics in the Blazar 2021+317 through Multi-Epoch VLBI Observations