CLEAN imaging systematics of M87 radio jet

Author:

Pashchenko I N12ORCID,Kravchenko E V12ORCID,Nokhrina E E2ORCID,Nikonov A S13ORCID

Affiliation:

1. Lebedev Physical Institute , Leninsky prosp. 53, 119991 Moscow, Russia

2. Moscow Institute of Physics and Technology , Dolgoprudny, Institutsky per., 9, 141700 Moscow region, Russia

3. Max-Planck-Institut für Radioastronomie , Auf dem Hügel 69, D-53121 Bonn, Germany

Abstract

ABSTRACT The spectral index images of the jet in the nearby radio galaxy M87 have previously been shown with Very Long Baseline Interferometric arrays at 2–43 GHz. They exhibit flattening of the spectra at a location of inner (central) spine and towards outer ridges. This could imply optical depth effects, lower energy cut-off, or stratification of the emitting particles energy distribution. In this paper, we employ simulations of multifrequency VLBI observations of M87 radio jet with various model brightness distributions. CLEAN deconvolution errors produce significant features in the observed images. For intensity images, they result in the appearance of the inner ridge line in the intrinsically edge brightened jet models. For spectral index images, they flatten the spectra in a series of stripes along the jet. Another bias encountered in our simulations is steepening of the spectra in a low surface brightness jet regions. These types of the imaging artefacts do not depend on the model considered. We propose a method for the compensation of the systematics using only the observed data.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Identifying synergies between VLBI and STIX imaging;Astronomy & Astrophysics;2024-04

2. On the M87 jet structure near the central engine;Monthly Notices of the Royal Astronomical Society;2024-02-13

3. Properties of the jet in M87 revealed by its helical structure imaged with the VLBA at 8 and 15 GHz;Monthly Notices of the Royal Astronomical Society;2023-10-09

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