Next Article in Journal
Using the Outskirts of Galaxy Clusters to Determine Their Mass Accretion Rate
Next Article in Special Issue
A New Statistical Approach to the Optical Spectral Variability in Blazars
Previous Article in Journal
On Effective Degrees of Freedom in the Early Universe
Previous Article in Special Issue
Emission Knots and Polarization Swings of Swinging Jets
Article Menu

Export Article

Open AccessArticle

Conical Stream of the Two-Sided Jets in NGC 4261 over the Range of 103–109 Schwarzschild Radii

Department of Space and Astronautical Science, The Graduate University for Advanced Studies, 3-1-1 Yoshinodai, Chuou-ku, Sagamihara, Kanagawa 252-0222, Japan
The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuou-ku, Sagamihara, Kanagawa 252-5210, Japan
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Institute of Astronomy & Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(4), 80;
Received: 6 September 2016 / Revised: 23 November 2016 / Accepted: 14 December 2016 / Published: 20 December 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
PDF [1175 KB, uploaded 20 December 2016]


We report the jet width profile of of the nearby ( 30 Mpc ) AGN NGC 4261 for both the approaching jet and the counter jet at radial distances ranging from 10 3 10 9 Schwarzschild radius ( R S ) from the central engine. Our Very Large Array (VLA) and Very Long Baseline Array (VLBA) observations reveal that the jets maintain a conical structure on both sides over the range 10 3 10 9 R S without any structural transition (i.e., parabolic to conical) like in the approaching jet in M87. Thus, NGC 4261 will provide a unique opportunity to examine the conical jet hypothesis in blazars, while it may require some additional consideration on the acceleration and collimation process in AGN jets. View Full-Text
Keywords: AGN jet; jet structure; VLBI observations AGN jet; jet structure; VLBI observations

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Nakahara, S.; Doi, A.; Murata, Y.; Hada, K.; Nakamura, M.; Asada, K. Conical Stream of the Two-Sided Jets in NGC 4261 over the Range of 103–109 Schwarzschild Radii. Galaxies 2016, 4, 80.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Galaxies EISSN 2075-4434 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top