2018A&A...616A.188K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:17:31

2018A&A...616A.188K - Astronomy and Astrophysics, volume 616A, 188-188 (2018/8-1)

The limb-brightened jet of M87 down to the 7 Schwarzschild radii scale.

KIM J.-Y., KRICHBAUM T.P., LU R.-S., ROS E., BACH U., BREMER M., DE VICENTE P., LINDQVIST M. and ZENSUS J.A.

Abstract (from CDS):

Messier 87 (M 87) is one of the nearest radio galaxies with a prominent jet extending from sub-pc to kpc scales. Because of its proximity and the large mass of its central black hole (BH), it is one of the best radio sources for the study of jet formation. We study the physical conditions near the jet base at projected separations from the BH of ∼7-100 Schwarzschild radii (Rsch). Global mm-VLBI Array (GMVA) observations at 86GHz (λ=3.5mm) provide an angular resolution of ∼50µas, which corresponds to a spatial resolution of only 7Rsch and reach the small spatial scale. We use five GMVA data sets of M 87 obtained from 2004 to 2015 and present new high angular resolution VLBI maps at 86GHz. In particular, we focus on the analysis of the brightness temperature, the jet ridge lines, and the ratio of jet to counter-jet. The imaging reveals a parabolically expanding limb-brightened jet which emanates from a resolved VLBI core of ~(8-13)Rsch in size. The observed brightness temperature of the core at any epoch is ~(1-3)x1010K, which is below the equipartition brightness temperature and suggests magnetic energy dominance at the jet base. We estimate the diameter of the jet at its base to be ∼5Rsch assuming a self-similar jet structure. This suggests that the sheath of the jet may be anchored in the very inner portion of the accretion disk. The image stacking reveals faint emission at the center of the edge-brightened jet on sub-pc scales. We discuss its physical implication within the context of the spine-sheath structure of the jet.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: active - galaxies: jets - galaxies: individual: M 87 - techniques: interferometric

VizieR on-line data: <Available at CDS (J/A+A/616/A188): list.dat fits/*>

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3545 3
2 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5320 1
3 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6213 3
4 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2113 2

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:17:31

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