Mapping the Distribution of the Magnetic Field Strength along the NGC 315 Jet

被引：2

作者：

Kino, Motoki ^{[1
,2
]}

Ro, Hyunwook ^{[3
]}

Takahashi, Masaaki ^{[4
]}

Kawashima, Tomohisa ^{[5
]}

Park, Jongho ^{[6
,7
]}

Hada, Kazuhiro ^{[8
,9
,10
]}

Cui, Yuzhu ^{[11
]}

机构：

[1] Kogakuin Univ Technol & Engn, Acad Support Ctr, 2665-1 Nakano Machi, Hachioji, Tokyo 1920015, Japan

[2] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[3] Korea Astron & Space Sci Inst, Daedeokdae Ro 776, Daejeon 34055, South Korea

[4] Aichi Univ Educ, Dept Phys & Astron, Kariya, Aichi 4488542, Japan

[5] Univ Tokyo, Inst Cosm Ray Res, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778582, Japan

[6] Kyung Hee Univ, Sch Space Res, 1732 Deogyeong Daero, Yongin 17104, Gyeonggi Do, South Korea

[7] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan

[8] Nagoya City Univ, Grad Sch Sci, Yamanohata 1, Mizuho Cho, Mizuho Ku, Nagoya, Aichi 4678501, Japan

[9] Natl Astron Observ Japan, Mizusawa VLBI Observ, 2-12 Hoshigaoka Cho, Oshu, Iwate 0230861, Japan

[10] Grad Univ Adv Studies SOKENDAI, Astron Sci Program, 2-21 Osawa, Mitaka, Tokyo 1818588, Japan

[11] Zhejiang Lab, Hangzhou, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 973卷 / 02期

关键词：

SUPERMASSIVE BLACK-HOLES; RELATIVISTIC MAGNETOHYDRODYNAMIC SIMULATIONS; DWARF SEYFERT NUCLEI; HIGH-ENERGY EMISSION; M87 EVENT HORIZON; SCHWARZSCHILD RADII; VLBI OBSERVATIONS; CENTRAL-ENGINE; ACCRETION; ACCELERATION;

D O I：

10.3847/1538-4357/ad639f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study magnetic field strengths along the jet in NGC 315. First, we estimated the angular velocity of rotation in the jet magnetosphere by comparing the measured velocity profile of NGC 315 with the magnetohydrodynamic jet model proposed by Tomimatsu and Takahashi. Similar to the case of M87, we find that the model can reproduce the logarithmic feature of the velocity profile and suggest a slowly rotating black hole magnetosphere for NGC 315. By substituting the estimated Omega F into the jet power predicted by the Blandford-Znajek mechanism, we estimate the magnetic field strength near the event horizon of the central black hole as 5 x 103 G less than or similar to B H less than or similar to 2 x 104 G. We then estimate magnetic field strengths along the jet by comparing the spectral index distribution obtained from very long baseline interferometry (VLBI) observations with a synchrotron-emitting jet model. Then we constrain the magnetic field strength at a deprojected distance z from the black hole to be in the range 0.06 G less than or similar to B(z) less than or similar to 0.9 G for 5.2 x 103 r g less than or similar to z less than or similar to 4.9 x 104 r g , where r g represents the gravitational radius. By combining the obtained field strengths at the event horizon and the downstream section of the jet, we find that the accretion flow at the jet base is consistent with a magnetically arrested disk. We discuss a comparison of the jet power and the magnetic flux anchored to the event horizon in NGC 315 and M87.

引用

页数：12

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