Constraining the Orbit of the Supermassive Black Hole Binary 0402+379

被引：71

作者：

Bansal, K. ^{[1
]}

Taylor, G. B. ^{[1
,2
]}

Peck, A. B. ^{[2
,3
]}

Zavala, R. T. ^{[4
]}

Romani, R. W. ^{[5
]}

机构：

[1] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

[2] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA

[3] Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 USA

[4] US Naval Observ, Flagstaff Stn 10391 W Naval Observ Rd, Flagstaff, AZ 86001 USA

[5] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 843卷 / 01期

基金：

美国国家航空航天局;

关键词：

gravitational waves; quasars: supermassive black holes; COMPACT SYMMETRIC OBJECTS; LONG-TERM EVOLUTION; GALACTIC NUCLEI; STELLAR ENVIRONMENT; GAS; MERGERS; DISCS; JETS; ASTROPHYSICS; POLARIMETRY;

D O I：

10.3847/1538-4357/aa74e1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The radio galaxy 0402+379 is believed to host a supermassive black hole binary (SMBHB). The two compactcore sources are separated by a projected distance of 7.3 pc, making it the most (spatially) compact resolved SMBHB known. We present new multi-frequency VLBI observations of 0402+379 at 5, 8, 15, and 22 GHz and combine them with previous observations spanning 12 years. A strong frequency-dependent core shift is evident, which we use to infer magnetic fields near the jet base. After correcting for these shifts we detect significant relative motion of the two cores at beta = nu/c = 0.0054 +/- 0.0003 at PA = -34.degrees 4. With some assumptions about the orbit, we use this measurement to constrain the orbital period P approximate to 3 x 10(4) yr and SMBHB mass M approximate to 15 x 10(9) M-circle dot. While additional observations are needed to confirm this motion and obtain a precise orbit, this is apparently the first black hole system resolved as a visual binary.

引用

页数：9

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