Astrophysical and relativistic modeling of the recoiling black hole candidate in quasar 3C 186

被引:0
作者
Boschini, Matteo [1 ,2 ]
Gerosa, Davide [1 ,2 ,3 ,4 ]
Salafia, Om Sharan [2 ,5 ]
Dotti, Massimo [1 ,2 ]
机构
[1] Univ Milano Bicocca, Dipartimento Fis G Occhialini, Piazza Sci 3, I-20126 Milan, Italy
[2] Sez Milano Bicocca, INFN, Piazza Sci 3, I-20126 Milan, Italy
[3] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, England
[4] Univ Birmingham, Inst Gravitat Wave Astron, Birmingham B15 2TT, England
[5] INAF Osservatorio Astron Brera, Via Bianchi 46, I-23807 Merate, Italy
关键词
gravitational waves; relativistic processes; quasars: supermassive black holes; HIGH-RESOLUTION OBSERVATIONS; SYSTEMATIC SEARCH; GALACTIC NUCLEI; HOST GALAXY; BINARY; AGN; MERGER; SHOCKS; JETS;
D O I
10.1051/0004-6361/202449596
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The compact object in quasar 3C 186 is one of the most promising recoiling black hole candidates, exhibiting both an astrometric displacement between the quasar and the host galaxy as well as a spectroscopic shift between broad and narrow lines. 3C 186 also presents a radio jet that, when projected onto the plane of the sky, appears to be perpendicular to the quasar-galaxy displacement. Assuming a gravitational-wave kick is indeed responsible for the properties of 3C 186 and using state-of-the-art relativistic modeling, we show that current observations allow for exquisite modeling of the recoiling black hole. Most notably, we find that the kick velocity and the black hole spin are almost collinear with the line of sight and the two former vectors appear perpendicular to each other only because of a strong projection effect. The targeted configuration requires substantial fine-tuning: while there is a region in the black hole binary parameter space that is compatible with 3C 186, the observed system appears to be a rare occurrence. Using archival radio observations, we explored different strategies that could potentially confirm or rule out our interpretation. In particular, we developed two observational tests that rely on the brightness ratio between the approaching and receding jet as well as the asymmetry of the jet lobes. While the available radio data provide loose constraints, deeper observations have the unique potential of unveiling the nature of 3C 186.
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页数:12
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