Constraining the Orbit of the Supermassive Black Hole Binary 0402+379
| Autor: | Roger W. Romani, Greg B. Taylor, Alison B. Peck, Karishma Bansal, R. T. Zavala |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Supermassive black hole Radio galaxy FOS: Physical sciences Astronomy and Astrophysics Astrophysics Orbital period Astrophysics - Astrophysics of Galaxies 01 natural sciences Black hole Base (group theory) Orbit Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Very-long-baseline interferometry 010306 general physics 010303 astronomy & astrophysics Visual binary |
| Zdroj: | The Astrophysical Journal. 843:14 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/aa74e1 |
| Popis: | The radio galaxy 0402+379 is believed to host a supermassive black hole binary (SMBHB). The two compact core 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 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 $\beta=v/c=0.0054 \pm 0.0003$ at $PA= -34.4^\circ$. With some assumptions about the orbit, we use this measurement to constrain the orbital period $P\approx 3 \times 10^4$ y and SMBHB mass $M \approx 15 \times 10^9\ M_\odot$. 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. |
| Databáze: | OpenAIRE |
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