Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-timing Analysis
| Autor: | Jeroen Homan, Jingyi Wang, Thomas Dauser, Edward M. Cackett, Douglas J. K. Buisson, Rob Fender, Joe Bright, Javier Garcia, Michiel van der Klis, Guglielmo Mastroserio, Andrew C. Fabian, Matteo Lucchini, Adam Ingram, James F. Steiner, Ron Remillard, Erin Kara, Riley M. T. Connors |
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| Přispěvatelé: | High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Jet (fluid) Reverberation 010504 meteorology & atmospheric sciences High-energy astronomy Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Jet stream 01 natural sciences Corona Spectral line law.invention Amplitude Space and Planetary Science law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics 0105 earth and related environmental sciences Flare |
| Zdroj: | Astrophysical Journal Letters, 910(1):L3. IOP Publishing Ltd. |
| ISSN: | 2041-8205 |
| Popis: | We analyze 5 epochs of NICER data of the black hole X-ray binary MAXI J1820+070 during the bright hard-to-soft state transition in its 2018 outburst with both reflection spectroscopy and Fourier-resolved timing analysis. We confirm the previous discovery of reverberation lags in the hard state, and find that the frequency range where the (soft) reverberation lag dominates decreases with the reverberation lag amplitude increasing during the transition, suggesting an increasing X-ray emitting region, possibly due to an expanding corona. By jointly fitting the lag-energy spectra in a number of broad frequency ranges with the reverberation model reltrans, we find the increase in reverberation lag is best described by an increase in the X-ray coronal height. This result, along with the finding that the corona contracts in the hard state, suggests a close relationship between spatial extent of the X-ray corona and the radio jet. We find the corona expansion (as probed by reverberation) precedes a radio flare by ~5 days, which may suggest that the hard-to-soft transition is marked by the corona expanding vertically and launching a jet knot that propagates along the jet stream at relativistic velocities. 16 pages, 10 figures, accepted to be published in ApJL |
| Databáze: | OpenAIRE |
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