scholarly journals The effect of impact parameter on tidal disruption events

2020 ◽  
Vol 501 (2) ◽  
pp. 1748-1754
Author(s):  
Alexandra Spaulding ◽  
Philip Chang
Keyword(s):  
Black Hole ◽  
Energy Distribution ◽  
Impact Parameter ◽  
Moving Mesh ◽  
Tidal Disruption ◽  
Tidal Gravity ◽  
Supermassive Black Hole ◽  
Complete Destruction ◽  
The Impact ◽  
Peak Luminosity

ABSTRACT Stars that pass too close to a supermassive black hole are disrupted by the black hole’s tidal gravity. Some debris is ejected while the remainder accretes into the black hole. To better study the physics of these debris, we use the moving mesh code manga to follow the evolution of the star from its initial encounter to its complete destruction. By varying the impact parameter (β) of the star, we study the energy distribution of the remaining material and the fallback rate of the material into the black hole as a function of time. We show that the spread of energy in the debris and peak luminosity time (tpeak) are both directly related to the impact parameter. In particular, we find a β1/2 scaling for the energy spread for β = 2 − 10 that levels off at β ≳ 10. We discuss implication of this scaling for the rise time of the light curve and broadness of the luminosity peak for these lower β’s. These relationships provide a possible means of inferring the impact parameters for observed tidal disruption events.

scholarly journals X-ray flares from the stellar tidal disruption by a candidate supermassive black hole binary

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Xinwen Shu ◽  
Wenjie Zhang ◽  
Shuo Li ◽  
Ning Jiang ◽  
Liming Dou ◽  
...  
Keyword(s):  
Black Hole ◽  
X Rays ◽  
Tidal Disruption ◽  
Massive Black Hole ◽  
Ultraviolet Emission ◽  
X Ray ◽  
Black Hole Binaries ◽  
Supermassive Black Hole ◽  
Black Hole Binary

AbstractOptical transient surveys have led to the discovery of dozens of stellar tidal disruption events (TDEs) by massive black hole in the centers of galaxies. Despite extensive searches, X-ray follow-up observations have produced no or only weak X-ray detections in most of them. Here we report the discovery of delayed X-ray brightening around 140 days after the optical outburst in the TDE OGLE16aaa, followed by several flux dips during the decay phase. These properties are unusual for standard TDEs and could be explained by the presence of supermassive black hole binary or patchy obscuration. In either scenario, the X-rays can be produced promptly after the disruption but are blocked in the early phase, possibly by a radiation-dominated ejecta which leads to the bulk of optical and ultraviolet emission. Our findings imply that the reprocessing is important in the TDE early evolution, and X-ray observations are promising in revealing supermassive black hole binaries.

scholarly journals Tidal disruption as a probe for supermassive black hole binaries

2014 ◽  
Vol 10 (S312) ◽  
pp. 43-47
Author(s):  
Shuo Li ◽  
Fukun Liu ◽  
Peter Berczik ◽  
Rainer Spurzem
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Galactic Center ◽  
Galaxy Mergers ◽  
Tidal Disruption ◽  
Black Hole Binaries ◽  
Supermassive Black Hole ◽  
Before And After ◽  
Many Core ◽  
Disruption Event

AbstractSupermassive black hole binaries (SMBHBs) are the products of frequent galaxy mergers. It is very hard to be detected in quiescent galaxy. By using one million particle direct N-body simulations on special many-core hardware (GPU cluster), we study the dynamical co-evolution of SMBHB and its surrounding stars, specially focusing on the evolution of stellar tidal disruption event (TDE) rates before and after the coalescence of the SMBHB. We find a boosted TDE rate during the merger of the galaxies. After the coalescence of two supermassive black holes (SMBHs), the post-merger SMBH can get a kick velocity due to the anisotropic GW radiations. Our results about the recoiling SMBH, which oscillates around galactic center, show that most of TDEs are contributed by unbound stars when the SMBH passing through galactic center. In addition, the TDE light curve in SMBHB system is significantly different from the curve for single SMBH, which can be used to identify the SMBHB.

scholarly journals The impact of reionization on the formation of supermassive black hole seeds

2014 ◽  
Vol 445 (1) ◽  
pp. 686-693 ◽  
Author(s):  
Jarrett L. Johnson ◽  
Daniel J. Whalen ◽  
Bhaskar Agarwal ◽  
Jan-Pieter Paardekooper ◽  
Sadegh Khochfar
Keyword(s):  
Black Hole ◽  
Supermassive Black Hole ◽  
The Impact

scholarly journals Tidal disruption events from supermassive black hole binaries

2016 ◽  
Vol 465 (4) ◽  
pp. 3840-3864 ◽  
Author(s):  
Eric R. Coughlin ◽  
Philip J. Armitage ◽  
Chris Nixon ◽  
Mitchell C. Begelman
Keyword(s):  
Black Hole ◽  
Tidal Disruption ◽  
Black Hole Binaries ◽  
Supermassive Black Hole

scholarly journals The Radio Scream from black holes at Cosmic Dawn: a semi-analytic model for the impact of radio-loud black holes on the 21 cm global signal

2019 ◽  
Vol 492 (4) ◽  
pp. 6086-6104 ◽  
Author(s):  
Aaron Ewall-Wice ◽  
Tzu-Ching Chang ◽  
T Joseph W Lazio
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Point Sources ◽  
Absorption Feature ◽  
Analytic Model ◽  
Supermassive Black Hole ◽  
Global Signal ◽  
Deep Point ◽  
Large Populations ◽  
The Impact

ABSTRACT We use a semi-analytic model to explore the potential impact of a brief and violent period of radio-loud accretion on to black holes (The Radio Scream) during the Cosmic Dawn on the H i hyperfine 21 cm signal. We find that radio emission from supermassive black hole seeds can impact the global 21 cm signal at the level of tens to hundreds of per cent provided that they were as radio loud as $z$ ≈ 1 black holes and obscured by gas with column depths of NH ≳ 1023 cm−2. We determine plausible sets of parameters that reproduce some of the striking features of the EDGES absorption feature including its depth, timing, and side steepness while producing radio/X-ray backgrounds and source counts that are consistent with published limits. Scenarios yielding a dramatic 21 cm signature also predict large populations of ∼$\mu$Jy point sources that will be detectable in future deep surveys from the Square Kilometer Array (SKA). Thus, 21 cm measurements, complemented by deep point-source surveys, have the potential to constrain optimistic scenarios where supermassive black hole progenitors were radio loud.

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