Zobrazeno 1 - 10
of 119
pro vyhledávání: '"P. Pihajoki"'
Autor:
Dey, Lankeswar, Valtonen, Mauri J., Gopakumar, A., Lico, Rocco, Gomez, Jose L., Susobhanan, Abhimanyu, Komossa, S., Pihajoki, Pauli
The bright blazar OJ 287 is the best-known candidate for hosting a supermassive black hole binary system. It inspirals due to the emission of nanohertz gravitational waves (GWs). Observations of historical and predicted quasi-periodic high-brightness
Externí odkaz:
http://arxiv.org/abs/2103.05274
Autor:
Laine, Seppo, Dey, Lankeswar, Valtonen, Mauri, Gopakumar, A., Zola, Stanislaw, Komossa, S., Kidger, Mark, Pihajoki, Pauli, Gómez, Jose L., Caton, Daniel, Ciprini, Stefano, Drozdz, Marek, Gazeas, Kosmas, Godunova, Vira, Haque, Shirin, Hildebrandt, Felix, Hudec, Rene, Jermak, Helen, Kong, Albert K. H., Lehto, Harry, Liakos, Alexios, Matsumoto, Katsura, Mugrauer, Markus, Pursimo, Tapio, Reichart, Daniel E., Simon, Andrii, Siwak, Michal, Sonbas, Eda
Binary black hole (BH) central engine description for the unique blazar OJ 287 predicted that the next secondary BH impact-induced bremsstrahlung flare should peak on 2019 July 31. This prediction was based on detailed general relativistic modeling o
Externí odkaz:
http://arxiv.org/abs/2004.13392
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 3, March 2020, Pages 4131-4148
We present the novel algorithmically regularised integration method MSTAR for high accuracy ($|\Delta E/E| \gtrsim 10^{-14}$) integrations of N-body systems using minimum spanning tree coordinates. The two-fold parallelisation of the $\mathcal{O}(N_\
Externí odkaz:
http://arxiv.org/abs/2001.03180
We study the orbital evolution and gravitational wave (GW) emission of supermassive black hole (SMBH) binaries formed in gas-free mergers of massive early-type galaxies using the hybrid tree-regularized N-body code KETJU. The evolution of the SMBHs a
Externí odkaz:
http://arxiv.org/abs/1909.01373
Autor:
Valtonen, Mauri J., Zola, Staszek, Pihajoki, Pauli, Enestam, Sissi, Lehto, Harry J., Dey, Lankeswar, Gopakumar, Achamveedu, Drozdz, Marek, Ogloza, Waldemar, Zejmo, Michal, Gupta, Alok C., Pursimo, Tapio, Ciprini, Stefano, Kidger, Mark, Nilsson, Kari, Berdyugin, Andrei, Piirola, Vilppu, Jermak, Helen, Hudec, Rene, Laine, Seppo
In the binary black hole model of OJ 287 the secondary black hole orbits a much more massive primary, and impacts on the primary accretion disk at predictable times. We update the parameters of the disk, the viscosity $\alpha$ and the mass accretion
Externí odkaz:
http://arxiv.org/abs/1907.11011
Interpolation of data represented in curvilinear coordinates and possibly having some non-trivial, typically Riemannian or semi-Riemannian geometry is an ubiquitous task in all of physics. In this work we present a covariant generalization of the bar
Externí odkaz:
http://arxiv.org/abs/1907.09487
Autor:
Dey, Lankeswar, Gopakumar, Achamveedu, Valtonen, Mauri, Zola, Stanislaw, Susobhanan, Abhimanyu, Hudec, Rene, Pihajoki, Pauli, Pursimo, Tapio, Berdyugin, Andrei, Piirola, Vilppu, Ciprini, Stefano, Nilsson, Kari, Jermak, Helen, Kidger, Mark, Komossa, Stefanie
The bright blazar OJ 287 is the best-known candidate for hosting a nanohertz gravitational wave (GW) emitting supermassive binary black hole (SMBBH) in the present observable universe. The binary black hole (BBH) central engine model, proposed by Leh
Externí odkaz:
http://arxiv.org/abs/1905.02689
Autor:
Dey, Lankeswar, Valtonen, M. J., Gopakumar, A., Zola, S., Hudec, R., Pihajoki, P., Ciprini, S., Filippenko, A. V.
Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the binary black hole central engin
Externí odkaz:
http://arxiv.org/abs/1808.09309
Ray-tracing is a central tool for constructing mock observations of compact object emission and for comparing physical emission models with observations. We present Arcmancer, a publicly available general ray-tracing and tensor algebra library, writt
Externí odkaz:
http://arxiv.org/abs/1804.04670
Autor:
Nättilä, Joonas, Pihajoki, Pauli
Publikováno v:
A&A 615, A50 (2018)
A theoretical framework for emission originating from rapidly rotating oblate compact objects is described in detail. By using a Hamilton-Jacobi formalism, we show how the special relativistic rotational effects such as aberration of angles, Doppler
Externí odkaz:
http://arxiv.org/abs/1709.07292