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24 papers · 1 filter
Robo-AO: An Autonomous Laser Adaptive Optics and Science System
Christoph Baranec, Reed Riddle, A. N. Ramaprakash +15
Robo-AO, a fully autonomous, laser guide star adaptive optics and science system, is being commissioned at Palomar Observatory's 60-inch telescope. Here we discuss the instrument,…
MHD instabilities in accretion mounds - 1: 2D axisymmetric simulations
Dipanjan Mukherjee, Dipankar Bhattacharya, Andrea Mignone
We have performed stability analysis of axisymmetric accretion mounds on neutron stars in High Mass X-ray Binaries (HMXB) by 2-D MHD simulations with the PLUTO MHD code. We find th…
Fluctuation dynamos and their Faraday rotation signatures
Pallavi Bhat, Kandaswamy Subramanian
Turbulence is ubiquitous in many astrophysical systems like galaxies, galaxy clusters and possibly even the IGM filaments. We study fluctuation dynamo action in turbulent systems f…
Doppler shift of hot coronal lines in a moss area of an active region
Neda Dadashi, Luca Teriaca, Durgesh Tripathi +2
The moss is the area at the footpoint of the hot (3 to 5 MK) loops forming the core of the active region where emission is believed to result from the heat flux conducted down to t…
Observational evidences for spinning black holes: A proof of general relativity for spacetime around rotating black holes
Banibrata Mukhopadhyay, Debbijoy Bhattacharya, P. Sreekumar
Since it was theorized by Kerr in 1963, determining the spin of black holes from observed data was paid very little attention until few years back. The main reasons behind this wer…
Can a marginally open universe amplify magnetic fields?
Yuri Shtanov, Varun Sahni
In a series of recent papers, including arXiv:1210.1183, it was claimed that large-scale magnetic fields generated during inflation in a spatially open universe could remain astrop…