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For most people, the night sky conjures a sense of stillness, an occasional shooting star the only visible movement. A conversation with Rishabh Datta, however, unveils the supersonic drama crashing a...
Powerful High-Velocity Dispersion Molecular Hydrogen Associated with an Intergalactic Shock Wave in Stephan's Quintet
interactions intergalactic medium
2014/12/23
We present the discovery of strong mid-infrared emission lines of molecular hydrogen of apparently high-velocity dispersion (~870 km s-1) originating from a group-wide shock wave in Stephan's Quintet....
Glycine oligomerization up to triglycine by shock experiments simulating comet impacts
comet impacts amino acids peptides shock experiments origins of life
2017/4/10
We conducted shock experiments simulating comet impacts to assess the feasibility of peptide synthesis by such a
process. We used frozen mixture of the amino acid glycine, water ice, and silicate (fo...
Constraints on the Synchrotron Shock Model for the Fermi GBM Gamma-Ray Burst 090820A
Constraints Synchrotron Shock Model Fermi GBM Gamma-Ray Burst 090820A
2011/10/18
Discerning the radiative dissipation mechanism for prompt emission in Gamma-Ray Bursts (GRBs) requires detailed spectroscopic modeling that straddles the $\nu F_{\nu}$ peak in the 100 keV - 1 MeV rang...
Magnetic Fields, Relativistic Particles, and Shock Waves in Cluster Outskirts
Magnetic Fields Relativistic Particles Shock Waves Cluster Outskirts
2011/10/20
It is only now, with low-frequency radio telescopes, long exposures with high-resolution X-ray satellites and gamma-ray telescopes, that we are beginning to learn about the physics in the periphery of...
A shock front in the merging galaxy cluster Abell 754: X-ray and radio observations
the merging galaxy cluster Abell 754 X-ray radio observations
2011/1/11
We present new Chandra X-ray and Giant Meterwave Radio Telescope (GMRT) radio observations of the nearby merging galaxy cluster Abell 754. Our X-ray data confirm the presence of a shock front by obtai...
Prospects for Detection of Exoplanet Magnetic Fields Through Bow-Shock Observations During Transits
planet-star interactions planets and satellites magnetic fields—stars
2010/11/16
An asymmetry between the ingress and egress times was observed in the near-UV light curve
of the transit planet WASP-12b. Such asymmetry led us to suggest that the early ingress in
the UV light curv...
Non-thermal radiation associated with astrophysical shock waves
Non-thermal radiation astrophysical shock waves
2010/11/10
Los trabajos que, junto con mi director, presentaremos a continuaci´on se engloban dentro
de la tesis de doctorado titulada “Emisi´on no-t´ermica asociada a ondas de choque astrof&a...
When galaxy clusters collide, they generate shock fronts in the hot intracluster medium. Observations of these shocks can provide valuable information on the merger dynamics and physical conditions in...
The Role of Diffusive Shock Acceleration on Nonequilibrium Ionization in Supernova Remnant Shocks II: Emitted Spectra
High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/6
We present a grid of nonequilibrium ionization models for the X-ray spectra from supernova remnants undergoing efficient diffusive shock acceleration. The calculation follows the hydrodynamics of the ...
Shock-in-jet model for quasars and microquasars
High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/24
We present the theoretical background and detailed equations for the synchrotron emission of a shock wave propagating in a relativistic jet. We then show how the evolution of an outburst in this shock...
On saturation of betatron acceleration of dust particles behind shock fronts
betatron acceleration dust particles shock fronts
2010/3/9
Possible saturation of betatron acceleration of dust particles behind strong shock fronts from supernovae is considered. It is argued that the efficiency of the nonthermal dust destruction should be s...
Fuse Observations of the Cygnus Loop：Probing Shock-Cloud Interactions
Cygnus Loop Shock-Cloud Interactions
2009/6/16
Fuse Observations of the Cygnus Loop：Probing Shock-Cloud Interactions。
The “Ghost Shell”：Discovery of the Forward Shock from Colliding Winds about Eta Carinae
Forward Shock Colliding Winds Eta Carinae
2009/6/15
The “Ghost Shell”：Discovery of the Forward Shock from Colliding Winds about Eta Carinae。
Tracing shock evolution in yso Jets。