509 citations · 2.7k across the 20 of their papers we have counts for
20 papers
The enigmatic abundance of atomic hydrogen in Saturn's upper atmosphere
Lotfi Ben-Jaffel, Julie Moses, Robert A. West +5
A planet's Lyman-α (Lyα) emission is sensitive to its thermospheric structure. Here, we report joint Hubble Space Telescope (HST) and Cassini cross-calibration observations of the…
Planet Four: A Neural Network's Search For Polar Spring-time Fans On Mars
Mark D. McDonnell, Eriita Jones, Megan E. Schwamb +3
Dark deposits visible from orbit appear in the Martian south polar region during the springtime. These are thought to form from explosive jets of carbon dioxide gas breaking throug…
Modeling the complete set of Cassini's UVIS occultation observations of Enceladus' plume
Ganna Portyankina, Larry W. Esposito, Klaus-Michael Aye +2
The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed a plume of water vapor spewing out from the south polar regions of Enceladus in occultation geometry 7 times during the…
How Martian araneiforms get their shapes: morphological analysis and diffusion-limited aggregation model for polar surface erosion
Ganna Portyankina, Candice J. Hansen, Klaus-Michael Aye
Araneiforms are radially converging systems of branching troughs exhibiting fractal properties. They are found exclusively in the Southern polar regions of Mars and believed to be…
Planet Four: Probing Springtime Winds on Mars by Mapping the Southern Polar CO Jet Deposits
K. -Michael Aye, Megan E. Schwamb, Ganna Portyankina +11
The springtime sublimation process of Mars' southern seasonal polar CO ice cap features dark fan-shaped deposits appearing on the top of the thawing ice sheet. The fan material…
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits
Megan E. Schwamb, Klaus-Michael Aye, Ganna Portyankina +7
We present the results of a systematic mapping of seasonally sculpted terrains on the South Polar region of Mars with the Planet Four: Terrains (P4T) online citizen science project…
In-flight Calibration of the Dawn Framing Camera
S. E. Schröder, T. Maue, P. Gutiérrez Marqués +5
We present a method for calibrating images acquired by the Dawn Framing Camera (FC) that is based on the results of an in-flight calibration campaign performed during the cruise fr…
Discovery of very high energy gamma-rays associated with an X-ray binary
H. E. S. S. Collaboration, :, F. Aharonian
X-ray binaries are composed of a normal star in orbit around a neutron star or stellar-mass black hole. Radio and X-ray observations have led to the presumption that some X-ray bin…
Observations of Mkn 421 in 2004 with H.E.S.S. at large zenith angles
H. E. S. S. Collaboration, :, F. Aharonian
Mkn 421 was observed during a high flux state for nine nights in April and May 2004 with the fully operational High Energy Stereoscopic System (H.E.S.S.) in Namibia. The observatio…
Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631
H. E. S. S. Collaboration, :, F. Aharonian
The serendipitous discovery of an unidentified extended TeVgamma-ray source close to the galactic plane named HESS J1303-631 at a significance of 21 standard deviations is reported…
A new population of very high energy gamma-ray sources in the Milky Way
F. A. Aharonian
Very high energy gamma-rays probe the long-standing mystery of the origin of cosmic rays. Produced in the interactions of accelerated particles in astrophysical objects, they can b…
Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with H.E.S.S
H. E. S. S. Collaboration, :, F. Aharonian
The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) gamma-rays using the H.E.S.S. 4-telescope array located in Namibia. A gamma-ray signal is detected at th…
Upper limits to the SN1006 multi-TeV gamma-ray flux from H.E.S.S. observations
F. Aharonian
Observations of the shell-type supernova remnant SN1006 have been carried out with the H.E.S.S. system of Cherenkov telescopes during 2003 (18.2h with two operating telescopes) and…
Search for TeV emission from the region around PSR B1706-44 with the H.E.S.S. experiment
H. E. S. S. Collaboration, :, F. Aharonian
The region around PSR B1706-44 has been observed with the H.E.S.S. imaging atmospheric Cherenkov telescopes in 2003. No evidence for gamma-ray emission in the TeV range was found a…
Very high energy gamma rays from the composite SNR G0.9+0.1
H. E. S. S. Collaboration, :, F. Aharonian
Very high energy (> 100 GeV) gamma-ray emission has been detected for the first time from the composite supernova remnant G0.9+0.1 using the H.E.S.S. instrument. The source is dete…
H.E.S.S. Observations of PKS 2155-304
The H. E. S. S. Collaboration, :, F. Aharonian
The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (~45 sigma) at energies greater than 160 GeV, using the H.E.S.S. stereosc…
High-energy particle acceleration in the shell of a supernova remnant
H. E. S. S. Collaboration, :, F. Aharonian
A significant fraction of the energy density of the interstellar medium is in the form of high-energy charged particles (cosmic rays). The origin of these particles remains uncerta…
Very high energy gamma rays from the direction of Sagittarius A*
H. E. S. S. Collaboration, :, F. Aharonian
We report the detection of a point-like source of very high energy (VHE) gamma-rays coincident within 1' of Sgr A*, obtained with the H.E.S.S. array of Cherenkov telescopes. The ga…
Calibration of cameras of the H.E.S.S. detector
H. E. S. S. Collaboration, :, F. Aharonian
H.E.S.S. - the High Energy Stereoscopic System- is a new system of large atmospheric Cherenkov telescopes for GeV/TeV astronomy. Each of the four telescopes of 107 m^2 mirror area…
Very high energy gamma-rays from Centaurus X-3: indications and implications
A. M. Atoyan, P. M. Chadwick, M. K. Daniel +7
A timing analysis of VHE gamma-ray observations of Cen X-3 taken with the University of Durham Mark 6 telescope was performed, using both Rayleigh and Bayesian statistics. Data fro…