Search Publications
The formation and evolution of youthful gullies on Mars: Gullies as the late-stage phase of Mars’ most recent ice age
Head, James W.; Dickson, James L.
Gullies are extremely young erosional/depositional systems on Mars that have been carved by an agent that was likely to have been comprised in part by liquid water [Malin, M.C., Edgett, K.S., 2000. Evidence for recent groundwater seepage and surface runoff on Mars. Science 288, 2330-2335; McEwen, A.S. et al., 2007. A closer look at water-related g…
Automated Coronal Hole Detection Using Local Intensity Thresholding Techniques
Gallagher, Peter T.; Krista, Larisza D.
We identify coronal holes using a histogram-based intensity thresholding technique and compare their properties to fast solar wind streams at three different points in the heliosphere. The thresholding technique was tested on EUV and X-ray images obtained using instruments onboard STEREO, SOHO and Hinode. The full-disk images were transformed into…
Local Lyman Break Galaxy Analogs: The Impact of Massive Star-Forming Clumps on the Interstellar Medium and the Global Structure of Young, Forming Galaxies
Heckman, Timothy M.; Rich, R. Michael; Seibert, Mark +10 more
We report on the results of Hubble Space Telescope optical and UV imaging, Spitzer mid-IR photometry, and optical spectroscopy of a sample of 30 low-redshift (z ~ 0.1 to 0.3) galaxies chosen from the Sloan Digital Sky Survey and Galaxy Evolution Explorer surveys to be accurate local analogs of the high-redshift Lyman break galaxies. The Lyman brea…
Hinode/EIS observations of propagating low-frequency slow magnetoacoustic waves in fan-like coronal loops
Wang, T. J.; Davila, J. M.; Mariska, J. T. +1 more
Aims: We report the first observation of multiple-periodic propagating disturbances along a fan-like coronal structure simultaneously detected in both intensity and Doppler shift in the Fe xii 195 Å line with the EUV Imaging Spectrometer (EIS) onboard Hinode. A new application of coronal seismology is provided based on this observation.
Method…
Gamma-ray emission from SNR RX J1713.7-3946 and the origin of galactic cosmic rays
Morlino, G.; Amato, E.; Blasi, P.
We calculate the flux of non-thermal radiations from the supernova remnant (SNR) RX J1713.7-3946 in the context of the non-linear theory of particle acceleration at shocks, which allows us to take into account self-consistently the dynamical reaction of the accelerated particles, the generation of magnetic fields in the shock proximity and the dyn…
The B0.5IVe CoRoT target HD 49330. I. Photometric analysis from CoRoT data
Auvergne, M.; Baudin, F.; Michel, E. +19 more
Context: Be stars undergo outbursts producing a circumstellar disk from the ejected material. The beating of non-radial pulsations has been put forward as a possible mechanism of ejection.
Aims: We analyze the pulsational behavior of the early B0.5IVe star HD 49330 observed during the first CoRoT long run towards the Galactical anticenter (LRA…
Energetic ion spectral characteristics in the Saturnian magnetosphere using Cassini/MIMI measurements
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +3 more
We report sample results on Saturn magnetospheric energetic ion spectral shapes using measurements obtained from the Magnetospheric Imaging Instrument (MIMI) suite onboard Cassini. The ion intensities are measured by the Charge Energy Mass Spectrometer (CHEMS) that covers the energy range of 3 to 236 keV/e, the Low Energy Magnetospheric Measuremen…
Active Region Transition Region Loop Populations and Their Relationship to the Corona
Warren, Harry P.; Ugarte-Urra, Ignacio; Brooks, David H.
The relationships among coronal loop structures at different temperatures are not settled. Previous studies have suggested that coronal loops in the core of an active region (AR) are not seen cooling through lower temperatures and therefore are steadily heated. If loops were cooling, the transition region would be an ideal temperature regime to lo…
Asteroseismic analysis of the CoRoT δ Scuti star HD 174936
Auvergne, M.; Amado, P. J.; Baudin, F. +13 more
We present an analysis of the δ-Scuti star HD 174936 (
The XMM-Newton serendipitous survey. VI. The X-ray luminosity function
Silverman, J. D.; Ebrero, J.; Page, M. J. +6 more
Aims: To study the cosmological evolution of active galactic nuclei (AGN) is one of the main goals of X-ray surveys. To accurately determine the intrinsic (before absorption) X-ray luminosity function, it is essential to constrain the evolutionary properties of AGN and therefore the history of the formation of supermassive black holes with cosmic …