Search Publications
Dark Jets in Solar Coronal Holes
Young, Peter R.
A new solar feature termed a dark jet is identified from observations of an extended solar coronal hole that was continuously monitored for over 44 hr by the Extreme Ultraviolet Imaging Spectrometer on board the Hinode spacecraft in 2011 February 8-10 as part of Hinode Operation Plan No. 177 (HOP 177). Line of sight (LOS) velocity maps derived fro…
Photometry of Pluto 2008-2014: Evidence of Ongoing Seasonal Volatile Transport and Activity
Buratti, B. J.; Dalba, P. A.; Hillier, J. K. +6 more
The New Horizons spacecraft will encounter Pluto in 2015 July. As this fast flyby will yield a picture of Pluto frozen in time, ground-based observations are key to understanding this dwarf ice planet, especially with regard to the seasonal transport of surface volatiles. This paper reports on changes in Pluto's rotational light curve as evidence …
The Progenitor of the FUor-Type Young Eruptive Star 2MASS J06593158-0405277
Ábrahám, P.; Kóspál, Á.; Moór, A. +3 more
Only a dozen confirmed FU Orionis-type young outbursting stars (FUors) are known today; this explains the interest in the recent FUor eruption of 2MASS J06593158-0405277. Its outburst and expected decline will be subject to numerous studies in the future. Almost equally important for the understanding of the eruption mechanism, however, is the phy…
Detecting the cosmological neutrino background in the CMB
Sellentin, Elena; Durrer, Ruth
Three relativistic particles in addition to the photon are detected in the cosmic microwave background (CMB). In the standard model of cosmology, these are interpreted as the three neutrino species. However, at the time of CMB decoupling, neutrinos are not only relativistic but they are also free-streaming. Here we investigate whether the CMB is s…
Mineralogy, morphology and stratigraphy of the light-toned interior layered deposits at Juventae Chasma
Flahaut, Jessica; Weitz, Catherine M.; Bishop, Janice L. +6 more
Juventae Chasma is a deep depression located north of Valles Marineris on Mars, with four bright mounds or light-toned interior layered deposits (ILDs) extending upwards from the Canyon floor. We present here the results of long-term imaging of Juventae Chasma including mounds A, B, C, and D using multiple datasets. Monohydrated sulfates (MHS) wer…
(No) dimming of X-ray clusters beyond z ∼ 1 at fixed mass: crude redshifts and masses from raw X-ray and SZ data
Sunyaev, R.; Churazov, E.; Vikhlinin, A.
Scaling relations in the Λ cold dark matter cosmology predict that for a given mass the clusters formed at larger redshift are hotter, denser and therefore more luminous in X-rays than their local z ∼ 0 counterparts. This effect overturns the decrease in the observable X-ray flux so that it does not decrease at z > 1, similar to the SZ signal. …
XMM-Newton and Suzaku X-Ray Shadowing Measurements of the Solar Wind Charge Exchange, Local Bubble, and Galactic Halo Emission
Henley, David B.; Shelton, Robin L.
We present results from a sample of XMM-Newton and Suzaku observations of interstellar clouds that cast shadows in the soft X-ray background (SXRB)—the first uniform analysis of such a sample from these missions. By fitting to the on- and off-shadow spectra, we separated the foreground and Galactic halo components of the SXRB. We tested different …
Geometric integration of high-resolution satellite imagery and airborne LiDAR data for improved geopositioning accuracy in metropolitan areas
Wu, Bo; Hu, Han; Zhu, Qing +3 more
High-resolution satellite imagery (HRSI) and airborne light detection and ranging (LiDAR) data are widely used for deriving 3D spatial information. However, the 3D spatial information derived from them in the same area can be inconsistent. Considering HRSI and LiDAR datasets taken from metropolitan areas as a case study, this paper presents a nove…
A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +20 more
We present new wide-field photometry and spectroscopy of the globular clusters (GCs) around NGC 4649 (M60), the third brightest galaxy in the Virgo cluster. Imaging of NGC 4649 was assembled from a recently obtained Hubble Space Telescope/Advanced Camera for Surveys mosaic, and new Subaru/Suprime-Cam and archival Canada-France-Hawaii Telescope/Meg…
Prevailing Dust-transport Directions on Comet 67P/Churyumov-Gerasimenko
Kramer, Tobias; Noack, Matthias
Dust transport and deposition behind larger boulders on the comet 67P/Churyumov-Gerasimenko (67P/C-G) have been observed by the Rosetta mission. We present a mechanism for dust-transport vectors based on a homogeneous surface activity model incorporating in detail the topography of 67P/C-G. The combination of gravitation, gas drag, and Coriolis fo…