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Ancient volcanism and its implication for thermal evolution of Mars
Huang, Jun; Xiao, Long; Greeley, Ronald +4 more
Volcanism plays an important role in the formation and thermal evolution of the crusts of all terrestrial planets. Martian volcanoes have been extensively studied, and it has been suggested that the volcanism on Mars that created the visible volcanic features was initiated in the Noachian (> 3.8 Ga) and continued to the Late Amazonian (< 0.1…
Tracing the Gas to the Virial Radius (R 100) in a Fossil Group
Humphrey, Philip J.; Buote, David A.; Brighenti, Fabrizio +3 more
We present a Chandra, Suzaku, and ROSAT study of the hot intragroup medium (IGrM) of the relaxed fossil group/poor cluster RX J1159+5531. This group exhibits an advantageous combination of flat surface brightness profile, high luminosity, and optimal distance, allowing the gas to be detected out to the virial radius (R vir≡ R 108
Analyzing Star Cluster Populations with Stochastic Models: The Hubble Space Telescope/Wide Field Camera 3 Sample of Clusters in M83
Whitmore, Bradley C.; Chandar, Rupali; Fouesneau, Morgan +1 more
The majority of clusters in the universe have masses well below 105 M ⊙. Hence, their integrated fluxes and colors can be affected by the presence or absence of a few bright stars introduced by stochastic sampling of the stellar mass function. Specific methods are being developed to extend the analysis of cluster energy distr…
Time-dependent MHD modeling of the global solar corona for year 2007: Driven by daily-updated magnetic field synoptic data
Liu, Yang; Wu, S. T.; Feng, X. S. +3 more
In this paper, we develop a time-dependent MHD model driven by the daily-updated synoptic magnetograms (MHD-DUSM) to study the dynamic evolution of the global corona with the help of the 3D Solar-Interplanetary (SIP) adaptive mesh refinement (AMR) space-time conservation element and solution element (CESE) MHD model (SIP-AMR-CESE MHD Model). To ac…
Discovery of a Be/X-ray pulsar binary and associated supernova remnant in the Wing of the Small Magellanic Cloud
Gruendl, R. A.; Gallagher, J. S., III; Chu, Y. -H. +6 more
We report on a new Be/X-ray pulsar binary located in the Wing of the Small Magellanic Cloud (SMC). The strong pulsed X-ray source was discovered with the Chandra and XMM-Newton X-ray observatories. The X-ray pulse period of 1062 s is consistently determined from both Chandra and XMM-Newton observations, revealing one of the slowest rotating X-ray …
Solar-stellar astrophysics and dark matter
Turck-Chièze, Sylvaine; Lopes, Ilídio
In this review, we recall how stars contribute to the search for dark matter and the specific role of the Sun. We describe a more complete picture of the solar interior that emerges from neutrino detections, gravity and acoustic mode measurements of the Solar and Heliospheric Observatory (SOHO) satellite, becoming a reference for the most common s…
Star-Galaxy Classification in Multi-band Optical Imaging
Hogg, David W.; Fadely, Ross; Willman, Beth
Ground-based optical surveys such as PanSTARRS, DES, and LSST will produce large catalogs to limiting magnitudes of r >~ 24. Star-galaxy separation poses a major challenge to such surveys because galaxies—even very compact galaxies—outnumber halo stars at these depths. We investigate photometric classification techniques on stars and galaxies w…
The X-ray lightcurve of Sagittarius A* over the past 150 years inferred from Fe-Kα line reverberation in Galactic centre molecular clouds
Capelli, R.; Warwick, R. S.; Porquet, D. +2 more
Context. The spatial distribution and variability of Fe-Kα emission from molecular clouds in the Galactic centre region may provide an important key to the understanding of the recent history of Sgr A*. A very plausible interpretation is that this variability represents an echo in the reflected radiation from the clouds of a past episode of high a…
Quantifying the faint structure of galaxies: the late-type spiral NGC 2403
Jablonka, P.; Ferguson, Annette M. N.; Irwin, M. J. +2 more
Ground-based surveys have mapped the stellar outskirts of Local Group disc galaxies in unprecedented detail, but extending this work to other galaxies is necessary in order to overcome stochastic variations in evolutionary history and provide more stringent constraints on cosmological galaxy formation models. As part of our continuing programme of…
Profiling filaments: comparing near-infrared extinction and submillimetre data in TMC-1
Juvela, M.; André, Ph.; Palmeirim, P. +3 more
Context. Interstellar filaments are an important part of the star formation process. In order to understand the structure and formation of filaments, the filament cross-section profiles are often fitted with the so-called Plummer profile function. Currently this profiling is often approached with submillimetre studies, especially with Herschel. If…