Search Publications
A SMACK Model of Colliding Planetesimals in the β Pictoris Debris Disk
Nesvold, Erika R.; Kuchner, Marc J.
We present a new model of the β Pictoris disk-and-planet system that simulates both the planetesimal collisions and the dynamics of the resulting dust grains, allowing us to model features and asymmetries in both thermal and scattered light images of the disk. Our two-part model first simulates the collisional and dynamical evolution of the planet…
Study of Solar Energetic Particle Associations with Coronal Extreme-ultraviolet Waves
Moon, Y. -J.; Innes, D. E.; Bucik, R. +2 more
We study the relationship between large gradual solar energetic particle (SEP) events and associated extreme-ultraviolet (EUV) wave properties in 16 events that occurred between 2010 August and 2013 May and were observed by SDO, the Solar and Heliospheric Observatory (SOHO), and/or STEREO. We determine onset times, peak times, and peak fluxes of t…
The Differential Size Growth of Field and Cluster Galaxies at z = 2.1 Using the ZFOURGE Survey
Papovich, Casey; Allen, Rebecca J.; Kacprzak, Glenn G. +14 more
There is ongoing debate regarding the extent that environment affects galaxy size growth beyond z ≥ 1. To investigate the differences in star-forming and quiescent galaxy properties as a function of environment at z = 2.1, we create a mass-complete sample of 59 cluster galaxies and 478 field galaxies with log(M*/{{M}⊙ }) ≥ 9 …
Global Structure of Isothermal Diffuse X-Ray Emission along the Fermi Bubbles
Cheung, C. C.; Kataoka, J.; Nakashima, S. +4 more
In our previous works, we found absorbed thermal X-ray plasma with kT ≃ 0.3 keV observed ubiquitously near the edges of the Fermi bubbles and interpreted this emission as weakly shock-heated Galactic halo gas. Here we present a systematic and uniform analysis of archival Suzaku (29 pointings; 6 newly presented) and Swift (68 pointings; 49 newly pr…
Long-term variations of the UV contrast on Venus observed by the Venus Monitoring Camera on board Venus Express
Schröder, S. E.; Imamura, T.; Marcq, E. +1 more
We analyze the Venus ultraviolet (UV) reflectivity as observed by the Venus Monitoring Camera on board Venus Express over 2000 orbits in the years 2006-2011. We compare several laws for the photometric correction of global images of Venus, and find that the combined law of Lambert and Lommel-Seeliger is most suitable for our study. Our analysis of…
The INTEGRAL/SPI view of A0535+26 during the Giant Outburst of 2011 February
Jourdain, E.; Roques, J. P.; Sartore, N.
A0535+26 is a slowly rotating pulsar accreting from the wind of a massive Be star and exhibits two cyclotron absorption lines in its X-ray spectrum, at about 45 and 100 keV, respectively. Unlike similar sources, no significant variations of the energy of its cyclotron lines with flux have been observed to date. The bright outburst of 2011 February…
Constraining the evolution of the CMB temperature with SZ measurements from Planck data
Martins, C. J. A. P.; De Petris, M.; Génova-Santos, R. T. +2 more
The CMB temperature-redshift relation, TCMB(z)=T0(1+z), is a key prediction of the standard cosmology but is violated in many non-standard models. Constraining possible deviations from this law is an effective way to test the ΛCDM paradigm and to search for hints of new physics. We have determined TCMB(z), with a p…
Filaments in the Lupus molecular clouds
Hill, T.; White, G. J.; Arzoumanian, D. +19 more
We have studied the filaments extracted from the column density maps of the nearby Lupus 1, 3, and 4 molecular clouds, derived from photometric maps observed with the Herschel satellite. Filaments in the Lupus clouds have quite low column densities, with a median value of ∼1.5 × 1021 cm-2 and most have masses per unit length …
V444 Cygni X-ray and polarimetric variability: Radiative and Coriolis forces shape the wind collision region
Corcoran, M. F.; Russell, C. M. P.; Nazé, Y. +8 more
We present results from a study of the eclipsing, colliding-wind binary V444 Cyg that uses a combination of X-ray and optical spectropolarimetric methods to describe the 3D nature of the shock and wind structure within the system. We have created the most complete X-ray light curve of V444 Cyg to date using 40 ks of new data from Swift, and 200 ks…
High S/N Keck and Gemini AO imaging of Uranus during 2012-2014: New cloud patterns, increasing activity, and improved wind measurements
Sromovsky, L. A.; Fry, P. M.; Hammel, H. B. +2 more
We imaged Uranus in the near infrared from 2012 into 2014, using the Keck/NIRC2 camera and Gemini/NIRI camera, both with adaptive optics. We obtained exceptional signal to noise ratios by averaging 8-16 individual exposures in a planet-fixed coordinate system. These noise-reduced images revealed many low-contrast discrete features and large scale …