Search Publications
Three-dimensional Dust Mapping Reveals that Orion Forms Part of a Large Ring of Dust
Price, P. A.; Rix, H. -W.; Chambers, K. C. +12 more
The Orion Molecular Complex is the nearest site of ongoing high-mass star formation, making it one of the most extensively studied molecular complexes in the Galaxy. We have developed a new technique for mapping the three-dimensional distribution of dust in the Galaxy using Pan-STARRS1 photometry. We isolate the dust at the distance to Orion using…
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…
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…
Observed Variability of the Solar Mg II h Spectral Line
De Pontieu, B.; Schmit, D.; Leenaarts, J. +3 more
The Mg ii h&k doublet are two of the primary spectral lines observed by the Sun-pointing Interface Region Imaging Spectrograph (IRIS). These lines are tracers of the magnetic and thermal environment that spans from the photosphere to the upper chromosphere. We use a double-Gaussian model to fit the Mg ii h profile for a full-Sun mosaic data se…
The Binary Mass Transfer Origin of the Red Blue Straggler Sequence in M30
Dalessandro, E.; Beccari, G.; Ferraro, F. R. +4 more
Two separated sequences of blue straggler stars (BSSs) have been revealed by Ferraro et al. in the color-magnitude diagram (CMD) of the Milky Way globular cluster M30. Their presence has been suggested to be related to the two BSS formation channels (namely, collisions and mass transfer in close binaries) operating within the same stellar system. …
The Changing Fractions of Type Ia Supernova NUV--Optical Subclasses with Redshift
Foley, Ryan J.; Narayan, Gautham; Brown, Peter J. +1 more
Ultraviolet (UV) and optical photometry of Type Ia supernovae (SNe Ia) at low redshift have revealed the existence of two distinct color groups, composed of NUV-red and NUV-blue events. The color curves differ primarily by an offset, with the NUV-blue u-v color curves bluer than the NUV-red curves by 0.4 mag. For a sample of 23 low-redshift SNe Ia…
Bow Shock Fragmentation Driven by a Thermal Instability in Laboratory Astrophysics Experiments
Hartigan, P.; Frank, A.; Lebedev, S. V. +16 more
The role of radiative cooling during the evolution of a bow shock was studied in laboratory-astrophysics experiments that are scalable to bow shocks present in jets from young stellar objects. The laboratory bow shock is formed during the collision of two counterstreaming, supersonic plasma jets produced by an opposing pair of radial foil Z-pinche…