Search Publications
The Dynamics of Very High Alfvén Mach Number Shocks in Space Plasmas
Burgess, David; Sulaiman, Ali H.; Sundberg, Torbjörn +2 more
Astrophysical shocks, such as planetary bow shocks or supernova remnant shocks, are often in the high or very-high Mach number regime, and the structure of such shocks is crucial for understanding particle acceleration and plasma heating, as well inherently interesting. Recent magnetic field observations at Saturn’s bow shock, for Alfvén Mach numb…
Physical Structures of the Type Ia Supernova Remnant N103B
Walter, Frederick M.; Pan, Kuo-Chuan; Ricker, Paul M. +6 more
N103B is a Type Ia supernova remnant (SNR) projected in the outskirts of the superbubble around the rich cluster NGC 1850 in the Large Magellanic Cloud (LMC). We have obtained Hα and continuum images of N103B with the Hubble Space Telescope (HST) and high-dispersion spectra with the 4 m and 1.5 m telescopes at Cerro Tololo Inter-American Observato…
Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1-2403
Grillo, C.; Balestra, I.; Rosati, P. +6 more
We present a novel approach for a combined analysis of X-ray and gravitational lensing data and apply this technique to the merging galaxy cluster MACS J0416.1-2403. The method exploits the information on the intracluster gas distribution that comes from a fit of the X-ray surface brightness and then includes the hot gas as a fixed mass component …
Statistical Study of Solar Dimmings Using CoDiT
Krista, Larisza D.; Reinard, Alysha A.
We present the results from analyzing the physical and morphological properties of 154 dimmings (transient coronal holes) and the associated flares and coronal mass ejections (CMEs). Each dimming in our 2013 catalog was processed with the semi-automated Coronal Dimming Tracker using Solar Dynamics Observatory AIA 193 Å observations and HMI magneto…
The Grism Lens-Amplified Survey from Space (GLASS). VIII. The Influence of the Cluster Properties on Hα Emitter Galaxies at 0.3 < z < 0.7
Pentericci, Laura; Schmidt, Kasper B.; Treu, Tommaso +13 more
Exploiting the data of the Grism Lens-Amplified Survey from Space (GLASS), we characterize the spatial distribution of star formation in 76 highly active star-forming galaxies in 10 clusters at 0.3< z< 0.7. All of these galaxies are likely restricted to first infall. In a companion paper, we contrast the properties of field and cluster galax…
Solar Ellerman Bombs in 1D Radiative Hydrodynamics
Doyle, J. G.; Mathioudakis, M.; Reid, A. +2 more
Recent observations from the Interface Region Imaging Spectrograph appear to show impulsive brightenings in high temperature lines, which when combined with simultaneous ground-based observations in Hα, appear co-spatial to Ellerman Bombs (EBs). We use the RADYN one-dimensional radiative transfer code in an attempt to try and reproduce the observe…
Stripped Elliptical Galaxies as Probes of ICM Physics. III. Deep Chandra Observations of NGC 4552: Measuring the Viscosity of the Intracluster Medium
Churazov, E.; Forman, W. R.; Nulsen, P. E. J. +7 more
We present results from a deep (200 ks) Chandra observation of the early-type galaxy NGC 4552 (M89), which is falling into the Virgo cluster. Previous shallower X-ray observations of this galaxy showed a remnant gas core, a tail to the South of the galaxy, and twin “horns” attached to the northern edge of the gas core. In our deeper data, we detec…
Corotating Magnetic Reconnection Site in Saturn’s Magnetosphere
Lewis, G. R.; Coates, A. J.; Dougherty, M. K. +12 more
Using measurements from the Cassini spacecraft in Saturn’s magnetosphere, we propose a 3D physical picture of a corotating reconnection site, which can only be driven by an internally generated source. Our results demonstrate that the corotating magnetic reconnection can drive an expansion of the current sheet in Saturn’s magnetosphere and, conseq…
Pressure Profiles of Distant Galaxy Clusters in the Planck Catalogue
Bourdin, H.; Mazzotta, P.; Vikhlinin, A. +2 more
Successive releases of Planck data have demonstrated the strength of the Sunyaev-Zeldovich (SZ) effect in detecting hot baryons out to the galaxy cluster peripheries. To infer the hot gas pressure structure from nearby galaxy clusters to more distant objects, we developed a parametric method that models the spectral energy distribution and spatial…
Diffuse Interstellar Bands and the Ultraviolet Extinction Curves: The Missing Link Revisited
Li, Aigen; Xiang, F. Y.; Zhong, J. X.
A large number of interstellar absorption features at ∼4000 Å-1.8 µm, known as the “diffuse interstellar bands” (DIBs), remains unidentified. Most recent works relate them to large polycyclic aromatic hydrocarbon (PAH) molecules or ultrasmall carbonaceous grains which are also thought to be responsible for the 2175 \mathringA extinction bump…