Search Publications
Spectroscopy of Very Hot Plasma in Non-flaring Parts of a Solar Limb Active Region: Spatial and Temporal Properties
Teriaca, Luca; Testa, Paola; Petralia, Antonino +4 more
In this work we investigate the thermal structure of an off-limb active region (AR) in various non-flaring areas, as it provides key information on the way these structures are heated. In particular, we concentrate on the very hot component (> 3 {MK}) as it is a crucial element to distinguish between different heating mechanisms. We present an …
Heating of an Erupting Prominence Associated with a Solar Coronal Mass Ejection on 2012 January 27
Moon, Yong-Jae; Reeves, Katharine K.; Raymond, John C. +2 more
We investigate the heating of an erupting prominence and loops associated with a coronal mass ejection and X-class flare. The prominence is seen as absorption in EUV at the beginning of its eruption. Later, the prominence changes to emission, which indicates heating of the erupting plasma. We find the densities of the erupting prominence using the…
Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS
Oswalt, T. D.; Zhao, G.; Zhang, L. +3 more
We have cross-matched the LAMOST DR3 with the Gaia DR1 TGAS catalogs and obtained a sample of 166,827 stars with reliable kinematics. A technique based on the wavelet transform was applied to detect significant overdensities in velocity space among five subsamples divided by spatial position. In total, 16 significant overdensities of stars with ve…
Crowded Field Galaxy Photometry: Precision Colors in the CLASH Clusters
Koekemoer, Anton M.; Donahue, Megan; Voit, G. Mark +8 more
We present a new method for photometering objects in galaxy clusters. We introduce a mode-filtering technique for removing spatially variable backgrounds, improving both detection and photometric accuracy (roughly halving the scatter in the red sequence compared to previous catalogs of the same clusters). This method is based on robustly determini…
Chromospherically Active Stars in the RAVE Survey. II. Young Dwarfs in the Solar Neighborhood
Gilmore, G.; Freeman, K. C.; Munari, U. +19 more
A large sample of over 38,000 chromospherically active candidate solar-like stars and cooler dwarfs from the RAVE survey is addressed in this paper. An improved activity identification with respect to the previous study was introduced to build a catalog of field stars in the solar neighborhood with an excess emission flux in the calcium infrared t…
Probing the Cold Dust Emission in the AB Aur Disk: A Dust Trap in a Decaying Vortex?
Cernicharo, José; Fuente, Asunción; Baruteau, Clément +6 more
One serious challenge for planet formation is the rapid inward drift of pebble-sized dust particles in protoplanetary disks. Dust trapping at local maxima in the disk gas pressure has received much theoretical attention but still lacks observational support. The cold dust emission in the AB Aur disk forms an asymmetric ring at a radius of about 12…
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…