Search Publications
Morphological and Kinematic Evolution of Three Interacting Coronal Mass Ejections of 2011 February 13-15
Srivastava, Nandita; Mishra, Wageesh
During 2011 February 13-15, three Earth-directed coronal mass ejections (CMEs) launched in succession were recorded as limb CMEs by STEREO/SECCHI coronagraphs (COR). These CMEs provided an opportunity to study their geometrical and kinematic evolution from multiple vantage points. In this paper, we examine the differences in geometrical evolution …
Diffusion of Magnetic Elements in a Supergranular Cell
Bellot Rubio, L.; Giannattasio, F.; Berrilli, F. +2 more
Small scale magnetic fields (magnetic elements) are ubiquitous in the solar photosphere. Their interaction can provide energy to the upper atmospheric layers, and contribute to heat the solar corona. In this work, the dynamic properties of magnetic elements in the quiet Sun are investigated. The high number of magnetic elements detected in a super…
Search for Surviving Companions in Type Ia Supernova Remnants
Pan, Kuo-Chuan; Ricker, Paul M.; Taam, Ronald E.
The nature of the progenitor systems of type Ia supernovae (SNe Ia) is still unclear. One way to distinguish between the single-degenerate scenario and double-degenerate scenario for their progenitors is to search for the surviving companions (SCs). Using a technique that couples the results from multi-dimensional hydrodynamics simulations with ca…
Time Evolution of Flares in GRB 130925A: Jet Precession in a Black Hole Accretion System
Hou, Shu-Jin; Liu, Tong; Gu, Wei-Min +4 more
GRB 130925A, composed of three gamma-ray emission episodes and a series of orderly flares, has been detected by Swift, Fermi, Konus-Wind, and INTEGRAL. If the third weakest gamma-ray episode can be considered a giant flare, we find that after the second gamma-ray episode observed by INTEGRAL located at about 2000 s, a positive relation exists betw…
The Blue Straggler Star Population in NGC 1261: Evidence for a Post-core-collapse Bounce State
Sills, Alison; Puzia, Thomas H.; Simunovic, Mirko
We present a multi-passband photometric study of the Blue Straggler Star (BSS) population in the Galactic globular cluster (GC) NGC 1261, using available space- and ground-based survey data. The inner BSS population is found to have two distinct sequences in the color-magnitude diagram (CMD), similar to double BSS sequences detected in other GCs. …
Herschel HIFI Observations of O2 toward Orion: Special Conditions for Shock Enhanced Emission
Caselli, Paola; Viti, Serena; Encrenaz, Pierre +18 more
We report observations of molecular oxygen (O2) rotational transitions at 487 GHz, 774 GHz, and 1121 GHz toward Orion Peak A. The O2 lines at 487 GHz and 774 GHz are detected at velocities of 10-12 km s-1 with line widths ~3 km s-1 however, the transition at 1121 GHz is not detected. The observed line ch…
Ultraluminous Infrared Galaxies in the AKARI All-sky Survey
Goto, T.; Doi, Y.; Kilerci Eser, E.
We present a new catalog of 118 ultraluminous infrared galaxies (ULIRGs) and one hyperluminous infrared galaxy (HLIRG) by cross-matching the AKARI all-sky survey with the Sloan Digital Sky Survey Data Release 10 (SDSS DR10) and the final data release of the Two-Degree Field Galaxy Redshift Survey. Forty of the ULIRGs and one HLIRG are new identifi…
Revealing the Location and Structure of the Accretion Disk Wind in PDS 456
Turner, T. J.; Reeves, J. N.; Braito, V. +7 more
We present evidence for the rapid variability of the high-velocity iron K-shell absorption in the nearby (z = 0.184) quasar PDS 456. From a recent long Suzaku observation in 2013 (~1 Ms effective duration), we find that the equivalent width of iron K absorption increases by a factor of ~5 during the observation, increasing from <105 eV within t…
Lupus I Observations from the 2010 Flight of the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry
Ward-Thompson, Derek; Fissel, Laura M.; Savini, Giorgio +29 more
The Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol) was created by adding polarimetric capability to the BLAST experiment that was flown in 2003, 2005, and 2006. BLASTPol inherited BLAST's 1.8 m primary and its Herschel/SPIRE heritage focal plane that allows simultaneous observation at 250, 350, and 500 µm. We…
Supervised Detection of Anomalous Light Curves in Massive Astronomical Catalogs
Kim, Dae-Won; Protopapas, Pavlos; Pichara, Karim +1 more
The development of synoptic sky surveys has led to a massive amount of data for which resources needed for analysis are beyond human capabilities. In order to process this information and to extract all possible knowledge, machine learning techniques become necessary. Here we present a new methodology to automatically discover unknown variable obj…