Search Publications
Bidirectional Fluxes of Nearly Relativistic Electrons During the Onset of Solar Energetic Particle Events
Li, C.; Sun, L. P.
We report intensity and anisotropy measurements of energetic electrons in the energy range of ~27-~500 keV as observed with the Wind and Advanced Composition Explorer (ACE) spacecraft in 2000 June for several solar energetic particle (SEP) events. The solar sources of the SEP events are inferred from observations from the Solar and Heliospheric Ob…
Analysis of a State Changing Supersoft X-Ray Source in M31
Nelson, T.; Patel, B.; Di Stefano, R. +3 more
We report on observations of a luminous supersoft X-ray source (SSS) in M31, r1-25, that has exhibited spectral changes to harder X-ray states. We document these spectral changes. In addition, we show that they have important implications for modeling the source. Quasisoft states in a source that has been observed as an SSS represent a newly disco…
Missing Lensed Images and the Galaxy Disk Mass in CXOCY J220132.8-320144
Schechter, Paul L.; Maza, José; Chen, Jacqueline +2 more
The CXOCY J220132.8-320144 system consists of an edge-on spiral galaxy lensing a background quasar into two bright images. Previous efforts to constrain the mass distribution in the galaxy have suggested that at least one additional image must be present. These extra images may be hidden behind the disk which features a prominent dust lane. We pre…
Erratum: "Discovery of a Giant Radio Halo in a New Planck Galaxy Cluster PLCKG171.9-40.7" (2013, ApJ, 766, 18)
Wik, Daniel R.; Giacintucci, Simona; Venturi, Tiziana +2 more
The Onset of Differentiation and Internal Evolution: The Case of 21 Lutetia
Capaccioni, F.; De Sanctis, M. C.; Turrini, D. +2 more
Asteroid 21 Lutetia, seen by the Rosetta spacecraft, plays a crucial role in the reconstruction of primordial phases of planetary objects. Its high bulk density and its primitive chondritic crust suggest that Lutetia could be partially differentiated. We developed a numerical code, also used for studying the geophysical history of Vesta, to explor…
The Hubble Space Telescope Cluster Supernova Survey. V. Improving the Dark-energy Constraints above z > 1 and Building an Early-type-hosted Supernova Sample
Gladders, M. D.; Panagia, N.; Stern, D. +63 more
We present Advanced Camera for Surveys, NICMOS, and Keck adaptive-optics-assisted photometry of 20 Type Ia supernovae (SNe Ia) from the Hubble Space Telescope (HST) Cluster Supernova Survey. The SNe Ia were discovered over the redshift interval 0.623 < z < 1.415. Of these SNe Ia, 14 pass our strict selection cuts and are used in combination …
Mid-infrared Selection of Active Galactic Nuclei with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-selected Active Galactic Nuclei in COSMOS
Tsai, Chao-Wei; Dey, Arjun; Griffith, Roger L. +15 more
The Wide-field Infrared Survey Explorer (WISE) is an extremely capable and efficient black hole finder. We present a simple mid-infrared color criterion, W1 - W2 >= 0.8 (i.e., [3.4]-[4.6] >=0.8, Vega), which identifies 61.9 ± 5.4 active galactic nucleus (AGN) candidates per deg2 to a depth of W2 ~ 15.0. This implies a much larger …
Detection and Characterization of Exoplanets and Disks Using Projections on Karhunen-Loève Eigenimages
Pueyo, Laurent; Soummer, Rémi; Larkin, James
We describe a new method to achieve point-spread function (PSF) subtractions for high-contrast imaging using principal component analysis that is applicable to both point sources or extended objects (disks). Assuming a library of reference PSFs, a Karhunen-Loève transform of these references is used to create an orthogonal basis of eigenimages on …
Stellar Diameters and Temperatures. II. Main-sequence K- and M-stars
López-Morales, Mercedes; Muirhead, Philip S.; Kane, Stephen R. +21 more
We present interferometric angular diameter measurements of 21 low-mass, K- and M-dwarfs made with the CHARA Array. This sample is enhanced by adding a collection of radius measurements published in the literature to form a total data set of 33 K-M-dwarfs with diameters measured to better than 5%. We use these data in combination with the Hipparco…
New Constraints on the Evolution of the Stellar-to-dark Matter Connection: A Combined Analysis of Galaxy-Galaxy Lensing, Clustering, and Stellar Mass Functions from z = 0.2 to z =1
Koekemoer, Anton M.; Schrabback, Tim; Leauthaud, Alexie +20 more
Using data from the COSMOS survey, we perform the first joint analysis of galaxy-galaxy weak lensing, galaxy spatial clustering, and galaxy number densities. Carefully accounting for sample variance and for scatter between stellar and halo mass, we model all three observables simultaneously using a novel and self-consistent theoretical framework. …