Search Publications
The white dwarf binary pathways survey - I. A sample of FGK stars with white dwarf companions
Gänsicke, B. T.; Rebassa-Mansergas, A.; Parsons, S. G. +3 more
The number of spatially unresolved white dwarf plus main-sequence star binaries has increased rapidly in the last decade, jumping from only ∼30 in 2003 to over 3000. However, in the majority of known systems the companion to the white dwarf is a low-mass M dwarf, since these are relatively easy to identify from optical colours and spectra. White d…
The Ellipticity Distribution of Ambiguously Blended Objects
Dawson, William A.; Tyson, J. Anthony; Schneider, Michael D. +1 more
Using overlapping fields with space-based Hubble Space Telescope and ground-based Subaru Telescope imaging we identify a population of blended galaxies that are blended to such a large degree that they are detected as single objects in the ground-based monochromatic imaging, which we label “ambiguous blends.” For deep imaging data, such as the dep…
Daily global mapping of Mars ozone column abundances with MARCI UV band imaging
Smith, Michael D.; Wolff, Michael J.; Lefèvre, Franck +3 more
Since November of 2006, The Mars Color Imager (MARCI) onboard the Mars Reconnaissance Orbiter (MRO) has obtained multiple-filter daily global images of Mars centered upon a local time (LT) of 3 pm. Ultraviolet imaging bands placed within (260 nm) and longward (320 nm) of Hartley band (240-300 nm) ozone (O3) absorption support retrievals…
Strong gravitational lensing and the stellar IMF of early-type galaxies
Charlot, Stéphane; Saha, Prasenjit; Bruzual, Gustavo +3 more
Systematic variations of the initial mass function (IMF) in early-type galaxies, and their connection with possible drivers such as velocity dispersion or metallicity, have been much debated in recent years. Strong lensing over galaxy scales combined with photometric and spectroscopic data provides a powerful method to constrain the stellar mass-t…
The Structure of the Circumgalactic Medium of Galaxies: Cool Accretion Inflow Around NGC 1097
Frye, Brenda L.; Bowen, David V.; Tripp, Todd M. +4 more
We present Hubble Space Telescope far-UV spectra of four QSOs whose sightlines pass through the halo of NGC 1097 at impact parameters of ρ = 48-165 kpc. NGC 1097 is a nearby spiral galaxy that has undergone at least two minor merger events, but no apparent major mergers, and is relatively isolated with respect to other nearby bright galaxies. This…
Scaling Relations in Coronal Mass Ejections and Energetic Proton Events Associated with Solar Superflares
Shibata, Kazunari; Takahashi, Takuya; Mizuno, Yoshiyuki
In order to discuss the potential impact of solar “superflares” on space weather, we investigated statistical relations among energetic proton peak flux with energy higher than 10 MeV (F p ), CME speed near the Sun (V CME) obtained by Solar and Heliospheric Observatory/LASCO coronagraph, and flare soft X-ray peak flux in the…
Hard X-ray emission of the luminous infrared galaxy NGC 6240 as observed by NuSTAR
Harrison, F. A.; Stern, D.; Alexander, D. M. +23 more
We present a broadband (~0.3-70 keV) spectral and temporal analysis of NuSTAR observations of the luminous infrared galaxy NGC 6240 combined with archival Chandra, XMM-Newton, and BeppoSAX data. NGC 6240 is a galaxy in a relatively early merger state with two distinct nuclei separated by ~1.̋5. Previous Chandra observations resolved the two nuclei …
Optical Identification of Cepheids in 19 Host Galaxies of Type Ia Supernovae and NGC 4258 with the Hubble Space Telescope
Casertano, Stefano; Filippenko, Alexei V.; Foley, Ryan J. +10 more
We present results of an optical search conducted as part of the SH0ES project (Supernovae and H0 for the Equation of State of dark energy) for Cepheid variable stars using the Hubble Space Telescope (HST) in 19 hosts of Type Ia supernovae (SNe Ia) and the maser-host galaxy NGC 4258. The targets include nine newly imaged SN Ia hosts usi…
Chandra Counterparts of CANDELS GOODS-S Sources
Elbaz, D.; Shu, X.; Ferguson, H. C. +18 more
Improving the capabilities of detecting faint X-ray sources is fundamental for increasing the statistics on faint high-z active galactic nuclei (AGNs) and star-forming galaxies (SFGs). We performed a simultaneous maximum likelihood point-spread function fit in the [0.5-2] keV and [2-7] keV energy bands of the 4 Ms Chandra Deep Field South (CDFS) d…
Spectral Properties of Large Gradual Solar Energetic Particle Events. II. Systematic Q/M Dependence of Heavy Ion Spectral Breaks
McComas, D. J.; Cohen, C. M. S.; Mewaldt, R. A. +7 more
We fit ∼0.1-500 MeV nucleon-1 H-Fe spectra in 46 large solar energetic particle (SEP) events with the double power-law Band function to obtain a normalization constant, low- and high-energy parameters γ a and γ b, and break energy E B, and derive the low-energy spectral slope γ 1. We find that…