Search Publications
Probing the Outskirts of the Early-Stage Galaxy Cluster Merger A1750
Sarazin, Craig L.; Bayliss, Matthew; Andrade-Santos, Felipe +12 more
We present results from recent Suzaku and Chandra X-ray and Multiple Mirrior Telescope optical observations of the strongly merging “double cluster” A1750 out to its virial radius, both along and perpendicular to a putative large-scale structure filament. Some previous studies of individual clusters have found evidence for ICM entropy profiles tha…
On the Composition of Young, Directly Imaged Giant Planets
Fortney, J. J.; Zahnle, K.; Moses, J. I. +6 more
The past decade has seen significant progress on the direct detection and characterization of young, self-luminous giant planets at wide orbital separations from their host stars. Some of these planets show evidence for disequilibrium processes like transport-induced quenching in their atmospheres; photochemistry may also be important, despite the…
The Contribution of Host Galaxies to the Infrared Energy Output of z ≳ 5.0 Quasars
Lyu, Jianwei; Alberts, Stacey; Rieke, G. H.
The infrared spectral energy distributions of z ≳ 5 quasars can be reproduced by combining a low-metallicity galaxy template with a standard active galactic nucleus (AGN) template. The host galaxy is represented by Haro 11, a compact, moderately low metallicity, starbursting galaxy that shares typical features of high-z galaxies. For the vast majo…
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…
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…
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…
A Protosolar Nebula Origin for the Ices Agglomerated by Comet 67P/Churyumov-Gerasimenko
Wurz, P.; Altwegg, K.; Bieler, A. +10 more
The nature of the icy material accreted by comets during their formation in the outer regions of the protosolar nebula (PSN) is a major open question in planetary science. Some scenarios of comet formation predict that these bodies agglomerated from crystalline ices condensed in the PSN. Concurrently, alternative scenarios suggest that comets accr…