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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…
Evolution of the stellar-merger red nova V1309 Scorpii: Spectral energy distribution analysis
Tylenda, R.; Kamiński, T.
Context. One very important object for understanding the nature of red novae is V1309 Sco. Its pre-outburst observations showed that, before its red-nova eruption in 2008, it was a contact binary quickly evolving to the merger of the components. It thus provided us with a direct evidence that the red novae result from stellar mergers.
Aims: W…
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…
Ruling out the light weakly interacting massive particle explanation of the Galactic 511 keV line
Vincent, Aaron C.; Wilkinson, Ryan J.; BÅ`hm, Céline +1 more
Over the past few decades, an anomalous 511 keV gamma-ray line has been observed from the center of the Milky Way. Dark matter (DM) in the form of light (≲10 MeV ) weakly interacting massive particles (WIMPs) annihilating into electron-positron pairs has been one of the leading hypotheses of the observed emission. Given the small required cross se…
Solar cycle variations in the ionosphere of Mars as seen by multiple Mars Express data sets
Pätzold, M.; Lester, M.; Milan, S. E. +11 more
The response of the Martian ionosphere to solar activity is analyzed by taking into account variations in a range of parameters during four phases of the solar cycle throughout 2005-2012. Multiple Mars Express data sets have been used (such as Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) in Active Ionospheric Sounding, MARS…
Kinematic Downsizing at z ∼ 2
Barro, Guillermo; Trump, Jonathan R.; Weiner, Benjamin J. +8 more
We present results from a survey of the internal kinematics of 49 star-forming galaxies at z∼ 2 in the CANDELS fields with the Keck/MOSFIRE spectrograph, Survey in the near-Infrared of Galaxies with Multiple position Angles (SIGMA). Kinematics (rotation velocity V rot and gas velocity dispersion {σ }g) are measured from nebul…
Limits on the LyC signal from z ~ 3 sources with secure redshift and HST coverage in the E-CDFS field
Maccagni, D.; Giavalisco, M.; Thomas, R. +23 more
Context. Determining the strength of the Lyman continuum (LyC) and the fraction of LyC escape have implications for the properties of the emitting sources at any redshift, but also for the re-ionization of the Universe at z > 6.
Aims: We aim to measure the LyC signal from a sample of sources in the Chandra deep field south. We collect star…