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A search for a keV signature of radiatively decaying dark matter with Suzaku XIS observations of the X-ray diffuse background
Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Sekiya, Norio
We performed the deepest search for an X-ray emission line at between 0.5 and 7 keV from non-baryonic dark matter by the Suzaku XIS. Dark matter associated with the Milky Way was selected as the target to obtain the best signal-to-noise ratio. From the Suzaku archive, we selected 187 data sets of blank-sky regions that were dominated by the X-ray …
Origin of central abundances in the hot intra-cluster medium. II. Chemical enrichment and supernova yield models
Zhang, Y. -Y.; Kaastra, J. S.; Mernier, F. +7 more
The hot intra-cluster medium (ICM) is rich in metals, which are synthesised by supernovae (SNe) and accumulate over time into the deep gravitational potential well of clusters of galaxies. Since most of the elements visible in X-rays are formed by type Ia (SNIa) and/or core-collapse (SNcc) supernovae, measuring their abundances gives us direct inf…
Suprathermal electrons near the nucleus of comet 67P/Churyumov-Gerasimenko at 3 AU: Model comparisons with Rosetta data
Henri, P.; Edberg, N. J. T.; Goldstein, R. +10 more
Observations of the coma near the nucleus of comet 67P/Churyumov-Gerasimenko (67P) made by the IES (Ion and Electron Sensor) instrument onboard the Rosetta Orbiter during late 2014 showed that electron fluxes greatly exceeded solar wind electron fluxes. The IES is part of the Rosetta Plasma Consortium. This paper reports on electron energy spectra…
SN 2015U: a rapidly evolving and luminous Type Ibn supernova
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +7 more
Supernova (SN) 2015U (also known as PSN J07285387+3349106) was discovered in NGC 2388 on 2015 Feb. 11. A rapidly evolving and luminous event, it showed effectively hydrogen-free spectra dominated by relatively narrow helium P-Cygni spectral features and it was classified as an SN Ibn. In this paper, we present photometric, spectroscopic, and spect…
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…