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Did the progenitor of SN 2011dh have a binary companion?★
Cenko, S. B.; Horesh, A.; Maund, J. R. +6 more
We present late-time Hubble Space Telescope ultraviolet (UV) and optical observations of the site of SN 2011dh in the galaxy M51, ∼1164 days post-explosion. At the supernova (SN) location, we observe a point source that is visible at all wavelengths, which is significantly fainter than the spectral energy distribution (SED) of the yellow supergian…
The dark matter haloes of moderate luminosity X-ray AGN as determined from weak gravitational lensing and host stellar masses
Schramm, Malte; Elvis, Martin; Leauthaud, Alexie +9 more
Understanding the relationship between galaxies hosting active galactic nuclei (AGN) and the dark matter haloes in which they reside is key to constraining how black hole fuelling is triggered and regulated. Previous efforts have relied on simple halo mass estimates inferred from clustering, weak gravitational lensing, or halo occupation distribut…
FIP Bias Evolution in a Decaying Active Region
Long, D. M.; van Driel-Gesztelyi, L.; Démoulin, P. +4 more
Solar coronal plasma composition is typically characterized by first ionization potential (FIP) bias. Using spectra obtained by Hinode’s EUV Imaging Spectrometer instrument, we present a series of large-scale, spatially resolved composition maps of active region (AR)11389. The composition maps show how FIP bias evolves within the decaying AR durin…
The interstellar oxygen crisis, or where have all the oxygen atoms gone?
Wang, Shu; Li, Aigen; Jiang, B. W.
The interstellar medium (ISM) seems to have a significant surplus of oxygen which was dubbed as the `O crisis': independent of the adopted interstellar reference abundance, the total number of O atoms depleted from the gas phase far exceeds that tied up in solids by as much as ∼160 ppm of O/H. Recently, it has been hypothesized that the missing O …
Update of the Venus density and temperature profiles at high altitude measured by SOIR on board Venus Express
Pätzold, M.; Vandaele, A. C.; Robert, S. +10 more
The SOIR instrument on board Venus Express regularly sounds the Venus atmosphere using the solar occultation technique. The density and temperature profiles are inferred from SOIR spectra recorded in the infrared. The method has been described in a previous publication (Mahieux et al., 2012. J. Geophys. Res. 117. doi:10.1029/2012JE004058.). This p…
Revisiting the ISN Flow Parameters, Using a Variable IBEX Pointing Strategy
Wurz, P.; McComas, D. J.; Fuselier, S. A. +8 more
The Interstellar Boundary Explorer (IBEX) has observed the interstellar neutral (ISN) gas flow over the past 6 yr during winter/spring when the Earth’s motion opposes the ISN flow. Since IBEX observes the interstellar atom trajectories near their perihelion, we can use an analytical model based upon orbital mechanics to determine the interstellar …
Long-term monitoring of the archetype Seyfert galaxy MCG-6-30-15: X-ray, optical and near-IR variability of the corona, disc and torus
Uttley, P.; Arévalo, P.; Lira, P. +2 more
We present long-term monitoring of MCG-6-30-15 in X-rays, optical and near-IR wavelengths, collected over 5 yr of monitoring. We determine the power spectrum density of all the observed bands and show that after taking into account the host contamination similar power is observed in the optical and near-IR bands. There is evidence for a correlatio…
Solar Sources of 3He-rich Solar Energetic Particle Events in Solar Cycle 24
Nitta, Nariaki V.; Mason, Glenn M.; Wang, Linghua +2 more
Using high-cadence EUV images obtained by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, we investigate the solar sources of 26 3He-rich solar energetic particle events at ≲1 MeV nucleon-1 that were well-observed by the Advanced Composition Explorer during solar cycle 24. Identification of the…
Calibration of the AKARI far-infrared all-sky survey maps
Nakagawa, Takao; Doi, Yasuo; Takita, Satoshi +10 more
We present an initial analysis of the properties of an all-sky image obtained by the Far-Infrared Surveyor (FIS) onboard the AKARI satellite, at 65 µm (N60), 90 µm (WIDE-S), 140 µm (WIDE-L), and 160 µm (N160). An absolute flux calibration was determined by comparing the data with COBE/DIRBE data sets; the intensity range wa…
Galactic cold cores. IV. Cold submillimetre sources: catalogue and statistical analysis
Bernard, J. -P.; Falgarone, E.; Juvela, M. +17 more
Context. For the project Galactic cold cores, Herschel photometric observations were carried out as a follow-up of cold regions of interstellar clouds previously identified with the Planck satellite. The aim of the project is to derive the physical properties of the population of cold sources and to study its connection to ongoing and future star …