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Photometric behaviour of 67P/Churyumov-Gerasimenko and analysis of its pre-perihelion diurnal variations
Mottola, S.; Erard, S.; Capaccioni, F. +14 more
Spectral parameters measured by the Rosetta/VIRTIS imaging spectrometer on the nucleus of comet 67P/Churyumov-Gerasimenko were studied as a function of incidence, emission and phase angles. A statistical analysis was undertaken for a number of spectral parameters: reflectance at seven wavelengths (0.55, 0.75, 1.2, 1.7, 2.0, 2.8 and 4.0 µm), …
Cool and hot emission in a recurring active region jet
Del Zanna, Giulio; Mulay, Sargam M.; Mason, Helen
Aims: We present a thorough investigation of the cool and hot temperature components in four recurring active region jets observed on July 10, 2015 using the Atmospheric Imaging Assembly (AIA), X-ray Telescope (XRT), and Interface Region Imaging Spectrograph (IRIS) instruments.
Methods: A differential emission measure (DEM) analysis was …
HST/WFC3 observations of Uranus' 2014 storm clouds and comparison with VLT/SINFONI and IRTF/Spex observations
Wong, Michael H.; Irwin, Patrick G. J.; Orton, G. S. +2 more
In November 2014 Uranus was observed with the Wide Field Camera 3 (WFC3) instrument of the Hubble Space Telescope as part of the Hubble 2020: Outer Planet Atmospheres Legacy program, OPAL. OPAL annually maps Jupiter, Uranus and Neptune (and will also map Saturn from 2018) in several visible/near-infrared wavelength filters. The Uranus 2014 OPAL ob…
Seasonal Changes in Hydrogen Escape From Mars Through Analysis of HST Observations of the Martian Exosphere Near Perihelion
Villanueva, G. L.; Bertaux, J. L.; Clarke, J. T. +5 more
Hubble Space Telescope (HST) observations of the Martian hydrogen exosphere in Lyman α are presented in this paper for a period when Mars passed perihelion and southern summer solstice in its orbit. The peak intensity in the exospheric Lyman α brightness was recorded after Mars went past its perihelion, slightly after southern summer solstice. The…
A strongly truncated inner accretion disc in the Rapid Burster
Degenaar, N.; Fabian, A. C.; van den Eijnden, J. +4 more
The neutron star (NS) low-mass X-ray binary (LMXB) the Rapid Burster (RB; MXB 1730-335) uniquely shows both Type I and Type II X-ray bursts. The origin of the latter is ill-understood but has been linked to magnetospheric gating of the accretion flow. We present a spectral analysis of simultaneous Swift, NuSTAR and XMM-Newton observations of the R…
Pressure Profiles of Distant Galaxy Clusters in the Planck Catalogue
Bourdin, H.; Mazzotta, P.; Vikhlinin, A. +2 more
Successive releases of Planck data have demonstrated the strength of the Sunyaev-Zeldovich (SZ) effect in detecting hot baryons out to the galaxy cluster peripheries. To infer the hot gas pressure structure from nearby galaxy clusters to more distant objects, we developed a parametric method that models the spectral energy distribution and spatial…
Diffuse Interstellar Bands and the Ultraviolet Extinction Curves: The Missing Link Revisited
Li, Aigen; Xiang, F. Y.; Zhong, J. X.
A large number of interstellar absorption features at ∼4000 Å-1.8 µm, known as the “diffuse interstellar bands” (DIBs), remains unidentified. Most recent works relate them to large polycyclic aromatic hydrocarbon (PAH) molecules or ultrasmall carbonaceous grains which are also thought to be responsible for the 2175 \mathringA extinction bump…
Uniform Contribution of Supernova Explosions to the Chemical Enrichment of Abell 3112 out to R 200
Miller, Eric D.; Bulbul, Esra; Smith, Randall K. +5 more
The spatial distribution of the metals residing in the intra-cluster medium (ICM) of galaxy clusters records all the information on a cluster’s nucleosynthesis and chemical enrichment history. We present measurements from a total of 1.2 Ms Suzaku XIS and 72 ks Chandra observations of the cool-core galaxy cluster Abell 3112 out to its virial radius…
Star Formation Activity in the Molecular Cloud G35.20-0.74: Onset of Cloud-Cloud Collision
Dewangan, L. K.
To probe star formation (SF) processes, we present results of an analysis of the molecular cloud G35.20-0.74 (hereafter MCG35.2) using multi-frequency observations. The MCG35.2 is depicted in a velocity range of 30-40 km s-1. An almost horseshoe-like structure embedded within the MCG35.2 is evident in the infrared and millimeter images …
Testing predictions of the quantum landscape multiverse 1: the Starobinsky inflationary potential
Di Valentino, Eleonora; Mersini-Houghton, Laura
The 2015 Planck data release has placed tight constraints on the allowed class of inflationary models. The current data favors concave downwards inflationary potentials while offering interesting hints on possible deviations from the standard picture of CMB perturbations. We here test the predictions of the theory of the origin of the universe fro…