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A mini outburst from the nightside of comet 67P/Churyumov-Gerasimenko observed by the OSIRIS camera on Rosetta
Jorda, L.; Lara, L. M.; Lamy, P. +40 more
Context. On 12 March 2015 the OSIRIS WAC camera onboard the ESA Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko observed a small outburst originating from the Imhotep region at the foot of the big lobe of the comet. These measurements are unique since it was the first time that the initial phase of a transient outburst event could be d…
Spectral Properties of Large Gradual Solar Energetic Particle Events. I. Fe, O, and Seed Material
Cohen, C. M. S.; Mewaldt, R. A.; Schwadron, N. A. +7 more
We have surveyed ∼0.1-100 MeV nucleon-1 O and Fe fluence spectra during 46 isolated, large gradual SEP events observed at ACE during solar cycles 23 and 24. Most SEP spectra are well represented by the four-parameter Band function with a normalization constant, low-energy spectral slope, high-energy spectral slope, and break energy. The…
NGC 6362: The Least Massive Globular Cluster with Chemically Distinct Multiple Populations
Dalessandro, Emanuele; Salaris, Maurizio; Mucciarelli, Alessio +6 more
We present the first measure of Fe and Na abundances in NGC 6362, a low-mass globular cluster (GC) where first- and second-generation stars are fully spatially mixed. A total of 160 member stars (along the red giant branch (RGB) and the red horizontal branch (RHB)) were observed with the multi-object spectrograph FLAMES at the Very Large Telescope…
Probing the 2D temperature structure of protoplanetary disks with Herschel observations of high-J CO lines
Fedele, D.; van Dishoeck, E. F.; Bruderer, S. +2 more
The gas temperature structure of protoplanetary disks is a key ingredient for interpreting various disk observations and for quantifying the subsequent evolution of these systems. The comparison of low- and mid-J CO rotational lines is a powerful tool for assessing the temperature gradient in the warm molecular layer of disks. Spectrally resolved …
CMB constraint on dark matter annihilation after Planck 2015
Nakayama, Kazunori; Kawasaki, Masahiro; Sekiguchi, Toyokazu
We update the constraint on the dark matter annihilation cross section by using the recent measurements of the CMB anisotropy by the Planck satellite. We fully calculate the cascade of dark matter annihilation products and their effects on ionization, heating and excitation of the hydrogen, hence do not rely on any assumption on the energy fractio…
A possible Chandra and Hubble Space Telescope detection of extragalactic WHIM towards PG 1116+215
Bonamente, M.; Tempel, E.; Nevalainen, J. +4 more
We have analysed Chandra low energy transmission grating and XMM-Newton Reflection Grating Spectrometer (RGS) spectra towards the z = 0.177 quasar PG 1116+215, a sightline that is rendered particularly interesting by the Hubble Space Telescope (HST) detection of several O VI and H I broad Lyman α absorption (BLA) lines that may be associated with …
How Lyman Alpha Emission Depends on Galaxy Stellar Mass
Finkelstein, Steven L.; Blanc, Guillermo A.; Oyarzún, Grecco A. +6 more
In this work, we show how the stellar mass (M *) of galaxies affects the 3 < z < 4.6 Lyα equivalent width (EW) distribution. To this end, we design a sample of 629 galaxies in the M * range 7.6\lt {log}{M}*/{M}⊙ \lt 10.6 from the 3D-HST/CANDELS survey. We perform spectroscopic observations of this …
SWIFT view of the 2015 outburst of GS 2023+338 (V404 Cyg): complex evolution of spectral and temporal characteristics
Nandi, A.; Mandal, S.; Agrawal, V. K. +1 more
We study the spectral and temporal characteristics of the source GS 2023+338 (V404 Cyg) during the initial phase of its 2015 June outburst, over the energy range of 0.5-150 keV. This is the first detailed study of the characteristics of this source based on SWIFT observations, being reported. Based on our analysis, we understand that the source ex…
Studying the evolution of AGB stars in the Gaia epoch
Di Criscienzo, M.; Dell'Agli, F.; Ventura, P. +6 more
We present asymptotic giant branch (AGB) models of solar metallicity, to allow the interpretation of observations of Galactic AGB stars, whose distances should be soon available after the first release of the Gaia catalogue. We find an abrupt change in the AGB physical and chemical properties, occurring at the threshold mass to ignite hot bottom b…
The Case for PSR J1614-2230 as a NICER Target
Miller, M. Coleman
The Neutron star Interior Composition ExploreR (NICER) is expected to launch in 2017 and will gather X-ray data on neutron stars and other high-energy sources from a berth on the International Space Station. Its prime scientific goal is to measure the masses and radii of non-accreting neutron stars via fits to the energy-dependent waveforms produc…