Search Publications
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…
Planck intermediate results. XL. The Sunyaev-Zeldovich signal from the Virgo cluster
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +202 more
The Virgo cluster is the largest Sunyaev-Zeldovich (SZ) source in the sky, both in terms of angular size and total integrated flux. Planck's wide angular scale and frequency coverage, together with its high sensitivity, enable a detailed study of this big object through the SZ effect. Virgo is well resolved by Planck, showing an elongated structur…
Solar wind interaction with comet 67P: Impacts of corotating interaction regions
Glassmeier, K. -H.; Nilsson, H.; Henri, P. +18 more
We present observations from the Rosetta Plasma Consortium of the effects of stormy solar wind on comet 67P/Churyumov-Gerasimenko. Four corotating interaction regions (CIRs), where the first event has possibly merged with a coronal mass ejection, are traced from Earth via Mars (using Mars Express and Mars Atmosphere and Volatile EvolutioN mission)…
Giant scattering cones in obscured quasars
Zakamska, Nadia L.; Wylezalek, Dominika; Obied, Georges +1 more
We analyse Hubble Space Telescope observations of scattering regions in 20 luminous obscured quasars at 0.24 < z < 0.65 (11 new observations and nine archival ones) observed at rest frame ∼3000 Å. We find spectacular 5-10 kpc-scale scattering regions in almost all cases. The median scattering efficiency at this wavelength (the ratio of obser…
Updated measurements of the dark matter halo masses of obscured quasars with improved WISE and Planck data
Hickox, R. C.; DiPompeo, M. A.; Myers, A. D.
Using the most recent releases of WISE and Planck data, we perform updated measurements of the bias and typical dark matter halo mass of infrared (IR)-selected obscured and unobscured quasars, using the angular autocorrelation function and cosmic microwave background lensing cross-correlations. Since our recent work of this kind, the WISE ALLWISE …