Search Publications
Discrepancies between CFHTLenS cosmic shear and Planck: new physics or systematic effects?
Verde, Licia; Jimenez, Raul; Kitching, Thomas D. +1 more
There is currently a discrepancy in the measured value of the amplitude of matter clustering, parametrized using σ8, inferred from galaxy weak lensing, and cosmic microwave background (CMB) data, which could be an indication of new physics, such as massive neutrinos or a modification to the gravity law, or baryon feedback. In this paper…
The temporal evolution of exposed water ice-rich areas on the surface of 67P/Churyumov-Gerasimenko: spectral analysis
Mottola, S.; Barucci, M. A.; Kappel, D. +16 more
Water ice-rich patches have been detected on the surface of comet 67P/Churyumov-Gerasimenko by the VIRTIS (Visible InfraRed and Thermal Imaging Spectrometer) hyperspectral imager on board the Rosetta spacecraft, since the orbital insertion in late 2014 August. Among these, three icy patches have been selected, and VIRTIS data are used to analyse t…
Lensing convergence and the neutrino mass scale in galaxy redshift surveys
Kunz, Martin; Durrer, Ruth; Cardona, Wilmar +1 more
We demonstrate the importance of including the lensing contribution in galaxy clustering analyses with large galaxy redshift surveys. It is well known that radial cross-correlations between different redshift bins of galaxy surveys are dominated by lensing. But we show here that also neglecting lensing in the autocorrelations within one bin severe…
Confirming the Existence of a Quiescent Galaxy Population out to z=3: A Stacking Analysis of Mid-, Far-Infrared and Radio Data
Casey, Caitlin M.; Schinnerer, Eva; Zirm, Andrew W. +15 more
We performed a comprehensive stacking analysis on ∼14,200 quiescent galaxy (QG) candidates at z = 0-3 across mid-, far-infrared (MIR and FIR), and radio wavelengths. Identified via their rest-frame NUV - r and r - J colors, the QG candidates ({M}\star ={10}9.8{{{--}}12.2} {M}⊙ ) have drastically different IR and ra…
The Age, Mass, and Size Distributions of Star Clusters in M51
Schinnerer, Eva; Whitmore, Bradley C.; Chandar, Rupali +4 more
We present a new catalog of 3816 compact star clusters in the grand design spiral galaxy M51 based on observations taken with the Hubble Space Telescope. The age distribution of the clusters declines starting at very young ages, and can be represented by a power law, {dN}/dτ \propto {τ }γ , with γ =-0.65+/- 0.15. No significant changes …
Globular Cluster Systems in Brightest Cluster Galaxies. II. NGC 6166
Whitmore, Bradley C.; Blakeslee, John P.; Rothberg, Barry +3 more
We present new deep photometry of the globular cluster system (GCS) around NGC 6166, the central supergiant galaxy in Abell 2199. Hubble Space Telescope data from the Advanced Camera for Surveys and WFC3 cameras in F475W and F814W are used to determine the spatial distribution of the GCS, its metallicity distribution function (MDF), and the depend…
Electron heating in the exhaust of magnetic reconnection with negligible guide field
Guo, Ruilong; Chen, Li-Jen; Kistler, Lynn M. +3 more
Electron heating in the magnetic reconnection exhaust is investigated with particle-in-cell simulations, space observations, and theoretical analysis. Spatial variations of the electron temperature (Te) and associated velocity distribution functions (VDFs) are examined and understood in terms of particle energization and randomization p…
67P/C-G inner coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun
Lamy, P. L.; Fulle, M.; Rodrigo, R. +36 more
GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure the momentum, mass and speed of individual dust particles escaping the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter 67P). From 2014 August to 2016 June, Rosetta escorted comet 67P during its journey around the Sun. Here, we focus on …
Flare vs. Shock Acceleration of High-energy Protons in Solar Energetic Particle Events
Cliver, E. W.
Recent studies have presented evidence for a significant to dominant role for a flare-resident acceleration process for high-energy protons in large (“gradual”) solar energetic particle (SEP) events, contrary to the more generally held view that such protons are primarily accelerated at shock waves driven by coronal mass ejections (CMEs). The new …
The Detection of a Hot Molecular Core in the Large Magellanic Cloud with ALMA
Onaka, Takashi; Aikawa, Yuri; Shimonishi, Takashi +1 more
We report the first detection of a hot molecular core outside our Galaxy based on radio observations with ALMA toward a high-mass young stellar object (YSO) in a nearby low metallicity galaxy, the Large Magellanic Cloud (LMC). Molecular emission lines of CO, C17O, HCO+, H13CO+, H2CO, NO, SiO, …