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Sun-to-Earth Characteristics of the 2012 July 12 Coronal Mass Ejection and Associated Geo-effectiveness
Möstl, Christian; Wang, Rui; Yang, Zhongwei +2 more
We analyze multi-spacecraft observations associated with the 2012 July 12 coronal mass ejection (CME), covering the source region on the Sun from the Solar Dynamics Observatory, stereoscopic imaging observations from the Solar Terrestrial Relations Observatory (STEREO), magnetic field characteristics from Mercury Surface, Space Environment, Geoche…
Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey
Terada, Hiroshi; Pyo, Tae-Soo; Oguri, Masamune +12 more
We present the results of an imaging observation campaign conducted with the Subaru Telescope adaptive optics system (IRCS+AO188) on 28 gravitationally lensed quasars and candidates (23 doubles, 1 quad, 1 possible triple, and 3 candidates) from the SDSS Quasar Lens Search. We develop a novel modelling technique that fits analytical and hybrid poin…
Discovery of a faint, star-forming, multiply lensed, Lyman-α blob
Grillo, C.; Balestra, I.; Rosati, P. +7 more
We report the discovery of a multiply lensed Lyman-α blob (LAB) behind the galaxy cluster AS1063 using the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT). The background source is at z = 3.117 and is intrinsically faint compared to almost all previously reported LABs. We used our highly precise strong lensing model to r…
Stellar Populations and Star Formation History of the Metal-poor Dwarf Galaxy DDO 68
Cignoni, M.; Tosi, M.; van der Marel, R. P. +6 more
We present the star formation history (SFH) of the extremely metal-poor dwarf galaxy DDO 68, based on our photometry with the Advanced Camera for Surveys. With a metallicity of only 12+{log}({{O}}/{{H}})=7.15 and a very isolated location, DDO 68 is one of the most metal-poor galaxies known. It has been argued that DDO 68 is a young system that sta…
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…