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The Cause of the Weak Solar Cycle 24
Schüssler, M.; Jiang, J.; Cameron, R. H.
The ongoing 11 year cycle of solar activity is considerably less vigorous than the three cycles before. It was preceded by a very deep activity minimum with a low polar magnetic flux, the source of the toroidal field responsible for solar magnetic activity in the subsequent cycle. Simulation of the evolution of the solar surface field shows that t…
Compton thick AGN in the XMM-COSMOS survey
Berta, S.; Pozzi, F.; Georgakakis, A. +27 more
Heavily obscured, Compton thick (CT, NH> 1024 cm-2) active galactic nuclei (AGN) may represent an important phase in AGN/galaxy co-evolution and are expected to provide a significant contribution to the cosmic X-ray background at its peak. However, unambiguously identifying CT AGN beyond the local Universe is a …
Relation between fine structure of energy spectra for pulsating aurora electrons and frequency spectra of whistler mode chorus waves
Asamura, K.; Santolik, O.; Ebihara, Y. +10 more
We investigate the origin of the fine structure of the energy spectrum of precipitating electrons for the pulsating aurora (PsA) observed by the low-altitude Reimei satellite. The Reimei satellite achieved simultaneous observations of the optical images and precipitating electrons of the PsA from satellite altitude (~620 km) with resolution of 40 …
Calibrating the cosmic distance scale ladder: the role of the sound-horizon scale and the local expansion rate as distance anchors
Verde, Licia; Riess, Adam; Jimenez, Raul +1 more
We exploit cosmological model-independent measurements of the expansion history of the Universe to provide a cosmic distance ladder. These are supernovae Type Ia used as standard candles (at redshift between 0.01 and 1.3) and baryon acoustic oscillations (at redshifts between 0.1 and 0.8) as standard rulers. We calibrate (anchor) the ladder in two…
Faint dwarfs as a test of DM models: WDM versus CDM
Mayer, L.; Behroozi, P.; Madau, P. +12 more
We use high-resolution Hydro+N-Body cosmological simulations to compare the assembly and evolution of a small field dwarf (stellar mass ∼106-7 M⊙, total mass 1010 M⊙) in Λ-dominated cold dark matter (CDM) and 2 keV warm dark matter (WDM) cosmologies. We find that star formation (SF) in the WDM model is r…
A remarkable recurrent nova in M31: Discovery and optical/UV observations of the predicted 2014 eruption
Ness, J. -U.; Henze, M.; Hernanz, M. +20 more
The Andromeda Galaxy recurrent nova M31N 2008-12a had been caught in eruption eight times. The inter-eruption period of M31N 2008-12a is ~1 yr, making it the most rapidly recurring system known, and a strong single-degenerate Type Ia supernova progenitor candidate. Following the 2013 eruption, a campaign was initiated to detect the predicted 2014 …
The Atacama Cosmology Telescope: Lensing of CMB Temperature and Polarization Derived from Cosmic Infrared Background Cross-correlation
Hilton, Matt; Hasselfield, Matthew; Bond, J. Richard +49 more
We present a measurement of the gravitational lensing of the Cosmic Microwave Background (CMB) temperature and polarization fields obtained by cross-correlating the reconstructed convergence signal from the first season of Atacama Cosmology Telescope Polarimeter data at 146 GHz with Cosmic Infrared Background (CIB) fluctuations measured using the …
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters: The Internal Kinematics of the Multiple Stellar Populations in NGC 2808
Anderson, J.; Milone, A. P.; Marino, A. F. +9 more
Numerous observational studies have revealed the ubiquitous presence of multiple stellar populations in globular clusters and cast many difficult challenges for the study of the formation and dynamical history of these stellar systems. In this Letter we present the results of a study of the kinematic properties of multiple populations in NGC 2808 …
Planck intermediate results. XXVII. High-redshift infrared galaxy overdensity candidates and lensed sources discovered by Planck and confirmed by Herschel-SPIRE
Kneissl, R.; Altieri, B.; Le Floc'h, E. +183 more
We have used the Planck all-sky submillimetre and millimetre maps to search for rare sources distinguished by extreme brightness, a few hundred millijanskies, and their potential for being situated at high redshift. These "cold" Planck sources, selected using the High Frequency Instrument (HFI) directly from the maps and from the Planck Catalogue …
The evolution of the cold interstellar medium in galaxies following a starburst
da Cunha, E.; Nesvadba, N.; Mortier, A. +4 more
We present the evolution of dust and molecular gas properties in a sample of 11 z ∼ 0.03 starburst to post-starburst (PSB) galaxies selected to span an age sequence from ongoing starburst to 1 Gyr after the starburst ended. All PSBs harbour significant molecular gas and dust reservoirs and residual star formation, indicating that complete quenchin…