Search Publications
Missions
Journals
Publication Years
µ distortions or running: A guaranteed discovery from CMB spectrometry
Melchiorri, Alessandro; Cabass, Giovanni; Pajer, Enrico
We discuss the implications of a PIXIE-like experiment, which would measure µ -type spectral distortions of the cosmic microwave background (CMB) at a level of σµ=(1 /n )×10-8 , with n ≥1 representing an improved sensitivity (e.g. n =10 corresponds to PRISM). Using Planck data and considering the six-parameter Λ C…
Discrete sources of cryovolcanism on the nucleus of Comet 29P/Schwassmann-Wachmann and their origin
Miles, Richard
Evidence for long-lived sources of cryovolcanism on the nucleus of the Comet 29P/Schwassmann-Wachmann has been found from a study of its times of outburst (t0) and the morphological development of inner coma structures. Analysis of data from the Minor Planet Center observations archive spanning 2002-2014 and other observations have yiel…
Ultra-deep K S-band Imaging of the Hubble Frontier Fields
Fontana, Adriano; Muzzin, Adam; Labbé, Ivo +16 more
We present an overview of the “KIFF” project, which provides ultra-deep K s -band imaging of all six of the Hubble Frontier Fields clusters, Abell 2744, MACS-0416, Abell S1063, Abell 370, MACS-0717, and MACS-1149. All of these fields have recently been observed with large allocations of Directors’ Discretionary Time with the Hubble and…
Characteristics of north jovian aurora from STIS FUV spectral images
Bonfond, B.; Nichols, J. D.; Ray, L. C. +4 more
We analyzed two observations obtained in Jan. 2013, consisting of spatial scans of the jovian north ultraviolet aurora with the HST Space Telescope Imaging Spectrograph (STIS) in the spectroscopic mode. The color ratio (CR) method, which relates the wavelength-dependent absorption of the FUV spectra to the mean energy of the precipitating electron…
First evidence of non-Gaussian solar flare EUV spectral line profiles and accelerated non-thermal ion motion
Fletcher, Lyndsay; Jeffrey, Natasha L. S.; Labrosse, Nicolas
Context. The properties of solar flare plasma can be determined from the observation of optically thin lines. The emitting ion distribution determines the shape of the spectral line profile, with an isothermal Maxwellian ion distribution producing a Gaussian profile. Non-Gaussian line profiles may indicate more complex ion distributions.
Aims…
Slow electrostatic solitary waves in Earth's plasma sheet boundary layer
Fazakerley, Andrew; Omura, Yoshiharu; Anekallu, Chandrasekhar +3 more
We modeled Cluster spacecraft observations of slow electrostatic solitary waves (SESWs) in the Earth's northern plasma sheet boundary layer (PSBL) region on the basis of nonlinear fluid theory and fluid simulation. Various plasma parameters observed by the Cluster satellite at the time of the SESWs were examined to investigate the generation proce…
The mosaic multiple stellar populations in ω Centauri: the horizontal branch and the main sequence
Di Criscienzo, M.; D'Antona, F.; Tailo, M. +2 more
We interpret the stellar population of ω Centauri by means of a population synthesis analysis, following the most recent observational guidelines for input metallicities, helium and [(C+N+O)/Fe] contents. We deal at the same time with the main sequences, sub-giant and horizontal branch (HB) data. The reproduction of the observed colour-magnitude f…
Deep Chandra observation and numerical studies of the nearest cluster cold front in the sky
Simionescu, A.; Fabian, A. C.; Markevitch, M. +9 more
We present the results of a very deep (500 ks) Chandra observation, along with tailored numerical simulations, of the nearest, best resolved cluster cold front in the sky, which lies 90 kpc (19 arcmin) to the north-west of M 87. The northern part of the front appears the sharpest, with a width smaller than 2.5 kpc (1.5 Coulomb mean free paths; at …
Formation of downstream high-speed jets by a rippled nonstationary quasi-parallel shock: 2-D hybrid simulations
Lu, Q.; Lembege, B.; Hao, Y. +1 more
Experimental observations from space missions (including more recently Cluster and Time History of Events and Macroscale Interactions during Substorms data) have clearly revealed the existence of high-speed jets (HSJs) in the downstream region of the quasi-parallel terrestrial bow shock. Presently, two-dimensional hybrid simulations are performed …
Herschel protocluster survey: a search for dusty star-forming galaxies in protoclusters at z = 2-3
Lehmer, B. D.; Smail, Ian; Alexander, D. M. +15 more
We present a Herschel/Spectral and Photometric Imaging Receiver (SPIRE) survey of three protoclusters at z = 2-3 (2QZCluster, HS1700, SSA22). Based on the SPIRE colours (S350/S250 and S500/S350) of 250 µm sources, we selected high-redshift dusty star-forming galaxies potentially associated with the…