Search Publications
BBN and the CMB constrain neutrino coupled light WIMPs
Nollett, Kenneth M.; Steigman, Gary
In the presence of a light weakly interacting massive particle (WIMP) with mass mχ≲30 MeV , there are degeneracies among the nature of the WIMP (fermion or boson), its couplings to the standard model particles (to electrons, positrons, and photons, or only to neutrinos), its mass mχ, and the number of equivalent (additional) …
The Kiloparsec-scale Star Formation Law at Redshift 4: Widespread, Highly Efficient Star Formation in the Dust-obscured Starburst Galaxy GN20
Daddi, E.; Walter, F.; Dannerbauer, H. +4 more
We present high-resolution observations of the 880 µm (rest-frame FIR) continuum emission in the z = 4.05 submillimeter galaxy GN20 from the IRAM Plateau de Bure Interferometer (PdBI). These data resolve the obscured star formation (SF) in this unlensed galaxy on scales of 0.''3 × 0.''2 (~2.1 × 1.3 kpc). The observations reveal a bright (16 …
Effect of UV Radiation on the Spectral Fingerprints of Earth-like Planets Orbiting M Stars
Kaltenegger, L.; Rugheimer, S.; Segura, A. +2 more
We model the atmospheres and spectra of Earth-like planets orbiting the entire grid of M dwarfs for active and inactive stellar models with Teff = 2300 K to Teff = 3800 K and for six observed MUSCLES M dwarfs with UV radiation data. We set the Earth-like planets at the 1 AU equivalent distance and show spectra from the visibl…
New constraints on f(R) gravity from clusters of galaxies
Kelly, Patrick L.; Allen, Steven W.; Rapetti, David +6 more
The abundance of massive galaxy clusters is a powerful probe of departures from general relativity (GR) on cosmic scales. Despite current stringent constraints placed by stellar and galactic tests, on larger scales alternative theories of gravity such as f(R) can still work as effective theories. Here we present constraints on two popular models o…
Relationship between Solar Energetic Particles and Properties of Flares and CMEs: Statistical Analysis of Solar Cycle 23 Events
Dalla, S.; Malandraki, O.; Tziotziou, K. +5 more
A statistical analysis of the relationship between solar energetic particles (SEPs) and properties of solar flares and coronal mass ejections (CMEs) is presented. SEP events during Solar Cycle 23 are selected that are associated with solar flares originating in the visible hemisphere of the Sun and that are at least of magnitude M1. Taking into ac…
Chains of dense cores in the Taurus L1495/B213 complex
Tafalla, M.; Hacar, A.
Context. Cloud fragmentation into dense cores is a critical step in the process of star formation. A number of recent observations show that it is connected to the filamentary structure of the gas, but the processes responsible for core formation remain mysterious.
Aims: We studied the kinematics and spatial distribution of the dense gas in t…
The Suzaku view of highly ionized outflows in AGN - II. Location, energetics and scalings with bolometric luminosity
Cappi, M.; Turner, T. J.; Tombesi, F. +4 more
Ongoing studies with XMM-Newton have shown that powerful accretion disc winds, as revealed through highly ionized Fe K-shell absorption at E ≥ 6.7 keV, are present in a significant fraction of active galactic nuclei (AGNs) in the local Universe (Tombesi et al. 2010a). In Gofford et al., we analysed a sample of 51 Suzaku-observed AGNs and independe…
Planck intermediate results. XX. Comparison of polarized thermal emission from Galactic dust with simulations of MHD turbulence
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +186 more
Polarized emission observed by Planck HFI at 353 GHz towards a sample of nearby fields is presented, focusing on the statistics of polarization fractions p and angles ψ. The polarization fractions and column densities in these nearby fields are representative of the range of values obtained over the whole sky. We find that: (i) the largest polariz…
The Atmospheric Circulation of the Hot Jupiter WASP-43b: Comparing Three-dimensional Models to Spectrophotometric Data
Fortney, Jonathan J.; Stevenson, Kevin B.; Kataria, Tiffany +5 more
The hot Jupiter WASP-43b (2 MJ , 1 RJ , T orb = 19.5 hr) has now joined the ranks of transiting hot Jupiters HD 189733b and HD 209458b as an exoplanet with a large array of observational constraints. Because WASP-43b receives a similar stellar flux as HD 209458b but has a rotation rate four times faster and a highe…
Ultra-large-scale Cosmology in Next-generation Experiments with Single Tracers
Alonso, David; Maartens, Roy; Bull, Philip +2 more
Future surveys of large-scale structure will be able to measure perturbations on the scale of the cosmological horizon, and so could potentially probe a number of novel relativistic effects that are negligibly small on sub-horizon scales. These effects leave distinctive signatures in the power spectra of clustering observables and, if measurable, …