Search Publications
SOHO comets: 20 years and 3000 objects later
Knight, Matthew M.; Battams, Karl
We present a summary of the more than 3000 sungrazing and near-Sun comets discovered in coronagraph images returned by the Solar and Heliospheric Observatory (SOHO), since its launch in December 1995. We address each of the four main populations of objects observed by SOHO: Kreutz (sungrazing) group, Meyer group, Marsden and Kracht (96P-family) gr…
Characterization of star-forming dwarf galaxies at 0.1 ≲z ≲ 0.9 in VUDS: probing the low-mass end of the mass-metallicity relation
Maccagni, D.; Schaerer, D.; Castellano, M. +19 more
Context. The study of statistically significant samples of star-forming dwarf galaxies (SFDGs) at different cosmic epochs is essential for the detailed understanding of galaxy assembly and chemical evolution. However, the main properties of this large population of galaxies at intermediate redshift are still poorly known.
Aims: We present the…
Modeling solar energetic particle events using ENLIL heliosphere simulations
Futaana, Y.; Luhmann, J. G.; Odstrcil, D. +9 more
Solar energetic particle (SEP) event modeling has gained renewed attention in part because of the availability of a decade of multipoint measurements from STEREO and L1 spacecraft at 1 AU. These observations are coupled with improving simulations of the geometry and strength of heliospheric shocks obtained by using coronagraph images to send erupt…
Cosmic microwave background constraints for global strings and global monopoles
Lizarraga, Joanes; Urrestilla, Jon; Hindmarsh, Mark +1 more
We present the first cosmic microwave background (CMB) power spectra from numerical simulations of the global O(N) linear σ-model, with N=2,3, which have global strings and monopoles as topological defects. In order to compute the CMB power spectra we compute the unequal time correlators (UETCs) of the energy-momentum tensor, showing that they fal…
Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
Ponti, G.; Dhillon, V. S.; Charles, P. A. +22 more
After more than 26 years in quiescence, the black hole transient V404 Cyg went into a luminous outburst in 2015 June, and additional activity was detected in late December of the same year. Here, we present an optical spectroscopic follow-up of the December mini-outburst, together with X-ray, optical and radio monitoring that spanned more than a m…
Characterizing the Transition from Diffuse Atomic to Dense Molecular Clouds in the Magellanic Clouds with [C II], [C I], and CO
Ott, Jürgen; Hughes, Annie; Wong, Tony +8 more
We present and analyze deep Herschel/HIFI observations of the [C II] 158 µm, [C I] 609 µm, and [C I] 370 µm lines toward 54 lines of sight in the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC). These observations are used to determine the physical conditions of the line-emitting gas, which we use to study the trans…
Observational calibration of the projection factor of Cepheids. III. The long-period Galactic Cepheid RS Puppis
Mérand, Antoine; Bond, Howard E.; Anderson, Richard I. +10 more
The projection factor (p-factor) is an essential component of the classical Baade-Wesselink (BW) technique, which is commonly used to determine the distances to pulsating stars. It is a multiplicative parameter used to convert radial velocities into pulsational velocities. As the BW distances are linearly proportional to the p-factor, its accurate…
Hamilton-Jacobi formalism to warm inflationary scenario
Sayar, K.; Mohammadi, A.; Akhtari, L. +1 more
The Hamilton-Jacobi formalism as a powerful method is being utilized to reconsider the warm inflationary scenario, where the scalar field as the main component driving inflation interacts with other fields. Separating the context into strong and weak dissipative regimes, the goal is followed for two popular functions of Γ . Applying slow-rolling a…
Discerning the Gamma-Ray-emitting Region in the Flat Spectrum Radio Quasars
Zhang, L.; Wang, J. C.; Yang, C. Y. +1 more
A model-dependent method is proposed to determine the location of the γ-ray-emitting region for a given flat spectrum radio quasar (FSRQ). In the model, the extra-relativistic electrons are injected at the base of the jet and non-thermal photons are produced by both synchrotron radiation and inverse-Compton (IC) scattering in the energy dissipatio…
H0LiCOW VII: cosmic evolution of the correlation between black hole mass and host galaxy luminosity
Treu, Tommaso; Auger, Matthew W.; Morishita, Takahiro +8 more
Strongly lensed active galactic nuclei (AGN) provide a unique opportunity to make progress in the study of the evolution of the correlation between the mass of supermassive black holes (M_BH) and their host galaxy luminosity (Lhost). We demonstrate the power of lensing by analysing two systems for which state-of-the-art lens modelling t…