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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…
Changing the Bayesian prior: Absolute neutrino mass constraints in nonlocal gravity*
Dirian, Yves
Prior change is discussed in observational constraints studies of nonlocally modified gravity, where a model characterized by a modification of the form ∼m2R □-2R to the Einstein-Hilbert action was compared against the base Λ CDM one in a Bayesian way. It was found that the competing modified gravity model is significantly di…
Characterization of the Inner Disk around HD 141569 A from Keck/NIRC2 L-Band Vortex Coronagraphy
Matthews, Keith; Milli, Julien; Pinte, Christophe +22 more
HD 141569 A is a pre-main sequence B9.5 Ve star surrounded by a prominent and complex circumstellar disk, likely still in a transition stage from protoplanetary to debris disk phase. Here, we present a new image of the third inner disk component of HD 141569 A made in the L‧ band (3.8 µm) during the commissioning of the vector vortex coronag…
Gravitationally lensed quasars in Gaia: I. Resolving small-separation lenses
McMahon, Richard G.; Auger, Matthew W.; Koposov, Sergey E. +1 more
Gaia's exceptional resolution (FWHM ∼ 0.1 arcsec) allows identification and cataloguing of the multiple images of gravitationally lensed quasars. We investigate a sample of 49 known lensed quasars in the Sloan Digital Sky Survey (SDSS) footprint, with image separations less than 2 arcsec, and find that eight are detected with multiple components i…
New constraints on the disk characteristics and companion candidates around T Chamaeleontis with VLT/SPHERE
Pinte, C.; Ménard, F.; Ginski, C. +34 more
Context. The transition disk around the T Tauri star T Cha possesses a large gap, making it a prime target for high-resolution imaging in the context of planet formation.
Aims: We aim to find signs of disk evolutionary processes by studying the disk geometry and the dust grain properties at its surface, and to search for companion candidates.…
New Evidence for a Coronal Mass Ejection-driven High Frequency Type II Burst near the Sun
Kumari, Anshu; Ramesh, R.; Kathiravan, C. +1 more
We report observations of the high frequency type II radio burst (≈430-30 MHz) that occurred in the solar corona on 2015 November 4. The drift rate of the burst, estimated close to the start frequency of its fundamental component (≈215 MHz), is unusually high (≈2 MHz s-1). Our analysis shows that the estimated speed of the magnetohydrod…
The SLUGGS Survey: A Catalog of Over 4000 Globular Cluster Radial Velocities in 27 Nearby Early-type Galaxies
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +10 more
Here, we present positions and radial velocities for over 4000 globular clusters (GCs) in 27 nearby early-type galaxies from the SLUGGS survey. The SLUGGS survey is designed to be representative of elliptical and lenticular galaxies in the stellar mass range 10 < log {M}* /M ⊙ < 11.7. The data have been obtained over ma…