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Galactic rotation curve and dark matter according to gravitomagnetism
Ludwig, G. O.
Historically, the existence of dark matter has been postulated to resolve discrepancies between astrophysical observations and accepted theories of gravity. In particular, the measured rotation curve of galaxies provided much experimental support to the dark matter concept. However, most theories used to explain the rotation curve have been restri…
The evolution of the size-mass relation at z = 1-3 derived from the complete Hubble Frontier Fields data set
Treu, Tommaso; Bradač, Maruša; Birrer, Simon +3 more
We measure the size-mass relation and its evolution between redshifts 1 < z < 3, using galaxies lensed by six foreground Hubble Frontier Fields clusters. The power afforded by strong gravitation lensing allows us to observe galaxies with higher angular resolution beyond current facilities. We select a stellar mass limited sample and divide t…
Late-time acceleration due to a generic modification of gravity and the Hubble tension
Gangopadhyay, Mayukh R.; Sami, M.; Sharma, Mohit K. +1 more
We consider a scenario of modified gravity, which is generic to late-time acceleration, namely, acceleration in the Jordan frame and no acceleration in the Einstein frame. The possibility is realized by assuming an interaction between dark matter and the baryonic component in the Einstein frame which is removed by going to the Jordan frame using a…
TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full-frame Images
Henning, Thomas; Barclay, Thomas; Vanderburg, Andrew +115 more
We present the discovery and characterization of five hot and warm Jupiters—TOI-628 b (TIC 281408474; HD 288842), TOI-640 b (TIC 147977348), TOI-1333 b (TIC 395171208, BD+47 3521A), TOI-1478 b (TIC 409794137), and TOI-1601 b (TIC 139375960)—based on data from NASA's Transiting Exoplanet Survey Satellite (TESS). The five planets were identified fro…
Evolution of the Thermodynamic Properties of Clusters of Galaxies out to Redshift of 1.8
Mahler, Guillaume; Kraft, Ralph; Khullar, Gourav +11 more
The thermodynamic properties of the hot plasma in galaxy clusters retain information on the processes leading to the formation and evolution of the gas in their deep, dark matter potential wells. These processes are dictated not only by gravity but also by gas physics, e.g., active galactic nucleus feedback and turbulence. In this work, we study t…
The Mass-Metallicity Relation at z 1-2 and Its Dependence on the Star Formation Rate
Papovich, Casey; Barro, Guillermo; Martin, Crystal L. +24 more
We present a new measurement of the gas-phase mass-metallicity relation (MZR) and its dependence on star formation rates (SFRs) at 1.3 < z < 2.3. Our sample comprises 1056 galaxies with a mean redshift of z = 1.9, identified from the Hubble Space Telescope Wide Field Camera 3 (WFC3) grism spectroscopy in the Cosmic Assembly Near-infrared Dee…
Gemini/GMOS optical transmission spectroscopy of WASP-121b: signs of variability in an ultra-hot Jupiter?
Nikolov, Nikolay; de Mooij, Ernst J. W.; Gibson, Neale P. +5 more
We present ground-based, spectroscopic observations of two transits of the ultra-hot Jupiter WASP-121b covering the wavelength range ≈500-950 nm using Gemini/GMOS. We use a Gaussian process framework to model instrumental systematics in the light curves, and also demonstrate the use of the more generalized Student's-T process to verify our results…
X-ray flux in SED modelling: An application of X-CIGALE in the XMM-XXL field
Ciesla, L.; Buat, V.; Boquien, M. +3 more
X-CIGALE is built on the spectral energy distribution (SED) code of CIGALE and implements important new features: the code accounts for obscuring material in the poles of AGNs and has the ability to fit X-ray fluxes. In this work, we used ∼2500 spectroscopic X-ray AGNs from the XMM-XXL-north field and examined the improvements the new features bri…
The kinematics of globular cluster populations in the E-MOSAICS simulations and their implications for the assembly history of the Milky Way
Kruijssen, J. M. Diederik; Trujillo-Gomez, Sebastian; Crain, Robert A. +5 more
We present a detailed comparison of the Milky Way (MW) globular cluster (GC) kinematics with the 25 MW-mass cosmological simulations from the E-MOSAICS project. While the MW falls within the kinematic distribution of GCs spanned by the simulations, the relative kinematics of its metal-rich ( $[\rm {Fe}/\rm {H}] \gt -1.2$ ) versus metal-poor ( $[\r…
Impacts of Ionospheric Ions on Magnetic Reconnection and Earth's Magnetosphere Dynamics
Lavraud, B.; André, M.; Kistler, L. M. +13 more
Ionospheric ions (mainly H+, He+, and O+) escape from the ionosphere and populate the Earth's magnetosphere. Their thermal energies are usually low when they first escape the ionosphere, typically a few electron volt to tens of electron volt, but they are energized in their journey through the magnetosphere. The io…