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Four bright eclipsing binaries with γ Doradus pulsating components: CM Lac, MZ Lac, RX Dra, and V2077 Cyg
Van Reeth, Timothy; Southworth, John
The study of pulsating stars in eclipsing binaries holds the promise of combining two different ways of measuring the physical properties of a star to obtain improved constraints on stellar theory. Gravity (g) mode pulsations such as those found in γ Doradus stars can be used to probe rotational profiles, mixing, and magnetic fields. Until recentl…
Probing vainsthein-screening gravity with galaxy clusters using internal kinematics and strong and weak lensing
Umetsu, Keiichi; Pizzuti, Lorenzo; Saltas, Ippocratis D. +1 more
We use high-precision combined strong/weak lensing and kinematics measurements of the total mass profiles of the observed galaxy clusters MACS J1206.2-0847 and Abell S1063, to constrain the relativistic sector of the general DHOST dark energy theories, which exhibit a partial breaking of the so called Vainsthein screening mechanism, on the linear …
Constraints on the Galactic Centre environment from Gaia hypervelocity stars II: The evolved population
Rossi, E. M.; Marchetti, T.; Evans, F. A.
A dynamical encounter between a stellar binary and Sgr A* in the Galactic Centre (GC) can tidally separate the binary and eject one member with a velocity beyond the escape speed of the Milky Way. These hypervelocity stars (HVSs) can offer insight into the stellar populations in the GC environment. In a previous work, our simulations showed that t…
Influence of the Gaia-Sausage-Enceladus on the Density Shape of the Galactic Stellar Halo Revealed by Halo K Giants from the LAMOST Survey
Zhao, Gang; Yang, Chengqun; Pei, Wenxiang +2 more
We present a study of the influence of the Gaia-Sausage-Enceladus (GSE) on the density shape of the Galactic stellar halo using 11,624 K giants from the LAMOST survey. Every star is assigned a probability of being a member of the GSE based on its spherical velocities and metallicity by a Gaussian mixture model. We divide the stellar halo into two …
UV and X-ray pulse amplitude variability in the transitional millisecond pulsar PSR J1023+0038
D'Avanzo, P.; Campana, S.; Stella, L. +7 more
The transitional millisecond pulsar PSR J1023+0038 is the first millisecond pulsar discovered to emit UV and optical pulses. Here we present the results of the UV and X-ray phase-resolved timing analysis of observations performed with the Hubble Space Telescope, XMM-Newton, and NuSTAR satellites between 2014 and 2021. Ultraviolet pulsations are de…
Concordance between Observations and Simulations in the Evolution of the Mass Relation between Supermassive Black Holes and Their Host Galaxies
Treu, Tommaso; Bhowmick, Aklant K.; Blecha, Laura +7 more
We carry out a comparative analysis of the relation between the mass of supermassive black holes (BHs) and the stellar mass of their host galaxies at 0.2 < z < 1.7 using well-matched observations and multiple state-of-the-art simulations (e.g., MassiveBlackII, Horizon-AGN, Illustris, TNG, and a semianalytic model). The observed sample consis…
Searching for Compact Objects in Binaries with Gaia DR3
Liu, Jifeng; Gu, Wei-Min; Yi, Tuan +4 more
We search for compact objects in binaries based on Gaia DR3. A sample of 10 targets is derived under the following conditions: the radial velocity variable, low temperature (T eff < 6000 K), high mass function (f(M 2) > 1M ⊙), and ellipsoidal-like light curves. Two targets have LAMOST spectroscopic observatio…
Multiwavelength properties of 850-µm selected sources from the North Ecliptic Pole SCUBA-2 survey
Goto, Tomotsugu; Kim, Seong Jin; Conselice, Christopher J. +25 more
We present the multiwavelength counterparts of 850-$\mu$m selected submillimetre sources over a 2-deg2 field centred on the North Ecliptic Pole. In order to overcome the large beam size (15 arcsec) of the 850-$\mu$m images, deep optical to near-infrared (NIR) photometric data and arcsecond-resolution 20-cm images are used to identify co…
Synthetic solar cycle for active regions violating the Hale's polarity law
Abramenko, V.; Sokoloff, D.; Zhukova, A. +1 more
Long observational series for bipolar active regions (ARs) provide significant information about the mutual transformation of the poloidal and toroidal components of the global solar magnetic field. The direction of the toroidal field determines the polarity of leading sunspots in ARs in accordance with the Hale's polarity law. The vast majority o…
The MURALES survey. VI. Properties and origin of the extended line emission structures in radio galaxies
Marconi, A.; Capetti, A.; Gilli, R. +11 more
This is the sixth paper presenting the results of the MUse RAdio Loud Emission line Snapshot survey. We observed 37 radio sources from the 3C sample with z < 0.3 and a declination < 20° with the Multi Unit Spectroscopic Explorer optical integral field spectrograph at the Very Large Telescope. Here, we focus on the properties of the extended …