Search Publications
Multiwavelength afterglow emission from bursts associated with magnetar flares and fast radio bursts
Murase, Kohta; Wei, Yujia; Zhang, B. Theodore
Magnetars have been considered as progenitors of magnetar giant flares (MGFs) and fast radio bursts (FRBs). We present detailed studies on afterglow emissions caused by bursts that occur in their wind nebulae and surrounding baryonic ejecta. In particular, following the bursts-in-bubble model, we analytically and numerically calculate spectra and …
Fleeting Small-scale Surface Magnetic Fields Build the Quiet-Sun Corona
Woch, J.; Peter, H.; Chitta, L. P. +19 more
Arch-like loop structures filled with million Kelvin hot plasma form the building blocks of the quiet-Sun corona. Both high-resolution observations and magnetoconvection simulations show the ubiquitous presence of magnetic fields on the solar surface on small spatial scales of ~100 km. However, the question of how exactly these quiet-Sun coronal l…
Discovery of magnetospheric interactions in the doubly magnetic hot binary ϵ Lupi
Wade, Gregg A.; Biswas, Ayan; Chandra, Poonam +6 more
Magnetic fields are extremely rare in close, hot binaries, with only 1.5 per cent of such systems known to contain a magnetic star. The eccentric ϵ Lupi system stands out in this population as the only close binary in which both stars are known to be magnetic. We report the discovery of strong variable radio emission from ϵ Lupi using the upgraded…
Effect of the initial mass function on the dynamical SMBH mass estimate in the nucleated early-type galaxy FCC 47
Fahrion, Katja; van de Ven, Glenn; Nguyen, Dieu D. +4 more
Supermassive black holes (SMBHs) and nuclear star clusters (NSCs) co-exist in many galaxies. While the formation history of the black hole is essentially lost, NSCs preserve their evolutionary history imprinted onto their stellar populations and kinematics. Studying SMBHs and NSCs in tandem might help us to ultimately reveal the build-up of galaxy…
Near-infrared characterization of ultra-diffuse galaxies in Abell 2744 by JWST/NIRISS imaging
Acebron, Ana; Trenti, Michele; Vulcani, Benedetta +10 more
We present a search and characterization of ultra-diffuse galaxies (UDGs) in the Frontier Fields cluster Abell 2744 at $z$ = 0.308. We use JWST/NIRISS F200W observations, acquired as part of the GLASS-JWST Early Release Science programme, aiming to characterize morphologies of cluster UDGs and their diffuse stellar components. A total number of 22…
Atmospheric Parameters and Kinematic Information for the M Giant Stars from LAMOST DR9
Qiu, Dan; Tian, Hao; Yang, Ming +5 more
A catalog of more than 43,000 M giant stars has been selected by Li et al. from the ninth data release of LAMOST. Using the data-driven method SLAM, we obtain the stellar parameters (T eff, $\mathrm{log}\,g$ , [M/H], [α/M]) for all the M giant stars with uncertainties of 57 K, 0.25 dex, 0.16 dex and 0.06 dex at SNR > 100, respectivel…
Temporal albedo variability in the phase curve of KELT-1b
Parviainen, H.
The dayside brightness spectrum of a highly irradiated transiting brown dwarf KELT-1b is challenging to explain based on current brown dwarf atmosphere models. The spectrum has been measured from observations spanning ten years and covering high-precision secondary eclipses and phase curves from space in blue-visible (CHaracterising ExOPlanet Sate…
Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA). SDSS J1608+2716: A Subarcsecond Quadruply Lensed Quasar at z = 2.575
Shen, Yue; Oguri, Masamune; Zakamska, Nadia L. +5 more
We report Hubble Space Telescope (HST) Wide Field Camera 3 deep IR (F160W) imaging of SDSS J1608+2716. This system, located at a redshift of z = 2.575, was recently reported as a triple-quasar candidate with subarcsecond separations (~0.″25) based on selection from Gaia astrometry and follow-up Keck adaptive optics-assisted integral field unit spe…
Accounting for differential rotation in calculations of the Sun's angular momentum-loss rate
Brun, A. S.; Finley, A. J.
Context. Sun-like stars shed angular momentum due to the presence of magnetised stellar winds. Magnetohydrodynamic models have been successful in exploring the dependence of this `wind-braking torque' on various stellar properties; however the influence of surface differential rotation is largely unexplored. As the wind-braking torque depends on t…
The JWST view of the barred galaxy population in the SMACS0723 galaxy cluster
Costantin, L.; Méndez-Abreu, J.; Kruk, S.
Context. The cosmic evolution of the barred galaxy population provides key information about the secular evolution of galaxies and the settling of rotationally dominated discs.
Aims: We study the bar fraction in the SMACSJ0723.37323 (SMACS0723) cluster of galaxies at z = 0.39 using the Early Release Observations obtained with the NIRCam instr…