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Photometric cross-calibration of the SDSS Stripe 82 Standard Stars catalogue with Gaia EDR3, and comparison with Pan-STARRS1, DES, CFIS, and GALEX catalogues
Gwyn, Stephen; Ivezić, Željko; Tucker, Douglas L. +3 more
We extend the SDSS Stripe 82 Standard Stars catalogue with post-2007 SDSS imaging data. This improved version lists averaged SDSS ugriz photometry for nearly a million stars brighter than r ~ 22 mag. With 2-3 times more measurements per star, random errors are 1.4-1.7 times smaller than in the original catalogue, and about three times smaller than…
Systematic Study of Acceleration Efficiency in Young Supernova Remnants with Nonthermal X-Ray Observations
Uchiyama, Yasunobu; Aharonian, Felix; Khangulyan, Dmitry +1 more
Cutoff energy in a synchrotron radiation spectrum of a supernova remnant (SNR) contains a key parameter of ongoing particle acceleration. We systematically analyze 11 young SNRs, including all historical SNRs, to measure the cutoff energy, thus shedding light on the nature of particle acceleration at the early stage of SNR evolution. The nontherma…
Signature of the turbulent component of the solar dynamo on active region scales and its association with flaring activity
Abramenko, Valentina I.
It is a challenging problem to obtain observational evidence of the turbulent component of solar dynamo operating in the convective zone because the dynamo action is hidden below the photosphere. Here we present results of a statistical study of flaring active regions (ARs) that produced strong solar flares of an X-ray class X1.0 and higher during…
The Remnant and Origin of the Historical Supernova 1181 AD
Parker, Quentin A.; Ritter, Andreas; Guerrero, Martín A. +3 more
The guest star of AD 1181 is the only historical supernova of the past millennium that is without a definite counterpart. The previously proposed association with supernova remnant G130.7+3.1 (3C 58) is in strong doubt because of the inferred age of this remnant. Here we report a new identification of SN 1181 with our codiscovery of the hottest kn…
The Architecture of the V892 Tau System: The Binary and Its Circumbinary Disk
Henning, Thomas; Wilner, David J.; Kwon, Woojin +11 more
We present high-resolution millimeter continuum and CO line observations for the circumbinary disk around V892 Tau to constrain the stellar and disk properties. The total mass of the two near-equal-mass A stars is estimated to be 6.0 ± 0.2 M⊙ based on our models of the Keplerian-dominated gas disk rotation. The detection of strong ioniz…
A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology
Li, Gang; Rix, Hans-Walter; Bowman, Dominic M. +12 more
Context. Asteroseismic modelling of the internal structure of main-sequence stars born with a convective core has so far been based on homogeneous analyses of space photometric Kepler light curves of four years in duration, to which most often incomplete inhomogeneously-deduced spectroscopic information was added to break degeneracies.
Aims: …
Whistler waves observed by Solar Orbiter/RPW between 0.5 AU and 1 AU
Maksimovic, M.; Bale, S. D.; Chust, T. +29 more
Context. Solar wind evolution differs from a simple radial expansion, while wave-particle interactions are assumed to be the major cause for the observed dynamics of the electron distribution function. In particular, whistler waves are thought to inhibit the electron heat flux and ensure the diffusion of the field-aligned energetic electrons (Stra…
The velocity dispersion function of early-type galaxies and its redshift evolution: the newest results from lens redshift test
Liu, Yuting; Cao, Shuo; Biesiada, Marek +3 more
The redshift distribution of galactic-scale lensing systems provides a laboratory to probe the velocity dispersion function (VDF) of early-type galaxies (ETGs) and measure the evolution of ETGs at redshift z ~ 1. Through the statistical analysis of the currently largest sample of ETG gravitational lenses, we conclude that the VDF inferred solely f…
Validation of coronal mass ejection arrival-time forecasts by magnetohydrodynamic simulations based on interplanetary scintillation observations
Tokumaru, Munetoshi; Fujiki, Ken'ichi; Shiota, Daikou +3 more
Coronal mass ejections (CMEs) cause various disturbances of the space environment; therefore, forecasting their arrival time is very important. However, forecasting accuracy is hindered by limited CME observations in interplanetary space. This study investigates the accuracy of CME arrival times at the Earth forecasted by three-dimensional (3D) ma…
PSP/IS⊙IS observations of the 29 November 2020 solar energetic particle event
Mitchell, D. G.; McComas, D. J.; Bale, S. D. +24 more
Aims: On 29 November 2020, at 12:34 UT, active region 12790 erupted with an M4.4 class flare and a 1700 km s−1 coronal mass ejection. Parker Solar Probe (PSP) was completing its seventh orbit around the Sun and was located at 0.8 au when the Integrated Science Investigation of the Sun (IS⊙IS) measured the ensuing mid-sized solar en…