Search Publications
Comprehensive Analysis of a Filament-embedding Solar Active Region at Different Stages of Evolution
Li, Hui; Su, Yang; Li, Chuan +9 more
Active regions are the brightest structures seen in the solar corona, so their physical properties hold important clues to the physical mechanisms underlying coronal heating. In this work, we present a comprehensive study for a filament-embedding active region as determined from observations from multiple facilities including the Chinese Hα Solar …
The debiased morphological transformations of galaxies since z = 3 in CANDELS
Demarco, R.; Cerulo, P.; Salvador, D. +3 more
Context. Morphological quantitative measurements and visual-like classifications are susceptible to biases arising from the expansion of the Universe. One of these biases is the effect of cosmological surface brightness dimming (CSBD): the measured surface brightness of a galaxy decays with redshift as (1 + z)−4. This effect might lead …
The Components of Cepheid Systems: The FN Vel System
Mérand, Antoine; Evans, Nancy Remage; Anderson, Richard I. +8 more
Cepheid masses continue to be important tests of evolutionary tracks for intermediate-mass stars as well as important predictors of their future fate. For systems where the secondary is a B star, Hubble Space Telescope ultraviolet spectra have been obtained. From these spectra a temperature can be derived, and from this a mass of the companion M <…
Cosmological constraints from type-I radio-loud quasars
Chang, N.; Huang, L.; Tu, Z. Y. +3 more
We obtain a sample of 1192 type-I quasars with the UV-optical, radio, and x-ray waveband coverage, which combined with the data from Huang and Chang [Mon. Not. R. Astron. Soc. 515, 1358 (2022), 10.1093/mnras/stac1451] and other matching objects of SDSS-DR16 with FIRST, XMM-Newton, and Chandra Source Catalog, and a sample of 407 flat-spectrum radio…
Center-to-limb Variations in Solar Plage Using IRIS Observations
Young, Peter R.; Kayshap, Pradeep
The center-to-limb variations (CLV) of transition region line Gaussian fit parameters in solar plage are reported for the first time. The Si IV 1402.77 Å line observed by the Interface Region Imaging Spectrograph is used. The spectral intensity increases linearly from the disk center to the solar limb. Similarly, the nonthermal velocity also incre…
A Centiparsec-scale Compact Radio Core in the Nearby Galaxy M60
Yang, Jun; Liao, Mai; Dou, Liming +7 more
M60, an elliptical galaxy located 16.5 Mpc away, has an active nucleus with a very low luminosity and an extremely low accretion rate. Its central supermassive black hole (SMBH) has a mass of M BH ~ 4.5 × 109 M ⊙ and a Schwarzschild radius corresponding to R S ~ 5.4 µas. To investigate the nature o…
H2CO, O3, NH3, HCN, N2O, NO2, NO, and HO2 upper limits of detection in the Venus lower-mesosphere using SOIR on board Venus Express
Aoki, S.; Vandaele, A. C.; Trompet, L. +6 more
We report on mean upper limit number densities and volume concentrations of H2CO, O3, NH3, HCN, N2O, NO2, NO, and HO2 at the Venus terminator above the cloud layer, computed from the SOIR/Venus Express transmittances measured during hundreds of solar occultations. An unsuccessful at…
First Determination in the Extended Corona of the 2D Thermal Evolution of a Current Sheet after a Solar Eruption
Susino, Roberto; Fineschi, Silvano; Stangalini, Marco +26 more
For the first time the evolution of the coronal reconfiguration after a coronal mass ejection (CME) was observed by the multichannel Metis Coronagraph on board the ESA–Solar Orbiter mission. The images acquired in visible light (VL) between 3.0 and 5.4 R ⊙ show the formation after a CME of a bright elongated radial feature interpreted a…
AGN STORM 2. VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations
Kaspi, Shai; Filippenko, Alexei V.; Barth, Aaron J. +39 more
We observed the Seyfert 1 galaxy Mrk 817 during an intensive multiwavelength reverberation mapping campaign for 16 months. Here, we examine the behavior of narrow UV absorption lines seen in the Hubble Space Telescope/Cosmic Origins Spectrograph spectra, both during the campaign and in other epochs extending over 14 yr. We conclude that, while the…
Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720 b, TOI-6008 b, and TOI-6086 b
Tamura, M.; Pallé, E.; Hirano, T. +53 more
One of the main goals of the NASA Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of Earth-like planets around nearby M-dwarf stars. We present the discovery and validation of three new short-period Earth-sized planets orbiting nearby M dwarfs: TOI-5720 b, TOI-6008 b, and TOI-6086 b. We combined TESS data, ground-based multic…