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Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst
Altamirano, D.; Bailyn, C. D.; Özbey Arabacı, M. +3 more
We present results from quasi-simultaneous multiwavelength observations of the Galactic black hole X-ray transient MAXI J1820+070 during the decay of the 2018 outburst and its entire subsequent mini-outburst in March 2019. We fit the X-ray spectra with phenomenological and Comptonizaton models and discuss the X-ray spectral evolution in comparison…
The Early History of Heliospheric Science and the Spacecraft That Made It Possible
Krimigis, S. M.; Möbius, E.; Richardson, J. D. +8 more
Our understanding of the interaction of the large-scale heliosphere with the local interstellar medium (LISM) has undergone a profound change since the very earliest analyses of the problem. In part, the revisions have been a consequence of ever-improving and widening observational results, especially those that identified the entrance of interste…
Nine Bright γ Doradus Variables Discovered with Ground-based Photometry
Henry, Gregory W.; Williamson, Michael H.; Fekel, Francis C.
We have used precise photometric and high-dispersion spectroscopic observations to study nine candidate γ Doradus (γ Dor) stars, identified as optically variable comparison stars in our photometric studies of Sun-like stars. In this paper, we confirm these nine candidates as new γ Dor variables. All exhibit sinusoidal variability with amplitudes b…
γ-Ray Emission from Classical Nova V392 Per: Measurements from Fermi and HAWC
Lee, W. H.; Alvarez, C.; Hernandez, S. +89 more
This paper reports on the γ-ray properties of the 2018 Galactic nova V392 Per, spanning photon energies ~0.1 GeV-100 TeV by combining observations from the Fermi Gamma-ray Space Telescope and the HAWC Observatory. As one of the most rapidly evolving γ-ray signals yet observed for a nova, GeV γ-rays with a power-law spectrum with an index Γ = 2.0 ±…
The Fast Radio Burst-emitting Magnetar SGR 1935+2154-Proper Motion and Variability from Long-term Hubble Space Telescope Monitoring
Lyman, J. D.; Kouveliotou, C.; Fruchter, A. S. +3 more
We present deep Hubble Space Telescope (HST) near-infrared (NIR) observations of the magnetar SGR 1935+2154 from 2021 June, approximately 6 yr after the first HST observations, a year after the discovery of fast-radio-burst-like emission from the source, and in a period of exceptional high-frequency activity. Although not directly taken during a b…
Stellar Populations of Lyα-emitting Galaxies in the HETDEX Survey. I. An Analysis of LAEs in the GOODS-N Field
Finkelstein, Steven L.; Leung, Gene C. K.; Jung, Intae +17 more
We present the results of a stellar population analysis of 72 Lyα-emitting galaxies (LAEs) in GOODS-N at 1.9 < z < 3.5 spectroscopically identified by the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). We provide a method for connecting emission-line detections from the blind spectroscopic survey to imaging counterparts, a crucial t…
Low-frequency Radio Continuum Imaging and SED Modeling of 11 LIRGs: Radio-only and FUV to Radio Bands
Małek, Katarzyna; Charmandaris, Vassilis; Seymour, Nicholas +5 more
We present a detailed analysis of 11 local luminous infrared galaxies from ultraviolet through far-infrared to radio (~70 MHz to ~15 GHz) bands. We derive the astrophysical properties through spectral energy distribution (SED) modeling using the Code Investigating GALaxy Emission (CIGALE) and UltraNest codes. The radio SEDs include our new observa…
Observational evidence for two-component distributions describing solar magnetic bright points
Utz, Dominik; Gömöry, Peter; Kuckein, Christoph +6 more
Context. High-resolution observations of the solar photosphere reveal the presence of fine structures, in particular the so-called Magnetic Bright Points (MBPs), which are small-scale features associated with strong magnetic field regions of the order of kilogauss (kG). It is especially relevant to study these magnetic elements, which are extensiv…
Dust in and Around the Heliosphere and Astrospheres
Slavin, Jonathan D.; Draine, Bruce T.; Lallement, Rosine +7 more
Interstellar dust particles were discovered in situ, in the solar system, with the Ulysses mission's dust detector in 1992. Ever since, more interstellar dust particles have been measured inside the solar system by various missions, providing insight into not only the composition of such far-away visitors, but also in their dynamics and interactio…
Diagnosing the Optically Thick/Thin Features Using the Intensity Ratio of Si IV Resonance Lines in Solar Flares
Ding, M. D.; Li, Y.; Hong, Jie +1 more
In the optically thin regime, the intensity ratio of the two Si IV resonance lines (1394 and 1403 Å) are theoretically the same as the ratio of their oscillator strengths, which is exactly 2. Here, we study the ratio of the integrated intensity of the Si IV lines (R = ∫I 1394(λ)dλ/∫I 1403(λ)dλ) and the ratio of intensity at e…