Search Publications
Detecting the Oscillation and Propagation of the Nascent Dynamic Solar Wind Structure at 2.6 Solar Radii Using Very Long Baseline Interferometry Radio Telescopes
He, Jiansen; Venturi, Tiziana; Zhang, Peijin +30 more
Probing the solar corona is crucial to study the coronal heating and solar wind acceleration. However, the transient and inhomogeneous solar wind flows carry large-amplitude inherent Alfvén waves and turbulence, which make detection more difficult. We report the oscillation and propagation of the solar wind at 2.6 solar radii (Rs) by observation o…
Does the Lockstep Growth between Black Holes and Bulges Create Their Mass Relation?
Papovich, Casey; Yang, Guang; Brandt, W. N. +7 more
Recent studies have revealed a strong relation between the sample-averaged black hole (BH) accretion rate (BHAR) and star formation rate (SFR) among bulge-dominated galaxies-i.e., "lockstep" BH-bulge growth-in the distant universe. This relation might be closely connected to the BH-bulge mass correlation observed in the local universe. To further …
The 2020 Eclipse of R Aquarii in the Near-infrared: Mid-eclipse Observations of Disk Distress
Fekel, Francis C.; Hinkle, Kenneth H.; Lebzelter, Thomas +2 more
The Mira in the bright, dusty, symbiotic binary R Aquarii undergoes eclipses of multiyear duration every ~44 yr by a large, opaque accretion disk. The 2020 eclipse was confirmed by I-band photometry. High-resolution M- and K-band spectra were observed near the midpoint of the eclipse, in 2020 August and September. The 4.5-5.5 µm spectrum dur…
Star Formation Triggered by the Expanding Bubble S111
Mookerjea, Bhaswati
This paper investigates the impact of radiative and mechanical feedback from O-type stars on their parent molecular clouds and the triggering of formation of a future generation of stars. We study the infrared bubble S111 created by the embedded massive stellar cluster G316.80-0.05. A significant fraction of gas in shells created due to the compre…
Formation of Coronal Mass Ejection and Posteruption Flow of Solar Wind on 2010 August 18 Event
Slemzin, Vladimir; Goryaev, Farid; Rodkin, Denis
The state of the space environment plays a significant role in the forecasting of geomagnetic storms produced by disturbances of the solar wind (SW). Coronal mass ejections (CMEs) passing through the heliosphere often have a prolonged (up to several days) trail with declining speed, which affects propagation of the subsequent SW streams. We studie…
The Impact of Inclination-dependent Attenuation on Ultraviolet Star Formation Rate Tracers
Basu-Zych, Antara; Garofali, Kristen; Lehmer, Bret D. +3 more
We examine and quantify how hybrid (e.g., UV+IR) star formation rate (SFR) estimators and the A FUV-β relation depend on inclination for disk-dominated galaxies using spectral energy distribution modeling that utilizes the inclination-dependent attenuation curves described in Doore et al. We perform this analysis on a sample of 133 disk…
Spatial Distribution and Low-frequency Disturbance Modulation of Magnetosheath Ion Polytropic Index
Cao, Jinbin; Pang, Xuexia; Geng, Xiyao +6 more
We, using the Cluster data from 2001 to 2010, studied spatial distribution of the ion polytropic index in the magnetosheath, and the modulation of polytropic process by the low-frequency disturbances (4-18 mHz). The total of 30,3283 samples is divided into two sorts: quasi-perpendicular and quasi-parallel propagating ones. The median polytropic in…
On the Nature of the Photospheric Horizontal Magnetic Field Increase in Major Solar Flares
Wang, Yuming; Sun, Xudong; Liu, Lijuan +2 more
The rapid increase of the horizontal magnetic field (B h ) around the flaring polarity inversion line is the most prominent photospheric field change during flares. It is considered to be caused by the contraction of flare loops, the details behind which is still not fully understood. Here we investigate the B h increase i…
A New Approach to Kinetic Energy Flux at the Different Frequencies above the IRIS Bright Points
Tavabi, Ehsan; Sadeghi, Rayhane
Various bright structures abound in the chromosphere playing an essential role in the dynamics and evolution therein. Tentatively identifying the wave characteristics in the outer solar atmosphere helps to understand this layer better. One of the most significant aspects of these characteristics is the wave phase speed (PS), which is a dominant co…
The Wind Temperature and Mass-loss Rate of Arcturus (K1.5 III)
Ayres, Thomas R.; Harper, Graham M.; O'Gorman, Eamon
In this paper we aim to constrain the wind temperature, outflow and turbulent velocities, ionization state, and mass-loss rate of the single red giant Arcturus (α Boo K1.5 III) using high spectral resolution Hubble Space Telescope Space Telescope Imaging Spectrograph profiles of Si III 1206.5 Å , O I 1304 Å and 1306 Å, C II 1334 Å and 1335 Å, and …