Search Publications
Tracing the Giant Outer Halo of the Mysterious Massive Disk Galaxy M104. I. Photometry of the Extended Globular Cluster Systems
Park, Byeong-Gon; Hwang, Narae; Lee, Myung Gyoon +4 more
M104 (NGC 4594, the Sombrero galaxy) is a mysterious massive early-type galaxy that shows a dominant bulge and a prominent disk. However, the presence of a halo in M104 has been elusive, and it is not yet known how M104 has acquired such a peculiar structure. Using wide (~2 deg2) and deep ugi images of M104 obtained with the CFHT/MegaCa…
A Volumetric Study of Flux Transfer Events at the Dayside Magnetopause
Strugarek, Antoine; Vaidya, Bhargav; Paul, Arghyadeep
Localized magnetic reconnection at the dayside magnetopause leads to the production of Flux Transfer Events (FTEs). The magnetic fields within the FTEs exhibit complex helical flux-rope topologies. Leveraging the adaptive mesh refinement strategy, we perform a three-dimensional magnetohydrodynamic simulation of the magnetosphere of an Earth-like p…
Substructure at High Speed. I. Inferring the Escape Velocity in the Presence of Kinematic Substructure
Necib, Lina; Lin, Tongyan
The local escape velocity provides valuable inputs to the mass profile of the galaxy, and requires understanding the tail of the stellar speed distribution. Following Leonard & Tremaine, various works have since modeled the tail of the stellar speed distribution as $\propto {({v}_{\mathrm{esc}}-v)}^{k}$ , where v esc is the escape v…
Deep Upper Limit on the Optical Emission during a Hard X-Ray Burst from the Magnetar SGR J1935+2154
Naletto, Giampiero; Burtovoi, Aleksandr; Mereghetti, Sandro +9 more
In 2021 September the magnetar SGR J1935+2154 entered a stage of burst/flaring activity in the hard X-ray band. On 2021 September 10, we observed SGR J1935+2154 with the fiber-fed fast optical photon counter IFI+Iqueye, mounted at the 1.22 m Galileo telescope in Asiago. During one of the IFI+Iqueye observing windows, a hard X-ray burst was detecte…
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…