Search Publications
Analysis of BMR Tilt from AutoTAB Catalog: Hinting toward the Thin Flux Tube Model?
Banerjee, Dipankar; Sreedevi, Anu; Jha, Bibhuti Kumar +1 more
One of the intriguing mechanisms of the Sun is the formation of bipolar magnetic regions (BMRs) in the solar convection zone (CZ), which are observed as regions of concentrated magnetic fields of opposite polarity on the photosphere. These BMRs are tilted with respect to the equatorial line, which statistically increases with latitude. The thin fl…
Identifying H I Emission and UV Absorber Associations near the Magellanic Stream
Putman, Mary E.; Zheng, Yong; Kim, Doyeon A.
We present a new technique to identify associations of H I emission in the Magellanic Stream (MS) and ultraviolet (UV) absorbers from 92 QSO sight lines near the MS. We quantify the level of associations of individual H I elements to the main H I body of the Stream using Wasserstein distance-based models, and derive characteristic spatial and kine…
Detection of a 2.85 µm Feature on Five Spinel-rich Asteroids from JWST
Ehlmann, Bethany L.; de Kleer, Katherine; Gomez Barrientos, Jonathan +2 more
Ground-based observations of "Barbarian" L-type asteroids at 1–2.5 µm indicate that their near-infrared spectra are dominated by the mineral spinel, which has been attributed to a high abundance of calcium-aluminum inclusions (CAIs)—the first solids to condense out of the protoplanetary disk during the formation of the solar system. However,…
The Optical to Infrared 0.6–5.3 µm Dust Extinction Law of the Milky Way with JWST NIRSpec: Westerlund 2
Wang, Shu; Chen, Xiaodian
The interstellar extinction law is important for interpreting observations and inferring the properties of interstellar dust grains. Based on the 993 prism/CLEAR spectra from the James Webb Space Telescope (JWST), we investigate the 0.6–5.3 µm interstellar dust extinction law. We propose a pair method to obtain the reddening curves based onl…
The Interplay between the Disk and Corona of the Changing-look Active Galactic Nucleus 1ES 1927+654
Ho, Luis C.; Ricci, Claudio; Trakhtenbrot, Benny +4 more
Time-domain studies of active galactic nuclei (AGNs) offer a powerful tool for understanding black hole accretion physics. Prior to the optical outburst on 2017 December 23, 1ES 1927+654 was classified as a "true" type 2 AGN, an unobscured source intrinsically devoid of broad-line emission in polarized spectra. Through our 3 yr monitoring campaign…
Radio-only and Radio-to-far-ultraviolet Spectral Energy Distribution Modeling of 14 ULIRGs: Insights into the Global Properties of Infrared Bright Galaxies
Díaz-Santos, Tanio; Małek, Katarzyna; Dey, Subhrata +1 more
We present detailed spectral energy distribution (SED) modeling of 14 local ultraluminous infrared galaxies (ULIRGs) with outstanding photometric data from the literature covering the ultraviolet–infrared (FIR) and radio bands (∼50 MHz to ∼30 GHz). We employ the CIGALE SED fitting code to model the ultraviolet–FIR–radio SED. For the radio-only SED…
Survey of Magnetic Field Parameters Associated with Large Solar Flares
Hou, Yijun; Li, Ting; Chen, Anqin +4 more
Until now, how the magnetic fields in M/X-class flaring active regions (ARs) differ from C-class flaring ARs remains unclear. Here, we calculate the key magnetic field parameters within the area of high photospheric free energy density (HED region) for 323 ARs (217 C- and 106 M/X-flaring ARs), including total photospheric free magnetic energy dens…
JWST Ice Band Profiles Reveal Mixed Ice Compositions in the HH 48 NE Disk
McGuire, Brett A.; van Dishoeck, E. F.; Bergner, Jennifer B. +19 more
Planet formation is strongly influenced by the composition and distribution of volatiles within protoplanetary disks. With JWST, it is now possible to obtain direct observational constraints on disk ices, as recently demonstrated by the detection of ice absorption features toward the edge-on HH 48 NE disk as part of the Ice Age Early Release Scien…
Magnetic Field of Molecular Gas Measured with the Velocity Gradient Technique. II. Curved Magnetic Field in kpc-scale Bubble of NGC 628
Li, Dalei; Tang, Xindi; Zhou, Jianjun +9 more
We report the detection of the ordered alignment between the magnetic field and kpc-scale bubbles in the nearby spiral galaxy, NGC 628. Applying the Velocity Gradient Technique on CO spectroscopic data from the ALMA-PHANGS, the magnetic field of NGC 628 is measured at the scale of 191 pc (∼4″). The large-scale magnetic field is oriented parallel t…
Near Subsonic Solar Wind Outflow from an Active Region
Riley, Pete; Bale, Stuart D.; Sioulas, Nikos +10 more
During Parker Solar Probe (Parker) Encounter 15 (E15), we observe an 18 hr period of near-subsonic (M S ∼ 1) and sub-Alfvénic (SA), M A ⋘ 1, slow-speed solar wind from 22 to 15.6 R ⊙. As the most extreme SA interval measured to date and skirting the solar wind sonic point, it is the deepest Parker has probed into t…