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…
Quasars as standard candles: VI. Spectroscopic validation of the cosmological sample
Marconi, Alessandro; Signorini, Matilde; Risaliti, Guido +6 more
A sample of quasars has been recently assembled to investigate the non-linear relation between their monochromatic luminosities at 2500 Å and 2 keV and to exploit quasars as a new class of 'standardized candles'. The use of this technique for cosmological purposes relies on the non-evolution with redshift of the UV-optical spectral properties of q…
CIRCLEZ : Reliable photometric redshifts for active galactic nuclei computed solely using photometry from Legacy Survey Imaging for DESI
Shirley, R.; Salvato, M.; Buchner, J. +25 more
Context. Photometric redshifts for galaxies hosting an accreting supermassive black hole in their center, known as active galactic nuclei (AGNs), are notoriously challenging. At present, they are most optimally computed via spectral energy distribution (SED) fittings, assuming that deep photometry for many wavelengths is available. However, for AG…
Repainting the colour-mass diagrams by unearthing the green mountain: dust-rich S0 galaxies in the colour-(galaxy stellar mass) diagram, and the colour-(black hole mass) relations for dust-poor versus dust-rich galaxies
Graham, Alister W.
Lenticular galaxies are notoriously misclassified as elliptical galaxies and, as such, a (disc inclination)-dependent correction for dust is often not applied to the magnitudes of dusty lenticular galaxies. This results in overly red galaxy colours, impacting their distribution in the colour-magnitude diagram. It is revealed how this has led to an…
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…