Search Publications
Passing Stars as an Important Driver of Paleoclimate and the Solar System's Orbital Evolution
Raymond, Sean N.; Kaib, Nathan A.
Reconstructions of the paleoclimate indicate that ancient climatic fluctuations on Earth are often correlated with variations in its orbital elements. However, the chaos inherent in the solar system's orbital evolution prevents numerical simulations from confidently predicting Earth's past orbital evolution beyond 50–100 Myr. Gravitational interac…
Deciphering Radio Emissions from Accretion Disk Winds in Radio-quiet Active Galactic Nuclei
Inoue, Yoshiyuki; Yamada, Tomoya; Sakai, Nobuyuki +1 more
Unraveling the origins of radio emissions from radio-quiet active galactic nuclei (RQ AGNs) remains a pivotal challenge in astrophysics. One potential source of this radiation is the shock interaction between AGN disk winds and the interstellar medium (ISM). To understand this phenomenon, we construct a spherical, one-zone, and self-similar expans…
Diagnosing the Particle Transport Mechanism in the Pulsar Halo via X-Ray Observations
Liu, Ruo-Yu; Ge, Chong; Wu, Qi-Zuo +2 more
Pulsar halos (also termed "TeV halos") are a new class of γ-ray sources in the Galaxy, which manifest as extended γ-ray emission around middle-aged pulsars, as discovered around the Geminga pulsar, the Monogem pulsar, and PSR J0622+3749 by the High-Altitude Water Cherenkov Observatory and the Large High-Altitude Air Shower Observatory. A consensus…
Deciphering the Kinematic Substructure of Local Dark Matter with LAMOST K Giants
Mao, Shude; Liu, Chao; Xue, Xiang-Xiang +5 more
Numerical simulations indicate that correlations exist between the velocity distributions of stars and dark matter (DM). We study the local DM velocity distribution based on these correlations. We select K giants from LAMOST DR8 cross-matched with Gaia DR3, which have robust measurements of velocity and metallicity, and separate them into the disk…
The COS-Holes Survey: Connecting Galaxy Black Hole Mass with the State of the CGM
Prochaska, J. Xavier; Crain, Robert A.; Burchett, Joseph N. +9 more
We present an analysis of Hubble Space Telescope COS/G160M observations of C IV in the inner circumgalactic medium (CGM) of a novel sample of eight z ∼ 0, L ≈ L ⋆ galaxies, paired with UV-bright QSOs at impact parameters (R proj) between 25 and 130 kpc. The galaxies in this stellar-mass-controlled sample (log10 M <…
Large-scale Mapping Observations of DCN and DCO+ toward Orion KL
Tamura, Yoichi; Kohno, Kotaro; Kawabe, Ryohei +16 more
We present emission maps ( $1\buildrel{\,\prime}\over{.} 5\,\times \,1\buildrel{\,\prime}\over{.} 5$ scale, corresponding to 0.18 pc) of the DCN (J = 2 ‑ 1) and DCO+ (J = 2 ‑ 1) lines in the 2 mm band toward the Orion KL region obtained with the 2 mm receiver system named B4R installed on the Large Millimeter Telescope. The DCN emission…
On the Determination of Stellar Mass and Binary Fraction of Open Clusters within 500 pc from the Sun
Chen, Li; Zhong, Jing; Hou, Jinliang +3 more
We investigated the stellar mass function and the binary fraction of 114 nearby open clusters (OCs) using the high-precision photometric data from Gaia Data Release 3 (Gaia DR3). We estimated the mass of member stars by using a ridge line that is better in line with the observed color–magnitude diagram, thus obtaining more accurate stellar mass an…
Simulated Coronal Mass Ejections on a Young Solar-type Star and the Associated Instantaneous Angular Momentum Loss
Tian, Hui; Alvarado-Gómez, Julián D.; Poppenhäger, Katja +3 more
Coronal mass ejections (CMEs) on stars can change the stars' magnetic field configurations and mass-loss rates during the eruption and propagation and therefore, may affect the stars' rotation properties on long timescales. The dynamics of stellar CMEs and their influence on the stellar angular momentum loss rate are not yet well understood. In or…
Unveiling the Small-scale Jets in the Rapidly Growing Supermassive Black Hole IZw1
Ho, Luis C.; Gallo, Luigi C.; Yao, Su +10 more
Accretion of black holes at near-Eddington or super-Eddington rates represents the most powerful episode driving black hole growth, potentially occurring across various types of objects. However, the physics governing accretion and jet–disk coupling in such states remains unclear, primarily due to the difficulty in detecting associated jets, which…
Structure and Color Gradients of Ultradiffuse Galaxies in Distant Massive Galaxy Clusters
Cui, Qifan; Yesuf, Hassen M.; Wu, Hong +2 more
We have measured structural parameters and radial color profiles of 108 ultradiffuse galaxies (UDGs), carefully selected from six distant massive galaxy clusters in the Hubble Frontier Fields (HFF) in a redshift range from 0.308 to 0.545. Our best-fitting GALFIT models show that the HFF UDGs have a median Sérsic index of 1.09, which is close to 0.…