Search Publications
What Is Missing from the Local Stellar Halo?
Conroy, Charlie; Naidu, Rohan P.; Sharpe, Katherine
The Milky Way's stellar halo, which extends to >100 kpc, encodes the evolutionary history of our Galaxy. However, most studies of the halo to date have been limited to within a few kiloparsecs of the Sun. Here, we characterize differences between this local halo and the stellar halo in its entirety. We construct a composite stellar halo model b…
A Snapshot Survey of Nearby Supernovae with the Hubble Space Telescope
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +12 more
Over recent decades, robotic (or highly automated) searches for supernovae (SNe) have discovered several thousand events, many of them in quite nearby galaxies (distances < 30 Mpc). Most of these SNe, including some of the best-studied events to date, were found before maximum brightness and have associated with them extensive follow-up photome…
New Galaxy UV Luminosity Constraints on Warm Dark Matter from JWST
Liu, Bin; Shan, Huanyuan; Zhang, Jiajun
We exploit the recent James Webb Space Telescope (JWST) determination of galaxy UV luminosity functions over the redshift range z = 9–14.5 to derive constraints on warm dark matter (WDM) models. The delayed structure formations in WDM universes make high-redshift observations a powerful probe to set limits on the particle mass m x of WD…
A Unified Model for Bipolar Outflows from Young Stars: Kinematic and Mixing Structures in HH 30
Johnstone, Doug; Liu, Chun-Fan; Shang, Hsien +2 more
The young stellar source HH 30 is a textbook example of an ionic optical jet originating from a disk in an edge-on system shown by the Hubble Space Telescope. It has a remnant envelope in 12CO observed by the Atacama Large Millimeter/submillimeter Array. The optical jet is characterized by its narrow appearance, large line width at the …
Kinematic Age of the β-Pictoris Moving Group
Song, Inseok; Lee, Jinhee
Accurate age estimation of nearby young moving groups (NYMGs) is important as they serve as crucial testbeds in various fields of astrophysics, including the formation and evolution of stars and planets, as well as loose stellar associations. The β-Pictoris moving group (BPMG), being one of the closest and youngest NYMGs, has been extensively inve…
GRB 231115A: A Nearby Magnetar Giant Flare or a Cosmic Short Gamma-Ray Burst?
Zhou, Hao; Jin, Zhi-Ping; Wang, Yun +3 more
There are two classes of gamma-ray transients with a duration shorter than 2 s. One consists of cosmic short gamma-ray bursts (GRBs) taking place in the deep Universe via the neutron star mergers, and the other is the magnetar giant flares (GFs) with energies of ∼1044 ‑ 1046 erg from "nearby" galaxies. Though the magnetar GFs…
The Power of High-precision Broadband Photometry: Tracing the Milky Way Density Profile with Blue Horizontal Branch Stars in the Dark Energy Survey
Lewis, Geraint F.; Erkal, Denis; Bland-Hawthorn, Joss +9 more
Blue horizontal branch stars (BHBs), excellent distant tracers for probing the Milky Way's halo density profile, are distinguished in the
Turbulence, and Proton and Electron Heating Rates in the Solar Corona: Analytical Approach
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +5 more
Analytical solutions for 2D and slab turbulence energies in the solar corona are presented, including a derivation of the corresponding correlation lengths, with implications for the proton and electron temperatures in the solar corona. These solutions are derived by solving the transport equations for 2D and slab turbulence energies and their cor…
A Case Study of Gas Impacted by Black-hole Jets with the JWST: Outflows, Bow Shocks, and High Excitation of the Gas in the Galaxy IC 5063
Malkan, Matthew; Armus, Lee; Spinoglio, Luigi +8 more
We present James Webb Space Telescope MIRI data of the inner ∼3 × 2 kpc2 of the galaxy IC 5063, in which the jets of a supermassive black hole interact with the gaseous disk they are crossing. Jet-driven outflows were known to be initiated along or near the jet path and to modify the stability of molecular clouds, possibly altering thei…
Investigating Model Dependencies for Obscured Active Galactic Nuclei: A Case Study of NGC 3982
Ricci, Claudio; Boorman, Peter G.; Kallová, Kristína
X-ray spectroscopy of heavily obscured active galactic nuclei (AGN) offers a unique opportunity to study the circumnuclear environment of accreting supermassive black holes. However, individual models describing the obscurer have unique parameter spaces that give distinct parameter posterior distributions when fit to the same data. To assess the i…