Search Publications
What Are the Radial Distributions of Density, Outflow Rates, and Cloud Structures in the M82 Wind?
Henry, Alaina; Heckman, Timothy; Xu, Xinfeng +2 more
Galactic winds play essential roles in the evolution of galaxies through the feedback they provide. Despite intensive studies of winds, the radial distributions of their properties and feedback are rarely observable. Here we present such measurements for the prototypical starburst galaxy, M82, based on observations by the Subaru Telescope. We dete…
An Ultradeep Multiband Very Large Array Survey of the Faint Radio Sky (COSMOS-XS): New Constraints on the Optically Dark Population
Smolčić, V.; Walter, F.; Riechers, D. A. +6 more
Attempts to trace star formation with rest-frame UV/optical observations at redshifts z > 2 are affected by the presence of potentially substantial, yet uncertain, dust attenuation. Recent studies have demonstrated the existence of a population of galaxies that are virtually invisible in the observed optical/near-infrared (NIR) due to dust obsc…
Evidence for Misalignment between Debris Disks and Their Host Stars
MacGregor, Meredith A.; Hurt, Spencer A.
We place lower limits on the obliquities between debris disks and their host stars for 31 systems by comparing their disk and stellar inclinations. While previous studies did not find evidence for misalignment, we identify six systems with minimum obliquities falling between ~30°and 60°, indicating that debris disks can be significantly misaligned…
The Accretion History of EX Lup: A Century of Bursts, Outbursts, and Quiescence
Fang, Min; Herczeg, Gregory J.; Johnstone, Doug +11 more
EX Lup is the archetype for the class of young stars that undergoes repeated accretion outbursts of ~5 mag at optical wavelengths that last for months. Despite extensive monitoring that dates back 130 yr, the accretion history of EX Lup remains mostly qualitative and has large uncertainties. We assess historical accretion rates of EX Lup by applyi…
Standardized Luminosity of the Tip of the Red Giant Branch Utilizing Multiple Fields in NGC 4258 and the CATs Algorithm
Casertano, Stefano; Li, Siyang; Riess, Adam G. +6 more
The tip of the red giant branch provides a luminous standard candle for calibrating distance ladders that reach Type Ia supernova (SN Ia) hosts. However, recent work reveals that tip measurements vary at the ~0.1 mag level for different stellar populations and locations within a host, which may lead to inconsistencies along the distance ladder. We…
Hubble Space Telescope and Hyper-Suprime-Cam Weak-lensing Study of the Equal-mass Dissociative Merger CIZA J0107.7+5408
Clarke, Tracy E.; Giacintucci, Simona; Jee, M. James +6 more
A dissociative merger is formed by the interplay of ram pressure and gravitational forces, which can lead to a spatial displacement of the dark matter and baryonic components of the recently collided subclusters. CIZA J0107.7+5408 is a nearby (z = 0.105) dissociative merger that hosts two X-ray brightness peaks and a bimodal galaxy distribution. A…
Estimates of Proton and Electron Heating Rates Extended to the Near-Sun Environment
McComas, D. J.; Bale, S. D.; Cranmer, S. R. +11 more
A central problem of space plasma physics is how protons and electrons are heated in a turbulent, magnetized plasma. The differential heating of charged species due to dissipation of turbulent fluctuations plays a key role in solar wind evolution. Measurements from previous heliophysics missions have provided estimates of proton and electron heati…
Demographics of Protoplanetary Disks: A Simulated Population of Edge-on Systems
Perrin, Marshall D.; Ménard, François; Angelo, Isabel +9 more
The structure of protoplanetary disks plays an essential role in planet formation. A disk that is highly inclined, or "edge-on," is of particular interest since its geometry provides a unique opportunity to study the disk's vertical structure and radial extent. Candidate edge-on protoplanetary disks are typically identified via their unique spectr…
SN 2023emq: A Flash-ionized Ibn Supernova with Possible C III Emission
Gromadzki, M.; Galbany, L.; Inserra, C. +16 more
SN 2023emq is a fast-evolving transient initially classified as a rare Type Icn supernova (SN), interacting with a H- and He-free circumstellar medium (CSM) around maximum light. Subsequent spectroscopy revealed the unambiguous emergence of narrow He lines, confidently placing SN 2023emq in the more common Type Ibn class. Photometrically, SN 2023e…
Measuring the 8621 A Diffuse Interstellar Band in Gaia DR3 RVS Spectra: Obtaining a Clean Catalog by Marginalizing over Stellar Types
Peek, J. E. G.; Zucker, Catherine; Finkbeiner, Douglas P. +2 more
Diffuse interstellar bands (DIBs) are broad absorption features associated with interstellar dust and can serve as chemical and kinematic tracers. Conventional measurements of DIBs in stellar spectra are complicated by residuals between observations and best-fit stellar models. To overcome this, we simultaneously model the spectrum as a combinatio…