Search Publications
Geminga's pulsar halo: An X-ray view
Woo, Jooyun; Hailey, Charles J.; Mori, Kaya +6 more
Geminga is the first pulsar around which a remarkable gamma-ray halo extending over a few degrees was discovered at TeV energies by MILAGRO and HAWC and later by H.E.S.S., and by Fermi-LAT in the GeV band. More middle-aged pulsars have exhibited gamma-ray halos, and they are now recognised as an emerging class of Galactic gamma-ray sources. The em…
Evidence of Ice-Rich Layered Deposits in the Medusae Fossae Formation of Mars
Orosei, Roberto; Plaut, Jeffrey J.; Campbell, Bruce A. +4 more
Subsurface reflectors in radar sounder data from the Mars Advanced Radar for Subsurface and Ionospheric Sounding instrument aboard the Mars Express spacecraft indicate significant dielectric contrasts between layers in the Martian Medusae Fossae Formation (MFF). Large density changes that create dielectric contrasts are less likely in deposits of …
JWST Mid-infrared Spectroscopy Resolves Gas, Dust, and Ice in Young Stellar Objects in the Large Magellanic Cloud
Hirschauer, Alec S.; Lenkić, Laura; Meixner, Margaret +9 more
In this work, we present spectra of 11 young stellar objects (YSOs) taken with the Mid-Infrared Instrument / Medium Resolution Spectroscopy (MRS) instrument on board the James Webb Space Telescope (JWST). The YSOs are located in the N79 region of the Large Magellanic Cloud (LMC), an active star-forming region with hundreds of Spitzer- and Herschel…
Merging Signatures in an Offset Lyman Continuum Emitter at Redshift 3.8
Zheng, Zhen-Ya; Cheng, Cheng; Yuan, Fang-Ting +3 more
Lyman continuum (LyC) emitters at z > 3 provide critical samples for studying the contribution of galaxies to the ionizing background in the epoch of reionization. We collect a sample of z > 3 LyC emitters, a dominant fraction (∼60%–70%) of which show spatial offsets between LyC emission and the nonionizing continuum. From this sample, espec…
Studying [C II] emission in low-mass galaxies at z 7
Strait, Victoria; Fujimoto, Seiji; Vallini, Livia +8 more
We report on a $\rm {[CII]}_{158\mu \rm {m}}$ search using the Atacama Large Millimeter/submillimeter Array (ALMA) on three lensed, confirmed Ly α emitting galaxies at z ~ 7. Our targets are ultraviolet (UV) faint systems with stellar masses on the order of M* ~ 109 M⊙. We detect a single [C II] line emission (4σ) …
Comparative Analysis of Type III Radio Bursts and Solar Flares: Spatial Localization and Correlation with Solar Flare Intensity
Maksimovic, Milan; Szabo, Adam; Bale, Stuart D. +8 more
We present a comprehensive study of type III radio bursts and their association with solar flares of magnitude M1.0 and larger, as observed by four widely separated spacecraft (Parker Solar Probe, Solar Orbiter, STEREO-A, and Wind). Our main focus is the introduction and validation of two methods for localizing radio bursts using the available mul…
JWST/NIRCam Paβ Narrowband Imaging Reveals Ordinary Dust Extinction for Hα Emitters within the Spiderweb Protocluster at z = 2.16
Pérez-González, Pablo G.; Koyama, Yusei; Kodama, Tadayuki +7 more
We combine JWST/NIRCam and Subaru/MOIRCS dual Paβ+Hα narrowband imaging to trace the dust attenuation and the star formation activities of a sample of 43 Hα emitters at the core of one of the most massive and best-studied clusters in formation at the cosmic noon: the Spiderweb protocluster at z = 2.16. We find that most Hα emitters display Paβ/Hα …
Spectroscopic Confirmation of Obscured AGN Populations from Unsupervised Machine Learning
Greene, Jenny E.; Goulding, Andy D.; Hainline, Kevin N. +1 more
We present the result of a spectroscopic campaign targeting active galactic nucleus (AGN) candidates selected using a novel unsupervised machine-learning (ML) algorithm trained on optical and mid-infrared photometry. AGN candidates are chosen without incorporating prior AGN selection criteria and are fainter, redder, and more numerous, ∼340 AGN de…
Methods for the Detection of Stellar Rotation Periods in Individual TESS Sectors and Results from the Prime Mission
Angus, Ruth; Curtis, Jason; David, Trevor +3 more
For ongoing studies of the role of rotation in stellar evolution, we require large catalogs of rotation periods for testing and refining gyrochronology. While there is a wealth of data from the Kepler and K2 missions, the Transiting Exoplanet Survey Satellite (TESS) presents both an opportunity and a challenge: despite its all-sky coverage, rotati…
The asymmetric bipolar [Fe II] jet and H2 outflow of TMC1A resolved with the JWST NIRSpec Integral Field Unit
Pontoppidan, K. M.; Bjerkeli, P.; Kristensen, L. E. +10 more
Context. Protostellar outflows exhibit large variations in their structure depending on the observed gas emission. To understand the origin of the observed variations, it is important to analyze the differences in the observed morphology and kinematics of the different tracers. The James Webb Space Telescope (JWST) allows us to study the physical …