Search Publications
The Leakage of Lyman-continuum Photons from a Major Merger at z ∼ 1
Saha, Kanak; Herenz, Edmund Christian; Maulick, Soumil +1 more
We report the detection of Lyman-continuum (LyC) photons from a massive interacting system at z = 1.097 in the Hubble Ultra Deep Field. The LyC detection is made in the far-ultraviolet F154W band of the UVIT telescope on board AstroSat. Both JWST and Hubble Space Telescope (HST) imaging of the system reveal signs that it is a likely merger. In par…
An Eccentric Binary with a Misaligned Circumbinary Disk
Fang, Min; Huang, Yang; Dai, Fei +4 more
We present spectroscopic and photometric observations of Bernhard-2, which was previously identified as a candidate system that hosts a misaligned circumbinary disk. Our spectroscopic measurements confirm that Bernhard-2 indeed contains an eccentric (e = 0.69 ± 0.08) binary and thus that the periodic variability in the photometric light curve is b…
Chemo-dynamical Evolution of Simulated Satellites for a Milky Way–like Galaxy
Beers, Timothy C.; Anguiano, Borja; Ishigaki, Miho N. +5 more
The chemical abundances of Milky Way's (MW's) satellites reflect their star formation histories (SFHs), yet, due to the difficulty of determining the ages of old stars, the SFHs of most satellites are poorly measured. Ongoing and upcoming surveys will obtain around 10 times more medium-resolution spectra for stars in satellites than are currently …
Modeling X-Ray and Gamma-Ray Emission from Redback Pulsar Binaries
An, Hongjun; Wadiasingh, Zorawar; Sim, Minju
We investigated the multiband emission from the pulsar binaries XSS J12270‑4859, PSR J2039‑5617, and PSR J2339‑0533, which exhibit orbital modulation in the X-ray and gamma-ray bands. We constructed the sources' broadband spectral energy distributions and multiband orbital light curves by supplementing our X-ray measurements with published gamma-r…
Investigations of Massive Filaments and Star Formation (INFANT). I. Core Identification and Core Mass Function
Sanhueza, Patricio; Gu, Qilao; Liu, Tie +16 more
Filamentary structures are ubiquitously found in high-mass star-forming clouds. To investigate the relationship between filaments and star formation, we carry out the INFANT (Investigations of Massive Filaments and Sar Formation) survey, a multiscale, multiwavelength survey of massive filamentary clouds with Atacama Large Millimeter/submillimeter …
Mixed Source Region Signatures inside Magnetic Switchback Patches Inferred by Heavy Ion Diagnostics
Landi, Enrico; Bale, Stuart D.; Owen, Christopher J. +13 more
Since Parker Solar Probe's (Parker's) first perihelion pass at the Sun, large-amplitude Alfvén waves grouped in patches have been observed near the Sun throughout the mission. Several formation processes for these magnetic switchback patches have been suggested with no definitive consensus. To provide insight into their formation, we examine the h…
Aligning Planet-hosting Binaries via Dissipative Precession in Circumstellar Disks
Vanderburg, Andrew; Rice, Malena; Christian, Sam +2 more
Recent observations have demonstrated that some subsets of even moderately wide-separation planet-hosting binaries are preferentially configured such that planetary and binary orbits appear to lie within the same plane. In this work, we explore dissipation during the protoplanetary disk phase, induced by disk warping as the system is forced into n…
Dark No More: The Low-luminosity Stellar Counterpart of a Dark Cloud in the Virgo Cluster
Janowiecki, Steven; Sand, David J.; Jones, Michael G. +9 more
We have discovered the stellar counterpart to the ALFALFA Virgo 7 cloud complex, which has been thought to be optically dark and nearly star-free since its discovery in 2007. This ∼190 kpc long chain of enormous atomic gas clouds (M H I ∼ 109 M ⊙) is embedded in the hot intracluster medium of the Virgo galaxy clus…
An Optical Search for New Outbursting Low Mass X-Ray Binaries
Clarkson, William I.; Riddle, Reed; Rusholme, Ben +5 more
Transient low-mass X-ray binaries (LMXBs) are discovered largely by X-ray and gamma-ray all-sky monitors. The X-ray outburst is also accompanied by an optical brightening, which empirically can precede the detection of X-rays. Newly sensitive optical synoptic surveys may offer a complementary pathway for discovery and potential for insight into th…
GOALS-JWST: Constraining the Emergence Timescale for Massive Star Clusters in NGC 3256
Inami, Hanae; Böker, Torsten; Lenkić, Laura +28 more
We present the results of a James Webb Space Telescope NIRCam and NIRSpec investigation into the young massive star cluster (YMC) population of NGC 3256, the most cluster-rich luminous infrared galaxy in the Great Observatories All Sky LIRG Survey. We detect 3061 compact YMC candidates with a signal-to-noise ratio ≥3 at F150W, F200W, and F335M. Ba…