Search Publications
Mixing of Hot Shocked Plasma with Cold Gas in Nova YZ Ret 2020
Drake, Jeremy J.; Ness, Jan-Uwe; Behar, Ehud +5 more
The origin of bright X-ray emission lines that appear late in a nova eruption remains largely a puzzle. We present two high-resolution X-ray grating spectra of the classical nova YZ Ret, observed 77 and 115 days post-eruption, using XMM-Newton and Chandra, respectively. Both spectra feature resolved emission lines blueshifted by v = –1500 km s
A Lens Finder Map to Check Claimed High-z Galaxies behind SMACS J0723.3-7327
Broadhurst, Tom; Windhorst, Rogier; Summers, Jake +5 more
The first science image released by the James Webb Space Telescope (JWST) reveals numerous galaxies in the distant background of the galaxy cluster SMACS J0723.3-7327. Some have claimed redshifts of up to z ≃ 20, challenging standard cosmological models for structure formation. Here, we present a lens model for SMACS J0723.3-7327 anchored on five …
A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles
Muzzin, Adam; Sarrouh, Ghassan T. E.; Marchesini, Danilo +3 more
The resolved mass assembly of Milky Way–mass galaxies has been previously studied in simulations, the local Universe, and at higher redshifts using infrared (IR) light profiles. To better characterize the mass assembly of Milky Way analogs (MWAs), as well as their changes in star formation rate (SFR) and color gradients, we construct resolved stel…
The Application of Manifold Learning to a Selection of Different Galaxy Populations and Scaling Relation Analysis
Reddy, Naveen A.; Azadi, Mojegan; Shivaei, Irene +8 more
The growing volume of data produced by large astronomical surveys necessitates the development of efficient analysis techniques capable of effectively managing high-dimensional data sets. This study addresses this need by demonstrating some applications of manifold learning and dimensionality reduction techniques, specifically the self-organizing …
The BANANA Project. VII. High Eccentricity Predicts Spin–Orbit Misalignment in Binaries
Winn, Joshua N.; Albrecht, Simon H.; Lundkvist, Mia S. +3 more
The degree of spin–orbit alignment in a population of binary stars can be determined from measurements of their orbital inclinations and rotational broadening of their spectral lines. Alignment in a face-on binary guarantees low rotational broadening, while alignment in an edge-on binary maximizes the rotational broadening. In contrast, if spin–or…
Dust around Massive Stars Is Agnostic to Galactic Environment: New Insights from PHAT/BEAST
Murray, Claire E.; Gordon, Karl D.; Peek, J. E. G. +2 more
Resolving the environments of massive stars is crucial for understanding their formation mechanisms and their impact on galaxy evolution. An important open question is whether massive stars found in diffuse regions outside spiral arms formed in situ or migrated there after forming in denser environments. To address this question, we use multiresol…
Gamma-Ray Burst Observations by the High-Energy Particle Detector on board the China Seismo-Electromagnetic Satellite between 2019 and 2021
Vitale, V.; Ubertini, P.; Bazzano, A. +68 more
In this paper we report the detection of five strong gamma-ray bursts (GRBs) by the High-Energy Particle Detector (HEPD-01) mounted on board the China Seismo-Electromagnetic Satellite, operational since 2018 on a Sun-synchronous polar orbit at a ~507 km altitude and 97° inclination. HEPD-01 was designed to detect high-energy electrons in the energ…
oMEGACat. IV. Constraining the Ages of Omega Centauri Subgiant Branch Stars with HST and MUSE
Wang, Z.; Latour, M.; Kacharov, N. +13 more
We present age estimates for over 8100 subgiant branch (SGB) stars in Omega Centauri (ω Cen) to study its star formation history. Our large data set, which combines multi-wavelength Hubble Space Telescope photometry with MUSE metallicities, provides an unprecedented opportunity to measure individual stellar ages. We do this by fitting each star's …
First Constraints on the Interstellar Medium Conditions of a Low-mass, Highly Obscured z = 4.27 Main-sequence Galaxy
Murphy, Eric; McKinney, Jed; Whitaker, Katherine E. +4 more
We present the molecular gas content and interstellar medium conditions of MACS J0717_Az9, a strong gravitationally lensed z = 4.273, M * ≃ 2 × 109 M ⊙ star-forming galaxy with an unusually high (∼80%) obscured star formation fraction. We detect CO (4–3) in two independent lensed images, as well as [N II] 205 &micr…
A Broad Set of Solar and Cosmochemical Data Indicates High C-N-O Abundances for the Solar System
Lunine, Jonathan I.; Glein, Christopher R.; Truong, Ngoc
We examine the role of refractory organics as a major C carrier in the outer protosolar nebula and its implications for the compositions of large Kuiper Belt objects (KBOs) and CI chondrites. By utilizing Rosetta measurements of refractory organics in comet 67P/Churyumov–Gerasimenko, we show that they would make up a large fraction of the protosol…