Search Publications
An Analysis of Active Galactic Nucleus–driven Outflows in the Seyfert 1 Galaxy NGC 3227
Fischer, Travis C.; Riffel, Rogemar A.; Crenshaw, D. Michael +8 more
We have characterized the ionized, neutral, and warm molecular gas kinematics in the Seyfert 1 galaxy NGC 3227 using observations from the Hubble Space Telescope Space Telescope Imaging Spectrograph, Apache Point Observatory's Kitt Peak Ohio State Multi-Object Spectrograph, Gemini-North's Near-Infrared Integral Field Spectrometer, and the Atacama …
Connecting Lyα and Ionizing Photon Escape in the Sunburst Arc
Hutchison, Taylor A.; Mahler, Guillaume; Chisholm, John +17 more
We investigate the Lyα and Lyman continuum (LyC) properties of the Sunburst Arc, a z = 2.37 gravitationally lensed galaxy with a multiply imaged, compact region leaking LyC and a triple-peaked Lyα profile indicating direct Lyα escape. Non-LyC-leaking regions show a redshifted Lyα peak, a redshifted and central Lyα peak, or a triple-peaked Lyα prof…
Filter Design for Estimation of Stellar Metallicity: Insights from Experiments with Gaia XP Spectra
Xiang, Maosheng; Huang, Yang; Liu, Jifeng +11 more
We search for an optimal filter design for the estimation of stellar metallicity, based on synthetic photometry from Gaia XP spectra convolved with a series of filter-transmission curves defined by different central wavelengths and bandwidths. Unlike previous designs based solely on maximizing metallicity sensitivity, we find that the optimal solu…
Constraining Free–Free Emission and Photoevaporative Mass-loss Rates for Known Proplyds and New VLA–identified Candidate Proplyds in NGC 1977
Eisner, Josh A.; Boyden, Ryan D.
We present NSF's Karl G. Jansky Very Large Array observations covering the NGC 1977 region at 3.0, 6.4, and 15.0 GHz. We search for compact radio sources and detect continuum emission from 34 NGC 1977 cluster members and 37 background objects. Of the 34 radio-detected cluster members, 3 are associated with known proplyds in NGC 1977, 22 are associ…
Spin–Orbit Alignment of Early-type Astrometric Binaries and the Origin of Slow Rotators
Kratter, Kaitlin M.; Moe, Maxwell; Smith, Chase L.
The spin–orbit alignment of binary stars traces their formation and accretion history. Previous studies of spin–orbit alignment have been limited to small samples, slowly rotating solar-type stars, and/or wide visual binaries that not surprisingly manifest random spin–orbit orientations. We analyze 917 Gaia astrometric binaries across periods P = …
Investigating Mass Segregation of the Binary Stars in the Open Cluster NGC 6819
von Hippel, Ted; Motherway, Erin; Geller, Aaron M. +2 more
We search for mass segregation in the intermediate-aged open cluster NGC 6819 within a carefully identified sample of probable cluster members. Using photometry from Gaia, Pan-STARRS, and the Two Micron All Sky Survey as inputs for a Bayesian statistics software suite, BASE-9, we identify a rich population of (photometric) binaries and derive post…
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 …