Search Publications
CEERS Key Paper. IX. Identifying Galaxy Mergers in CEERS NIRCam Images Using Random Forests and Convolutional Neural Networks
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +32 more
A crucial yet challenging task in galaxy evolution studies is the identification of distant merging galaxies, a task that suffers from a variety of issues ranging from telescope sensitivities and limitations to the inherently chaotic morphologies of young galaxies. In this paper, we use random forests and convolutional neural networks to identify …
Optical- and UV-continuum Morphologies of Compact Radio Source Hosts
Worrall, D. M.; Morganti, R.; O'Dea, C. P. +6 more
We present the first systematic search for UV signatures from radio source-driven active galactic nuclei (AGN) feedback in Compact Steep Spectrum (CSS) radio galaxies. Owing to their characteristic sub-galactic jets (1–20 kpc projected linear sizes), CSS hosts are excellent laboratories for probing galaxy scale feedback via jet-triggered star form…
The Impact of Cometary "Impacts" on the Chemistry, Climate, and Spectra of Hot Jupiter Atmospheres
Walsh, C.; Sainsbury-Martinez, F.
Impacts from icy and rocky bodies have helped shape the composition of Solar System objects; for example, the Earth–Moon system, or the recent impact of comet Shoemaker–Levy 9 with Jupiter. It is likely that such impacts also shape the composition of exoplanetary systems. Here, we investigate how cometary impacts might affect the atmospheric compo…
AGN STORM 2. X. The Origin of the Interband Continuum Delays in Mrk 817
Kaspi, Shai; Barth, Aaron J.; Horne, Keith +26 more
The local (z = 0.0315) active galactic nucleus (AGN) Mrk 817 was monitored over more than 500 days with space-borne and ground-based instruments as part of a large international campaign, AGN STORM 2. Here, we present a comprehensive analysis of the broadband continuum variations using detailed modeling of the broad line region (BLR), several type…
DIISC-III. Signatures of Stellar Disk Growth in Nearby Galaxies
Heckman, Timothy; Kennicutt, Robert C.; Thilker, David +8 more
We explore the growth of the stellar disks in 14 nearby spiral galaxies as part of the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey. We study the radial distribution of specific star formation rates (sSFRs) and investigate the ratio of the difference in the outer and inner sSFRs (Δ<…
Contemporaneous X-Ray Observations of 30 Bright Radio Bursts from the Prolific Fast Radio Burst Source FRB 20220912A
Kaspi, Victoria M.; Bhardwaj, Mohit; Scholz, Paul +21 more
We present an extensive contemporaneous X-ray and radio campaign performed on the repeating fast radio burst (FRB) source FRB 20220912A for 8 weeks immediately following the source's detection by CHIME/FRB. This includes X-ray data from XMM-Newton, NICER, and Swift, and radio detections of FRB 20220912A from CHIME/Pulsar and Effelsberg. We detect …
A Comprehensive Study of Open Cluster Chemical Homogeneity Using APOGEE and Milky Way Mapper Abundances
Cunha, Katia; Souto, Diogo; Tayar, Jamie +4 more
Stars in an open cluster are assumed to have formed from a broadly homogeneous distribution of gas, implying that they should be chemically homogeneous. Quantifying the level to which open clusters are chemically homogeneous can therefore tell us about interstellar medium pollution and gas mixing in progenitor molecular clouds. Using Sloan Digital…
Spatial Variations of Dust Opacity and Grain Growth in Dark Clouds: L1689, L1709, and L1712
Chen, Xi; Jiang, Biwei; Zhao, He +2 more
The far-infrared (FIR) opacity of dust in dark clouds within the Ophiuchus molecular cloud is investigated through multiwavelength infrared observations from UKIDSS, Spitzer, and Herschel. Employing the infrared color excess technique with both near-infrared and mid-infrared photometric data, a high-resolution extinction map in the K band (A …
ALMA-LEGUS. II. The Influence of Subgalactic Environments on Molecular Cloud Properties
Grebel, Eva K.; Smith, Linda J.; Aloisi, Alessandra +24 more
We compare the molecular cloud properties in subgalactic regions of two galaxies, barred spiral NGC 1313, which is forming many massive clusters, and flocculent spiral NGC 7793, which is forming significantly fewer massive clusters despite having a similar star formation rate to NGC 1313. We find that there are larger variations in cloud propertie…
Braving the Storm: Quantifying Disk-wide Ionized Outflows in the Large Magellanic Cloud with ULLYSES
Choi, Yumi; Olsen, Knut; Roman-Duval, Julia +11 more
The Large Magellanic Cloud (LMC) is home to many H II regions, which may lead to significant outflows. We examine the LMC's multiphase gas (T∼104-5 K) in H I, S II, Si IV, and C IV using 110 stellar sight lines from the Hubble Space Telescope's Ultraviolet Legacy Library of Young Stars as Essential Standards program. We develop a contin…