Search Publications
PHANGS-JWST First Results: A Global and Moderately Resolved View of Mid-infrared and CO Line Emission from Galaxies at the Start of the JWST Era
Ellison, Sara L.; Wilson, Christine D.; Bolatto, Alberto D. +42 more
We explore the relationship between mid-infrared (mid-IR) and CO rotational line emission from massive star-forming galaxies, which is one of the tightest scalings in the local universe. We assemble a large set of unresolved and moderately (~1 kpc) spatially resolved measurements of CO (1-0) and CO (2-1) intensity, I CO, and mid-IR inte…
Timing the r-process Enrichment of the Ultra-faint Dwarf Galaxy Reticulum II
Brown, Thomas M.; Bacon, D.; Smith, M. +65 more
The ultra-faint dwarf galaxy Reticulum II (Ret II) exhibits a unique chemical evolution history, with ${72}_{-12}^{+10}$ % of its stars strongly enhanced in r-process elements. We present deep Hubble Space Telescope photometry of Ret II and analyze its star formation history. As in other ultra-faint dwarfs, the color-magnitude diagram is best fit …
Plasmoids, Flows, and Jets during Magnetic Reconnection in a Failed Solar Eruption
Antiochos, Spiro K.; Kumar, Pankaj; Cho, Kyung-Suk +3 more
We report a detailed analysis of a failed eruption and flare in active region 12018 on 2014 April 3 using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly, IRIS, STEREO, and Hinode/Solar Optical Telescope. At least four jets were observed to emanate from the cusp of this small active region (large brigh…
The Cosmic Ultraviolet Baryon Survey: Empirical Characterization of Turbulence in the Cool Circumgalactic Medium
Faucher-Giguère, Claude-André; Johnson, Sean D.; Zahedy, Fakhri S. +11 more
This paper reports the first measurement of the relationship between turbulent velocity and cloud size in the diffuse circumgalactic medium (CGM) in typical galaxy halos at redshift z ≈ 0.4-1. Through spectrally resolved absorption profiles of a suite of ionic transitions paired with careful ionization analyses of individual components, cool clump…
Measuring the Dust Masses of Protoplanetary Disks in Lupus with ALMA: Evidence That Disks Can Be Optically Thick at 3 mm
Ribas, Á.; Macías, E.; Espaillat, C. C. +2 more
Accurate disk mass measurements are necessary to constrain disk evolution and the timescale of planet formation, but such measurements are difficult to make and are very dependent on assumptions. Here, we look at the assumption that the disk is optically thin at radio wavelengths and the effect of this assumption on measurements of disk dust mass.…
First Evidence of Multi-iron Subpopulations in the Bulge Fossil Fragment Candidate Liller 1
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +9 more
In the context of a project aimed at characterizing the properties of the so-called Bulge Fossil Fragments (the fossil remnants of the bulge formation epoch), here we present the first determination of the metallicity distribution of Liller 1. For a sample of 64 individual member stars we used ESO-MUSE spectra to measure the equivalent width of th…
A NOEMA Molecular Line Scan of the Hubble Deep Field North: Improved Constraints on the CO Luminosity Functions and Cosmic Density of Molecular Gas
Carilli, Chris; Boogaard, Leindert A.; Pety, Jérôme +9 more
We present measurements of the CO luminosity functions (LFs) and the evolution of the cosmic molecular gas density out to z ~ 6 based on an 8.5 arcmin2 spectral scan survey at 3 mm of the iconic Hubble Deep Field North (HDF-N) observed with the NOrthern Extended Millimeter Array (NOEMA). We use matched filtering to search for line emiss…
Probing the Origin of Changing-look Quasar Transitions with Chandra
Green, Paul J.; Anderson, Scott F.; Bieryla, Allyson +9 more
Extremely variable quasars can also show strong changes in broad-line emission strength and are known as changing-look quasars (CLQs). To study the CLQ transition mechanism, we present a pilot sample of CLQs with X-ray observations in both the bright and faint states. From a sample of quasars with bright-state archival SDSS spectra and (Chandra or…
The JWST PEARLS View of the El Gordo Galaxy Cluster and of the Structure It Magnifies
Grogin, Norman A.; Koekemoer, Anton M.; Pirzkal, Nor +41 more
The massive galaxy cluster El Gordo (z = 0.87) imprints multitudes of gravitationally lensed arcs onto James Webb Space Telescope Near-Infrared Camera (NIRCam) images. Eight bands of NIRCam imaging were obtained in the "Prime Extragalactic Areas for Reionization and Lensing Science" ("PEARLS") program. Point-spread function-matched photometry acro…
TOI-3235 b: A Transiting Giant Planet around an M4 Dwarf Star
Vanderburg, Andrew; Latham, David W.; Jordán, Andrés +34 more
We present the discovery of TOI-3235 b, a short-period Jupiter orbiting an M dwarf with a stellar mass close to the critical mass at which stars transition from partially to fully convective. TOI-3235 b was first identified as a candidate from TESS photometry and confirmed with radial velocities from ESPRESSO and ground-based photometry from HATSo…