Search Publications
AGN STORM 2. V. Anomalous Behavior of the C IV Light Curve of Mrk 817
Treu, Tommaso; Kaspi, Shai; Hall, Patrick B. +49 more
An intensive reverberation mapping campaign of the Seyfert 1 galaxy Mrk 817 using the Cosmic Origins Spectrograph on the Hubble Space Telescope revealed significant variations in the response of broad UV emission lines to fluctuations in the continuum emission. The response of the prominent UV emission lines changes over an ∼60 day duration, resul…
The Lyα Nondetection by JWST NIRSpec of a Strong Lyα Emitter at z = 5.66 Confirmed by MUSE
Kong, Xu; Cheng, Cheng; Boyett, Kristan +6 more
The detections of Lyα emission in galaxies with redshifts above 5 are of utmost importance for constraining the cosmic reionization timeline, yet such detections are usually based on slit spectroscopy. Here we investigate the significant bias induced by slit placement on the estimate of Lyα escape fraction (
The Environments of Fast Radio Bursts Viewed Using Adaptive Optics
Kilpatrick, Charles D.; Simha, Sunil; Prochaska, J. Xavier +10 more
We present observations from the Gemini Multi-Conjugate Adaptive Optics System/Gemini South Adaptive Optics Imager at Gemini South of five fast radio burst (FRB) host galaxies of FRBs with subarcsecond localizations. We examine and quantify the spatial distributions and locations of the FRBs with respect to their host galaxy light distributions, f…
The CO-to-H2 Conversion Factor in the Barred Spiral Galaxy M83
Lee, Amanda M.; Koda, Jin; Hirota, Akihiko +2 more
We analyze the CO-to-H2 conversion factor (α CO) in the nearby barred spiral galaxy M83. We present new H I observations from the VLA and single-dish GBT in the disk of the galaxy, and combine them with maps of CO(1-0) integrated intensity and dust surface density from the literature. α CO and the gas-to-dust ratio…
A Potential Second Shutoff from AT2018fyk: An Updated Orbital Ephemeris of the Surviving Star under the Repeating Partial Tidal Disruption Event Paradigm
Wevers, T.; Coughlin, E. R.; Hinkle, Jason T. +4 more
The tidal disruption event (TDE) AT2018fyk showed a rapid dimming event 500 days after discovery, followed by a rebrightening roughly 700 days later. It has been hypothesized that this behavior results from a repeating partial TDE (rpTDE), such that prompt dimmings/shutoffs are coincident with the return of the star to pericenter and rebrightening…
An X-Ray and Radio View of the 2022 Reactivation of the Magnetar SGR J1935+2154
Campana, S.; Tiengo, A.; Götz, D. +19 more
Recently, the Galactic magnetar SGR J1935+2154 has garnered attention due to its emission of an extremely luminous radio burst, reminiscent of fast radio bursts (FRBs). SGR J1935+2154 is one of the most active magnetars, displaying flaring events nearly every year, including outbursts as well as short and intermediate bursts. Here, we present our …
Tomographic Imaging of the Sagittarius Spiral Arm's Magnetic Field Structure
Bastien, Pierre; Coudé, Simon; Hasegawa, Tetsuo +16 more
The Galactic global magnetic field is thought to play a vital role in shaping Galactic structures such as spiral arms and giant molecular clouds. However, our knowledge of magnetic field structures in the Galactic plane at different distances is limited, as measurements used to map the magnetic field are the integrated effect along the line of sig…
Investigating the Drivers of Electron Temperature Variations in H II Regions with Keck-KCWI and VLT-MUSE
Sandstrom, Karin M.; Glover, Simon C. O.; Klessen, Ralf S. +12 more
H II region electron temperatures are a critical ingredient in metallicity determinations, and recent observations have revealed systematic variations in the temperatures measured using different ions. We present electron temperatures (T e ) measured using the optical auroral lines ([N II]λ5756, [O II]λ λ7320, 7330, [S II]λ λ4069, 4076…
Exploring the Gas-phase Metallicity Gradients of Star-forming Galaxies at Cosmic Noon
Cleri, Nikko J.; Giavalisco, Mauro; Ji, Zhiyuan +3 more
We explore the relationships between the [O/H] gas-phase metallicity radial gradients and multiple galaxy properties for 238 star-forming galaxies at 0.6 < z < 2.6 selected from the CANDELS Lyα Emission at Reionization survey with stellar mass $8.5\lt \mathrm{log}\,{M}_{* }/{M}_{\odot }\lt 10.5$ . The gradients cover the range from ‑0.11 to …
The Massive and Distant Clusters of WISE Survey 2: Equatorial First Data Release
Connor, Thomas; Gonzalez, Anthony H.; Stanford, S. A. +7 more
The Massive and Distant Clusters of WISE Survey 2 (MaDCoWS2) is a new survey designed as the successor of the original MaDCoWS survey. MaDCoWS2 improves upon its predecessor by using deeper optical and infrared data and a more powerful detection algorithm (PZWav). As input to the search, we use grz photometry from the DECam Legacy Survey (DECaLS) …