Search Publications
CLEAR: The Ionization and Chemical-enrichment Properties of Galaxies at 1.1 < z < 2.3
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +15 more
We use deep spectroscopy from the Hubble Space Telescope Wide-Field-Camera 3 IR grisms combined with broadband photometry to study the stellar populations, gas ionization and chemical abundances in star-forming galaxies at z ~ 1.1-2.3. The data stem from the CANDELS Lyα Emission At Reionization (CLEAR) survey. At these redshifts, the grism spectro…
CLEAR: Emission-line Ratios at Cosmic High Noon
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +10 more
We use Hubble Space Telescope Wide Field Camera 3 G102 and G141 grism spectroscopy to measure rest-frame optical emission-line ratios of 533 galaxies at z ~ 1.5 in the CANDELS Lyα Emission at Reionization survey. We compare [O III]/Hβ versus [S II]/(Hα + [N II]) as an "unVO87" diagram for 461 galaxies and [O III]/Hβ versus [Ne III]/[O II] as an "O…
Molecules with ALMA at Planet-forming Scales (MAPS): A Circumplanetary Disk Candidate in Molecular-line Emission in the AS 209 Disk
Zhang, Ke; Wilner, David J.; Ménard, François +29 more
We report the discovery of a circumplanetary disk (CPD) candidate embedded in the circumstellar disk of the T Tauri star AS 209 at a radial distance of about 200 au (on-sky separation of 1.″4 from the star at a position angle of 161°), isolated via 13CO J = 2-1 emission. This is the first instance of CPD detection via gaseous emission c…
Anomalous Flux in the Cosmic Optical Background Detected with New Horizons Observations
Buratti, Bonnie J.; Singer, Kelsi N.; Schenk, Paul M. +27 more
We used New Horizons LORRI images to measure the optical-band (0.4 ≲ λ ≲ 0.9µm) sky brightness within a high-galactic-latitude field selected to have reduced diffuse scattered light from the Milky Way galaxy (DGL), as inferred from the IRIS all-sky 100 µm map. We also selected the field to significantly reduce the scattered light from …
X-Ray Coronal Properties of Swift/BAT-selected Seyfert 1 Active Galactic Nuclei
Ricci, Claudio; Stern, Daniel; Urry, C. Megan +9 more
The corona is an integral component of active galactic nuclei (AGNs) which produces the bulk of the X-ray emission above 1-2 keV. However, many of its physical properties and the mechanisms powering this emission remain a mystery. In particular, the temperature of the coronal plasma has been difficult to constrain for large samples of AGNs, as con…
The Recent LMC-SMC Collision: Timing and Impact Parameter Constraints from Comparison of Gaia LMC Disk Kinematics and N-body Simulations
Choi, Yumi; van der Marel, Roeland P.; Nidever, David L. +4 more
We present analysis of the proper-motion (PM) field of the red clump stars in the Large Magellanic Cloud (LMC) disk using the Gaia Early Data Release 3 catalog. Using a kinematic model based on old stars with 3D velocity measurements, we construct the residual PM field by subtracting the center-of-mass motion and internal rotation motion component…
Luminous Supernovae: Unveiling a Population between Superluminous and Normal Core-collapse Supernovae
Berger, Edo; Nicholl, Matt; Hosseinzadeh, Griffin +2 more
Stripped-envelope core-collapse supernovae can be divided into two broad classes: the common Type Ib/c supernovae (SNe Ib/c), powered by the radioactive decay of 56Ni, and the rare superluminous supernovae (SLSNe), most likely powered by the spin-down of a magnetar central engine. Up to now, the intermediate regime between these two pop…
Luminous Millimeter, Radio, and X-Ray Emission from ZTF 20acigmel (AT 2020xnd)
Kaplan, David L.; Petitpas, Glen; Perley, Daniel A. +7 more
Observations of the extragalactic (z = 0.0141) transient AT 2018cow established a new class of energetic explosions shocking a dense medium, producing luminous emission at millimeter and submillimeter wavelengths. Here we present detailed millimeter- through centimeter-wave observations of a similar transient, ZTF 20acigmel (AT 2020xnd), at z = 0.…
ALMA Reveals Extended Cool Gas and Hot Ionized Outflows in a Typical Star-forming Galaxy at Z = 7.13
Richard, Johan; Fujimoto, Seiji; Inoue, Akio K. +9 more
We present spatially resolved morphological properties of [C II] 158 µm, [O III] 88 µm, dust, and rest-frame ultraviolet (UV) continuum emission for A1689-zD1, a strongly lensed, sub-L* galaxy at z = 7.13, by utilizing deep Atacama Large Millimeter/submillimeter Array (ALMA) and Hubble Space Telescope (HST) observations. While the [O I…
Probing the Physics of the Solar Atmosphere with the Multi-slit Solar Explorer (MUSE). II. Flares and Eruptions
Reeves, Katharine K.; Polito, Vanessa; Golub, Leon +25 more
Current state-of-the-art spectrographs cannot resolve the fundamental spatial (subarcseconds) and temporal (less than a few tens of seconds) scales of the coronal dynamics of solar flares and eruptive phenomena. The highest-resolution coronal data to date are based on imaging, which is blind to many of the processes that drive coronal energetics a…