Search Publications
Multiple Channels for the Onset of Magnetism in Isolated White Dwarfs
Landstreet, John D.; Bagnulo, Stefano
The presence of a strong magnetic field is a feature common to a significant fraction of degenerate stars, yet little is understood about the field's origin and evolution. New observational constraints from volume-limited surveys point to a more complex situation than a single mechanism valid for all stars. We show that in high-mass white dwarfs, …
GOALS-JWST: Tracing AGN Feedback on the Star-forming Interstellar Medium in NGC 7469
Inami, Hanae; Böker, Torsten; Law, David R. +34 more
We present James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) integral-field spectroscopy of the nearby merging, luminous infrared galaxy, NGC 7469. This galaxy hosts a Seyfert type-1.5 nucleus, a highly ionized outflow, and a bright, circumnuclear star-forming ring, making it an ideal target to study active galactic nucleus (AGN) fe…
Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS
Santini, Paola; Castellano, Marco; Fontana, Adriano +29 more
We present the first search for z ≥ 7, continuum-confirmed Lyman break sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST-ERS survey. With ~15 hr of preimaging and multiangle grism exposures in the F115W, F150W, and F200W filters, we describe the general data handling (i.e., reduction, clean…
NGC 5846-UDG1: A Galaxy Formed Mostly by Star Formation in Massive, Extremely Dense Clumps of Gas
van Dokkum, Pieter; Romanowsky, Aaron J.; Conroy, Charlie +10 more
It has been shown that ultra-diffuse galaxies (UDGs) have higher specific frequencies of globular clusters, on average, than other dwarf galaxies with similar luminosities. The UDG NGC 5846-UDG1 is among the most extreme examples of globular cluster-rich galaxies found so far. Here we present new Hubble Space Telescope observations and analysis of…
Sizes of Lensed Lower-luminosity z = 4-8 Galaxies from the Hubble Frontier Field Program
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +3 more
We constrain the rest-UV size-luminosity relation for star-forming galaxies at z ~ 4 and z ~ 6, 7, and 8 identified behind clusters from the Hubble Frontier Fields (HFF) program. The size-luminosity relation is key to deriving accurate luminosity functions (LF) for faint galaxies. Making use of the latest lensing models and full data set for these…
High Equivalent Width of Hα+[N II] Emission in z 8 Lyman-break Galaxies from IRAC 5.8 µm Observations: Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization
Illingworth, Garth D.; Labbé, Ivo; Bouwens, Rychard J. +3 more
We measure, for the first time, the median equivalent width (EW) of Hα+[N II] in star-forming galaxies at z ~ 8. Our estimate leverages the unique photometric depth of the Spitzer/IRAC 5.8 µm band mosaics (probing ≈5500-7100 Å at z ~ 8) of the GOODS Reionization Era Wide Area Treasury from Spitzer (GREATS) program. We median-stacked the stam…
Gas Disk Sizes from CO Line Observations: A Test of Angular Momentum Evolution
Wilner, David J.; Tabone, Benoît; Andrews, Sean M. +7 more
The size of a disk encodes important information about its evolution. Combining new Submillimeter Array observations with archival Atacama Large Millimeter/submillimeter Array data, we analyze millimeter continuum and CO emission line sizes for a sample of 44 protoplanetary disks around stars with masses of 0.15-2 M ⊙ in several nearby …
Cosmological Results from the RAISIN Survey: Using Type Ia Supernovae in the Near Infrared as a Novel Path to Measure the Dark Energy Equation of State
Kirshner, R. P.; Smith, M.; Nichol, R. C. +26 more
Type Ia supernovae (SNe Ia) are more precise standardizable candles when measured in the near-infrared (NIR) than in the optical. With this motivation, from 2012 to 2017 we embarked on the RAISIN program with the Hubble Space Telescope (HST) to obtain rest-frame NIR light curves for a cosmologically distant sample of 37 SNe Ia (0.2 ≲ z ≲ 0.6) disc…
ALMA 200 pc Imaging of a z 7 Quasar Reveals a Compact, Disk-like Host Galaxy
Carilli, Chris; Fan, Xiaohui; Neeleman, Marcel +10 more
We present 0.″035 resolution (~200 pc) imaging of the 158 µm [C II] line and the underlying dust continuum of the z = 6.9 quasar J234833.34-305410.0. The 18 hour Atacama Large Millimeter/submillimeter Array observations reveal extremely compact emission (diameter ~1 kpc) that is consistent with a simple, almost face-on, rotation-supported di…
First Results from the JWST Early Release Science Program Q3D: Turbulent Times in the Life of a z 3 Extremely Red Quasar Revealed by NIRSpec IFU
Johnson, Sean D.; Lützgendorf, Nora; Maiolino, Roberto +20 more
Extremely red quasars, with bolometric luminosities exceeding 1047 erg s-1, are a fascinating high-redshift population that is absent in the local universe. They are the best candidates for supermassive black holes accreting at rates at or above the Eddington limit, and they are associated with the most rapid and powerful out…