Search Publications
The Stellar Mass Function in CANDELS and Frontier Fields: The Buildup of Low-mass Passive Galaxies since z 3
Santini, Paola; Calabrò, Antonello; Castellano, Marco +8 more
Despite significant efforts in recent years, the physical processes responsible for the formation of passive galaxies through cosmic time remain unclear. The shape and evolution of the stellar mass function (SMF) give an insight into these mechanisms. Taking advantage of the CANDELS and the deep Hubble Frontier Fields (HFF) programs, we estimated …
Monochromatic Globular Clusters as a Critical Test of Formation Models for the Dark Matter-deficient Galaxies NGC 1052-DF2 and NGC 1052-DF4
van Dokkum, Pieter; Romanowsky, Aaron J.; Conroy, Charlie +8 more
It was recently proposed that the dark matter-deficient ultradiffuse galaxies DF2 and DF4 in the NGC 1052 group could be the products of a "bullet dwarf" collision between two gas-rich progenitor galaxies. In this model, DF2 and DF4 formed at the same time in the immediate aftermath of the collision, and a strong prediction is that their globular …
LoTSS Jellyfish Galaxies. IV. Enhanced Star Formation on the Leading Half of Cluster Galaxies and Gas Compression in IC3949
Ellison, Sara L.; Lin, Lihwai; Pan, Hsi-An +7 more
With Mapping Nearby Galaxies at APO integral field spectroscopy, we present a resolved analysis of star formation for 29 jellyfish galaxies in nearby clusters, identified from radio continuum imaging taken by the Low Frequency Array. Simulations predict enhanced star formation on the "leading half" (LH) of galaxies undergoing ram pressure strippin…
Role of Magnetic Fields in Fueling Seyfert Nuclei
Beck, Rainer; Lazarian, A.; Hu, Yue +1 more
Molecular gas is believed to be the fuel for star formation and nuclear activity in Seyfert galaxies. To explore the role of magnetic fields in funneling molecular gas into the nuclear region, measurements of the magnetic fields embedded in molecular gas are needed. By applying the new velocity gradient technique (VGT) to CO isotopolog data from t…
Hubble Space Telescope Observations of GW170817: Complete Light Curves and the Properties of the Galaxy Merger of NGC 4993
Kilpatrick, Charles D.; Leja, Joel; Fong, Wen-fai +10 more
We present the complete set of Hubble Space Telescope imaging of the binary neutron star merger GW170817 and its optical counterpart AT 2017gfo. Including deep template imaging in F814W, F110W, F140W, and F160W at 3.4 yr post-merger, we reanalyze the full light curve of AT 2017gfo across 12 bands from 5 to 1273 rest-frame days after merger. We obt…
Properties of Host Galaxies of Submillimeter Sources as Revealed by JWST Early Release Observations in SMACS J0723.3-7327
Yan, Haojing; Cheng, Cheng; Willmer, Christopher N. A. +3 more
Using the 0.9-4.4 µm imaging data from the James Webb Space Telescope (JWST) early release observation in the SMACS J0723.3-7327 galaxy cluster field, we discuss the properties of three submillimeter galaxies (SMGs) detected by the Atacama Large Millimeter/submillimeter Array Array. These sources are magnified by 1.4-2.1 × due to gravitation…
Patches of Magnetic Switchbacks and Their Origins
de Wit, Thierry Dudok; Velli, Marco; Bale, Stuart D. +18 more
Parker Solar Probe (PSP) has shown that the solar wind in the inner heliosphere is characterized by the quasi omnipresence of magnetic switchbacks ("switchback" hereinafter), local backward bends of magnetic field lines. Switchbacks also tend to come in patches, with a large-scale modulation that appears to have a spatial scale size comparable to …
A Maximum Likelihood Calibration of the Tip of the Red Giant Branch Luminosity from High Latitude Field Giants Using Gaia Early Data Release 3 Parallaxes
Casertano, Stefano; Li, Siyang; Riess, Adam G.
The calibration of the tip of the red giant branch (TRGB) in the I band has a direct role in determinations of the Hubble constant, a subject of recent interest due to the discrepancy between direct and indirect estimates of its value. We present a maximum likelihood method designed to obtain an independent calibration of the brightness of TRGB us…
Luminosities and Masses of Single Galactic Post-asymptotic Giant Branch Stars with Distances from Gaia EDR3: The Revelation of an s-process Diversity
Ventura, Paolo; Van Winckel, Hans; Hrivnak, Bruce J. +4 more
Post-asymptotic giant branch (AGB) stars are exquisite probes of AGB nucleosynthesis. However, the previous lack of accurate distances jeopardized comparison with theoretical AGB models. The Gaia Early Data Release 3 (Gaia EDR3) has now allowed for a breakthrough in this research landscape. In this study, we focus on a sample of single Galactic po…
Intrinsic Lyα Profiles of High-velocity G, K, and M Dwarfs
Redfield, Seth; France, Kevin; Youngblood, Allison +5 more
Observations of H I Lyman α, the brightest UV emission line of late-type stars, are critical for understanding stellar chromospheres and transition regions, modeling photochemistry in exoplanet atmospheres, and measuring the abundances of neutral hydrogen and deuterium in the interstellar medium. Yet Lyα observations are notoriously challenging ow…