Search Publications
First Identification of 10 kpc [C II] 158 µm Halos around Star-forming Galaxies at z = 5-7
Ouchi, Masami; Ivison, R. J.; Fujimoto, Seiji +7 more
We report the discovery of 10 kpc [C II] 158 µm halos surrounding star-forming galaxies in the early universe. We choose deep Atacama Large Millimeter/submillimeter Array data for 18 galaxies, each with a star formation rate of ≃10-70 M ⊙ with no signature of an active galactic nucleus whose [C II] lines are individually detected …
Constraining the Metallicities, Ages, Star Formation Histories, and Ionizing Continua of Extragalactic Massive Star Populations
Dahle, H.; Rigby, J. R.; Sharon, K. +4 more
We infer the properties of massive star populations using the far-ultraviolet stellar continua of 61 star-forming galaxies: 42 at low redshift observed with the Hubble Space Telescope and 19 at z ∼ 2 from the MEGaSaURA sample. We fit each stellar continuum with a linear combination of up to 50 single-age and single-metallicity STARBURST99 models. …
Rotation Curve of the Milky Way from Classical Cepheids
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +7 more
Flat rotation curves of spiral galaxies are considered as an evidence for dark matter, but the rotation curve of the Milky Way is difficult to measure. Various objects were used to track the rotation curve in the outer parts of the Galaxy, but most studies rely on incomplete kinematical information and inaccurate distances. Here, we use a sample o…
Late-time UV Observations of Tidal Disruption Flares Reveal Unobscured, Compact Accretion Disks
Brown, Thomas M.; Fruchter, Andrew S.; Stone, Nicholas C. +3 more
The origin of thermal optical and UV emission from stellar tidal disruption flares (TDFs) remains an open question. We present Hubble Space Telescope far-UV (FUV) observations of eight optical/UV-selected TDFs 5-10 yr post-peak. Six sources are cleanly detected, showing point-like FUV emission ({10}41.5{--42.5} {erg} {{{s}}}-1
The Next Generation Virgo Cluster Survey. XXIII. Fundamentals of Nuclear Star Clusters over Seven Decades in Galaxy Mass
Emsellem, Eric; Liu, Chengze; Cuillandre, Jean-Charles +25 more
Using deep, high-resolution optical imaging from the Next Generation Virgo Cluster Survey, we study the properties of nuclear star clusters (NSCs) in a sample of nearly 400 quiescent galaxies in the core of Virgo with stellar masses 105 ≲ {\text{}}{M}* /{\text{}}{M}⊙ ≲ 1012. The nucleation fraction reac…
The Atmospheric Circulation of Ultra-hot Jupiters
Tan, Xianyu; Komacek, Thaddeus D.
Recent observations of ultra-hot Jupiters with dayside temperatures in excess of 2500 K have found evidence for new physical processes at play in their atmospheres. In this work, we investigate the effects of the dissociation of molecular hydrogen and recombination of atomic hydrogen on the atmospheric circulation of ultra-hot Jupiters. To do so, …
Inferred Evidence for Dark Matter Kinematic Substructure with SDSS-Gaia
Belokurov, Vasily; Lisanti, Mariangela; Necib, Lina
We use the distribution of accreted stars in Sloan Digital Sky Survey-Gaia DR2 to demonstrate that a nontrivial fraction of the dark matter halo within galactocentric radii of 7.5-10 kpc and | z| > 2.5 {kpc} is in substructure and thus may not be in equilibrium. Using a mixture likelihood analysis, we separate the contributions of an old, isotr…
The KMOS3D Survey: Data Release and Final Survey Paper
Wuyts, E.; Lutz, D.; Wuyts, S. +28 more
We present the completed KMOS3D survey, an integral field spectroscopic survey of 739 {log}({M}\star /{M}⊙ )> 9 galaxies at 0.6 < z < 2.7 using the K-band Multi Object Spectrograph (KMOS) at the Very Large Telescope. The KMOS3D survey provides a population-wide census of kinematics, star formati…
Nonparametric Star Formation History Reconstruction with Gaussian Processes. I. Counting Major Episodes of Star Formation
Ferguson, Henry C.; Koekemoer, Anton M.; Somerville, Rachel S. +5 more
The star formation histories (SFHs) of galaxies contain imprints of the physical processes responsible for regulating star formation during galaxy growth and quenching. We improve the Dense Basis SFH reconstruction method of Iyer & Gawiser, introducing a nonparametric description of the SFH based on the lookback times at which a galaxy assembl…
The Anomalously Low (Sub)Millimeter Spectral Indices of Some Protoplanetary Disks May Be Explained By Dust Self-scattering
Liu, Hauyu Baobab
Previous (sub)millimeter observations have found that the spectral indices of dust emission from some young stellar objects are lower than that of the blackbody emission in the Rayleigh-Jeans limit (i.e., 2.0). In particular, the recent Atacama Large Millimeter Array observations have spatially resolved that the innermost regions of the protoplane…