Search Publications
The Mass, Color, and Structural Evolution of Today’s Massive Galaxies Since z ∼ 5
Franx, Marijn; Muzzin, Adam; van Dokkum, Pieter +12 more
In this paper, we use stacking analysis to trace the mass growth, color evolution, and structural evolution of present-day massive galaxies ({log}({M}* /{M}⊙ )=11.5) out to z = 5. We utilize the exceptional depth and area of the latest UltraVISTA data release, combined with the depth and unparalleled seeing of CANDELS to gath…
Connecting Clump Sizes in Turbulent Disk Galaxies to Instability Theory
Glazebrook, Karl; Bolatto, Alberto D.; Obreschkow, Danail +8 more
In this letter we study the mean sizes of Hα clumps in turbulent disk galaxies relative to kinematics, gas fractions, and Toomre Q. We use ∼100 pc resolution HST images, IFU kinematics, and gas fractions of a sample of rare, nearby turbulent disks with properties closely matched to z∼ 1.5{--}2 main-sequence galaxies (the DYNAMO sample). We find li…
The MOSDEF Survey: Metallicity Dependence of PAH Emission at High Redshift and Implications for 24 µm Inferred IR Luminosities and Star Formation Rates at z ∼ 2
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +9 more
We present results on the variation of 7.7 µm polycyclic aromatic hydrocarbon (PAH) emission in galaxies spanning a wide range in metallicity at z ∼ 2. For this analysis, we use rest-frame optical spectra of 476 galaxies at 1.37 ≤ z ≤ 2.61 from the MOSFIRE Deep Evolution Field (MOSDEF) survey to infer metallicities and ionization states. Spi…
Hubble Space Telescope Detection of the Millisecond Pulsar J2124-3358 and its Far-ultraviolet Bow Shock Nebula
van Kerkwijk, M. H.; Pavlov, G. G.; Guillot, S. +4 more
We observed the nearby millisecond pulsar J2124-3358 with the Hubble Space Telescope in broad far-UV (FUV) and optical filters. The pulsar is detected in both bands with fluxes F(1250-2000 Å) = (2.5 ± 0.3) × 10-16 erg s-1 cm-2 and F(3800-6000 Å) = (6.4 ± 0.4) × 10-17 erg s-1 cm-2, w…
A Model of the Hα and Na Transmission Spectrum of HD 189733b
Arras, Phil; Li, Zhi-Yun; Christie, Duncan +1 more
This paper presents a detailed hydrostatic model of the upper atmosphere of HD 189733b, with the goal of constraining its temperature, particle densities, and radiation field over the pressure range 10-4 to 10 µbar, where the observed Hα transmission spectrum is produced. The atomic hydrogen level population is computed including …
Spectroscopy and Photometry of Multiple Populations along the Asymptotic Giant Branch of NGC 2808 and NGC 6121 (M4)
Milone, A. P.; Marino, A. F.; Bedin, L. R. +8 more
We present a photometric and spectroscopic study of multiple populations along the asymptotic giant branch (AGB) of the intermediate-metallicity globular clusters (GCs) NGC 2808 and NGC 6121 (M4). Chemical abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Fe, Co, Ni, Zn, Y, and Ce in AGB stars from high-resolution FLAMES+UVES@VLT spectra are rep…
Near-infrared MOSFIRE Spectra of Dusty Star-forming Galaxies at 0.2 < z < 4
Casey, Caitlin M.; Sanders, D. B.; Capak, Peter +6 more
We present near-infrared and optical spectroscopic observations of a sample of 450 and 850 µm-selected dusty star-forming galaxies (DSFGs) identified in a 400 arcmin2 area in the COSMOS field. Thirty-one sources of the 114 targets were spectroscopically confirmed at 0.2< z< 4, identified primarily in the near-infrared with K…
Extended Main-sequence Turn-offs in Intermediate-age Star Clusters: Stellar Rotation Diminishes, but Does Not Eliminate, Age Spreads
Girardi, Léo; Goudfrooij, Paul; Correnti, Matteo
Extended main-sequence turn-off (eMSTO) regions are a common feature in color-magnitude diagrams of young- and intermediate-age star clusters in the Magellanic Clouds. The nature of eMSTOs remains debated in the literature. The currently most popular scenarios are extended star formation activity and ranges of stellar rotation rates. Here we study…
Bimodal Long-lasting Components in Short Gamma-Ray Bursts: Promising Electromagnetic Counterparts to Neutron Star Binary Mergers
Sakamoto, Takanori; Kisaka, Shota; Ioka, Kunihito
Long-lasting emission of short gamma-ray bursts (GRBs) is crucial to reveal the physical origin of the central engine as well as to detect electromagnetic (EM) counterparts to gravitational waves (GWs) from neutron star binary mergers. We investigate 65 X-ray light curves of short GRBs, which is six times more than previous studies, by combining b…
Virgo Redux: The Masses and Stellar Content of Nuclei in Early-type Galaxies from Multiband Photometry and Spectroscopy
Cuillandre, Jean-Charles; Gwyn, Stephen; Côté, Patrick +14 more
We present an analysis of 39 nuclei and their early-type hosts in the Virgo Cluster using 10 broadband filters: F300W, F475W, F850LP, F160W, {u}* {\text{}}{griz}, and K s . We describe the Virgo Redux program, which provides high-resolution UV and NIR imaging. Combining this data with optical and NIR imaging from the ACS Vir…