Search Publications
A Measurement of Radius Inflation in the Pleiades and Its Relation to Rotation and Lithium Depletion
Stassun, Keivan G.; Somers, Garrett
Precise measurements of eclipsing binary parameters and statistical studies of young clusters have suggested that some magnetically active low-mass dwarfs possess radii inflated by ∼5%-15% relative to theoretical expectations. If true, this effect should be pronounced in young open clusters, due to the rapid rotation and strong magnetic activity o…
Probing the Hot X-Ray Corona around the Massive Spiral Galaxy, NGC 6753, Using Deep XMM-Newton Observations
Vogelsberger, Mark; Springel, Volker; Hernquist, Lars +4 more
X-ray emitting gaseous coronae around massive galaxies are a basic prediction of galaxy formation models. Although the coronae around spiral galaxies offer a fundamental test of these models, observational constraints on their characteristics are still scarce. While the presence of extended hot coronae has been established around a handful of mass…
Mass distribution in the core of MACS J1206. Robust modeling from an exceptionally large sample of central multiple images
Zitrin, A.; Grillo, C.; Tozzi, P. +25 more
We present a new strong lensing analysis of the galaxy cluster MACS J1206.2-0847 (MACS 1206), at z = 0.44, using deep spectroscopy from CLASH-VLT and VLT/MUSE archival data in combination with imaging from the Cluster Lensing and Supernova survey with Hubble. MUSE observations enable the spectroscopic identification of 23 new multiply imaged sourc…
Revealing the ultrafast outflow in IRAS 13224-3809 through spectral variability
Fabian, A. C.; Reynolds, C. S.; Pinto, C. +6 more
We present an analysis of the long-term X-ray variability of the extreme narrow-line Seyfert 1 galaxy IRAS 13224-3809 using principal component analysis (PCA) and fractional excess variability (Fvar) spectra to identify model-independent spectral components. We identify a series of variability peaks in both the first PCA component and F…
Nature of the absorbing gas associated with a galaxy group at z∼0.4
Pettini, Max; York, Donald G.; Husemann, Bernd +6 more
We present new Multi Unit Spectroscopic Explorer observations of quasar field Q2131-1207 with a log N(H I} = 19.50 ± 0.15 sub-damped Lyman α at zabs = 0.42980. We detect four galaxies at a redshift consistent with that of the absorber where only one was known before this study. Two of these are star-forming galaxies, while the ones furt…
The metallicity of the intracluster medium over cosmic time: further evidence for early enrichment
Allen, Steven W.; Simionescu, Aurora; Werner, Norbert +4 more
We use Chandra X-ray data to measure the metallicity of the intracluster medium (ICM) in 245 massive galaxy clusters selected from X-ray and Sunyaev-Zel'dovich (SZ) effect surveys, spanning redshifts 0 < z < 1.2. Metallicities were measured in three different radial ranges, spanning cluster cores through their outskirts. We explore trends in…
The Galaxy End Sequence
Smith, Matthew W. L.; Eales, Stephen; Ciesla, Laure +4 more
A common assumption is that galaxies fall in two distinct regions of a plot of specific star formation rate (SSFR) versus galaxy stellar mass: a star-forming galaxy main sequence (GMS) and a separate region of 'passive' or 'red and dead galaxies'. Starting from a volume-limited sample of nearby galaxies designed to contain most of the stellar mass…
Disk Masses for Embedded Class I Protostars in the Taurus Molecular Cloud
Sheehan, Patrick D.; Eisner, Josh A.
Class I protostars are thought to represent an early stage in the lifetime of protoplanetary disks, when they are still embedded in their natal envelope. Here we measure the disk masses of 10 Class I protostars in the Taurus Molecular Cloud to constrain the initial mass budget for forming planets in disks. We use radiative transfer modeling to pro…
The Lyman Continuum Escape Fraction of Emission Line-selected z ∼ 2.5 Galaxies Is Less Than 15%
Koekemoer, Anton M.; Teplitz, Harry I.; Rutkowski, Michael J. +9 more
Recent work suggests that strong emission line, star-forming galaxies (SFGs) may be significant Lyman continuum leakers. We combine archival Hubble Space Telescope broadband ultraviolet and optical imaging (F275W and F606W, respectively) with emission line catalogs derived from WFC3 IR G141 grism spectroscopy to search for escaping Lyman continuum…
Revisiting the field geology of Taurus-Littrow
Weiss, B. P.; Robinson, M. S.; Petro, N. E. +3 more
Integration of Apollo 17 field observations and photographs, sample investigations, Lunar Reconnaissance Orbiter Camera images, Chandrayaan-1 Moon Mineralogy Mapper (M3) spectra, and Miniature Radio Frequency (Mini-RF) S-band radar images provides new insights into the geology of the valley of Taurus-Littrow on the Moon. Connecting the …