Search Publications
Relations between the Sizes of Galaxies and Their Dark Matter Halos at Redshifts 0 < z < 3
Pérez-González, Pablo G.; Ferguson, Henry C.; van der Wel, Arjen +6 more
We derive relations between the effective radii R eff of galaxies and the virial radii R 200c of their dark matter halos over the redshift range 0 < z < 3. For galaxies, we use the measured sizes from deep images taken with Hubble Space Telescope for the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey; f…
A Physical Model-based Correction for Charge Traps in the Hubble Space Telescope’s Wide Field Camera 3 Near-IR Detector and Its Applications to Transiting Exoplanets and Brown Dwarfs
Schneider, Glenn; Apai, Dániel; Zhou, Yifan +1 more
The Hubble Space Telescope Wide Field Camera 3 (WFC3) near-IR channel is extensively used in time-resolved observations, especially for transiting exoplanet spectroscopy as well as brown dwarf and directly imaged exoplanet rotational phase mapping. The ramp effect is the dominant source of systematics in the WFC3 for time-resolved observations, wh…
Solar abundance ratios of the iron-peak elements in the Perseus cluster
Done, Chris; Safi-Harb, Samar; Hamaguchi, Kenji +191 more
The metal abundance of the hot plasma that permeates galaxy clusters represents the accumulation of heavy elements produced by billions of supernovae. Therefore, X-ray spectroscopy of the intracluster medium provides an opportunity to investigate the nature of supernova explosions integrated over cosmic time. In particular, the abundance of the ir…
Venus Surface Composition Constrained by Observation and Experiment
Helbert, Jörn; Gilmore, Martha; Treiman, Allan +1 more
New observations from the Venus Express spacecraft as well as theoretical and experimental investigation of Venus analogue materials have advanced our understanding of the petrology of Venus melts and the mineralogy of rocks on the surface. The VIRTIS instrument aboard Venus Express provided a map of the southern hemisphere of Venus at ∼1 µm…
Infrared spectroscopy of eruptive variable protostars from VVV
Minniti, D.; Marocco, F.; Lucas, P. W. +11 more
In a companion work (Paper I), we detected a large population of highly variable Young Stellar Objects (YSOs) in the Vista Variables in the Via Lactea (VVV) survey, typically with class I or flat spectrum spectral energy distributions and diverse light-curve types. Here we present infrared spectra (0.9-2.5 µm) of 37 of these variables, many …
Connection between Stellar Mass Distributions within Galaxies and Quenching Since z = 2
Tacchella, Sandro; Renzini, Alvio; Onodera, Masato +5 more
We study the history from z∼ 2 to z∼ 0 of the stellar mass assembly of quiescent and star-forming galaxies in a spatially resolved fashion. For this purpose, we use multi-wavelength imaging data from the Hubble Space Telescope (HST) over the GOODS fields and the Sloan Digital Sky Survey (SDSS) for the local population. We present the radial stella…
Gemini Near Infrared Field Spectrograph Observations of the Seyfert 2 Galaxy Mrk 573: In Situ Acceleration of Ionized and Molecular Gas off Fueling Flows
Kraemer, S. B.; Crenshaw, D. M.; Storchi-Bergmann, T. +9 more
We present near-infrared and optical emission-line and stellar kinematics of the Seyfert 2 galaxy Mrk 573 using the Near-Infrared Field Spectrograph (NIFS) at Gemini North and Dual Imaging Spectrograph at Apache Point Observatory, respectively. By obtaining full kinematic maps of the infrared ionized and molecular gas and stellar kinematics in a ∼…
A Measurement of the Galaxy Group-Thermal Sunyaev-Zel'dovich Effect Cross-Correlation Function
Jain, Bhuvnesh; Lidz, Adam; Vikram, Vinu
Stacking cosmic microwave background maps around known galaxy clusters and groups provides a powerful probe of the distribution of hot gas in these systems via the Sunyaev-Zel'dovich (SZ) effect. A stacking analysis allows one to detect the average SZ signal around low-mass haloes, to extend measurements out to large scales and measure the redshif…
A uniform metallicity in the outskirts of massive, nearby galaxy clusters
Simionescu, A.; Allen, S. W.; Werner, N. +2 more
Suzaku measurements of a homogeneous metal distribution of Z ∼ 0.3 Solar in the outskirts of the nearby Perseus cluster suggest that chemical elements were deposited and mixed into the intergalactic medium before clusters formed, likely over 10 billion years ago. A key prediction of this early enrichment scenario is that the intracluster medium in…
Asymptotic g modes: Evidence for a rapid rotation of the solar core
Provost, J.; Corbard, T.; Turck-Chièze, S. +11 more
Context. Over the past 40 years, helioseismology has been enormously successful in the study of the solar interior. A shortcoming has been the lack of a convincing detection of the solar g modes, which are oscillations driven by gravity and are hidden in the deepest part of the solar body - its hydrogen-burning core. The detection of g modes is ex…