Search Publications
ZFOURGE: Using Composite Spectral Energy Distributions to Characterize Galaxy Populations at 1 < z < 4
Papovich, Casey; Kacprzak, Glenn G.; Glazebrook, Karl +12 more
We investigate the properties of galaxies as they shut off star formation over the 4 billion years surrounding peak cosmic star formation. To do this, we categorize ∼7000 galaxies from 1 < z < 4 into 90 groups based on the shape of their spectral energy distributions (SEDs) and build composite SEDs with R ∼ 50 resolution. These composite SED…
Y Dwarf Trigonometric Parallaxes from the Spitzer Space Telescope
Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R. +12 more
Y dwarfs provide a unique opportunity to study free-floating objects with masses <30 M Jup and atmospheric temperatures approaching those of known Jupiter-like exoplanets. Obtaining distances to these objects is an essential step toward characterizing their absolute physical properties. Using Spitzer’s Infrared Array Camera (IRAC) [4…
Confined pseudo-shocks as an energy source for the active solar corona
Stangalini, Marco; Kayshap, Pradeep; Dwivedi, Bhola N. +7 more
The Sun's active corona requires an energy flux of 103 W m-2 to compensate for radiative losses and to maintain its high temperature1. Plasma moves in the corona through magnetic loops2,3, which may be connected with the flows in and around sunspots4-6. Global energizing processes (for example…
The Discovery of a Gravitationally Lensed Supernova Ia at Redshift 2.22
Stern, D.; Huang, X.; Amanullah, R. +33 more
We present the discovery and measurements of a gravitationally lensed supernova (SN) behind the galaxy cluster MOO J1014+0038. Based on multi-band Hubble Space Telescope and Very Large Telescope (VLT) photometry of the supernova, and VLT spectroscopy of the host galaxy, we find a 97.5% probability that this SN is a SN Ia, and a 2.5% chance of a CC…
Clustering the Orion B giant molecular cloud based on its molecular emission
Peretto, Nicolas; Pety, Jérôme; Öberg, Karin +12 more
Context. Previous attempts at segmenting molecular line maps of molecular clouds have focused on using position-position-velocity data cubes of a single molecular line to separate the spatial components of the cloud. In contrast, wide field spectral imaging over a large spectral bandwidth in the (sub)mm domain now allows one to combine multiple mo…
Beta Dips in the Gaia Era: Simulation Predictions of the Galactic Velocity Anisotropy Parameter (β) for Stellar Halos
Bell, Eric F.; Hattori, Kohei; Quinn, Thomas R. +7 more
The velocity anisotropy parameter, β, is a measure of the kinematic state of orbits in the stellar halo, which holds promise for constraining the merger history of the Milky Way (MW). We determine global trends for β as a function of radius from three suites of simulations, including accretion-only and cosmological hydrodynamic simulations. We fin…
A Complete Census of Luminous Stellar Variability on Day to Decade Timescales
Dolphin, Andrew E.; van Dokkum, Pieter; Conroy, Charlie +6 more
Stellar photometric variability offers a novel probe of the interior structure and evolutionary state of stars. Here we present a census of stellar variability on day to decade timescales across the color-magnitude diagram (CMD) for 73,000 stars brighter than M I,814 = -5 in the Whirlpool Galaxy (M51). Our Cycle 24 Hubble Space Telescop…
A multi-instrument non-parametric reconstruction of the electron pressure profile in the galaxy cluster CLJ1226.9+3332
Aussel, H.; Adam, R.; Benoît, A. +37 more
Context. In the past decade, sensitive, resolved Sunyaev-Zel'dovich (SZ) studies of galaxy clusters have become common. Whereas many previous SZ studies have parameterized the pressure profiles of galaxy clusters, non-parametric reconstructions will provide insights into the thermodynamic state of the intracluster medium. Aim. We seek to recover t…
A revised estimate of the distance to the clouds in the Chamaeleon complex using the Tycho-Gaia Astrometric Solution
Manara, Carlo F.; Prusti, Timo; Voirin, Jordan
Context. The determination of the distance to dark star-forming clouds is a key parameter to derive the properties of the cloud itself and of its stellar content. This parameter is still loosely constrained even in nearby star-forming regions. Aim. We want to determine the distances to the clouds in the Chamaeleon-Musca complex and explore the con…
High-precision multiwavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b
Bouchy, F.; Magain, P.; Queloz, D. +14 more
We present 16 occultation and three transit light curves for the ultra-short period hot Jupiter WASP-103b, in addition to five new radial velocity measurements. We combine these observations with archival data and perform a global analysis of the resulting extensive data set, accounting for the contamination from a nearby star. We detect the therm…