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The Herschel Multi-tiered Extragalactic Survey: HerMES
Altieri, B.; Aussel, H.; Elbaz, D. +101 more
The Herschel Multi-tiered Extragalactic Survey (HerMES) is a legacy programme designed to map a set of nested fields totalling ∼380 deg2. Fields range in size from 0.01 to ∼20 deg2, using the Herschel-Spectral and Photometric Imaging Receiver (SPIRE) (at 250, 350 and 500 µm) and the Herschel-Photodetector Array Camera a…
Detection and Characterization of Exoplanets and Disks Using Projections on Karhunen-Loève Eigenimages
Pueyo, Laurent; Soummer, Rémi; Larkin, James
We describe a new method to achieve point-spread function (PSF) subtractions for high-contrast imaging using principal component analysis that is applicable to both point sources or extended objects (disks). Assuming a library of reference PSFs, a Karhunen-Loève transform of these references is used to create an orthogonal basis of eigenimages on …
3D-HST: A Wide-field Grism Spectroscopic Survey with the Hubble Space Telescope
Schmidt, Kasper B.; van Dokkum, Pieter G.; Franx, Marijn +27 more
We present 3D-HST, a near-infrared spectroscopic Treasury program with the Hubble Space Telescope for studying the physical processes that shape galaxies in the distant universe. 3D-HST provides rest-frame optical spectra for a sample of ~7000 galaxies at 1 < z < 3.5, the epoch when ~60% of all star formation took place, the number density o…
Coronal Mass Ejections: Observations
Howard, Timothy A.; Webb, David F.
Solar eruptive phenomena embrace a variety of eruptions, including flares, solar energetic particles, and radio bursts. Since the vast majority of these are associated with the eruption, development, and evolution of coronal mass ejections (CMEs), we focus on CME observations in this review. CMEs are a key aspect of coronal and interplanetary dyna…
Intrinsic disc emission and the soft X-ray excess in active galactic nuclei
Done, Chris; Ward, M.; Jin, C. +2 more
Narrow-line Seyfert 1 (NLS1) galaxies have low-mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should peak in the extreme ultraviolet. However, the lack of true absorption opacity in the disc means that the emission is better approximated by a colour temperature corrected blackbod…
Stellar Diameters and Temperatures. II. Main-sequence K- and M-stars
López-Morales, Mercedes; Muirhead, Philip S.; Kane, Stephen R. +21 more
We present interferometric angular diameter measurements of 21 low-mass, K- and M-dwarfs made with the CHARA Array. This sample is enhanced by adding a collection of radius measurements published in the literature to form a total data set of 33 K-M-dwarfs with diameters measured to better than 5%. We use these data in combination with the Hipparco…
The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
Dupuy, Trent J.; Liu, Michael C.
We present the first results from our high-precision infrared (IR) astrometry program at the Canada-France-Hawaii Telescope. We measure parallaxes for 83 ultracool dwarfs (spectral types M6-T9) in 49 systems, with a median uncertainty of 1.1 mas (2.3%) and as good as 0.7 mas (0.8%). We provide the first parallaxes for 48 objects in 29 systems, and…
New Constraints on the Evolution of the Stellar-to-dark Matter Connection: A Combined Analysis of Galaxy-Galaxy Lensing, Clustering, and Stellar Mass Functions from z = 0.2 to z =1
Koekemoer, Anton M.; Schrabback, Tim; Leauthaud, Alexie +20 more
Using data from the COSMOS survey, we perform the first joint analysis of galaxy-galaxy weak lensing, galaxy spatial clustering, and galaxy number densities. Carefully accounting for sample variance and for scatter between stellar and halo mass, we model all three observables simultaneously using a novel and self-consistent theoretical framework. …
A Revised Age for Upper Scorpius and the Star Formation History among the F-type Members of the Scorpius-Centaurus OB Association
Mamajek, Eric E.; Pecaut, Mark J.; Bubar, Eric J.
We present an analysis of the ages and star formation history of the F-type stars in the Upper Scorpius (US), Upper Centaurus-Lupus (UCL), and Lower Centaurus-Crux (LCC) subgroups of Scorpius-Centaurus (Sco-Cen), the nearest OB association. Our parent sample is the kinematically selected Hipparcos sample of de Zeeuw et al., restricted to the 138 F…
Scaling relations for galaxy clusters in the Millennium-XXL simulation
White, S. D. M.; Baugh, C. M.; Frenk, C. S. +3 more
We present a very large high-resolution cosmological N-body simulation, the Millennium-XXL or MXXL, which uses 303 billion particles to represent the formation of dark matter structures throughout a 4.1 Gpc box in a Λ cold dark matter cosmology. We create sky maps and identify large samples of galaxy clusters using surrogates for four different ob…