Search Publications
Star Formation in the Milky Way and Nearby Galaxies
Kennicutt, Robert C.; Evans, Neal J.
We review progress over the past decade in observations of large-scale star formation, with a focus on the interface between extragalactic and Galactic studies. Methods of measuring gas contents and star-formation rates are discussed, and updated prescriptions for calculating star-formation rates are provided. We review relations between star form…
The Hubble Space Telescope Cluster Supernova Survey. V. Improving the Dark-energy Constraints above z > 1 and Building an Early-type-hosted Supernova Sample
Gladders, M. D.; Panagia, N.; Stern, D. +63 more
We present Advanced Camera for Surveys, NICMOS, and Keck adaptive-optics-assisted photometry of 20 Type Ia supernovae (SNe Ia) from the Hubble Space Telescope (HST) Cluster Supernova Survey. The SNe Ia were discovered over the redshift interval 0.623 < z < 1.415. Of these SNe Ia, 14 pass our strict selection cuts and are used in combination …
The Cluster Lensing and Supernova Survey with Hubble: An Overview
Donahue, Megan; Broadhurst, Tom; Moustakas, John +42 more
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit Multi-Cycle Treasury Program to use the gravitational lensing properties of 25 galaxy clusters to accurately constrain their mass distributions. The survey, described in detail in this paper, will definitively establish the degree of concentration of dark matter in the clu…
Mid-infrared Selection of Active Galactic Nuclei with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-selected Active Galactic Nuclei in COSMOS
Tsai, Chao-Wei; Dey, Arjun; Griffith, Roger L. +15 more
The Wide-field Infrared Survey Explorer (WISE) is an extremely capable and efficient black hole finder. We present a simple mid-infrared color criterion, W1 - W2 >= 0.8 (i.e., [3.4]-[4.6] >=0.8, Vega), which identifies 61.9 ± 5.4 active galactic nucleus (AGN) candidates per deg2 to a depth of W2 ~ 15.0. This implies a much larger …
UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
Sutherland, W.; Milvang-Jensen, B.; Fynbo, J. P. U. +18 more
In this paper we describe the first data release of the UltraVISTA near-infrared imaging survey of the COSMOS field. We summarise the key goals and design of the survey and provide a detailed description of our data reduction techniques. We provide stacked, sky-subtracted images in YJHKs and narrow-band filters constructed from data col…
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…