Search Publications
Persistent Doppler Shift Oscillations Observed with Hinode/EIS in the Solar Corona: Spectroscopic Signatures of Alfvénic Waves and Recurring Upflows
De Pontieu, Bart; McIntosh, Scott W.; Tian, Hui +4 more
Using data obtained by the EUV Imaging Spectrometer on board Hinode, we have performed a survey of obvious and persistent (without significant damping) Doppler shift oscillations in the corona. We have found mainly two types of oscillations from February to April in 2007. One type is found at loop footpoint regions, with a dominant period around 1…
The Brightest of Reionizing Galaxies Survey: Constraints on the Bright End of the z ~ 8 Luminosity Function
Shull, J. M.; Treu, T.; Trenti, M. +6 more
We report the discovery of 33 Lyman-break galaxy candidates at z ~ 8 detected in Hubble Space Telescope Wide Field Camera 3 (WFC3) imaging as part of the Brightest of Reionizing Galaxies (BoRG) pure-parallel survey. The ongoing BoRG survey currently has the largest area (274 arcmin2) with Y 098 (or Y 105), J 1…
GOODS-Herschel: Impact of Active Galactic Nuclei and Star Formation Activity on Infrared Spectral Energy Distributions at High Redshift
Dickinson, Mark; Kirkpatrick, Allison; Valtchanov, Ivan +25 more
We explore the effects of active galactic nuclei (AGNs) and star formation activity on the infrared (0.3-1000 µm) spectral energy distributions (SEDs) of luminous infrared galaxies from z = 0.5 to 4.0. We have compiled a large sample of 151 galaxies selected at 24 µm (S 24 >~ 100 µJy) in the GOODS-N and ECDFS fields…
Evidence for Dark Matter Contraction and a Salpeter Initial Mass Function in a Massive Early-type Galaxy
Treu, T.; Auger, M. W.; Gavazzi, R. +5 more
Stars and dark matter account for most of the mass of early-type galaxies, but uncertainties in the stellar population and the dark matter profile make it challenging to distinguish between the two components. Nevertheless, precise observations of stellar and dark matter are extremely valuable for testing the many models of structure formation and…
G0.253 + 0.016: A Molecular Cloud Progenitor of an Arches-like Cluster
Longmore, Steven N.; Battersby, Cara; Meingast, Stefan +20 more
Young massive clusters (YMCs) with stellar masses of 104-105 M ⊙ and core stellar densities of 104-105 stars per cubic pc are thought to be the "missing link" between open clusters and extreme extragalactic super star clusters and globular clusters. As such, studying the initial conditions of …
A Redshift Survey of Herschel Far-infrared Selected Starbursts and Implications for Obscured Star Formation
Berta, S.; Magnelli, B.; Lutz, D. +30 more
We present Keck spectroscopic observations and redshifts for a sample of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and 500 µm, taken with the Keck I Low Resolution Imaging Spectrometer and the Keck II DEep Imaging Multi-Object Spectrograph. The redshift distribution of these SPIRE sources from the Herschel Multitiered Extragal…
Multi-wavelength View of Kiloparsec-scale Clumps in Star-forming Galaxies at z ~ 2
Ferguson, Henry C.; Giavalisco, Mauro; Koekemoer, Anton M. +2 more
This paper studies the properties of kiloparsec-scale clumps in star-forming galaxies at z ~ 2 through multi-wavelength broadband photometry. A sample of 40 clumps is identified from Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) z-band images through auto-detection and visual inspection from 10 galaxies with 1.5 < z < 2.5 in…
The Deflection of the Two Interacting Coronal Mass Ejections of 2010 May 23-24 as Revealed by Combined in Situ Measurements and Heliospheric Imaging
Möstl, C.; Farrugia, C. J.; Temmer, M. +4 more
In 2010 May 23-24, Solar Dynamics Observatory (SDO) observed the launch of two successive coronal mass ejections (CMEs), which were subsequently tracked by the SECCHI suite on board STEREO. Using the COR2 coronagraphs and the heliospheric imagers (HIs), the initial direction of both CMEs is determined to be slightly west of the Sun-Earth line. We …
Bipolar Magnetic Regions on the Sun: Global Analysis of the SOHO/MDI Data Set
Kosovichev, A. G.; Stenflo, J. O.
The magnetic flux that is generated by dynamo processes inside the Sun emerges in the form of bipolar magnetic regions. The properties of these directly observable signatures of the dynamo can be extracted from full-disk solar magnetograms. The most homogeneous, high-quality synoptic data set of solar magnetograms has been obtained with the Michel…
First Detection of Water Vapor in a Pre-stellar Core
Caselli, Paola; Codella, Claudio; Aikawa, Yuri +11 more
Water is a crucial molecule in molecular astrophysics as it controls much of the gas/grain chemistry, including the formation and evolution of more complex organic molecules in ices. Pre-stellar cores provide the original reservoir of material from which future planetary systems are built, but few observational constraints exist on the formation o…