Search Publications
Reheating predictions in single field inflation
Krauss, Lawrence M.; Easson, Damien A.; Cook, Jessica L. +1 more
Reheating is a transition era after the end of inflation, during which the inflaton is converted into the particles that populate the Universe at later times. No direct cosmological observables are normally traceable to this period of reheating. Indirect bounds can however be derived. One possibility is to consider cosmological evolution for obser…
Organic compounds on comet 67P/Churyumov-Gerasimenko revealed by COSAC mass spectrometry
Krüger, Harald; McKenna-Lawlor, Susan; Gautier, Thomas +18 more
Comets harbor the most pristine material in our solar system in the form of ice, dust, silicates, and refractory organic material with some interstellar heritage. The evolved gas analyzer Cometary Sampling and Composition (COSAC) experiment aboard Rosetta’s Philae lander was designed for in situ analysis of organic molecules on comet 67P/Churyumov…
Weather on Other Worlds. II. Survey Results: Spots are Ubiquitous on L and T Dwarfs
Goldman, Bertrand; Apai, Dániel; Marley, Mark S. +7 more
We present results from the Weather on Other Worlds Spitzer Exploration Science program to investigate photometric variability in L and T dwarfs, usually attributed to patchy clouds. We surveyed 44 L3-T8 dwarfs, spanning a range of J - Ks colors and surface gravities. We find that 14/23 (61%-20%+17%, 95% confidence…
Black hole feedback in the luminous quasar PDS 456
Harrison, F. A.; Stern, D.; Behar, E. +17 more
The evolution of galaxies is connected to the growth of supermassive black holes in their centers. During the quasar phase, a huge luminosity is released as matter falls onto the black hole, and radiation-driven winds can transfer most of this energy back to the host galaxy. Over five different epochs, we detected the signatures of a nearly spheri…
Scaling properties of a complete X-ray selected galaxy group sample
Lovisari, L.; Reiprich, T. H.; Schellenberger, G.
Context. Upcoming X-ray surveys like eROSITA require precise calibration between X-ray observables and mass down to the low-mass regime to set tight constraints on the fundamental cosmological parameters. Since an individual mass measurement is only possible for relatively few objects, it is crucial to have reliable and clearly understood scaling …
A Turnover in the Galaxy Main Sequence of Star Formation at M * ~ 1010 M ⊙ for Redshifts z < 1.3
Casey, Caitlin M.; Kartaltepe, Jeyhan S.; Kewley, Lisa J. +14 more
The relationship between galaxy star formation rates (SFRs) and stellar masses (M *) is reexamined using a mass-selected sample of ~62,000 star-forming galaxies at z <= 1.3 in the COSMOS 2 deg2 field. Using new far-infrared photometry from Herschel-PACS and SPIRE and Spitzer-MIPS 24 µm, along with derived infrared lu…
LoCuSS: The Slow Quenching of Star Formation in Cluster Galaxies and the Need for Pre-processing
Finoguenov, A.; Smith, G. P.; Okabe, N. +8 more
We present a study of the spatial distribution and kinematics of star-forming galaxies in 30 massive clusters at 0.15 < z < 0.30, combining wide-field Spitzer 24 µm and GALEX near-ultraviolet imaging with highly complete spectroscopy of cluster members. The fraction (fSF) of star-forming cluster galaxies rises steadily with …
A Measurement of Secondary Cosmic Microwave Background Anisotropies from the 2500 Square-degree SPT-SZ Survey
Bleem, L. E.; Stark, A. A.; George, E. M. +45 more
We present measurements of secondary cosmic microwave background (CMB) anisotropies and cosmic infrared background (CIB) fluctuations using data from the South Pole Telescope (SPT) covering the complete 2540 deg2 SPT-SZ survey area. Data in the three SPT-SZ frequency bands centered at 95, 150, and 220 GHz, are used to produce six angula…
The formation of massive, compact galaxies at z = 2 in the Illustris simulation
van Dokkum, Pieter; Kriek, Mariska; Wellons, Sarah +13 more
Massive, quiescent galaxies at high redshift have been found to be considerably more compact than galaxies of similar mass in the local universe. How these compact galaxies formed has yet to be determined, though several progenitor populations have been proposed. Here we investigate the formation processes and quantify the assembly histories of su…
Herschel Survey of Galactic OH+, H2O+, and H3O+: Probing the Molecular Hydrogen Fraction and Cosmic-Ray Ionization Rate
Menten, K. M.; Falgarone, E.; Godard, B. +19 more
In diffuse interstellar clouds the chemistry that leads to the formation of the oxygen-bearing ions OH+, H2O+, and H3O+ begins with the ionization of atomic hydrogen by cosmic rays, and continues through subsequent hydrogen abstraction reactions involving H2. Given these reaction pa…