Search Publications
Modelling clumpy photon-dominated regions in 3D. Understanding the Orion Bar stratification
Röllig, M.; Ossenkopf-Okada, V.; Andree-Labsch, S.
Context. Models of photon-dominated regions (PDRs) still fail to fully reproduce some of the observed properties. In particular they do not reproduce the combination of the intensities of different PDR cooling lines together with the chemical stratification, as observed for example for the Orion Bar PDR.
Aims: We aim to construct a numerical …
True polar wander of Enceladus from topographic data
Hedman, Matthew M.; Schenk, Paul M.; Burns, Joseph A. +4 more
Many objects in the solar system are suspected to have experienced reorientation of their spin axes. As their rotation rates are slow and their shapes are nearly spherical, the formation of mass anomalies, by either endogenic or exogenic processes, can change objects' moments of inertia. Therefore, the objects reorient to align their largest momen…
Spatially Resolved Kinematics in the Central 1 kpc of a Compact Star-forming Galaxy at z ∼2.3 from ALMA CO Observations
Rujopakarn, W.; Faber, S. M.; Dekel, A. +9 more
We present high spatial resolution (FWHM ∼ 0.″14) observations of the CO(8-7) line in GDS-14876, a compact star-forming galaxy at z = 2.3 with a total stellar mass of log(M ⋆/M ⊙) = 10.9. The spatially resolved velocity map of the inner r ≲ 1 kpc reveals a continuous velocity gradient consistent with the kinematics of a rotat…
FIGS—Faint Infrared Grism Survey: Description and Data Reduction
Finkelstein, Steven L.; Hathi, Nimish P.; Koekemoer, Anton M. +26 more
The Faint Infrared Grism Survey (FIGS) is a deep Hubble Space Telescope (HST) WFC3/IR (Wide Field Camera 3 Infrared) slitless spectroscopic survey of four deep fields. Two fields are located in the Great Observatories Origins Deep Survey-North (GOODS-N) area and two fields are located in the Great Observatories Origins Deep Survey-South (GOODS-S) …
Cosmological parameters from pre-Planck CMB measurements: A 2017 update
Bond, J. Richard; Devlin, Mark J.; Dunkley, Joanna +15 more
We present cosmological constraints from the combination of the full mission nine-year WMAP release and small-scale temperature data from the pre-Planck Atacama Cosmology Telescope (ACT) and South Pole Telescope (SPT) generation of instruments. This is an update of the analysis presented in Calabrese et al. [Phys. Rev. D 87, 103012 (2013), 10.1103…
Imprint of DES superstructures on the cosmic microwave background
Benoit-Lévy, A.; Bacon, D.; D'Andrea, C. B. +61 more
Small temperature anisotropies in the cosmic microwave background (CMB) can be sourced by density perturbations via the late-time integrated Sachs-Wolfe (ISW) effect. Large voids and superclusters are excellent environments to make a localized measurement of this tiny imprint. In some cases excess signals have been reported. We probed these claims…
A new observational solar irradiance composite
Schmutz, Werner; Haberreiter, Margit; Schöll, Micha +4 more
Variations in the solar spectral irradiance (SSI) are an important driver of the chemistry, temperature, and dynamics of the Earth's atmosphere and ultimately the Earth's climate. To investigate the detailed response of the Earth's atmosphere to SSI variations, a reliable SSI data set is needed. We present an observational SSI composite data set t…
ALMA Observations of Starless Core Substructure in Ophiuchus
Di Francesco, J.; Sadavoy, S. I.; Johnstone, D. +11 more
Compact substructure is expected to arise in a starless core as mass becomes concentrated in the central region likely to form a protostar. Additionally, multiple peaks may form if fragmentation occurs. We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 2 observations of 60 starless and protostellar cores in the Ophiuchus molecul…
Space Motions of the Dwarf Spheroidal Galaxies Draco and Sculptor Based on HST Proper Motions with a ∼10 yr Time Baseline
van der Marel, Roeland P.; van de Ven, Glenn; Bellini, Andrea +6 more
We present new proper motion (PM) measurements of the dwarf spheroidal galaxies (dSphs) Draco and Sculptor using multiepoch images obtained with the Hubble Space Telescope ACS/WFC. Our PM results have uncertainties far lower than previous measurements, even those made with the same instrument. The PM results for Draco and Sculptor are ({µ }<…
The late-time light curve of the Type Ia supernova SN 2011fe
Gal-Yam, A.; Sullivan, M.; Nugent, P. +10 more
We present late-time optical R-band imaging data from the Palomar Transient Factory (PTF) for the nearby Type Ia supernova SN 2011fe. The stacked PTF light curve provides densely sampled coverage down to R ≃ 22 mag over 200-620 d past explosion. Combining with literature data, we estimate the pseudo-bolometric light curve for this event from 200 t…