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The circumstellar disk of AB Aurigae: evidence for envelope accretion at late stages of star formation?
Guilloteau, S.; Dutrey, A.; Piétu, V. +3 more
Aims: The circumstellar disk of AB Aurigae has garnered strong attention owing to the apparent existence of spirals at a relatively young stage and also the asymmetric disk traced in thermal dust emission. However, the physical conditions of the spirals are still not well understood. The origin of the asymmetric thermal emission is unclear. <…
Shocking Tails in the Major Merger Abell 2744
Nulsen, Paul E. J.; Couch, Warrick J.; Owers, Matt S. +1 more
We identify four rare "jellyfish" galaxies in Hubble Space Telescope imagery of the major merger cluster Abell 2744. These galaxies harbor trails of star-forming knots and filaments which have formed in situ in gas tails stripped from the parent galaxies, indicating they are in the process of being transformed by the environment. Further evidence …
Spatially Resolved Hα Maps and Sizes of 57 Strongly Star-forming Galaxies at z ~ 1 from 3D-HST: Evidence for Rapid Inside-out Assembly of Disk Galaxies
Schmidt, Kasper B.; van Dokkum, Pieter G.; Franx, Marijn +13 more
We investigate the buildup of galaxies at z ~ 1 using maps of Hα and stellar continuum emission for a sample of 57 galaxies with rest-frame Hα equivalent widths >100 Å in the 3D-HST grism survey. We find that the Hα emission broadly follows the rest-frame R-band light but that it is typically somewhat more extended and clumpy. We quantify the s…
Herschel-ATLAS/GAMA: dusty early-type galaxies and passive spirals
Rodighiero, G.; Ivison, R. J.; de Zotti, G. +38 more
We present the dust properties and star formation histories of local submillimetre-selected galaxies, classified by optical morphology. Most of the galaxies are late types and very few are early types. The early-type galaxies (ETGs) that are detected contain as much dust as typical spirals, and form a unique sample that has been blindly selected a…
Precise Identifications of Submillimeter Galaxies: Measuring the History of Massive Star-forming Galaxies to z > 5
Wang, W. -H.; Owen, F. N.; Williams, J. P. +3 more
We carried out extremely sensitive Submillimeter Array (SMA) 340 GHz (860 µm) continuum imaging of a complete sample of SCUBA 850 µm sources (>4σ) with fluxes >3 mJy in the GOODS-N. Using these data and new SCUBA-2 data, we do not detect 4 of the 16 SCUBA sources, and we rule out the original SCUBA fluxes at the 4σ level. Three m…
Multi-point Shock and Flux Rope Analysis of Multiple Interplanetary Coronal Mass Ejections around 2010 August 1 in the Inner Heliosphere
Liu, Y.; Luhmann, J. G.; Webb, D. F. +20 more
We present multi-point in situ observations of a complex sequence of coronal mass ejections (CMEs) which may serve as a benchmark event for numerical and empirical space weather prediction models. On 2010 August 1, instruments on various space missions, Solar Dynamics Observatory/Solar and Heliospheric Observatory/Solar-TErrestrial-RElations-Obser…
Low-energy ions: A previously hidden solar system particle population
André, M.; Cully, C. M.
Ions with energies less than tens of eV originate from the Terrestrial ionosphere and from several planets and moons in the solar system. The low energy indicates the origin of the plasma but also severely complicates detection of the positive ions onboard sunlit spacecraft at higher altitudes, which often become positively charged to several tens…
SEDfit: Software for Spectral Energy Distribution Fitting of Photometric Data
Sawicki, Marcin
This article describes SEDfit, the earliest—but continually upgraded—software package for spectral energy distribution fitting (SED fitting) of high-redshift photometric data, and the only one to properly treat nondetections. The principles of maximum-likelihood SED fitting are described, including formulae used for fitting both detected and undet…
Uncloaking Globular Clusters in the Inner Galaxy
Minniti, Dante; Mateo, Mario; von Braun, Kaspar +4 more
Extensive photometric studies of the globular clusters located toward the center of the Milky Way have been historically neglected. The presence of patchy differential reddening in front of these clusters has proven to be a significant obstacle to their detailed study. We present here a well defined and reasonably homogeneous photometric database …
Evaporating very small grains as tracers of the UV radiation field in photo-dissociation regions
Joblin, C.; Pilleri, P.; Montillaud, J. +1 more
Context. In photo-dissociation regions (PDRs), polycyclic aromatic hydrocarbons (PAHs) may be produced by evaporation of very small grains (VSGs) by the impinging UV radiation field from a nearby star.
Aims: We quantitatively investigate the transition zone between evaporating VSGs (eVSGs) and PAHs in several PDRs.
Methods: We studied th…