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Legacy Extragalactic UV Survey (LEGUS) With the Hubble Space Telescope. I. Survey Description
Schaerer, D.; Östlin, G.; Herrero, A. +45 more
The Legacy ExtraGalactic UV Survey (LEGUS) is a Cycle 21 Treasury program on the Hubble Space Telescope aimed at the investigation of star formation and its relation with galactic environment in nearby galaxies, from the scales of individual stars to those of ∼kiloparsec-size clustered structures. Five-band imaging from the near-ultraviolet to the…
Blowin' in the Wind: Both "Negative" and "Positive" Feedback in an Obscured High-z Quasar
Maiolino, R.; Silverman, J. D.; Merloni, A. +13 more
Quasar feedback in the form of powerful outflows is invoked as a key mechanism to quench star formation in galaxies, preventing massive galaxies to overgrow and producing the red colors of ellipticals. On the other hand, some models are also requiring "positive" active galactic nucleus feedback, inducing star formation in the host galaxy through e…
[C II] 158 µm Emission as a Star Formation Tracer
Helou, G.; Boquien, M.; Roussel, H. +23 more
The [C II] 157.74 µm transition is the dominant coolant of the neutral interstellar gas, and has great potential as a star formation rate (SFR) tracer. Using the Herschel KINGFISH sample of 46 nearby galaxies, we investigate the relation of [C II] surface brightness and luminosity with SFR. We conclude that [C II] can be used for measurement…
Substorm Current Wedge Revisited
Lester, M.; Nakamura, R.; McPherron, R. L. +7 more
Almost 40 years ago the concept of the substorm current wedge was developed to explain the magnetic signatures observed on the ground and in geosynchronous orbit during substorm expansion. In the ensuing decades new observations, including radar and low-altitude spacecraft, MHD simulations, and theoretical considerations have tremendously advanced…
Tau-REx I: A Next Generation Retrieval Code for Exoplanetary Atmospheres
Waldmann, I. P.; Rocchetto, M.; Tinetti, G. +3 more
Spectroscopy of exoplanetary atmospheres has become a well established method for the characterization of extrasolar planets. We here present a novel inverse retrieval code for exoplanetary atmospheres. T-REx(Tau Retrieval for Exoplanets) is a line-by-line radiative transfer fully Bayesian retrieval framework. T-REx includes the following features…
Evolution of Active Regions
van Driel-Gesztelyi, Lidia; Green, Lucie May
The evolution of active regions (AR) from their emergence through their long decay process is of fundamental importance in solar physics. Since large-scale flux is generated by the deep-seated dynamo, the observed characteristics of flux emergence and that of the subsequent decay provide vital clues as well as boundary conditions for dynamo models…
The MUSE 3D view of the Hubble Deep Field South
Dreizler, S.; Steinmetz, M.; Carollo, C. M. +35 more
We observed Hubble Deep Field South with the new panoramic integral-field spectrograph MUSE that we built and have just commissioned at the VLT. The data cube resulting from 27 h of integration covers one arcmin2 field of view at an unprecedented depth with a 1σ emission-line surface brightness limit of 1 × 10-19 erg s-1…
Shape model, reference system definition, and cartographic mapping standards for comet 67P/Churyumov-Gerasimenko - Stereo-photogrammetric analysis of Rosetta/OSIRIS image data
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +42 more
We analyzed more than 200 OSIRIS NAC images with a pixel scale of 0.9-2.4 m/pixel of comet 67P/Churyumov-Gerasimenko (67P) that have been acquired from onboard the Rosetta spacecraft in August and September 2014 using stereo-photogrammetric methods (SPG). We derived improved spacecraft position and pointing data for the OSIRIS images and a high-re…
Checking the Dark Matter Origin of a 3.53 keV Line with the Milky Way Center
Boyarsky, A.; Franse, J.; Iakubovskyi, D. +1 more
We detect a line at 3.539 ±0.011 keV in the deep exposure data set of the Galactic center region, observed with the x-ray multi-mirror mission Newton. The dark matter interpretation of the signal observed in the Perseus galaxy cluster, the Andromeda galaxy [A. Boyarsky et al., Phys. Rev. Lett. 113, 251301 (2014)], and in the stacked spectra of gal…
Insolation, erosion, and morphology of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
Context. The complex shape of comet 67P and its oblique rotation axis cause pronounced seasonal effects. Irradiation and hence activity vary strongly.
Aims: We investigate the insolation of the cometary surface in order to predict the sublimation of water ice. The strongly varying erosion levels are correlated with the topography and morpholo…