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The Lyman Alpha Reference Sample. III. Properties of the Neutral ISM from GBT and VLA Observations
Verhamme, Anne; Cannon, John M.; Hayes, Matthew +16 more
We present new H I imaging and spectroscopy of the 14 UV-selected star-forming galaxies in the Lyman Alpha Reference Sample (LARS), aimed for a detailed study of the processes governing the production, propagation, and escape of Lyα photons. New H I spectroscopy, obtained with the 100 m Green Bank Telescope (GBT), robustly detects the H I spectral…
A Data-driven Approach for Retrieving Temperatures and Abundances in Brown Dwarf Atmospheres
Fortney, Jonathan J.; Line, Michael R.; Marley, Mark S. +1 more
Brown dwarf spectra contain a wealth of information about their molecular abundances, temperature structure, and gravity. We present a new data driven retrieval approach, previously used in planetary atmosphere studies, to extract the molecular abundances and temperature structure from brown dwarf spectra. The approach makes few a priori physical …
Heating of the molecular gas in the massive outflow of the local ultraluminous-infrared and radio-loud galaxy 4C12.50
Falgarone, E.; Bremer, M.; Spinoglio, L. +5 more
We present a comparison of the molecular gas properties in the outflow vs. in the ambient medium of the local prototype radio-loud and ultraluminous-infrared galaxy 4C12.50 (IRAS 13451+1232), using new data from the IRAM Plateau de Bure Interferometer and 30 m telescope and from the Herschel space telescope. Previous H2 (0-0) S(1) and S…
(25143) Itokawa: The power of radiometric techniques for the interpretation of remote thermal observations in the light of the Hayabusa rendezvous results*
Hasegawa, Sunao; Usui, Fumihiko; Müller, Thomas G.
The near-Earth asteroid (25143) Itokawa was characterized in great detail by the Japanese Hayabusa mission. We revisited the available thermal observations in the light of the true asteroid properties with the goal of evaluating the possibilities and limitations of thermal model techniques. In total, we used 25 published ground-based mid-infrared …
What is the distance to the CMB?
Clarkson, Chris; Maartens, Roy; Durrer, Ruth +1 more
The success of precision cosmology depends not only on accurate observations, but also on the theoretical model --- which must be understood to at least the same level of precision. Subtle relativistic effects can lead to biased measurements if they are neglected. One such effect gives a systematic shift in the distance-redshift relation away from…
Constraining the Atmospheric Composition of the Day-Night Terminators of HD 189733b: Atmospheric Retrieval with Aerosols
Fletcher, Leigh N.; Irwin, Patrick G. J.; Barstow, Joanna K. +2 more
A number of observations have shown that Rayleigh scattering by aerosols dominates the transmission spectrum of HD 189733b at wavelengths shortward of 1 µm. In this study, we retrieve a range of aerosol distributions consistent with transmission spectroscopy between 0.3-24 µm that were recently re-analyzed by Pont et al. To constrain t…
Evidence for dust destruction from the early-time colour change of GRB 120119A
Filippenko, Alexei V.; Cenko, S. Bradley; Li, Weidong +16 more
We present broad-band observations and analysis of Swift gamma-ray burst (GRB) 120119A. Our early-time afterglow detections began under 15 s after the burst in the host frame (redshift z = 1.73), and they yield constraints on the burst energetics and local environment. Late-time afterglow observations of the burst show evidence for a moderate colu…
The initial Gaia source list
Smart, R. L.; Nicastro, L.
Aims: We describe the production of the Initial Gaia Source List (IGSL) used both as the starting point for observation-matching in the Gaia data processing and as a comparison catalog to trigger early science alerts.
Methods: The IGSL was compiled from large scale public catalogs and a few specific catalogs provided by the Gaia Consorti…
A measurement of the millimetre emission and the Sunyaev-Zel'dovich effect associated with low-frequency radio sources
Ivison, R. J.; Hilton, Matt; Sifón, Cristóbal +38 more
We present a statistical analysis of the millimetre-wavelength properties of 1.4 GHz-selected sources and a detection of the Sunyaev-Zel'dovich (SZ) effect associated with the haloes that host them. We stack data at 148, 218 and 277 GHz from the Atacama Cosmology Telescope at the positions of a large sample of radio AGN selected at 1.4 GHz. The th…
Thermal infrared observations of asteroid (99942) Apophis with Herschel
Altieri, B.; Müller, T. G.; Kiss, C. +4 more
The near-Earth asteroid (99942) Apophis is a potentially hazardous asteroid. We obtained far-infrared observations of this asteroid with the Herschel Space Observatory PACS instrument at 70, 100, and 160 µm. These were taken at two epochs in January and March 2013 during a close-Earth encounter. These first thermal measurements of Apophis we…