Search Publications
Solar Wind Interaction and Impact on the Venus Atmosphere
Barabash, Stas; Stenberg Wieser, Gabriella; Futaana, Yoshifumi +1 more
Venus has intrigued planetary scientists for decades because of its huge contrasts to Earth, in spite of its nickname of "Earth's Twin". Its invisible upper atmosphere and space environment are also part of the larger story of Venus and its evolution. In 60s to 70s, several missions (Venera and Mariner series) explored Venus-solar wind interaction…
Coupling hydrodynamics with comoving frame radiative transfer. I. A unified approach for OB and WR stars
Hamann, W. -R.; Sander, A. A. C.; Shenar, T. +2 more
Context. For more than two decades, stellar atmosphere codes have been used to derive the stellar and wind parameters of massive stars. Although they have become a powerful tool and sufficiently reproduce the observed spectral appearance, they can hardly be used for more than measuring parameters. One major obstacle is their inconsistency between …
The Chandra COSMOS Legacy Survey: Energy Spectrum of the Cosmic X-Ray Background and Constraints on Undetected Populations
Treister, E.; Comastri, Andrea; Elvis, Martin +15 more
Using Chandra observations in the 2.15 deg2 COSMOS-legacy field, we present one of the most accurate measurements of the Cosmic X-ray Background (CXB) spectrum to date in the [0.3-7] keV energy band. The CXB has three distinct components: contributions from two Galactic collisional thermal plasmas at kT ∼ 0.27 and 0.07 keV and an extrag…
High Lyman Continuum Escape Fraction in a Lensed Young Compact Dwarf Galaxy at z = 2.5
Fan, Xiaohui; Jiang, Linhua; Cai, Zheng +2 more
We present the HST WFC3/F275W UV imaging observations of A2218-Flanking, a lensed compact dwarf galaxy at redshift z≈ 2.5. The stellar mass of A2218-Flanking is {log}({M}* /{M}⊙ )={9.14}-0.04+0.07 and SFR is {12.5}-7.4+3.8 {M}⊙ yr-1 after correcting the magnif…
Lensing substructure quantification in RXJ1131-1231: a 2 keV lower bound on dark matter thermal relic mass
Amara, Adam; Refregier, Alexandre; Birrer, Simon
We study the substructure content of the strong gravitational lens RXJ1131-1231 through a forward modelling approach that relies on generating an extensive suite of realistic simulations. We use a semi-analytic merger tree prescription that allows us to stochastically generate substructure populations whose properties depend on the dark matter par…
A representative survey of the dynamics and energetics of FR II radio galaxies
Hardcastle, M. J.; Croston, J. H.; Ineson, J. +1 more
We report the first large, systematic study of the dynamics and energetics of a representative sample of Fanaroff-Riley type II (FR II) radio galaxies with well-characterized group/cluster environments. We used X-ray inverse-Compton and radio synchrotron measurements to determine the internal radio-lobe conditions, and these were compared with ext…
The Origins of [C II] Emission in Local Star-forming Galaxies
Boquien, M.; Rigopoulou, D.; Armus, L. +17 more
The [C II] 158 µm fine-structure line is the brightest emission line observed in local star-forming galaxies. As a major coolant of the gas-phase interstellar medium, [C II] balances the heating, including that due to far-ultraviolet photons, which heat the gas via the photoelectric effect. However, the origin of [C II] emission remains uncl…
A Herschel Space Observatory Spectral Line Survey of Local Luminous Infrared Galaxies from 194 to 671 Microns
Gao, Yu; Díaz-Santos, Tanio; Lu, Nanyao +18 more
We describe a Herschel Space Observatory 194-671 µm spectroscopic survey of a sample of 121 local luminous infrared galaxies and report the fluxes of the CO J to J-1 rotational transitions for 4≤slant J≤slant 13, the [N II] 205 µm line, the [C I] lines at 609 and 370 µm, as well as additional and usually fainter lines. The CO spe…
The Complete Infrared View of Active Galactic Nuclei from the 70 Month Swift/BAT Catalog
Ueda, Yoshihiro; Kawamuro, Taiki; Ricci, Claudio +5 more
We systematically investigate the near- to far-infrared (FIR) photometric properties of a nearly complete sample of local active galactic nuclei (AGNs) detected in the Swift/Burst Alert Telescope (BAT) all-sky ultra-hard X-ray (14-195 keV) survey. Out of 606 non-blazar AGNs in the Swift/BAT 70 month catalog at high galactic latitudes of | b| > …
ATLASGAL-selected massive clumps in the inner Galaxy. III. Dust continuum characterization of an evolutionary sample
König, C.; Menten, K. M.; Csengeri, T. +8 more
Context. Massive-star formation and the processes involved are still poorly understood. The ATLASGAL survey provides an ideal basis for detailed studies of large numbers of massive-star forming clumps covering the whole range of evolutionary stages. The ATLASGAL Top100 is a sample of clumps selected by their infrared and radio properties to be rep…