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An ALMA Early Science survey of molecular absorption lines toward PKS 1830-211. Analysis of the absorption profiles
Menten, K. M.; Combes, F.; Horellou, C. +17 more
We present the first results of an ALMA spectral survey of strong absorption lines for common interstellar species in the z = 0.89 molecular absorber toward the lensed blazar PKS 1830-211. The dataset brings essential information on the structure and composition of the absorbing gas in the foreground galaxy. In particular, we find absorption over …
Influence of physical galaxy properties on Lyα escape in star-forming galaxies
Hayes, Matthew; Schaerer, Daniel; Östlin, Göran +4 more
Context. Among the different observational techniques used to select high-redshift galaxies, the hydrogen recombination line Lyman-alpha (Lyα) is of particular interest because it gives access to the measurement of cosmological quantities such as the star formation rate (SFR) of distant galaxy populations. However, interpreting this line and calib…
Neutral interstellar He parameters in front of the heliosphere 1994-2007
Bzowski, M.; Witte, M.; Banaszkiewicz, M. +3 more
Context. A recent analysis of IBEX measurements of the neutral interstellar He flux showed that the inflow velocity vector is different from the results of an earlier analysis of observations from the GAS instrument onboard Ulysses. A recently published compilation of published results on the helium inflow direction from the past ~40 years suggest…
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays
Maraschi, L.; Covino, S.; Antonelli, L. A. +156 more
Aims: The radio galaxy
Methods…
The VLT-FLAMES Tarantula Survey. XIII: On the nature of O Vz stars in 30 Doradus
Herrero, A.; Simón-Díaz, S.; Puls, J. +13 more
Context. O Vz stars, a subclass of O-type dwarfs characterized by having He ii λ4686 stronger in absorption than any other helium line in their blue-violet spectra, have been suggested to be on or near the zero-age main sequence (ZAMS). If their youth were confirmed, they would be key objects with which to advance our knowledge of the physical pro…
Accelerated post-AGB evolution, initial-final mass relations, and the star-formation history of the Galactic bulge
Zijlstra, A. A.; Hajduk, M.; Gesicki, K. +1 more
Aims: We study the star-formation history of the Galactic bulge, as derived from the age distribution of the central stars of planetary nebulae that belong to this stellar population.
Methods: The high resolution imaging and spectroscopic observations of 31 compact planetary nebulae are used to derive their central star masses. We use th…
The Herschel Exploitation of Local Galaxy Andromeda (HELGA). IV. Dust scaling relations at sub-kpc resolution
Blommaert, J. A. D. L.; Ciesla, L.; Boquien, M. +18 more
Context. Dust and stars play a complex game of interactions in the interstellar medium and around young stars. The imprints of these processes are visible in scaling relations between stellar characteristics, star formation parameters, and dust properties.
Aims: In the present work, we aim to examine dust scaling relations on a sub-kpc resolu…
Planck intermediate results. XIV. Dust emission at millimetre wavelengths in the Galactic plane
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +192 more
We use Planck HFI data combined with ancillary radio data to study the emissivity index of the interstellar dust emission in the frequency range 100-353 GHz, or 3-0.8 mm, in the Galactic plane. We analyse the region l = 20°-44° and |b| ≤ 4° where the free-free emission can be estimated from radio recombination line data. We fit the spectra at each…
CLASH-VLT: The stellar mass function and stellar mass density profile of the z = 0.44 cluster of galaxies MACS J1206.2-0847
Demarco, R.; Infante, L.; Grillo, C. +29 more
Context. The study of the galaxy stellar mass function (SMF) in relation to the galaxy environment and the stellar mass density profile, ρ⋆(r), is a powerful tool to constrain models of galaxy evolution.
Aims: We determine the SMF of the z = 0.44 cluster of galaxies MACS J1206.2-0847 separately for passive and star-forming (SF) gal…
On the formation of Mg ii h and k lines in solar prominences
Heinzel, P.; Vial, J. -C.; Anzer, U.
Aims: With the recent launch of the IRIS mission, it has become urgent to develop the spectral diagnostics using the Mg ii resonance h and k lines. In this paper, we aim to demonstrate the behavior of these lines under various prominence conditions. Our results serve as a basis for analysis of new IRIS data and for more sophisticated prominen…