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Size evolution of star-forming galaxies with 2 <z < 4.5 in the VIMOS Ultra-Deep Survey
Maccagni, D.; Giavalisco, M.; Fontana, A. +15 more
Context. The size of a galaxy encapsulates the signature of the different physical processes driving its evolution. The distribution of galaxy sizes in the Universe as a function of cosmic time is therefore a key to understand galaxy evolution.
Aims: We aim to measure the average sizes and size distributions of galaxies as they are assembling…
Disappearance of the Progenitor of Supernova iPTF13bvn
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Foley, Ryan J. +13 more
Supernova (SN) iPTF13bvn in NGC 5806 was the first Type Ib SN to have been tentatively associated with a progenitor in pre-explosion images. We performed deep ultraviolet (UV) and optical Hubble Space Telescope observations of the SN site ∼740 days after explosion. We detect an object in the optical bands that is fainter than the pre-explosion obj…
A primordial origin for molecular oxygen in comets: a chemical kinetics study of the formation and survival of O2 ice from clouds to discs
van Dishoeck, E. F.; Walsh, C.; Taquet, V. +1 more
Molecular oxygen has been confirmed as the fourth most abundant molecule in cometary material (O2/H2O ∼ 4 per cent) and is thought to have a primordial nature, I.e. coming from the interstellar cloud from which our Solar system was formed. However, interstellar O2 gas is notoriously difficult to detect and has only…
The evolved-star dust budget of the Small Magellanic Cloud: the critical role of a few key players
Boyer, M. L.; Meixner, M.; Kemper, F. +3 more
The life cycle of dust in the interstellar medium is heavily influenced by outflows from asymptotic giant branch (AGB) and red supergiant (RSG) stars, a large fraction of which is contributed by a few very dusty sources. We compute the dust input to the Small Magellanic Cloud (SMC) by fitting the multi-epoch mid-infrared spectral energy distributi…
Dissecting galaxies: spatial and spectral separation of emission excited by star formation and AGN activity
Kewley, Lisa J.; Juneau, Stéphanie; Davies, Rebecca L. +13 more
The optical spectra of Seyfert galaxies are often dominated by emission lines excited by both star formation and active galactic nucleus (AGN) activity. Standard calibrations (such as for the star formation rate) are not applicable to such composite (mixed) spectra. In this paper, we describe how integral field data can be used to spectrally and s…
A first assessment of the strength of cometary particles collected in-situ by the COSIMA instrument onboard ROSETTA
Langevin, Yves; Della Corte, Vincenzo; Hornung, Klaus +9 more
Soon after the arrival of the ROSETTA spacecraft at Comet 67/P Churyumov-Gerasimenko the onboard instrument COSIMA ("Cometary Secondary Ion Mass Analyzer") collected a large number of cometary dust particles on targets from gold black of thickness between 10 and 30 µm. Inspection by its camera subsystem revealed that many of them consist of …
An observational study of dust nucleation in Mira (o Ceti). I. Variable features of AlO and other Al-bearing species
Menten, K. M.; Müller, H. S. P.; Patel, N. A. +8 more
Context. Dust is efficiently produced by cool giant stars, but the condensation of inorganic dust is poorly understood. Observations of key aluminum bearing molecules around evolved stars has enabled us to investigate the nucleation of alumina (Al2O3) dust in the gas.
Aims: We aim to identify and characterize aluminum be…
A hard X-ray view of the soft excess in AGN
Ricci, Claudio; Paltani, Stéphane; Boissay, Rozenn
An excess of X-ray emission below 1 keV, called soft excess, is detected in a large fraction of Seyfert 1-1.5s. The origin of this feature remains debated, as several models have been suggested to explain it, including warm Comptonization and blurred ionized reflection. In order to constrain the origin of this component, we exploit the different b…
Spectral analysis of the XMM-Newton data of GX 339-4 in the low/hard state: disc truncation and reflection
Zdziarski, Andrzej A.; Basak, Rupal
We analyse all available observations of GX 339-4 by XMM-Newton in the hard spectral state. We jointly fit the spectral data by Comptonization and the currently best reflection code, relxill. We consider in detail a contribution from a standard blackbody accretion disc, testing whether its inner radius can be set equal to that of the reflector. Ho…
Globules and pillars in Cygnus X. I. Herschel far-infrared imaging of the Cygnus OB2 environment
Hill, T.; White, G. J.; André, Ph. +21 more
The radiative feedback of massive stars on molecular clouds creates pillars, globules and other features at the interface between the H II region and molecular cloud. Optical and near-infrared observations from the ground as well as with the Hubble or Spitzer satellites have revealed numerous examples of such cloud structures. We present here Hers…