Search Publications
Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope
Aharonian, Felix; Yang, Rui-zhi; de Oña Wilhelmi, Emma
We report the results of our study of the energy spectra and absolute fluxes of cosmic rays (CRs) in the Local Galaxy based on a five-year γ-ray observation with the Fermi Large Area Telescope (LAT) of eight nearby giant molecular clouds (GMCs) belonging to the Gould Belt. The γ-ray signals obtained with high statistical significance allow the det…
The Mice at play in the CALIFA survey. A case study of a gas-rich major merger between first passage and coalescence
Marino, Raffaella A.; Johnson, Benjamin D.; Gallazzi, Anna +43 more
We present optical integral field spectroscopy (IFS) observations of the Mice, a major merger between two massive (≳1011 M⊙) gas-rich spirals NGC 4676A and B, observed between first passage and final coalescence. The spectra provide stellar and gas kinematics, ionised gas properties, and stellar population diagnostics, over t…
The wind of W Hydrae as seen by Herschel. I. The CO envelope
Waters, L. B. F. M.; Menten, K. M.; Blommaert, J. A. D. L. +25 more
Context. Asymptotic giant branch (AGB) stars lose their envelopes by means of a stellar wind whose driving mechanism is not understood well. Characterizing the composition and thermal and dynamical structure of the outflow provides constraints that are essential for understanding AGB evolution, including the rate of mass loss and isotopic ratios. …
Gas lines from the 5-Myr old optically thin disk around HD 141569A . Herschel observations and modeling
Pinte, C.; Ménard, F.; Woitke, P. +20 more
Context. The gas- and dust dissipation processes in disks around young stars remain uncertain despite numerous studies. At the distance of ~99-116 pc, HD 141569A is one of the nearest HerbigAe stars that is surrounded by a tenuous disk, probably in transition between a massive primordial disk and a debris disk. Atomic and molecular gases have been…
Long-term change in the cyclotron line energy in Hercules X-1
Harrison, F. A.; Klochkov, D.; Wilms, J. +5 more
Aims: We investigate the long-term evolution of the cyclotron resonance scattering feature (CRSF) in the spectrum of the binary X-ray pulsar
Metho…
Star formation histories, extinction, and dust properties of strongly lensed z ~ 1.5-3 star-forming galaxies from the Herschel Lensing Survey
Smail, I.; Altieri, B.; Schaerer, D. +11 more
Context. Multi-wavelength, optical to IR/submm observations of strongly lensed galaxies identified by the Herschel Lensing Survey are used to determine the physical properties of high-redshift star-forming galaxies close to or below the detection limits of blank fields.
Aims: We aim to constrain theIR stellar and dust content, and to determin…
Extending the supernova Hubble diagram to z ~ 1.5 with the Euclid space mission
Della Valle, M.; Sullivan, M.; Kessler, R. +25 more
We forecast dark energy constraints that could be obtained from a new large sample of Type Ia supernovae where those at high redshift are acquired with the Euclid space mission. We simulate a three-prong SN survey: a z < 0.35 nearby sample (8000 SNe), a 0.2 < z < 0.95 intermediate sample (8800 SNe), and a 0.75 < z < 1.55 high-z samp…
Far-infrared molecular lines from low- to high-mass star forming regions observed with Herschel
Braine, J.; Fedele, D.; Contursi, A. +13 more
Aims: Our aim is to study the response of the gas-to-energetic processes associated with high-mass star formation and compare it with previously published studies on low- and intermediate-mass young stellar objects (YSOs) using the same methods. The quantified far-IR line emission and absorption of CO, H2O, OH, and [O i] reveals th…
An edge-on translucent dust disk around the nearest AGB star, L2 Puppis. VLT/NACO spectro-imaging from 1.04 to 4.05 µm and VLTI interferometry
Kervella, P.; Chiavassa, A.; Chesneau, O. +6 more
As the nearest known AGB star (d = 64 pc) and one of the brightest (mK ≈ -2), L2 Pup is a particularly interesting benchmark object to monitor the final stages of stellar evolution. We report new serendipitous imaging observations of this star with the VLT/NACO adaptive optics system in twelve narrow-band filters covering the…
Resolving HD 100546 disc in the mid-infrared: Small inner disc and asymmetry near the gap
Jaffe, W.; Dominik, C.; Henning, Th. +5 more
Context. A region of roughly half of the solar system scale around the star HD 100546 is known to be largely cleared of gas and dust, in contrast to the outer disc that extends to about 400 AU. However, some material is observed in the immediate vicinity of the star, called the inner disc. Studying the structure of the inner and the outer disc is …