Search Publications
Spectroscopic observations of ices around embedded young stellar objects in the Large Magellanic Cloud with AKARI
Onaka, T.; Sakon, I.; Kaneda, H. +4 more
Aims: The aim of this study is to understand the chemical conditions of ices around embedded young stellar objects (YSOs) in the metal-poor Large Magellanic Cloud (LMC).
Methods: We performed near-infrared (2.5-5 µm) spectroscopic observations toward 12 massive embedded YSOs and their candidates in the LMC using the infrared camera…
Is there a highly magnetized neutron star in GX 301-2?
Klochkov, D.; Santangelo, A.; Ferrigno, C. +4 more
We present the results of an in-depth study of the long-period X-ray pulsar GX 301-2. Using archival data of INTEGRAL, RXTE ASM, and CGRO BATSE, we study the spectral and timing properties of the source. Comparison of our timing results with previously published work reveals a secular decay of the orbital period at a rate of ≃ - 3.25 × 10-5
Galactic cold cores: Herschel study of first Planck detections
Bernard, J. -P.; Giard, M.; Juvela, M. +25 more
Context. We present the first results from the project Galactic cold cores, where the cold interstellar clouds detected by the Planck satellite are studied with Herschel photometric observations. The final Planck catalogue is expected to contain several thousand sources. The Herschel observations during the science demonstration phase provided the…
Dissecting the Moth: discovery of an off-centered ring in the HD 61005 debris disk with high-resolution imaging
Ménard, F.; Quanz, S. P.; Henning, T. +17 more
The debris disk known as “The Moth” is named after its unusually asymmetric surface brightness distribution. It is located around the ~90 Myr old G8V star HD 61005 at 34.5 pc and has previously been imaged by the HST at 1.1 and 0.6 µm. Polarimetric observations suggested that the circumstellar material consists of two distinct components, a …
The HerMES SPIRE submillimeter local luminosity function
Altieri, B.; Aussel, H.; Elbaz, D. +77 more
Local luminosity functions are fundamental benchmarks for high-redshift galaxy formation and evolution studies as well as for models describing these processes. Determining the local luminosity function in the submillimeter range can help to better constrain in particular the bolometric luminosity density in the local Universe, and Herschel offers…
Radiolysis of H2O:CO2 ices by heavy energetic cosmic ray analogs
Pilling, S.; Seperuelo Duarte, E.; da Silveira, E. F. +3 more
An experimental study of the interaction of heavy, highly charged, and energetic ions (52 MeV 58Ni13+) with pure H2O, pure CO2 and mixed H2O:CO2 astrophysical ice analogs is presented. This analysis aims to simulate the chemical and the physicochemical interactions induced by heavy …
Herschel/HIFI observations of Mars: First detection of O2 at submillimetre wavelengths and upper limits on HCl and H2O2
Blommaert, J. A. D. L.; Küppers, M.; Thomas, N. +47 more
We report on an initial analysis of Herschel/HIFI observations of hydrogen chloride (HCl), hydrogen peroxide (H2O2), and molecular oxygen (O2) in the Martian atmosphere performed on 13 and 16 April 2010 (Ls ~ 77°). We derived a constant volume mixing ratio of 1400 ± 120 ppm for O2 and determin…
K+a galaxies in the zCOSMOS survey . Physical properties of systems in their post-starburst phase
Bondi, M.; Kneib, J. -P.; Maccagni, D. +60 more
Aims: The identities of the main processes triggering and quenching star-formation in galaxies remain unclear. A key stage in evolution, however, appears to be represented by post-starburst galaxies. To investigate the prevalence of these galaxies and their impact on galaxy evolution in general, we initiated a multiwavelength study of galaxie…
NGC 6240: merger-induced star formation and gas dynamics
Genzel, R.; Sturm, E.; Tacconi, L. J. +9 more
We present spatially resolved integral field spectroscopic K-band data at a resolution of 0.13” (60 pc) and interferometric CO(2-1) line observations of the prototypical merging system NGC 6240. Despite the clear rotational signature, the stellar kinematics in the two nuclei are dominated by dispersion. We use Jeans modelling to derive the masses …
Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C
Menten, K. M.; Boulanger, F.; Falgarone, E. +72 more
We present Herschel/HIFI observations of the fundamental rotational transitions of ortho- and para-H_216O and H_218O in absorption towards Sagittarius B2(M) and W31C. The ortho/para ratio in water in the foreground clouds on the line of sight towards these bright continuum sources is generally consistent with the statistical …