Search Publications
Mapping the solar wind HI outflow velocity in the inner heliosphere by coronagraphic ultraviolet and visible-light observations
Sasso, C.; Romoli, M.; Andretta, V. +18 more
We investigated the capability of mapping the solar wind outflow velocity of neutral hydrogen atoms by using synergistic visible-light and ultraviolet observations. We used polarised brightness images acquired by the LASCO/SOHO and Mk3/MLSO coronagraphs, and synoptic Lyα line observations of the UVCS/SOHO spectrometer to obtain daily maps of solar…
Formation of the young compact cluster GM 24 triggered by a cloud-cloud collision
Tachihara, Kengo; Fukui, Yasuo; Sano, Hidetoshi +7 more
High-mass star formation is an important step which controls galactic evolution. GM 24 is a heavily obscured star cluster including a single O9 star with more than ∼100 lower-mass stars within a 0.3 pc radius toward (l, b) ∼ (350.5°, 0.96°), close to the Galactic mini-starburst NGC 6334. We found two velocity components associated with the cluster…
Empirical Relations for the Accurate Estimation of Stellar Masses and Radii
Chaplin, William J.; Davies, Guy R.; Moya, Andy +1 more
In this work, we have taken advantage of the most recent accurate stellar characterizations carried out using asteroseismology, eclipsing binaries and interferometry to evaluate a comprehensive set of empirical relations for the estimation of stellar masses and radii. We have gathered a total of 934 stars—of which around two-thirds are on the main…
A High Space Density of L* Active Galactic Nuclei at z ∼ 4 in the COSMOS Field
Fiore, F.; Grazian, A.; Boutsia, K. +2 more
Identifying the source population of ionizing radiation, responsible for the reionization of the universe, is currently a hotly debated subject with conflicting results. Studies of faint, high-redshift star-forming galaxies, in most cases, fail to detect enough escaping ionizing radiation to sustain the process. Recently, the capacity of bright qu…
A Detection of Sgr A* in the Far Infrared
Fritz, Tobias K.; Ponti, Gabriele; Genzel, Reinhard +14 more
We report the first detection of the Galactic Center massive black hole, Sgr A*, at 100 µm and 160 µm. Our measurements were obtained with PACS on board the Herschel satellite. While the warm dust in the Galactic Center is too bright to allow for a direct detection of Sgr A*, we measure a significant and simultaneous variation of its f…
A Model-independent Test of Cosmic Isotropy with Low-z Pantheon Supernovae
Alcaniz, Jailson S.; Andrade, Uendert; Bengaly, Carlos A. P. +1 more
The assumption of homogeneity and isotropy on large scales is one of the main hypotheses of the standard cosmological model. In this paper, we revisit a test of cosmological isotropy using type Ia supernova (SN Ia) distances provided by the latest SN Ia compilation available, namely, the Pantheon compilation. We perform a model-independent analysi…
Photochemistry, mixing and transport in Jupiter's stratosphere constrained by Cassini
Sinclair, J. A.; Hue, V.; Cavalié, T. +2 more
In this work, we aim at constraining the diffusive and advective transport processes in Jupiter's stratosphere, using Cassini/CIRS observations published by Nixon et al. (2007,2010). The Cassini-Huygens flyby of Jupiter on December 2000 provided the highest spatially resolved IR observations of Jupiter so far, with the CIRS instrument. The IR spec…
The Far-Infrared Radio Correlation at low radio frequency with LOFAR/H-ATLAS
Prandoni, I.; Hardcastle, M. J.; Dunne, L. +14 more
The radio and far-infrared luminosities of star-forming galaxies are tightly correlated over several orders of magnitude; this is known as the far-infrared radio correlation (FIRC). Previous studies have shown that a host of factors conspire to maintain a tight and linear FIRC, despite many models predicting deviation. This discrepancy between exp…
The perturbed sublimation rim of the dust disk around the post-AGB binary IRAS08544-4431
Regibo, S.; Min, M.; Van Winckel, H. +4 more
Context. Post-asymptotic giant branch (post-AGB) binaries are surrounded by stable dusty and gaseous disks similar to the ones around young stellar objects. Whereas, significant effort has been spent on modeling observations of disks around young stellar objects, the disks around post-AGB binaries have received significantly less attention, even t…
The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
Done, Chris; Landt, Hermine; Boisson, Catherine +7 more
The detection of several radio-loud narrow-line Seyfert 1 (NLS1) galaxies by the Fermi Gamma-Ray Space Telescope hints at the existence of a rare, new class of γ-ray emitting active galactic nuclei with low black hole masses. Like flat spectrum radio quasars (FSRQs), their γ-ray emission is thought to be produced via the external Compton mechanism…