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Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay
Campana, S.; Tiengo, A.; Mereghetti, S. +15 more
We report on 3.5 yr of Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in 2013 April. The magnetar spin-down has shown at least two episodes of period derivative increases so far, and it has slowed down regularly in the past year or so. We observed a slightly increasing trend in the time evolution of the …
Massive pre-main-sequence stars in M17
Kaper, L.; de Koter, A.; Sana, H. +6 more
The formation process of massive stars is still poorly understood. Massive young stellar objects (mYSOs) are deeply embedded in their parental clouds; these objects are rare, and thus typically distant, and their reddened spectra usually preclude the determination of their photospheric parameters. M17 is one of the best-studied H II regions in the…
Variability of the Magnetic Field Power Spectrum in the Solar Wind at Electron Scales
Escoubet, C. P.; Alexandrova, O.; Turc, L. +4 more
At electron scales, the power spectrum of solar-wind magnetic fluctuations can be highly variable and the dissipation mechanisms of the magnetic energy into the various particle species is under debate. In this paper, we investigate data from the Cluster mission’s STAFF Search Coil magnetometer when the level of turbulence is sufficiently high tha…
VLT/MUSE illuminates possible channels for Lyman continuum escape in the halo of SBS 0335-52E
Östlin, G.; Hayes, M.; Melinder, J. +4 more
We report on the discovery of ionised gas filaments in the circum-galactic halo of the extremely metal-poor compact starburst SBS 0335-052E in a 1.5 h integration with the MUSE integral-field spectrograph. We detect these features in Hα and [O III] emission down to a limiting surface-brightness of 5 × 10-19 erg s-1 cm-2<…
The Water Cycle
Montmessin, Franck; Fedorova, Anna; Langevin, Yves +2 more
NH3 (10-00) in the pre-stellar core L1544
Codella, C.; Pagani, L.; van Dishoeck, E. F. +11 more
Pre-stellar cores represent the initial conditions in the process of star and planet formation, therefore it is important to study their physical and chemical structure. Because of their volatility, nitrogen-bearing molecules are key to study the dense and cold gas present in pre-stellar cores. The NH3 rotational transition detected wit…
Spontaneous generation of bending waves in isolated Milky Way-like discs
Widrow, Lawrence M.; Chequers, Matthew H.
We study the spontaneous generation and evolution of bending waves in N-body simulations of two isolated Milky Way-like galaxy models. The models differ by their disc-to-halo mass ratios, and hence by their susceptibility to the formation of a bar and spiral structure. Seeded from shot noise in the particle distribution, bending waves rapidly form…
Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI
Eckart, Andreas; Combes, Françoise; Busch, Gerold +4 more
The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit
Smalley, Barry; Hellier, Coel; Triaud, Amaury H. M. J. +19 more
We report the discovery of an eclipsing binary system with mass-ratio q ∼ 0.07. After identifying a periodic photometric signal received by WASP, we obtained CORALIE spectroscopic radial velocities and follow-up light curves with the Euler and TRAPPIST telescopes. From a joint fit of these data we determine that EBLM J0555-57 consists of a sun-lik…
Simulated forecasts for primordial B -mode searches in ground-based experiments
Dunkley, Joanna; Næss, Sigurd; Alonso, David +1 more
Detecting the imprint of inflationary gravitational waves on the B -mode polarization of the cosmic microwave background (CMB) is one of the main science cases for current and next-generation CMB experiments. In this work we explore some of the challenges that ground-based facilities will have to face in order to carry out this measurement in the …