Search Publications
QuickPol: Fast calculation of effective beam matrices for CMB polarization
Ponthieu, Nicolas; Hivon, Eric; Mottet, Sylvain
Current and planned observations of the cosmic microwave background (CMB) polarization anisotropies, with their ever increasing number of detectors, have reached a potential accuracy that requires a very demanding control of systematic effects. While some of these systematics can be reduced in the design of the instruments, others will have to be …
Using red clump stars to correct the Gaia DR1 parallaxes
Chaplin, William J.; Davies, Guy R.; Girardi, Léo +14 more
Recent results have suggested that there is tension between the Gaia DR1 TGAS distances and the distances obtained using luminosities determined by eclipsing binaries or asteroseismology on red giant stars. We use the Ks-band luminosities of red clump stars, identified and characterized by asteroseismology, to make independent distance …
Star formation histories in mergers: the spatially resolved properties of the early-stage merger luminous infrared galaxies IC 1623 and NGC 6090
González Delgado, R. M.; Di Matteo, P.; Sánchez, S. F. +8 more
The role of major mergers in galaxy evolution is investigated through a detailed characterization of the stellar populations, ionized gas properties and star formation rates (SFR) in the early-stage merger luminous infrared galaxies (LIRGs) IC 1623 W and NGC 6090, by analysing optical integral field spectroscopy and high-resolution Hubble Space Te…
The near-surface methane humidity on Titan
Lora, Juan M.; Ádámkovics, Máté
We retrieve vertical and meridional variations of methane mole fraction in Titan's lower troposphere by re-analyzing near-infrared ground-based observations from 17 July 2014 UT (Ádámkovics et al., 2016). We generate synthetic spectra using atmospheric methane profiles that do not contain supersaturation or discontinuities to fit the observations,…
Effective Acceleration Model for the Arrival Time of Interplanetary Shocks driven by Coronal Mass Ejections
Paouris, Evangelos; Mavromichalaki, Helen
In a previous work (Paouris and Mavromichalaki in Solar Phys. 292, 30, 2017), we presented a total of 266 interplanetary coronal mass ejections (ICMEs) with as much information as possible. We developed a new empirical model for estimating the acceleration of these events in the interplanetary medium from this analysis. In this work, we present a …
The Role of the Most Luminous Obscured AGNs in Galaxy Assembly at z ∼ 2
Tsai, Chao-Wei; Moustakas, Leonidas; Stern, Daniel +14 more
We present Hubble Space Telescope WFC3 F160W imaging and infrared spectral energy distributions for 12 extremely luminous, obscured active galactic nuclei (AGNs) at 1.8 < z < 2.7 selected via “hot, dust-obscured” mid-infrared colors. Their infrared luminosities span (2-15) × 1013 L ⊙, making them among the most luminous…
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<…