Search Publications
The formation of stellar nuclear discs in bar-induced gas inflows
Debattista, Victor P.; Erwin, Peter; Earp, Samuel W. F. +2 more
The role of gas in the mass assembly at the nuclei of galaxies is still subject to some uncertainty. Stellar nuclear discs bridge the gap between the large-scale galaxy and the central massive objects that reside there. Using a high-resolution simulation of a galaxy forming out of gas cooling and settling into a disc, we study the formation and pr…
Combining Planck data with large scale structure information gives a strong neutrino mass constraint
Riemer-Sørensen, Signe; Davis, Tamara M.; Parkinson, David
We present the strongest current cosmological upper limit on the neutrino mass of ∑mν<0.18 eV (95% confidence). It is obtained by adding observations of the large-scale matter power spectrum from the WiggleZ Dark Energy Survey to observations of the cosmic microwave background data from the Planck surveyor, and measurements of the ba…
Atmosphere/mantle coupling and feedbacks on Venus
Gillmann, Cedric; Tackley, Paul
We investigate the coupled evolution of the atmosphere and mantle on Venus. Here we focus on mechanisms that deplete or replenish the atmosphere: atmospheric escape to space and volcanic degassing of the mantle. These processes are linked to obtain a coupled model of mantle convection and atmospheric evolution, including feedback of the atmosphere…
Blue Straggler Masses from Pulsation Properties. I. The Case of NGC 6541
Dalessandro, E.; Marconi, M.; Bono, G. +3 more
We used high spatial resolution images acquired with the Wide Field Camera 3 on board Hubble Space Telescope to probe the population of variable blue straggler stars (BSSs) in the central region of the poorly studied Galactic globular cluster NGC 6541. The time sampling of the acquired multiwavelength (F390W, F555W, and F814W) data allowed us to d…
Inflation with moderately sharp features in the speed of sound: Generalized slow roll and in-in formalism for power spectrum and bispectrum
Hu, Bin; Torrado, Jesús; Achúcarro, Ana +2 more
We continue the study of mild transient reductions in the speed of sound of the adiabatic mode during inflation, of their effect on the primordial power spectrum and bispectrum, and of their detectability in the cosmic microwave background (CMB). We focus on the regime of moderately sharp mild reductions in the speed of sound during uninterrupted …
Open questions on prominences from coordinated observations by IRIS, Hinode, SDO/AIA, THEMIS, and the Meudon/MSDP
Golub, L.; Schmieder, B.; Tian, H. +5 more
Context. A large prominence was observed by multiple instruments on the ground and in space during an international campaign on September 24, 2013, for three hours (12:12 UT -15:12 UT). Instruments used in the campaign included the newly launched (June 2013) Interface Region Imaging Spectrograph (IRIS), THEMIS (Tenerife), the Hinode Solar Optical …
A Full-sky, High-resolution Atlas of Galactic 12 µm Dust Emission with WISE
Meisner, Aaron M.; Finkbeiner, Douglas P.
We describe our custom processing of the entire Wide-field Infrared Survey Explorer (WISE) 12 µm imaging data set, and present a high-resolution, full-sky map of diffuse Galactic dust emission that is free of compact sources and other contaminating artifacts. The principal distinctions between our resulting co-added images and the WISE Atlas…
New Perspective on Galaxy Outflows from the First Detection of Both Intrinsic and Traverse Metal-line Absorption
Martin, Crystal L.; Bouché, Nicolas; Kacprzak, Glenn G. +6 more
We present the first observation of a galaxy (z = 0.2) that exhibits metal-line absorption back-illuminated by the galaxy (down-the-barrel) and transversely by a background quasar at a projected distance of 58 kpc. Both absorption systems, traced by Mg II, are blueshifted relative to the galaxy systemic velocity. The quasar sight line, which resid…
Reproducing properties of MW dSphs as descendants of DM-free TDGs
Kroupa, Pavel; Hammer, François; Puech, Mathieu +4 more
The Milky Way (MW) dwarf spheroidal (dSph) satellites are known to be the most dark-matter (DM) dominated galaxies with estimates of dark-to-baryonic matter reaching even above 100. It comes from the assumption that dwarfs are dynamically supported by their observed velocity dispersions. However, their spatial distributions around the MW are not a…
ALMA reveals a warm and compact starburst around a heavily obscured supermassive black hole at z = 4.75
Daddi, E.; Elbaz, D.; Maiolino, R. +19 more
We report ALMA Cycle 0 observations at 1.3 mm of LESS J033229.4-275619 (XID403), an ultraluminous infrared galaxy at z = 4.75 in the Chandra Deep Field South hosting a Compton-thick QSO. The source is not resolved in our data at a resolution of ~0.75 arcsec, placing an upper-limit of 2.5 kpc to the half-light radius of the continuum emission from …