Search Publications
Negative running can prevent eternal inflation
Kinney, William H.; Freese, Katherine
Current data from the Planck satellite and the BICEP2 telescope favor, at around the 2 σ level, negative running of the spectral index of curvature perturbations from inflation. We show that for negative running α < 0, the curvature perturbation amplitude has a maximum on scales larger than our current horizon size. A condition for the absence …
Variable Stars and Stellar Populations in Andromeda XXI. II. Another Merged Galaxy Satellite of M31?
Cignoni, Michele; Marconi, Marcella; Ripepi, Vincenzo +8 more
B and V time-series photometry of the M31 dwarf spheroidal satellite Andromeda XXI (And XXI) was obtained with the Large Binocular Cameras at the Large Binocular Telescope. We have identified 50 variables in And XXI, of which 41 are RR Lyrae stars (37 fundamental-mode—RRab, and 4 first-overtone-RRc, pulsators) and 9 are Anomalous Cepheids (ACs). T…
O+ transport in the dayside magnetosheath and its dependence on the IMF direction
Nilsson, H.; Slapak, R.; Larsson, R. +1 more
Recent studies have shown that the escape of oxygen ions (O+) into the magnetosheath along open magnetic field lines from the terrestrial cusp and mantle is significant. We present a study of how O+ transport in the dayside magnetosheath depends on the interplanetary magnetic field (IMF) direction. There are clear asymmetries…
The link between mass distribution and starbursts in dwarf galaxies
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Skillman, Evan D. +3 more
Recent studies have shown that starburst dwarf galaxies have steeply rising rotation curves in their inner parts, pointing to a close link between the intense star formation and a centrally concentrated mass distribution (baryons and dark matter). More quiescent dwarf irregulars typically have slowly rising rotation curves, although some `compact'…
Exploring the Moon's surface for remnants of the lunar mantle 1. Dunite xenoliths in mare basalts. A crustal or mantle origin?
Shearer, Charles K.; Burger, Paul V.; Bell, Aaron S. +2 more
Remotely sensed observations from recent missions (e.g., GRAIL, Kaguya, Chandrayaan-1) have been interpreted as indicating that the deep crust and upper mantle are close to or at the lunar surface in many large impact basins (e.g., Crisium, Apollo, Moscoviense). If this is correct, the capability of either impact or volcanic processes to transport…
Search for sub-kilometre trans-Neptunian objects using CoRoT asteroseismology data
Chang, Hsiang-Kuang; Doressoundiram, Alain; Auvergne, Michel +3 more
We present the search for sub-kilometre trans-Neptunian objects (TNOs) by re-examining the CoRoT (Convection Rotation and Planetary Transits) asteroseismology observations. The total observation time employed in this work is about 144 000 star hours with signal-to-noise ratio larger than 1000 computed on 30-s intervals. 13 Possible Occultation Eve…
Planck revealed bulk motion of Centaurus A lobes
Nucita, A. A.; De Paolis, F.; Ingrosso, G. +8 more
Planck data towards the active galaxy Centaurus A are analyzed in the 70, 100 and 143 GHz bands. We find a temperature asymmetry of the northern radio lobe with respect to the southern one that clearly extends at least up to 5° from the Cen A center and diminishes towards the outer regions of the lobes. That transparent parameter - the temperature…
Deep near-infrared adaptive-optics observations of a young embedded cluster at the edge of the RCW 41 H II region
Zavagno, A.; Neichel, B.; Samal, M. R. +3 more
Aims: We investigate the star formation activity in a young star forming cluster embedded at the edge of the RCW 41 H ii region. As a complementary goal, we aim to demonstrate the gain provided by wide-field adaptive optics (WFAO) instruments to study young clusters.
Methods: We used deep, JHKs images from the newly commission…
Investigation of the RCR catalog sources in the millimeter and submillimeter ranges based on the Planck mission data
Verkhodanov, O. V.; Majorova, E. K.; Zhelenkova, O. P. +3 more
We have studied the regions of the microwave background radiation maps of the Planck experiment in the neighborhood of the RCR catalog radio sources. From the processed data for bright radio sources in the microwave range, we plotted the calibration curves which allow the brightness of the objects to be measured. For the first time, for 117 object…
The Chandra/HETG view of NGC 1365 in a Compton-thick state
Reeves, J. N.; Braito, V.; Gofford, J. +3 more
We present the analysis of a Chandra High-Energy Transmission Grating (HETG) observation of the local Seyfert galaxy NGC 1365. The source, well known for its dramatic X-ray spectral variability, was caught in a reflection-dominated, Compton-thick state. The high spatial resolution afforded by Chandra allowed us to isolate the soft X-ray emission f…