Search Publications
An Expanded Very Large Array and CARMA Study of Dusty Disks and Torii with Large Grains in Dying Stars
Sahai, R.; Sánchez Contreras, C.; Morris, M. R. +2 more
We report the results of a pilot multiwavelength survey in the radio continuum (X, Ka, and Q bands, i.e., from 3.6 cm to 7 mm) carried out with the Expanded Very Large Array (EVLA) in order to confirm the presence of very large dust grains in dusty disks and torii around the central stars in a small sample of post-asymptotic giant branch (pAGB) ob…
Multi-wavelength observations of the young binary system Haro 6-10: The case of misaligned discs
Wolf, S.; Henning, T.; Roccatagliata, V. +3 more
Context. We present a multi-wavelength, high-resolution observational survey of the young binary system Haro 6-10 (GV Tau, IRAS 04263+2426), which harbours one of the few known infrared companions.
Aims: The primary goal of this project is to determine the physical and geometrical properties of the circumstellar and circumbinary material in t…
Gravitational lensing and dynamics in SL2S J02140-0535: probing the mass out to large radius
Richard, J.; Cabanac, R.; Limousin, M. +3 more
Context. Studying the density profiles of galaxy groups offers an important insight into the formation and evolution of the structures in the universe, since galaxy groups bridge the gap between single galaxies and massive clusters.
Aims: We aim to probe the mass of
No quantum gravity signature from the farthest quasars
Della Valle, M.; Gilmozzi, R.; Tamburini, F. +1 more
Context. Strings and other alternative theories describing the quantum properties of space-time suggest that space-time could present a foamy structure and also that, in certain cases, quantum gravity (QG) may manifest at energies much below the Planck scale. One of the observable effects could be the degradation of the diffraction images of dista…
Limits of Enceladus's ice shell thickness from tidally driven tiger stripe shear failure
Pappalardo, Robert T.; Olgin, John G.; Smith-Konter, Bridget R.
Enceladus's south polar thermal anomaly and water-rich plumes suggest the existence of a subsurface ocean, which is overlain by an ice shell of uncertain thickness. Our objective is to constrain Enceladus's ice shell thickness, through assessment of tidally driven Coulomb failure of Enceladus's tiger stripe faults. We find that thin to moderate ic…
Obliquity tides do not significantly heat Enceladus
Nimmo, F.; Chen, E. M. A.
Recently, Tyler [Tyler, R.H., 2009. Geophys. Res. Lett. 36, L15205; Tyler, R., 2011. Icarus, 211, 770-779] proposed that the tide due to an obliquity of greater than 0.1° might drive resonant flow in a liquid ocean at Enceladus, and that dissipation of the ocean's kinetic energy may be an alternate source for the observed global heat flux. While t…
X-ray spectroscopy of MXB 1728-34 with XMM-Newton
Robba, N. R.; Dauser, T.; Wilms, J. +8 more
We analyzed an XMM-Newton observation of the low-mass X-ray binary and atoll source MXB 1728-34. The source was in a low-luminosity state during the XMM-Newton observation, corresponding to a bolometric X-ray luminosity of 5 × 1036 d5.1 kpc2 erg s-1. The 1-11 keV X-ray spectrum of the source, obtained co…
Dusty Blast Waves of Two Young Large Magellanic Cloud Supernova Remnants: Constraints on Post-shock Compression
Blair, William P.; Reynolds, Stephen P.; Points, Sean +9 more
We present results from mid-IR spectroscopic observations of two young supernova remnants (SNRs) in the Large Magellanic Cloud made with the Spitzer Space Telescope. We imaged SNRs B0509-67.5 and B0519-69.0 with Spitzer in 2005, and follow-up spectroscopy presented here confirms the presence of warm, shock-heated dust, with no lines present in the…
Critical Differences and Clues in Eta Car's 2009 Event
Humphreys, Roberta M.; Davidson, Kris; Mehner, Andrea +3 more
We monitored Eta Carinae with the Hubble Space Telescope WFPC2 and Gemini GMOS throughout the 2009 spectroscopic event, which was expected to differ from its predecessor in 2003. Here we report major observed differences between events and their implications. Some of these results were quite unexpected. (1) The UV brightness minimum was much deepe…
Hubble Space Telescope WFC3 Early Release Science: Emission-line Galaxies from Infrared Grism Observations
Hathi, Nimish P.; Gardner, Jonathan P.; Mutchler, Max +29 more
We present grism spectra of emission-line galaxies (ELGs) from 0.6 to 1.6 µm from the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope. These new infrared grism data augment previous optical Advanced Camera for Surveys G800L 0.6-0.95 µm grism data in GOODS-South from the PEARS program, extending the wavelength coverage well pas…