Search Publications
Resolving HD 100546 disc in the mid-infrared: Small inner disc and asymmetry near the gap
Jaffe, W.; Dominik, C.; Henning, Th. +5 more
Context. A region of roughly half of the solar system scale around the star HD 100546 is known to be largely cleared of gas and dust, in contrast to the outer disc that extends to about 400 AU. However, some material is observed in the immediate vicinity of the star, called the inner disc. Studying the structure of the inner and the outer disc is …
Radio Timing and Optical Photometry of the Black Widow System PSR J1518+0204C in the Globular Cluster M5
Dalessandro, E.; Ransom, S. M.; Ferraro, F. R. +5 more
We report on the determination of astrometric, spin, and orbital parameters for PSR J1518+0204C, a "black widow" binary millisecond pulsar in the globular cluster (GC) M5. The accurate position and orbital parameters obtained from radio timing allowed us to search for the optical companion. By using WFC3/Hubble Space Telescope images, we identifie…
General dissipative coefficient in warm intermediate inflation in Loop Quantum Cosmology in light of Planck and BICEP2
Videla, Nelson; Herrera, Ramón; Olivares, Marco
In this paper, we study a warm intermediate inflationary model with a general form for the dissipative coefficient Γ(T, ϕ) = CϕTm/ϕm-1 in the context of Loop Quantum Cosmology (LQC). We examine this model in the weak and strong dissipative regimes. In general, we discuss in great detail the characteristics of this …
Herschel Far-infrared Photometry of the Swift Burst Alert Telescope Active Galactic Nuclei Sample of the Local Universe. I. PACS Observations
Barger, A. J.; Cowie, L. L.; Mushotzky, R. F. +2 more
Far-Infrared (FIR) photometry from the Photodetector Array Camera and Spectrometer on the Herschel Space Observatory is presented for 313 nearby, hard X-ray selected galaxies from the 58 month Swift Burst Alert Telescope (BAT) Active Galactic Nuclei catalog. The present data do not distinguish between the FIR luminosity distributions at 70 and 160…
The 2011 Outburst of Recurrent Nova T Pyx: X-ray Observations Expose the White Dwarf Mass and Ejection Dynamics
Sokoloski, J. L.; Chomiuk, Laura; Kuulkers, Erik +9 more
The recurrent nova T Pyx underwent its sixth historical outburst in 2011, and became the subject of an intensive multi-wavelength observational campaign. We analyze data from the Swift and Suzaku satellites to produce a detailed X-ray light curve augmented by epochs of spectral information. X-ray observations yield mostly non-detections in the fir…
A coronal hole jet observed with Hinode and the Solar Dynamics Observatory
Young, Peter R.; Muglach, Karin
A small blowout jet was observed at the boundary of the south polar coronal hole on 2011 February 8 at around 21:00 UT. Images from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) revealed an expanding loop rising from one footpoint of a compact, bipolar bright point. Magnetograms from the Helioseismic Magnetic…
The First Ground-Level Enhancement of Solar Cycle 24 on 17 May 2012 and Its Real-Time Detection
Mavromichalaki, H.; Papaioannou, A.; Souvatzoglou, G. +2 more
Ground-level enhancements (GLEs) are defined as sudden increases in the recorded intensity of cosmic-ray particles, usually by neutron monitors (NMs). In this work we present a time-shifting analysis (TSA) for the first arriving particles that were detected at Earth by NMs. We also present an automated real-time GLE alert that has been developed a…
ALMA observations of cool dust in a low-metallicity starburst, SBS 0335-052
Maiolino, R.; Menten, K. M.; Hunt, L. K. +9 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 0 Band 7 observations of an extremely metal-poor dwarf starburst galaxy in the Local Universe, SBS 0335-052 (12 + log (O/H) ~ 7.2). With these observations, dust is detected at 870 µm (ALMA Band 7), but 87% of the flux in this band is due to free-free emission from the star…
The Spitzer Local Volume Legacy (LVL) global optical photometry
Johnson, Benjamin D.; Calzetti, Daniela; Kennicutt, Robert C. +6 more
We present the global optical photometry of 246 galaxies in the Local Volume Legacy (LVL) survey. The full volume-limited sample consists of 258 nearby (D < 11 Mpc) galaxies whose absolute B-band magnitude span a range of -9.6 < MB < -20.7 mag. A composite optical (UBVR) data set is constructed from observed UBVR and Sloan Digi…
A Tidal Disruption Event in a nearby Galaxy Hosting an Intermediate Mass Black Hole
Troja, E.; Butler, N. R.; Cenko, S. B. +9 more
We report the serendipitous discovery of a bright point source flare in the Abell cluster A1795 with archival EUVE and Chandra observations. Assuming the EUVE emission is associated with the Chandra source, the X-ray 0.5-7 keV flux declined by a factor of ~2300 over a time span of 6 yr, following a power-law decay with index ~2.44 ± 0.40. The Chan…