Search Publications
MAGIC Observations of Very High Energy γ-Rays from HESS J1813-178
Bastieri, D.; Ciprini, S.; Longo, F. +130 more
Recently, the HESS collaboration has reported the detection of γ-ray emission above a few hundred GeV from eight new sources located close to the Galactic plane. The source HESS J1813-178 has sparked particular interest, as subsequent radio observations imply an association with supernova remnant G12.82-0.02. Triggered by the detection in very hig…
White Dwarf-Red Dwarf Systems Resolved with the Hubble Space Telescope. I. First Results
Hoard, D. W.; Farihi, J.; Wachter, S.
First results are presented for a Hubble Space Telescope (HST) Advanced Camera for Surveys snapshot study of white dwarfs with likely red dwarf companions. Of 48 targets observed and analyzed so far, 27 are totally or partially resolved into two or more components, while an additional 15 systems are almost certainly unresolved binaries. These resu…
Surface Magnetism Effects in Time-Distance Helioseismology
Zhao, Junwei; Kosovichev, Alexander G.
Recent observations of helioseismic holography revealed that magnetic fields that are inclined relative to the line-of-sight direction could cause systematic variations in measured acoustic phase shifts (hereafter, inclined magnetic field effect) and that the presence of surface magnetic field may shift the phases and impair the coherence of acous…
Near-Infrared Synthetic Images of Protostellar Disks and Envelopes
Stassun, K.; Wood, K.; Whitney, B. A. +1 more
We present a grid of near-infrared (IR) synthetic images of pre-main-sequence stars at different stages of evolution, which we simulate by varying envelope mass, disk radius and mass, and outflow cavity shape. Our aim is to determine how variations in physical properties of young stellar objects (e.g., mass infall rate, disk size) affect their obs…
The BH mass of nearby QSOs: a comparison of the bulge luminosity and virial methods
Falomo, R.; Uslenghi, M.; Treves, A. +1 more
We report on the analysis of the photometric and spectroscopic properties of a sample of 29 low-redshift (z < 0.6) QSOs for which both Hubble Space Telescope (HST) WFPC2 images and ultraviolet HST FOS spectra are available. For each object we measure the R-band absolute magnitude of the host galaxy, the CIV(1550Å) linewidth and the 1350Å contin…
The Morphological Demographics of Galaxies in the Advanced Camera for Surveys Hubble Ultra Deep Parallel Fields
Infante, Leopoldo; Benítez, Narciso; Blakeslee, John P. +4 more
We present a morphological analysis of distant field galaxies using the deep Advanced Camera for Surveys images from the public parallel Near-Infrared Camera and Multi-Object Spectrometer observations of the Hubble Ultra Deep Field obtained in the F435W (B435), F606W (V606), F775W (i775), and F850LP (z850
Large-Scale Activities Associated with the 2003 October 29 X10 Flare
Liu, Chang; Wang, Haimin; Deng, Na +2 more
We present a multiwavelength study focusing on the large-scale activities associated with the 2003 October 29 X10 flare and a halo CME. This event was strong enough to clearly show several large-scale activities, such as remote brightenings, Moreton waves at Hα off-bands, and type II radio bursts, which offers an excellent opportunity to clarify t…
Multiwavelength Star Formation Indicators: Observations
Giavalisco, M.; Leitherer, C.; Armus, L. +5 more
We present a compilation of multiwavelength data on different star formation indicators for a sample of nearby star forming galaxies. Here we discuss the observations, reductions and measurements of ultraviolet images obtained with STIS on board the Hubble Space Telescope (HST), ground-based Hα, and VLA 8.46 GHz radio images. These observations ar…
The Flux-Rope Scaling of the Acceleration of Coronal Mass Ejections and Eruptive Prominences
Schuck, P. W.; Chen, J.; Vourlidas, A. +2 more
The new flux-rope scaling law of the acceleration of coronal mass ejections (CMEs) derived by Chen & Krall is quantitatively tested by comparing the theoretical prediction with the near-Sun acceleration profiles of 13 eruptive prominences (EPs) and four CMEs. A CME and associated EP are assumed to be organized by an underlying magnetic flux ro…
Titan's surface albedo variations over a Titan season from near-infrared CFHT/FTS spectra
Lellouch, E.; Rannou, P.; Coustenis, A. +5 more
We have observed Titan in a series of campaigns from 1991 to 1996 with the Fourier Transform Spectrometer on the CFH telescope. The data acquired provide a lightcurve from the geometric albedos in the 0.9- 2.5µm spectral region. The 1991-1993 data were previously analyzed in Coustenis et al. [1995. Titan's surface: composition and variabilit…