Search Publications
L shell distribution of energetic electrons at Saturn
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +1 more
Energetic electron fluxes (110-485 keV) observed by the MIMI/LEMMS instrument on the Cassini mission to Saturn were averaged into azimuthal bins and L shell bins for the period from day 150 2004 to day 366 2008. In local time, the electrons fluxes maximize on the night side between the Mimas and Rhea L shells and have a minimum near noon. This loc…
Detection of X-rays from the jet-driving symbiotic star MWC 560
Stute, M.; Sahai, R.
Aims: We report the detection of X-ray emission from the jet-driving symbiotic star MWC 560.
Methods: We observed MWC 560 with XMM-Newton for 36 ks. We fitted the spectra from the EPIC pn, MOS1 and MOS2 instruments with XSPEC and examined the light curves with the package XRONOS.
Results: The spectrum can be fitted with a highly absorbed h…
Diffuse Cluster-Like Radio Emission in Poor Environments
Rudnick, Lawrence; Brown, Shea
We present a study of the spectral, polarimetric, morphological, and environmental properties of the diffuse radio source 0809+39 using observations taken with the Westerbork Synthesis Radio Telescope, the Very Large Array, and archival optical and X-ray data. The source has two distinct diffuse, steep-spectrum components, one in the north that is…
The ACS Survey of Galactic Globular Clusters. VI. NGC 6366: A Heavily Stripped Galactic Globular Cluster
Anderson, Jay; Dotter, Aaron; Sarajedini, Ata +12 more
We have used observations obtained as part of the Hubble Space Telescope/ACS Survey of Galactic globular clusters (GCs) to construct a color-magnitude diagram for the bulge cluster, NGC 6366. The luminosity function derived from those data extends to M F606W ~ 9, or masses of ~0.3 M sun. Unlike most GCs, the mass function pea…
NICMOS Photometry of the Unusual Dwarf Planet Haumea and its Satellites
Brown, M. E.; Fraser, W. C.
We present here Hubble Space Telescope NICMOS F110W and F160W observations of Haumea, and its two satellites Hi'iaka and Namaka. From the measured (F110W-F160W) colors of -1.208 ± 0.004, -1.48 ± 0.06, and -1.4 ± 0.2 mag for each object, respectively, we infer that the 1.6 µm water-ice absorption feature depths on Hi'iaka and Namaka are at le…
Cassini-Huygens results on Titan's surface
Coustenis, Athena; Hirtzig, Mathieu
Our understanding of Titan, Saturn's largest satellite, has recently been considerably enhanced, thanks to the Cassini-Huygens mission. Since the Saturn Orbit Injection in July 2004, the probe has been harvesting new insights of the Kronian system. In particular, this mission orchestrated a climax on January 14, 2005 with the descent of the Huygen…
Modeling the X-ray emission of SN 1993J
Fransson, C.; Nymark, T. K.; Chandra, P.
Aims: We investigate the effects of radiative shocks on the observed X-ray emission from the type II supernova SN 1993J. To this end, the X-ray emission is modeled as a result of the interaction between the supernova ejecta and a dense circumstellar medium at an age of 8 years.
Methods: The circumstances under which the reverse shock is radiat…
The role of environment in the morphological transformation of galaxies in 9 rich intermediate redshift clusters
Pelló, R.; Huertas-Company, M.; Soucail, G. +1 more
Context: Rich clusters offer a unique laboratory for studying the effects of local environment on the morphological transformation of galaxies moving from the blue star-forming cloud to the red passive sequence. Due to the high-density, any environmental process should be more pronounced there compared to the field population.
Aims: Ideally, w…
Studying X-ray reprocessing and continuum variability in quasars: PG 1211+143
Bachev, R.; Semkov, E.; Gallo, L. C. +5 more
We present the results from a monitoring campaign of the Narrow-Line Seyfert 1 galaxy PG 1211+143. The object was monitored with ground-based facilities (UBVRI photometry; from 2007 February to July) and with Swift [X-ray photometry/spectroscopy and ultraviolet (UV)/optical photometry; between 2007 March and May]. We found PG 1211+143 in a histori…
Uniting the Quiescent Emission and Burst Spectra of Magnetar Candidates
Yamaoka, Kazutaka; Nakagawa, Yujin E.; Yoshida, Atsumasa +1 more
Spectral studies of quiescent emission and bursts of magnetar candidates based on XMM-Newton, Chandra, and Swift data are presented. Spectra of both the quiescent emission and the burst for most magnetar candidates are reproduced by a photoelectrically absorbed two-blackbody function (2BB). There is a strong correlation between the lower and highe…