Search Publications
XMM-Newton Observations of SDSS J143030.22 - 001115.1: An Unusually Flat-Spectrum Active Galactic Nucleus
Williams, R.; Grupe, D.; Mathur, S. +3 more
We present XMM-Newton observations of the type 1 active galactic nucleus (AGN) SDSS 1430 - 0011 (z = 0.1032). The low signal-to-noise ratio spectrum of this source obtained in a snap shot Chandra observation showed an unusually flat continuum. With the follow-up XMM-Newton observations, we find that the source spectrum is complex; it either has an…
Study on solar sources and polar cap absorption events recorded in Antarctica
Damasso, M.; Perrone, L.; Parisi, M. +2 more
Particularly intense events occurred on the Sun in a period around minimum of solar activity during cycle 23. We investigated the characteristics of September 2005 and December 2006 events and the properties of the correlated observations of ionospheric absorption, obtained by a 30 MHz riometer installed at Mario Zucchelli Station (MZS-Antarctica)…
A multi-wavelength view of the archetypical CSS radio galaxy 3C303.1: Evidence for shocks and induced star formation
O'Dea, C. P.
I discuss multi-wavelength data on the archetypal CSS radio galaxy 3C303.1. The radio source is sub-galactic in scale where it can directly affect the ISM of the host galaxy. The emission line kinematics and ionization diagnostics are consistent with energy input from shocks driven by the radio source. The Spitzer IRS spectrum indicates that star …
Saturn Satellites as Seen by Cassini Mission
Capaccioni, F.; Orosei, R.; Cerroni, P. +5 more
In this paper we will summarize some of the most important results of the Cassini mission concerning the satellites of Saturn. The Cassini Mission was launched in October 1997 on a Titan IV-Centaur rocket from Cape Canaveral. Cassini mission was always at risk of cancelation during its development but was saved many times thanks to the great inter…
Blazars with Integral
Pian, E.; Hudec, R.; Blažek, M. +1 more
The analysis of the INTEGRAL data for blazars, a specific class of the active galactic nuclei, is described. These objects are promising objects for observations by INTEGRAL, especially during their active states. A strategy for their future investigation is proposed and discussed.
Density Effects on Mg II Emission Lines of Mira AB
Sanad, M. R.; Bobrowsky, M.; Hamdy, M. A. +1 more
We present ultraviolet spectra of the Mira AB binary system taken by the International Ultraviolet Explorer during the period from 1979 to 1995. In this study, we concentrated on the Mg II k and h emission lines arising primarily from Mira B. The broad Mg II profiles from Mira B are enhanced on the red side of the profile and obscured on the blue …
Results from DROXO. I. The variability of fluorescent Fe 6.4 keV emission in the young star Elias 29. High-energy electrons in the star's accretion tubes?
Micela, G.; Favata, F.; Giardino, G. +3 more
Gas kinematics in the halo of the warm ULIRG PKS1345+12
Tadhunter, Clive N.; González Delgado, Rosa M.; Rodríguez Zaurín, Javier +1 more
We use long-slit spectra taken with the William Herschel Telescope on La Palma and high-resolution Hubble Space Telescope imaging to study the gas kinematic in the halo of the ultraluminous infrared/radio galaxy PKS1345+12 ( z=0.122). Our long-slit spectra show line splitting at the locations of massive star clusters ( 106<M_{SSC}^{Y…
Observations of loss cone-shaped back streaming energetic protons upstream of the Earth's bow shock
Hasegawa, H.; Fujimoto, M.; Kasaba, Y. +10 more
Energetic ions are at times observed in the upstream region of the Earth's bow shock, and their origin is considered to be in the interaction with the shock front. While the energy of the solar wind ions is a few keV at most, the energy of the back streaming ions ranges from ∼5 keV to several MeV. In the present study we investigate back streaming…
Star-formation modes in the solar neighborhood
Alfaro, Emilio J.; Elias, Federico; Cabrera-Caño, Jesús
We perform a study into the spatial and kinematical distribution of young open clusters in the solar neighborhood, distinguishing between Gould Belt and local Galactic disk members. We use a previous estimate of the structural parameters of both systems obtained from a sample of O to B6 stars from Hipparcos. The two star-forming regions that domin…