Search Publications
On the X-ray emission of z ∼2 radio galaxies: IC scattering of the CMB and no evidence for fully-formed potential wells
Pentericci, L.; Röttgering, H. J. A.; Miley, G. K. +3 more
We present the results of 20 ks Chandra observations for each of 5 radio galaxies in the redshift range 2.0<z<2.6. The goals were to (i) study the nature of their non-thermal X-ray emission; (ii) investigate the presence and amount of hot gas; and (iii) look for active galactic nuclei (AGN) overdensities in fields around high redshift radio …
The host galaxy/AGN connection in nearby early-type galaxies. Sample selection and hosts brightness profiles
Capetti, A.; Balmaverde, B.
This is the first of a series of three papers exploring the connection between the multiwavelength properties of AGNs in nearby early-type galaxies and the characteristics of their hosts. We selected two samples, both with high resolution 5 GHz VLA observations available and providing measurements down to 1 mJy level, reaching radio-luminosities a…
XTE J1550-564: INTEGRAL Observations of a Failed Outburst
Shrader, C. R.; Sturner, S. J.
The well-known black hole X-ray binary transient XTE J1550-564 underwent an outburst during the spring of 2003, which was substantially underluminous in comparison to previous periods of peak activity in that source. In addition, our analysis shows that it apparently remained in the hard spectral state over the duration of that outburst. This is a…
Diffuse radio emission in a REFLEX cluster
Böhringer, H.; Govoni, F.; Giovannini, G. +2 more
Deep Very Large Array radio observations are presented for the REFLEX clusters RXC J0437.1{+}0043 and RXC J1314.4{-}2515. They are at similar distances and show similar X-ray luminosity, but they are quite different in X-ray structure. Indeed RXC J0437.1{+}0043 is regular and relaxed, whereas RXC J1314.4{-}2515 is characterized by substructure and…
The continuum and narrow-line region of the narrow-line Seyfert 1 galaxy Mrk 766
Contini, M.; Rodríguez-Ardila, A.; Viegas, S. M.
We present the first spectroscopic observations in the interval 0.8-4.0 µm, complemented with existing Hubble Space Telescope ultraviolet (UV) and optical spectroscopy, of the narrow-line Seyfert 1 galaxy Mrk 766. The near-infrared spectrum is characterized by numerous permitted lines of HI, HeI, HeII and FeII, and forbidden lines of [SII], …
Statistical survey of earthbound interplanetary shocks, associated coronal mass ejections and their space weather consequences
Tappin, S. J.; Howard, T. A.
A comprehensive statistical analysis of events relevant to space weather over the 80 month period from January 1998 to August 2004 is presented. A database has been constructed using data from instruments from the SOHO, ACE, WIND and GOES spacecraft, as well as ground magnetometer data. Parameters investigated include times and epochs of halo and …
FUSE Determination of a Low Deuterium Abundance along an Extended Sight Line in the Galactic Disk
Moos, H. W.; Chayer, P.; Dupuis, J. +5 more
We present a study of the deuterium abundance along the extended sight line toward HD 90087 with the Far Ultraviolet Spectroscopic Explorer (FUSE). HD 90087 is a O9.5 III star located in the Galactic disk at a distance of ~2.7 kpc away from the Sun. Both in terms of distance and column densities, HD 90087 has the longest and densest sight line obs…
Energetic Neutral Atom Emissions from Titan Interaction with Saturn's Magnetosphere
Krimigis, S. M.; Mitchell, D. G.; Roelof, E. C. +3 more
The Cassini Magnetospheric Imaging Instrument (MIMI) observed the interaction of Saturn's largest moon, Titan, with Saturn's magnetosphere during two close flybys of Titan on 26 October and 13 December 2004. The MIMI Ion and Neutral Camera (INCA) continuously imaged the energetic neutral atoms (ENAs) generated by charge exchange reactions between …
Sculpting a Pre-planetary Nebula with a Precessing Jet: IRAS 16342-3814
Sahai, R.; Sánchez Contreras, C.; Le Mignant, D. +2 more
We have imaged the bipolar pre-planetary nebula IRAS 16342-3814 with the Keck adaptive optics (AO) system in four near-infrared bands in the 1.6-4.7 µm range. The lobes, which showed smoothly varying brightness distributions in previous optical images taken with the Hubble Space Telescope, have a limb-brightened appearance in the AO images, …
Isothermal Bias of the ``Filter Ratio'' Method for Observations of Multithermal Plasma
Schmelz, J. T.; DeLuca, E. E.; Weber, M. A. +1 more
An early result from the Transition Region and Coronal Explorer (TRACE) was that the EUV filter ratios for many narrow coronal loops (widths of a few arcseconds) were found to cluster within the small range 0.50-1.70, as functions of position along loop length. The most common interpretation is that the temperature along the loop is in fact nearly…