Search Publications
A faint extended cluster in the outskirts of NGC 5128: evidence of a low mass accretion
Rejkuba, M.; Mouhcine, M.; Ibata, R. +1 more
We report the discovery of an extended globular cluster in a halo field in Centaurus A (NGC 5128), situated from the centre of that galaxy, imaged with the Advanced Camera for Surveys on board the Hubble Space Telescope. At the distance of the galaxy, the half-light radius of the cluster is rh ~ 17pc, placing it among the largest globul…
Inductive electric fields in the inner magnetosphere during geomagnetically active periods
Mende, S. B.; Zheng, Y.; Brandt, P. C. +3 more
The present study examines the characteristics of electric fields in the nightside inner magnetosphere during geomagnetically active periods. Electric field and magnetic field measurements made by the Cluster spacecraft on their perigee passes are used. The results are summarized as follows: (1) The duskward electric field component EY …
Interaction of Saturn's magnetosphere and its moons: 2. Shape of the Enceladus plume
Russell, C. T.; Khurana, K. K.; Gombosi, T. I. +3 more
The Saturnian moons in the inner magnetosphere are immersed in a plasma disk that rotates much faster than the moon's Keplerian speed. The interaction of the rotating plasma with the moons results in a disturbance in the Saturnian magnetospheric plasma that depends on the nature of obstacle that the moon represents. In particular at Enceladus, suc…
Unveiling Far-infrared Counterparts of Bright Submillimeter Galaxies Using PACS Imaging
Berta, S.; Magnelli, B.; Nordon, R. +35 more
We present a search for Herschel-PACS counterparts of dust-obscured, high-redshift objects previously selected at submillimeter and millimeter wavelengths in the Great Observatories Origins Deep Survey North field. We detect 22 of 56 submillimeter galaxies (SMGs, 39%) with a signal-to-noise ratio of >=3 at 100 µm down to 3.0 mJy, and/or a…
XMM-Newton unveils the complex iron Kα region of Mrk 279
Kaastra, J. S.; Arav, N.; Costantini, E. +4 more
We present the results of a ~160 ks-long XMM-Newton observation of the Seyfert 1 galaxy
The Young Interstellar Bubble Within the Rosette Nebula
Gull, T. R.; Freire Ferrero, R.; Bruhweiler, F. C. +1 more
We use high-resolution International Ultraviolet Explorer (IUE) data and the interstellar (IS) features of highly ionized Si IV and C IV seen toward the young, bright OB stars of NGC 2244 in the core of the Rosette Nebula to study the physics of young IS bubbles. Two discrete velocity components in Si IV and C IV are seen toward stars in the 6.2 p…
Energetic neutral atoms from Titan: Particle simulations in draped magnetic and electric fields
Saur, Joachim; Simon, Sven; Strobel, Darrell F. +2 more
Titan's atmosphere emits energetic neutral atoms (ENAs), which are being monitored for the first time by the Cassini spacecraft. These ENAs are generated by charge exchange processes of energetic ions with neutrals from Titan's atmosphere. In this work we investigate the morphology of the ENA emission from Titan's atmosphere with a three-dimension…
On the Flare Induced High-Frequency Global Waves in the Sun
García, R. A.; Venkatakrishnan, P.; Kumar, Brajesh +1 more
Recently, Karoff & Kjeldsen presented evidence of strong correlation between the energy in the high-frequency part (5.3 < ν < 8.3 mHz) of the acoustic spectrum of the Sun and the solar X-ray flux. They have used disk-integrated intensity observations of the Sun obtained from the Variability of solar IRradiance and Gravity Oscillations in…
Evidence of a Warm Absorber That Varies with Quasi-periodic Oscillation Phase in the Active Galactic Nucleus RE J1034+396
Miller, Jon M.; Maitra, Dipankar
A recent observation of the nearby (z = 0.042) narrow-line Seyfert 1 galaxy RE J1034+396 on 2007 May 31 showed strong quasi-periodic oscillations (QPOs) in the 0.3-10 keV X-ray flux. We present phase-resolved spectroscopy of this observation, using data obtained by the EPIC PN detector on board XMM-Newton. The "low" phase spectrum, associated with…
PKS 0537-286, carrying the information of the environment of SMBHs in the early Universe
Covino, S.; Ghisellini, G.; Pian, E. +9 more
Context. The high-redshift (z = 3.1) blazar PKS 0537-286, belonging to the flat spectrum radio quasar blazar subclass, is one of the most luminous active galactic nuclei (AGN) in the Universe. Blazars are very suitable candidates for multiwavelength observations. Indeed, the relativistic beaming effect at work within the jet enhances their luminos…