Search Publications

Direct imaging of Titan's extended haze layer from HST observations

Young, E. F.; Puetter, R.; Yahil, A.

In the early 1980s, both Voyager spacecraft imaged a detached haze layer surrounding Titan, separated from the main haze distribution by a gap at around ~300 km and merging into a hood of more concentrated haze at Titan's north pole. We have processed Hubble Space Telescope images of Titan with Lucy-Richardson and PIXON deconvolution software and …

X-ray broad line emission in Seyfert galaxies: Mrk 766 and NGC 4051

Page, M. J.; Branduardi-Raymont, G.; Mason, K. O. +3 more

Long (>100 ks) observations of the bright Seyfert galaxies Mrk 766 and NGC 4051 have been obtained using XMM- Newton. The RGS 5-38 Å spectra reveal evidence of broad features. These can be modelled with relativistic emission lines coming from the immediate vicinity of a massive rotating black hole. Lines of OVIII, NVII and CVI are required to r…

Observations of CME-related phenomena in a wide spectral range

Grechnev, V. V.; Uralov, A. M.; Borovik, V. N. +7 more

We study pre-eruptive, eruptive, and post-eruptive phenomena related to a CME that occurred on November 23, 2000 by means of joint analyses of data from various spectral ranges. Almost all known CME-associated phenomena were observed during this event, i.e., a filament eruption, solar flare, dimmings, and a post-eruptive arcade formation. Followin…

Huygens/HASI 2002 balloon test campaign: Probe trajectory and atmospheric vertical profiles reconstruction

Fulchignoni, M.; Colombatti, G.; Ferri, F. +2 more

In the framework of the activities going on in preparation for the mission of the Huygens probe in Titan's atmosphere (January 2005), the Huygens Atmospheric Structure Instrument (HASI) team scheduled and performed several balloon campaigns to test the HASI sensors' performance in flight conditions in the Earth's atmosphere. In particular, pressur…

Analysis of UBV photometry in selected area 133

Karataş, Y.; Bilir, S.; Karaali, S. +1 more

We interpret the de-reddened UBV data for the field SA 133 to deduce the stellar density and metallicity distribution functions. The logarithmic local space density for giants, D^*(0)=6.40, and the agreement of the luminosity function for dwarfs and sub-giants with the one of Hipparcos confirms the empirical method used for their separat…

Properties of the isolated neutron star RX J185635-3754

Burwitz, V.; Neuhäuser, R.; Pons, J. A. +5 more

Despite improved observational capabilities, the surface properties of neutron stars remain uncertain. In principle, multiwavelength spectra can reveal their compositions and angular diameters and constrain the interior equation of state. The Chandra LETG spectrum of the brightest isolated neutron star is a featureless continuum. The X-ray blackbo…

The Aligned z~1 Radio Galaxy 3C 280

Lacy, Mark; Stockton, Alan; Ridgway, Susan E.

The z~1 radio galaxy 3C 280 has a particularly striking rest-frame UV morphology, with multiple line and continuum components precisely aligned with the radio structure, including an obvious semicircular arc. Here we explore the nature of these various components by bringing together Hubble Space Telescope and ground-based imaging, ground-based sp…

Correction to ``ULF wave identification in the magnetosheath: The k-filtering technique applied to Cluster II data''

Balogh, A.; Belmont, G.; Sahraoui, F. +8 more

Detailed SUMER Observations of Coronal Loop Footpoint Dynamics

McIntosh, Scott W.; Poland, Arthur I.

For the most part, the characteristics of heating in the open corona and in closed coronal loops are determined by observing the emitted plasma intensity as a function of position and comparing this with model calculations. There are also some efforts that include observed velocity and still others that use theoretical physical processes such as e…

Shock-cloud interactions in the Vela SNR: preliminary results of an XMM-Newton observation

Miceli, M.; Bocchino, F.; Maggio, A.

The study of the clumpy and irregular features in the X-ray emission of middle-aged supernova remnants shells allows us to shed light on the various characteristic of the interstellar medium, like its structure and composition. We have observed with XMM-Newton a small knot in the Vela SNR, which previous ROSAT studies have indicated as one of the …