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Host Galaxies of Low-z Radio-loud Quasars: A Search of Hubble Space Telescope Archives
Treves, Aldo; Falomo, Renato; Pagani, Claudio
We searched the Hubble Space Telescope (HST) archives for unpublished Wide Field Planetary Camera 2 images of low-redshift (z<0.5) radio-loud quasars (RLQs). This led to the identification of 11 objects. Here we present the results of the analysis of these images from which we derive the properties of their host galaxies. All objects are clearl…
Hubble Space Telescope Imaging in the Chandra Deep Field-South. III. Quantitative Morphology of the 1 Million Second Chandra Counterparts and Comparison with the Field Population
Tozzi, P.; Hasinger, G.; Rosati, P. +8 more
We present quantitative morphological analyses of 37 Hubble Space Telescope (HST)/WFPC2 counterparts of X-ray sources in the 1 Ms Chandra Deep Field-South (CDFS). We investigate (1) one-dimensional surface brightness profiles via isophotal ellipse fitting; (2) two-dimensional, point-spread function-convolved, bulge+disk+nucleus profile fitting; (3…
Photometric Studies of the Triple Star ER Orionis
Kim, Ho-Il; Lee, Jae Woo; Kim, Chun-Hwey +2 more
A total of 1637 BVR CCD observations of the overcontact binary ER Ori are used as the basis for new light curves, including the first red one. From these measurements, new timings of minimum light have been calculated. The complex period variation can be sorted into a linear period improvement, a secular period increase of considerable magnitude, …
Delay in solar energetic particle onsets at high heliographic latitudes
Balogh, A.; Krucker, S.; Dalla, S. +9 more
Ulysses observations have shown that solar energetic particles (SEPs) can easily reach high heliographic latitudes. To obtain information on the release and propagation of SEPs prior to their arrival at Ulysses, we analyse the onsets of nine large high-latitude particle events. We measure the onset times in several energy channels, and plot them v…
On the origin of inner-source pickup ions
Wimmer-Schweingruber, Robert F.; Bochsler, Peter
In situ measurements of pickup ions (PUI) exhibit a component that has nearly thermalized with the solar wind. This implies an origin close to the Sun and is generally ascribed to interaction of the solar wind with interplanetary dust particles (IDPs). We propose a scenario for the origin of inner-source PUIs in which a population of very small ID…
Toroidal-shaped interplanetary disturbance associated with the halo coronal mass ejection event on 14 July 2000
Kojima, Masayoshi; Tokumaru, Munetoshi; Fujiki, Ken'ichi +2 more
Interplanetary scintillation (IPS) measurements made with the 327 MHz radio telescopes of the Solar-Terrestrial Environment Laboratory, Nagoya University, have been used to study a three-dimensional structure of the interplanetary (IP) disturbance associated with the halo coronal mass ejection (CME) event on 14 July 2000 (the so-called "Bastille D…
A Hubble Space Telescope WFPC2 Snapshot Survey of 2MASS-selected Red QSOs
Hines, Dean C.; Armus, Lee; Schmidt, Gary D. +5 more
Using simple infrared color selection, the Two Micron All Sky Survey (2MASS) has found a large number of red, previously unidentified, radio-quiet quasi-stellar objects (QSOs). Although missed by UV/optical surveys, the 2MASS QSOs have Ks-band luminosities that are comparable to ``classical'' QSOs. This suggests the possible discovery o…
Evidence of Flaring in a Transequatorial Loop on the Sun
Harra, Louise K.; Matthews, Sarah A.; van Driel-Gesztelyi, Lidia
We present evidence of flaring behavior in a transequatorial loop (TEL) that lights up in soft X-rays on 2000 July 13. The large loop structure connects NOAA Active Regions 9070/9066 in the northern hemisphere and AR 9069/9068 in the southern hemisphere. We follow the loop systems for 2 days and observe several pieces of evidence strongly suggesti…
Hipparcos red stars in the HpVT2 and VIC systems
Makarov, V. V.; Berdnikov, L. N.; Lebzelter, T. +6 more
For Hipparcos M, S, and C spectral type stars, we provide calibrated instantaneous (epoch) Cousins V - I color indices using newly derived HpVT2 photometry. Three new sets of ground-based Cousins VI data have been obtained for more than 170 carbon and red M giants. These datasets in combination with the published sources of V…
Solar maximum low-energy particle observations at heliographic latitudes above 75 degrees
Lario, D.; Reisenfeld, D. B.; Roelof, E. C. +1 more
We present a preliminary analysis of low-energy particle observations by the Ulysses and ACE spacecraft during the time intervals that Ulysses spent at heliographic latitudes above 75 degrees during its solar maximum orbit. The most southerly and northerly latitudes (80.2°) were reached by Ulysses in November 2000 and October 2001, respectively. T…