Search Publications
VINCI-VLTI measurements of HR 4049: The physical size of the circumbinary envelope
Paresce, F.; Wittkowski, M.; Antoniucci, S.
We present the first detection of the envelope which surrounds the post-AGB binary source HR 4049. VINCI-VLTI K-band interferometric observations of this source imply the existence of a large structure with a Gaussian angular FWHM 22.4 ± 1.4 mas or uniform disk diameter of 34.9 ± 1.9 mas. With the Hipparcos parallax of 1.50 ± 0.64 mas these values…
A cold globule with a Class 0/I embedded source
Lemke, D.; Lehtinen, K.; Mattila, K.
Infrared observations of the dark cloud DC 303.8-14.2 and the embedded point source IRAS 13036-7644 have been made with the ISOPHOT instrument aboard ISO at 7.7 µm, 60 µm, 100 µm and 200 µm. We have compared the properties of dust in DC 303.8-14.2 and the Thumbprint Nebula (TPN), a morphologically similar globule but withou…
On the Discovery of the First Galaxy Selected at 350 Microns
Eisenhardt, Peter R.; Clements, David L.; Gonzalez, Anthony H. +17 more
We report the detection of a 3.6 σ source selected at 350 µm in the Boötes Deep Field. The source, the first short-wavelength submillimeter-selected galaxy (SSG 1), was discovered as part of a blank-field extragalactic survey using the 350 µm-optimized Submillimeter High Angular Resolution Camera (SHARC II) at the Caltech Submillimeter…
Comparison of blinkers and explosive events: A case study
Innes, D. E.; Parnell, C. E.; Brown, D. S. +1 more
Blinkers are brightenings at network cell junctions that are traditionally identified with SOHO/CDS and explosive events or high velocity events are identified in high resolution UV spectra obtained from HRTS and SOHO/SUMER. Criteria are determined to facilitate objective automatic identification of both blinkers and explosive events in both SOHO/…
Comparison of the effects of two models for perpendicular diffusion on cosmic-ray latitudinal gradients
Matthaeus, W. H.; Bieber, J. W.; Burger, R. A. +2 more
We compare the effects of two different models for perpendicular diffusion on the latitudinal gradients of galactic cosmic ray protons during solar minimum conditions. These two models correspond to the newly developed non-linear guiding center theory [Matthaeus, W.H., Qin, G., Bieber, J.W., Zank, G.P. Nonlinear collisionless perpendicular diffusi…
A Study of Far-Ultraviolet Extinction in the Upper Scorpius Cloud Using the SPINR Sounding Rocket Experiment
Chakrabarti, S.; Lewis, N. K.; Cook, T. A.
In this study, six new interstellar extinction curves in the far-ultraviolet are presented using data from a sounding rocket experiment. The sounding rocket data were combined with IUE data for six lines of sight in the Upper Scorpius group to cover the wavelength range of 912-3030 Å. The extinction curves were produced using the pair comparison m…
Probing the dark matter profile of hot clusters and the M- T relation with XMM- Newton
Arnaud, M.; Pointecouteau, E.; Pratt, G. W.
We present results based on XMM- Newton observations of a small sample of hot galaxy clusters. Making a full use of XMM- Newton's spectro-imaging capabilities, we have extracted the radial temperature profile and gas density profile, and with this information, calculated the total mass profile of each cluster (under the assumption of hydrostatic e…
Probing the nuclear obscuration in radio-galaxies with near infrared imaging
Capetti, A.; Marchesini, D.; Celotti, A.
We present the first near-infrared (K'-band) homogeneous observations of a complete sub-sample of the 3CR radio catalogue comprising all High Excitation Galaxies (HEGs) at z <0.3. After showing that the surface brightness decomposition technique to measure central point-like sources is affected by significant uncertainties for the objects in th…
Coupling the Solar-Wind/IMF to the Ionosphere Through the High Latitude CUSPS
Maynard, Nelson C.
Magnetic merging is a primary means for coupling energy from the solar wind into the magnetosphere–ionosphere system. The location and nature of the process remain as open questions. By correlating measurements from diverse locations and using large-scale MHD models to put the measurements in context, it is possible to constrain our interpretation…
A search for warm-hot intergalactic medium features in the X-ray spectra of Mkn 421 with the XMM-Newton RGS
Tagliaferri, G.; Ghisellini, G.; Tavecchio, F. +2 more
We present the high-resolution X-ray spectra of Mkn 421 obtained in November 2003 with the RGS aboard the XMM-Newton satellite. This Target of Opportunity observation was triggered because the source was in a high state of activity in the X-ray band. These data are compared with three archival RGS observations of the same source performed in Novem…