Search Publications
Far infrared observations of pre-protostellar sources in Lynds 183
Prusti, T.; Juvela, M.; Lemke, D. +3 more
Using ISOPHOT maps at 100 and 200 mu m and raster scans at 100, 120, 150 and 200 mu m we have detected four unresolved far-infrared sources in the high latitude molecular cloud L 183. Two of the sources are identified with 1.3 mm continuum sources found by Ward-Thompson et al. (\cite{wthompson94}, \cite{wthompson00}) and are located near the tempe…
Detection of Far-Infrared Features in Star-Forming Regions
Onaka, Takashi; Okada, Yoko
We report the detection of a feature at 65 µm and a broad feature around 100 µm in the far-infrared spectra of the diffuse emission from two active star-forming regions, the Carina Nebula and Sharpless 171. The features are seen in the spectra over a wide area of the observed regions, indicating that the carriers are fairly ubiquitous …
Cluster observations of the high-altitude cusp for northward interplanetary magnetic field: A case study
Lavraud, B.; Dunlop, M. W.; Bosqued, J. M. +7 more
Since January 2001, the multisatellite and multiinstrument CLUSTER mission gives a unique opportunity to study the structure and dynamics of the high-altitude polar cusp. On 17 March 2001, CLUSTER sampled the northern high-altitude cusp (7-9RE) around noon for more than 1 hour during very quiet interplanetary and magnetospheric conditio…
13C isotope effects on infrared bands of quenched carbonaceous composite (QCC)
Onaka, T.; Yamamura, I.; Wada, S. +2 more
We investigate carbon isotope effects on the infrared bands of a laboratory analogue of carbonaceous dust, the quenched carbonaceous composite (QCC), synthesized from a plasma gas of methane with various 12C/13C ratios. Peak shifts to longer wavelengths due to the substitution of 12C by 13C are clearly o…
Optical Positions of ICRF Sources Using UCAC Reference Stars
Zacharias, N.; Assafin, M.; Zacharias, M. I. +4 more
New optical positions on the 30 mas precision level have been obtained for 172 extragalactic International Celestial Reference Frame (ICRF) sources mainly in the range -30°<=δ<=+25°. Results are presented from a pilot investigation including four Cerro Tololo (CTIO) 0.9 m runs (1999-2001). Reference stars in the R~10-16.5 mag range from a pr…
An X-Ray Image of the Composite Supernova Remnant SNR G16.7+0.1
Gotthelf, E. V.; Agüeros, Marcel A.; Helfand, David J.
We have observed the Galactic supernova remnant G16.7+0.1 for 13 ks using the EPIC cameras on board the XMM-Newton X-Ray Observatory, producing the first X-ray image of the remnant. This composite radio remnant has a core radio flux density of only 100 mJy, making it one of the faintest radio synchrotron nebulae yet detected, although the core-to-…
The First Results of Observations of the Transient Pulsar SAX J2103.5+4545 by the INTEGRAL Observatory
Lutovinov, A. A.; Revnivtsev, M. G.; Molkov, S. V.
We present the preliminary results of our analysis of the observations of the X-ray pulsar SAX J2103.5+4545 by the INTEGRAL Observatory in December 2002. We mapped this region of the sky in a wide energy range, from 3 to 200 keV. The detection of the source is shown to be significant up to energies of ~100 keV. The hard X-ray flux in the energy ra…
Solving the Discrepancy between the Extreme-Ultraviolet and Microwave Observations of the Quiet Sun
Landi, E.; Chiuderi Drago, F.
The aim of the present work is to understand the origin of the long-standing discrepancy between the EUV/UV-based predictions of the quiet-Sun microwave spectrum and the observed one. We compare accurate measurements of the quiet-Sun microwave brightness temperature (Tb) with theoretical calculations obtained by using the differential e…
Hα, Extreme-Ultraviolet, and Microwave Observations of the 2000 March 22 Solar Flare and Spontaneous Magnetic Reconnection
Gallagher, Peter T.; Choe, G. S.; Nita, Gelu M. +4 more
The evolution of a GOES class X1.1 solar flare, which occurred in NOAA Active Region 8910 on 2000 March 22, is discussed using observations from the Owens Valley Solar Array (OVSA), Big Bear Solar observatory (BBSO), Transition Region and Coronal Explorer (TRACE), and the Michelson Doppler Imager (MDI) on board Solar and Heliospheric Observatory (…
The Pulsar/White Dwarf/Planet System in M4: Improved Astrometry
Richer, Harvey B.; Ibata, Rodrigo; Fahlman, Gregory G. +1 more
A young and undermassive white dwarf has been identified as the possible companion to the millisecond pulsar PSR B1620-26 in M4. This association is important since it then helps constrain the mass of the third body in the system to be of order a few times that of Jupiter. The presence of this planet in M4 has critical implications for planetary f…