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An XMM-Newton observation of the massive, relaxed galaxy cluster ClJ1226.9+3332 at z= 0.89
Maughan, B. J.; Ebeling, H.; Jones, L. R. +1 more
A detailed X-ray analysis of an XMM-Newton observation of the high-redshift (z= 0.89) galaxy cluster ClJ1226.9+3332 is presented. After careful consideration of background subtraction issues, the X-ray temperature is found to be 11.5+1.1-0.9 keV, the highest X-ray temperature of any cluster at z > 0.6. The temperature is c…
Walén and slow-mode shock analyses in the near-Earth magnetotail in connection with a substorm onset on 27 August 2001
Balogh, A.; RèMe, H.; Vaivads, A. +6 more
We have examined Cluster spacecraft 1 (C1) magnetic field and particle observations from 27 August 2001 when the Cluster spacecraft separation was less than 0.27 RE and the spacecraft were located near the equatorial plane of the postmidnight magnetotail at xGSM ∼ -19 RE and yGSM ∼ -2.1 RE. A …
HD 108: The mystery deepens with XMM-Newton observations
Nazé, Y.; Rauw, G.; Vreux, J. -M. +1 more
In 2001, using a large spectroscopic dataset from an extensive monitoring campaign, we discovered that the peculiar Of star HD 108 displayed extreme line variations. This strange behaviour could be attributed to a variety of models, and an investigation of the high energy properties of HD 108 was needed to test the predictions from these models. O…
The Ages of Dwarf Elliptical Galaxies
Schombert, James; Rakos, Karl
We present narrowband photometry of 91 dwarf elliptical galaxies in the Coma and Fornax Clusters taken with the Strömgren (uvby) filter system. Dividing the sample by dwarf morphology into nucleated (dEN) and nonnucleated (dE) dwarfs reveals two distinct populations of early-type systems based on integrated colors. The class of dEN galaxies are re…
Solar Irradiance Variations: From Current Measurements to Long-Term Estimates
Solanki, Sami K.; Krivova, Natalie A.
Variations of solar total and spectral irradiance are prime solar quantities purported to have an influence on the Earth's climate. Quantitative estimates of irradiance over as long a time as possible are needed to judge their effectiveness in forcing the climate. In order to do this reliably, first the measured record must be reproduced and a fee…
Total solar irradiance observations from DIARAD/VIRGO
Dewitte, S.; Crommelynck, D.; Joukoff, A.
The Differential Absolute Radiometer is making measurements of the total solar irradiance as part of the Variability of Irradiance and Gravity Oscillations experiment on the Solar and Heliospheric Observatory. We present the measurements made during its 7.8 years of operation, from 1996 until the present (2003). The aging due to UV exposure of the…
Magnetic Field, Hα, and RHESSI Observations of the 2002 July 23 Gamma-Ray Flare
Krucker, Säm; Wang, Haimin; Yurchyshyn, Vasyl +2 more
In this paper we examine two aspects of the 2002 July 23 gamma-ray flare by using multiwavelength observations. First, the data suggest that the interaction of the erupted field with an overlying large-scale coronal field can explain the offset between the gamma-ray and the hard X-ray sources observed in this event. Second, we pay attention to rap…
Discovery of the optical counterpart to the X-ray pulsar SAX J2103.5+4545
Reig, P.; Negueruela, I.; Fabregat, J. +3 more
We report optical and infrared photometric and spectroscopic observations that identify the counterpart to the 358.6-s X-ray transient pulsar
Long-term evolution of FU Orionis objects at infrared wavelengths
Prusti, T.; Csizmadia, Sz.; Ábrahám, P. +3 more
We investigate the brightness evolution of seven FU Orionis systems in the 1-100 µm wavelength range using data from the Infrared Space Observatory (ISO). The ISO measurements were supplemented by 2MASS and MSX observations performed in the same years as the ISO mission (1995-98). The spectral energy distributions (SEDs) based on these data …
Collisional evolution of the asteroid belt
Cheng, Andrew F.
A new synthesis of asteroid collisional evolution is motivated by the question of whether most asteroids larger than ∼1 km size are strengthless gravitational aggregates (rubble piles). NEAR found Eros not to be a rubble pile, but a shattered collisional fragment, with a through-going fracture system, and an average of about 20 m regolith cover. O…