Search Publications
Washington Photometry of the Red Giant Branch in NGC 6388
Wallerstein, George; Covarrubias, Ricardo; Hughes, Joanne +1 more
We present Washington photometry of the giant branches of the relatively metal-rich globular cluster NGC 6388 and compare it with 47 Tuc. By examining the spatial distribution of stellar colors across the red giant branch and using spectroscopic data on several bright giants, we found that NGC 6388's center is affected by differential reddening of…
High resolution γ-ray spectroscopy of flares on the east and west limbs of the Sun
Kiener, J.; Tatischeff, V.; Weidenspointner, G. +2 more
A new generation of Ge-based high-resolution gamma-ray spectrometers has allowed accurate measurements to be made of the profiles, widths and energies of the gamma-ray lines emitted in the impulsive phases of solar flares. Here we present measurements in two flares of the energies of the de-excitation lines of 12C and 16O at …
Energetic particles during the first and third Ulysses southern high-latitude excursions: Probing global corotating interaction region structure beyond 5 AU
Lario, D.; Roelof, E. C.
We analyze energetic particle observations during the first and third ascents of Ulysses to the southern regions of the heliosphere. The first high-latitude excursion occurred in the declining phase of solar cycle 22, while the third occurred in a later phase of solar cycle 23. In contrast to the long-lived and well-defined ~26-day recurrent inten…
Multispectral analysis of solar EUV images: linking temperature to morphology
Auchère, F.; Dudok de Wit, T.
Context: Solar images taken simultaneously at different wavelengths in the EUV are widely used for understanding structures such as flares, coronal holes, loops, etc. The line-of-sight integration and the finite spectral resolution of EUV telescopes, however, hinders interpretation of these individual images in terms of temperature bands. Traditio…
Narrow-line AGN in the ISO-2MASS survey
Cesarsky, C.; Siebenmorgen, R.; Haas, M. +9 more
Context: A long-standing challenge of observational AGN research is to find type 2 quasars, the luminous analogues of Seyfert-2 galaxies.
Aims: We search for luminous narrow-line type 2 AGN, characterise their properties, and compare them with broad-line type 1 AGN.
Methods: Combining the ISOCAM parallel survey at 6.7 µm with 2MASS, …
Near-infrared polarimetry and modelling of the dusty young planetary nebula IRAS 19306+1407
Gledhill, T. M.; Lowe, K. T. E.
We present near-infrared polarimetric images of the dusty circumstellar envelope (CSE) of IRAS 19306+1407, acquired at the United Kingdom Infrared Telescope (UKIRT) using the UKIRT 1-5 µm Imager Spectrometer (UIST) in conjunction with the half-waveplate module IRPOL2. We present additional 450- and 850-µm photometry data obtained with …
A 100 ks XMM-Newton view of the Seyfert 1.8 ESO 113-G010. Discovery of large X-ray variability and study of the Fe Kα line complex
Bianchi, S.; Grosso, N.; Uttley, P. +6 more
Context: The Seyfert 1.8 galaxy ESO 113-G010 had been observed for the first time above 2 keV by XMM-Newton during a short exposure (~4 ks) in May 2001. In addition to a significant soft X-ray excess, it showed one of the strongest (in EW) redshifted Fe Kα lines, at 5.4 keV.
Aims: We present here a long (100 ks) XMM-Newton follow-up of this so…
Highly significant detection of solar neutrons on 2005 September 7
Tanaka, Y. T.; Yoshikawa, I.; Mukai, T. +21 more
We have successfully detected solar neutrons at ground level in association with the X17.0 solar flare that occurred on 2005 September 7. Observations were made with the solar neutron telescopes and neutron monitors located in Bolivia and Mexico. In this flare, large fluxes of hard X-rays and γ-rays were observed by the GEOTAIL and the INTEGRAL sa…
Phase space holes and elementary radiation events
Pickett, J.; Pottelette, R.
Using high-time resolution measurements from the FAST and CLUSTER spacecraft we analyze different types of fine frequency structures of Auroral Kilometric Radiation (AKR). Based on the results from previous numerical simulations, we emphasize that the recorded frequency structures are the ones which are expected to occur on the low- and high-poten…
XMM-Newton view of galaxy pairs: activation of quiescent black holes?
Guainazzi, M.; Santos-Lleó, M.; Jiménez-Bailón, E. +4 more
We report on XMM-Newton observations of three nearby galaxy pairs, AM0707-273, AM1211-465, and AM2040-674. All six galaxies were previously classified as HII galaxies based on optical and IR spectroscopic analysis. All galaxies were detected with XMM-Newton and each member was isolated and analyzed independently. The X-ray spectra reveal strong ev…