Search Publications
The Circumstellar Environments of the Cool Hypergiants: Implications for the Mass Loss Mechanism
Humphreys, R. M.
The cool hypergiants are the most luminous known stars in the upper HR Diagram in the apparent temperature range represented by the spectral types A to M. Most of these stars in this regime are unstable as evidenced by their high mass loss rates, variability, and in some cases large IR excesses and circumstellar ejecta. In this brief paper, I desc…
The reddest ISO-2MASS quasar
Cesarsky, C.; Siebenmorgen, R.; Haas, M. +9 more
Context: While there is growing consensus on the existence of numerous dust-enshrouded red quasars, their discovery and detailed exploration is still an observational challenge. In the course of the near-mid-infrared AGN search combining the 6.7 µm ISOCAM Parallel Survey and 2MASS we have discovered 24 type-1 quasars about a third of which a…
Turbulent impulsive magnetic energy release from electron scale reconnection
Horton, W.; Kim, J. -H.; Militello, F. +1 more
Magnetic reconnection may occur as bursts of nonlinear plasma dynamics on the electron collisionless skin length scale de=c/ωpe, during which a large fraction of the magnetic energy is converted to plasma thermal energy and plasma flow energy. An example of such a bursty energy release event is given with a simple set of…
Energization of particles in Saturn's inner magnetosphere: Monte Carlo simulation of stochastic electric field effects
Durand-Manterola, H.; Martínez-Gómez, E.; Pérez, H.
Context: Our knowledge of energetic particles in Saturn's inner magnetosphere is based on observations made during the flybys of Pioneer 11, Voyager 1, Voyager 2, and recently by Cassini. The most important features of the energetic particle population in the inner Saturnian magnetosphere are: 1) the rings and the many large and small satellites i…
Quiet sun XUV and EUV spectroscopy
Lemaire, P.
The two XUV-EUV spectrometers on SOHO have collected a large amount of data in the 6000-10 6 K solar plasma temperature range. These data have allowed us to greatly enhance our knowledge of the processes acting in the solar atmosphere, from the chromosphere to the corona. Some results on the quiet Sun structure (network, quiet Sun versu…
Detection of CFIRB with AKARI/FIS deep observations
Nakagawa, Takao; Shirahata, Mai; Jeong, Woong-Seob +8 more
The Cosmic Far-Infrared Background (CFIRB) contains information about the number and distribution of contributing sources and thus gives us an important key to understand the evolution of galaxies. Using a confusion study to set a fundamental limit to the observations, we investigate the potential to explore the CFIRB with AKARI/FIS deep observati…
Multiwavelength observations of the two unidentified EGRET sources 3EG J0616-3310 and 3EG J1249-8330
Bignami, G. F.; Schirmer, M.; Hatziminaoglou, E. +3 more
We report on the X-ray and optical observation of the two unidentified EGRET sources 3EG J0616-3310 and 3EG J1249-8330. The X-ray coverage performed by the ESA space telescope XMM–Newton provided ∼150 X-ray sources within each of the two γ-ray error-circles. The optical follow-up carried on with the Wide Field Imager at the ESO/MPG 2.2 m telescope…
Ionized gas in starbursts: Case study of M82 and a note on NGC 1275
Gallagher, J. S.
Starbursts can be considered as galaxies where the normal self-regulation between the densities of young stars and the state of the ISM has broken down. This contribution briefly examines how intense modes of star formation influence the ISM, primarily as measured through properties of the warm ionized gas.
Solar X-ray and EUV corona and their relation to the magnetic activity
Benevolenskaya, Elena E.
We have studied the solar magnetic cycle in corona using X-ray data from YOHKOH and Extreme Ultraviolet data from SOHO/EIT. Soft X-ray data last the period from after the maximum cycle 22 to the maximum cycle 23 (1991-2001). The SOHO/EIT Extreme Ultraviolet data are used for the period from 1996 to 2003. These data provide us a unique opportunity …
An extension of the SHARC survey
Romer, A. K.; Adami, C.; Holden, B. P. +8 more
Aims:We report on our search for distant clusters of galaxies based on optical and X-ray follow up observations of X-ray candidates from the SHARC survey, and based on the assumption that the absence of bright optical or radio counterparts to possibly extended X-ray sources could mean that they are distant clusters.
Methods: We have obtained d…