Search Publications
Modeling far-infrared line emission from the HII region S125
Emery, R. J.; Aannestad, P. A.
We present ISO-LWS spectral line observations of the [OI] 63 and 146 mu m lines, the [CII] 158 mu m line, and the [NII] 122 mu m line at 17 positions in the HII region S125. We model this emission by a two-dimensional geometrical blister model, utilizing the parameters derived from our previous modeling of the HII, HI and FIR dust emission in this…
Measurement of the Sunyaev-Zel'dovich increment in massive galaxy clusters
Halpern, Mark; Pierpaoli, Elena; Chapman, Scott +4 more
We have detected the Sunyaev-Zel'dovich (SZ) increment at 850 µm in two galaxy clusters (Cl 0016+16 and MS 1054.4-0321) using the Submillimetre Common User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. Fits to the isothermal β model yield a central Compton y parameter of (2.2 +/- 0.7) × 10-4 and a central 850-&micr…
Sunspot plume observations in the EUV. The gas pressure differential between the umbra and surrounding region
Doyle, J. G.; Madjarska, M. S.
The electron density over a bright sunspot plume region was evaluated using lines within the O V 760 Å multiplet. The plume showed an intensity enhancement factor of ~9 in the O V lines compared to regions outside the sunspot umbra. Internal agreement between the various ratios is excellent which would suggest that the O V lines do not suffer from…
Hot Dust in Radio-loud Active Galactic Nuclei
Haas, Martin; Siebenmorgen, Ralf; Freudling, Wolfram
We have measured mid-infrared (MIR) fluxes of 3C sources on images taken with ISOCAM on board the Infrared Space Observatory (ISO). The photometric data were combined with existing photometry at other wavelengths to assemble the spectral energy distribution (SED) for each galaxy from infrared to radio wavelengths. In addition, we used ISOPHOT spec…
ISO observations of the giant planets and Titan: what have we learnt?
Encrenaz, Thérèse
Infrared spectroscopic observations of the giant planets and Titan with the Infrared Space Observatory (ISO) have brought a significant contribution to our knowledge of these objects. The main discoveries achieved by ISO are: (1) the first detection of an external oxygen source for all giant planets and Titan; (2) the first detection of new strato…
The quest for hot gas in the halo of NGC 1511
Ehle, M.; Jansen, F.; Heckman, T. M. +3 more
XMM-Newton observations of the starburst galaxy NGC 1511 reveal the presence of a previously unknown extended hot gaseous phase of its ISM, which partly extends out of the disk plane. The emission distribution is asymmetric, being brightest in the eastern half of the galaxy, where also radio continuum observations suggest the highest level of star…
Photospheric and chromospheric oscillations in the base of coronal holes
Kobanov, N. I.; Makarchik, D. V.; Sklyar, A. A.
In this paper we carry out an analysis of the spatial-temporal line-of-sight velocity variations measured in the chromospheric (Hα, Hβ) and photospheric (Fei 6569 Å, Fei 4864 Å, Nii 4857 Å) lines at the base of 17 coronal holes. Time series of a duration from 43 to 120 min were recorded with the CCD line-array and the CCD matrix. Rather frequently…
INTEGRAL results on GRB 030320: A long gamma-ray burst detected at the edge of the field of view
Covino, S.; Götz, D.; Mereghetti, S. +9 more
GRB 030320 is the 5th gamma-ray burst (GRB) detected by INTEGRAL in the field of view (FoV). It is so far the GRB with the largest off-axis angle with respect to the INTEGRAL pointing direction, near to the edge of the FoV of both main instruments, IBIS and SPI. Nevertheless, it was possible to determine its position and to extract spectra and flu…
Cipher, A Polarimeter Telescope Concept for Hard X-Ray Astronomy
Stephen, J. B.; Caroli, E.; Curado da Silva, R. M. +1 more
The polarisation of astrophysical source emission in the energy range from a few tens of keV up to the MeV region is an almost unexplored field of high-energy astrophysics. Till date, polarimetry in astrophysics in the energy domain from hard X-rays up to soft γ-rays has not been pursued due to the difficulties involved in obtaining sufficient sen…
Discovery of a faint R-band drop-out: A strongly reddened lensed star forming galaxy at z = 1.68
Kneib, J. -P.; Schaerer, D.; Pelló, R. +2 more
We report the discovery of an unusual emission line galaxy at redshift z=1.68 found from near-IR imaging and spectroscopic observations with ISAAC/VLT of a faint gravitationally lensed R-band drop-out behind the lensing cluster Abell 1835. From the emission lines of [O II] lambda 3727i, and Hβ this galaxy shows a moderate to high excitation and li…