Search Publications
26Al in the inner Galaxy. Large-scale spectral characteristics derived with SPI/INTEGRAL
Wang, W.; Strong, A. W.; Knödlseder, J. +12 more
Aims.We performed a spectroscopic study of the 1809 keV gamma-ray line from 26Al decay in the Galaxy using the SPI imaging spectrometer with its high-resolution Ge detector camera on the INTEGRAL observatory. Methods.We analyzed observations of the first two mission years, fitting spectra from all 7130 telescope pointings in narrow ener…
Observations in the Saturn system during approach and orbital insertion, with Cassini's visual and infrared mapping spectrometer (VIMS)
Sotin, C.; Brown, R. H.; Baines, K. H. +23 more
The Visual and Infrared Mapping Spectrometer observed Phoebe, Iapetus, Titan and Saturn's rings during Cassini's approach and orbital insertion. Phoebe's surface contains water ice, CO{2}, and ferrous iron. Iapetus contains CO{2} and organic materials. Titan's atmosphere shows methane fluorescence, and night-side atmospheric emission that may be C…
Using the ROSAT catalogues to find counterparts for the second IBIS/ISGRI survey sources
Walter, R.; Bird, A. J.; Ubertini, P. +6 more
The second IBIS/ISGRI survey has produced a catalogue containing 209 hard X-ray sources visible down to a flux limit of around 1 milliCrab. The point source location accuracy of typically 1-3 arcmin has allowed the counterparts for most of these sources to be found at other wavelengths. In order to help identify the remaining objects, we have used…
High-resolution millimeter-interferometer observations of the solar chromosphere
Solanki, S. K.; White, S. M.; Loukitcheva, M.
The use of millimeter-interferometer data for the study of chromospheric structure and dynamics is tested using 85 GHz observations with the 10-element Berkeley-Illinois-Maryland Array (BIMA). Interferometer data have the advantage over single-dish data that they allow both high spatial resolution and dense temporal sampling simultaneously. Howeve…
Discovery of PAHs in the halo of NGC 5907
Madden, S. C.; Irwin, J. A.
We have used sensitive archival data from the Infrared Space Observatory (ISO) to make maps of the edge-on low SFR galaxy, NGC 5907, in 6 different MIR bands: LW2, LW5, LW6, LW7, LW8, and LW10, covering the spectrum from 6.5 to 15.0 µm and including several narrow bands that isolate the infrared aromatic spectral features commonly referred t…
XMM-Newton observations of SN 1987 A
Haberl, F.; Hasinger, G.; Aschenbach, B. +1 more
Context: .We report on XMM-Newton observations of SN 1987 A in the Large Magellanic Cloud.
Aims: .The large collecting area telescopes together with the European Photon Imaging Cameras (EPIC) provide X-ray spectra with unprecedented statistical quality and make it possible to investigate the spectral evolution during the brightening observed s…
Quasars near the line of sight towards Q 0302-003 and the transverse proximity effect
Worseck, G.; Wisotzki, L.
We report the discovery of the faint (V≃ 21.7) quasar QSO 03027-0010 at z=2.808 in the vicinity of Q 0302-003, one of the few quasars observed with STIS to study intergalactic He II absorption. Together with another newly discovered QSO at z=2.29, there are now 6 QSOs known near the line of sight towards Q 0302-003, of which 4 are located within t…
Active galactic nuclei in the mid-IR. Evolution and contribution to the cosmic infrared background
Pozzi, F.; Gruppioni, C.; Zamorani, G. +3 more
Aims.We study the evolution of the luminosity function (LF) of type-1 and type-2 Active Galactic Nuclei (AGN) in the mid-infrared, derive the contribution of the AGN to the Cosmic InfraRed Background (CIRB) and the expected source counts to be observed by Spitzer at 24 µm. Methods: We used a sample of type-1 and type-2 AGN selected at 15 &mi…
Observations of a soft X-ray rising loop associated with a type II burst and a coronal mass ejection in the 03 November 2003 X-ray flare
Krucker, S.; Vilmer, N.; Dauphin, C.
Context: .We report observations of a type II burst - the signature of a shock wave - starting at the unusual high frequency of 650 MHz during the 03 November 2003 flare. This flare is associated with the propagation of a soft X-ray coronal loop and with a coronal mass ejection (CME).
Aims: .We study in this paper the origin of the shock wave …
3D spectroscopy with VLT/GIRAFFE. II. Are luminous compact galaxies merger remnants?
Östlin, G.; Flores, H.; Hammer, F. +2 more
Luminous Compact Galaxies (LCGs) are enigmatic sources in many aspects. They can reach the luminosity of the Milky Way within a radius of only a few kpc. They also represent one of the most rapidly evolving populations of galaxies since they represent up to 1/5 of the luminous galaxies at redshift z= 0.7, while being almost absent in the local Uni…