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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…
Galaxy number counts - VI. An H-band survey of the Herschel Deep Field
McCracken, H. J.; Thompson, D.; Metcalfe, N. +3 more
We present H-band infrared (IR) galaxy data to a 3σ limit of H ~ 22.9 and optical-IR colours of galaxies on the William Herschel Deep Field (WHDF). These data were taken from a 7 × 7arcmin2 area observed for 14 h with the Ω Prime camera on the 3.5-m Calar Alto telescope. We also present counts derived from the Hubble Deep Field-South (H…
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…
Cassini observations of planetary-period oscillations of Saturn's magnetopause
André, N.; Lewis, G. R.; Coates, A. J. +8 more
Examination of Cassini magnetic field and plasma data in the outer boundary regions of Saturn's magnetosphere shows that magnetopause oscillations at the planetary period commonly occur, in phase with plasma pressure variations inside the magnetosphere. The peak-to-trough amplitude of the boundary oscillations mapped to the planet-Sun line is esti…
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…
Multiwavelength Study of Flow Fields in Flaring Super Active Region NOAA 10486
Xu, Yan; Cao, Wenda; Liu, Chang +5 more
We present high-resolution observations of horizontal flow fields measured by local correlation tracking from intensity images in three wavelengths, i.e., G band (GB), white light (WL), and near-infrared (NIR). The observations were obtained on 2003 October 29 within the flaring super active region NOAA 10486, which was the source of several X-cla…
A new population of planetary nebulae discovered in the Large Magellanic Cloud - I. Preliminary sample
Parker, Quentin A.; Reid, Warren. A.
We report our initial discovery of 73 new planetary nebulae (PNe) in the Large Magellanic Cloud (LMC) following confirmatory 2dF spectroscopy on the Anglo-Australian Telescope. Preliminary candidate sources come from a 10 per cent sub-area of our new deep, high-resolution Hα map of the central 25deg2 of the LMC obtained with the UK Schm…