Search Publications
Star Formation History of the Hubble Ultra Deep Field: Comparison with the Hubble Deep Field-North
Dickinson, Mark; Fan, Xiaohui; Thompson, Rodger I. +3 more
We use the NICMOS Treasury and ACS HUDF images to measure the extinction-corrected star formation history for 4681 galaxies in the region common to both images using the star formation rate distribution function and other techniques similar to those employed with the NICMOS and WFPC2 images in the HDFN. Unlike the HDFN, the NICMOS region of the HU…
Venus Express: Scientific goals, instrumentation, and scenario of the mission
Barabash, S.; Zhang, T. L.; Bertaux, J. -L. +23 more
The first European mission to Venus (Venus Express) is described. It is based on a repeated use of the Mars Express design with minor modifications dictated in the main by more severe thermal environment at Venus. The main scientific task of the mission is global exploration of the Venusian atmosphere, circumplanetary plasma, and the planet surfac…
Predictions of the electrical conductivity and charging of the aerosols in Titan's atmosphere
Tripathi, S.; Whitten, R. C.; Borucki, W. J. +2 more
The electrical conductivity and electrical charge on the aerosols in atmosphere of Titan are computed for altitudes between 0 and 400 km. Ionization of methane and nitrogen due to galactic cosmic rays (GCR) is important at night where these ions are converted to ion clusters such as CH +5CH 4, C 7H …
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…