Search Publications
Hubble Space Telescope Advanced Camera for Surveys Observations of the z = 6.42 Quasar SDSS J1148+5251: A Leak in the Gunn-Peterson Trough
White, Richard L.; Strauss, Michael A.; Fan, Xiaohui +1 more
The Hubble Space Telescope Advanced Camera for Surveys has been used to obtain a narrowband image of the weak emission peak seen at λ=7205 Å in the Gunn-Peterson Lyβ absorption trough of the highest redshift quasar, SDSS J1148+5251. The emission looks perfectly pointlike; there is no evidence for the intervening galaxy that we previously suggested…
High-Spatial-Resolution Imaging Combining High-Order Adaptive Optics, Frame Selection, and Speckle Masking Reconstruction
Xu, Yan; Cao, Wenda; Yang, Guo +5 more
We present, for the first time, high-spatial-resolution observations combining high-order adaptive optics (AO), frame selection, and post-facto image correction via speckle masking. The data analysis is based on observations of solar active region NOAA 10486 taken with the Dunn Solar Telescope (DST) at the Sacramento Peak Observatory (SPO) of the …
Titan's stratospheric zonal wind, temperature, and ethane abundance a year prior to Huygens insertion
Sonnabend, G.; Kostiuk, T.; Murakawa, K. +7 more
Saturn's satellite, Titan, may have stratospheric winds up to ~210 m/s, circling Titan in ~1 terrestrial day compared to its 16-day rotation. Theoretical models explaining such super-rotating winds are not well constrained by observations of Titan or a similar slow rotator, Venus. We report measurements taken in December 2003 of zonal wind near Ti…
INTEGRAL observations of six AGN in the Galactic Plane
de Rosa, A.; Fabian, A. C.; Walter, R. +7 more
We present results on approximately one year of INTEGRAL observations of six AGN detected during the regular scans of the Galactic Plane. The sample is composed by five Seyfert 2 objects (MCG 05 23 16, NGC 4945, the Circinus galaxy, NGC 6300, ESO 103 G35) and the radio galaxy Centaurus A. The continuum emission of each of these sources is well rep…
New features of electron diffusion regions observed at subsolar magnetic field reconnection sites
Bale, S. D.; Torbert, R. B.; McFadden, J. P. +1 more
Nineteen electron diffusion regions at magnetic field reconnection sites have been found in one hour of Cluster satellite data near the subsolar magnetopause. Investigations on previously unachieved spatial and temporal scales show the following for the first time: direct conversion of magnetic energy to electron energy (The resulting accelerated …
Multispacecraft observations of the hard X-ray emission from the giant solar flare on 2003 November 4
Hurley, K.; Kane, S. R.; McTiernan, J. M.
The hard X-ray emission from the “giant” solar flare on 4 November 2003 ( 1947 UT) was observed by the hard X-ray/gamma ray spectrometer on the Ulysses spacecraft located at 114 degrees west of the Sun-Earth line at a distance of 5.28 AU from the Sun. A “small” hard X-ray burst during the early rise of the giant flare and a part of the decay of th…
Imaging Saturn's rings with CAMIRAS: thermal inertia of B and C rings
Pantin, E.; Lagage, P. O.; Ferrari, C. +2 more
Thermal inertias Γ of Saturn's B and C ring particles have been derived from infrared observations using the CAMIRAS camera mounted on the Canada-France-Hawaii Telescope. They are respectively Γ_B=5+18-2 {J m-2 K-1 s-1/2} and Γ_C=6+12-4 {J m-2 K-1 s<…
Jet-Gas Interaction in Markarian 78. II. Ionization Mechanisms
Silverman, J. D.; Wilson, A. S.; Rosario, D. J. +2 more
We investigate the ionization mechanisms in the Seyfert galaxy Markarian 78, chosen because its narrow-line region (NLR) is dominated by a strong jet-gas interaction. Our principal aim is to ascertain whether or not shock-related ionization is important. We use Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) optical and UV…
Dissecting the spiral galaxy M 83: mid-infrared emission and comparison with other tracers of star formation
Madden, S. C.; Sauvage, M.; Ehle, M. +4 more
We present a detailed mid-infrared study of the nearby, face-on spiral galaxy M 83 based on ISOCAM data. M 83 is a unique case study, since a wide variety of MIR broad-band filters as well as spectra, covering the wavelength range of 4 to 18 µm, were observed and are presented here. Emission maxima trace the nuclear and bulge area, star-form…
Far-infrared detection of methylene
Menten, K. M.; Baluteau, J. -P.; Polehampton, E. T. +2 more
We present a clear detection of CH2 in absorption towards the molecular cloud complexes