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Massive Elliptical Galaxies at High Redshift: NICMOS Imaging of z~1 Radio Galaxies
Dickinson, Mark; Dey, Arjun; Zirm, Andrew W.
We present deep, ~1.6 µm, continuum images of 11 high-redshift (0.811<z<1.875) 3CR radio galaxies observed with NICMOS on board the Hubble Space Telescope. Our NICMOS images probe the rest-frame optical light where stars are expected to dominate the galaxy luminosity. The rest-frame ultraviolet light of eight of these galaxies demonstr…
An XMM-Newton view of the extended ``filament'' near the cluster of galaxies Abell 85
Churazov, E.; Forman, W.; Durret, F. +1 more
We have observed with XMM-Newton the extended 4 Mpc filament detected by the ROSAT PSPC in the neighbourhood of the cluster of galaxies Abell 85. We confirm that there is an extended feature, aligned at the same position angle as the major axis of the central cD, the bright cluster galaxies, and nearby groups and clusters. We find that the X-ray e…
MHD tomography using interplanetary scintillation measurement
Hayashi, Keiji; Kojima, Masayoshi; Tokumaru, Munetoshi +1 more
The MHD tomography analysis, an advanced version of the computer-assisted tomography (CAT) analysis for interplanetary scintillation (IPS) observational data, is presented. When combined with a MHD simulation, the CAT analysis can reconstruct the MHD-based three-dimensional solar wind structure within 1 AU from the IPS line-of-sight integrated vel…
Galactic structure studies with BATC star counts
Zhou, Xu; Ma, Jun; Jiang, Zhaoji +6 more
We report the first results of star counts carried out with the National Astronomical Observatories (NAOC) 60/90 cm Schmidt Telescope in 15 intermediate-band filters from 3000 to 10 000 Å in the BATC survey. We analyze a sample of over 1400 main sequence stars (14<=Vle21 ), which lie in the field with central coordinates RA=09h53
Temporal Variation of Angular Momentum in the Solar Convection Zone
Howe, R.; Komm, R.; Hill, F. +1 more
We derive the angular momentum as a function of radius and time with the help of the rotation rates resulting from inversions of helioseismic data obtained from the Global Oscillation Network Group (GONG) and the Michelson Doppler Imager (MDI) and the density distribution from a model of the Sun. The base of the convection zone can be identified a…
Temperature variations from Hubble Space Telescope spectroscopy of the Orion Nebula
Martin, P. G.; Blagrave, K. P. M.; Dufour, R. J. +5 more
We present Hubble Space Telescope (HST)/STIS long-slit spectroscopy of NGC 1976. Our goal is to measure the intrinsic line ratio [OIII] 4364/5008 and thereby evaluate the electron temperature (Te) and the fractional mean-square Te variation (t2A)across the nebula. We also measure the intrinsic line ratio…
The Luminosity Function of the Large Magellanic Cloud Globular Cluster NGC 1866
Walker, A. R.; Castellani, V.; Brocato, E. +2 more
We present Hubble Space Telescope VI photometry of the central region of the Large Magellanic Cloud cluster NGC 1866, reaching magnitudes as faint as V=27. We find evidence that the cluster luminosity function shows a strong dependence on the distance from the cluster center, with a clear deficiency of low-luminosity stars in the inner region. We …
Chandra Observations of Expanding Shells in the Dwarf Starburst Galaxy NGC 3077
Martin, Crystal L.; Ott, Jürgen; Walter, Fabian
Deep Chandra observations (53 ks, ACIS-S3) of NGC 3077, a starburst dwarf galaxy in the M81 triplet, resolve the X-ray emission from several supershells. The emission is brightest in the cavities defined by expanding shells detected previously in Hα emission. Thermal emission models fitted to the data imply temperatures ranging from ~1.3 to 4.9×10…
The Long-Term Evolution of AR 7978: The Scalings of the Coronal Plasma Parameters with the Mean Photospheric Magnetic Field
Klimchuk, J. A.; Mandrini, C. H.; van Driel-Gesztelyi, L. +2 more
We analyze the evolution of the fluxes observed in X-rays and correlate them with the magnetic flux density in active region (AR) NOAA 7978 from its birth throughout its decay, for five solar rotations. We use Solar and Heliospheric Observatory Michelson Doppler Imager (MDI) data, together with Yohkoh Soft X-Ray Telescope (SXT) and Yohkoh Bragg Cr…
The eclipsing millisecond pulsar PSR J1740-5340 and its red straggler companion
van Kerkwijk, M. H.; Orosz, J. A.
We present a high-resolution echelle spectrum taken with the Very Large Telescope and analyse archival Hubble Space Telescope photometry of the recently identified companion of the eclipsing millisecond radio pulsar