Search Publications
Missions
Journals
Publication Years
Are Magnetic Dips Necessary for Prominence Formation?
Klimchuk, J. A.; MacNeice, P. J.; Antiochos, S. K. +2 more
The short answer: No.
The Disk and Environment of the Herbig Be Star HD 100546
Gull, T. R.; Moos, H. W.; Stecklum, B. +26 more
Coronagraphic imaging of the nearest Herbig Be star with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope, Ks (2.15 µm) imaging with ADONIS at the 3.6 m telescope at La Silla, and mid-infrared imaging with OSCIR using the 4 m Blanco Telescope at Cerro Tololo Inter-American Observatory confirm the detection …
Jet- and Wind-driven Ionized Outflows in the Superbubble and Star-forming Disk of NGC 3079
Filippenko, Alexei V.; Veilleux, Sylvain; Bland-Hawthorn, Joss +1 more
Hubble Space Telescope WFPC2 images are presented that span the inner ~19 kpc diameter of the edge-on galaxy NGC 3079; they are combined with optical, emission-line imaging spectrophotometry and VLA images of radio polarization vectors and rotation measures. Ionized gas filaments within 9 kpc diameter project up to 3 kpc above the disk, with the b…
The local axisymmetric instability criterion in a thin, rotating, multicomponent disc
Rafikov, R. R.
Purely gravitational perturbations are considered in a thin rotating disc composed of gas and several stellar components. The dispersion relation for the axisymmetric density waves propagating through the disc is found and the criterion for the local axisymmetric stability of the whole system is formulated. In the appropriate limit of two-componen…
Infrared to millimetre photometry of ultra-luminous IR galaxies: New evidence favouring a 3-stage dust model
Lemke, D.; Schulz, B.; Klaas, U. +7 more
Infrared to millimetre spectral energy distributions (SEDs) have been obtained for 41 bright ultra-luminous infrared galaxies (ULIRGs). The observations were carried out with ISOPHOT between 10 and 200 mu m and supplemented for 16 sources with JCMT/SCUBA at 450 and 850 mu m and with SEST at 1.3 mm. In addition, seven sources were observed at 1.2 a…
Clustering Segregation with Ultraviolet Luminosity in Lyman Break Galaxies at z~3 and Its Implications
Dickinson, Mark; Giavalisco, Mauro
We report on the clustering properties of Lyman break galaxies (LBGs) at z~3. The correlation length of flux-limited samples of LBGs depends on their rest-frame ultraviolet (UV) luminosity at λ~1700 Å, with fainter galaxies being less strongly clustered in space. We have used three samples with progressively fainter flux limits: two extracted from…
Magnetic Energy Release and Transients in the Solar Flare of 2000 July 14
Kosovichev, A. G.; Zharkova, V. V.
High-resolution observations of a large solar flare on 2000 July 14 (``Bastille Day Flare'') from the Michelson Doppler Imager instrument on the SOHO spacecraft reveal rapid variations of the magnetic field in the lower solar atmosphere during the flare. Some of these variations were irreversible, occurred in the vicinity of magnetic neutral lines…
The SuperCOSMOS Sky Survey - III. Astrometry
Hambly, N. C.; Irwin, M. J.; MacGillivray, H. T. +1 more
In this, the third in a series of three papers concerning the SuperCOSMOS Sky Survey, we describe the astrometric properties of the data base. We describe the algorithms employed in the derivation of the astrometric parameters of the data, and demonstrate their accuracies by comparison with external data sets using the first release of data, the S…
A Hipparcos study of the Hyades open cluster. Improved colour-absolute magnitude and Hertzsprung-Russell diagrams
de Bruijne, J. H. J.; de Zeeuw, P. T.; Hoogerwerf, R.
Hipparcos parallaxes fix distances to individual stars in the Hyades cluster with an accuracy of ~ 6 percent. We use the Hipparcos proper motions, which have a larger relative precision than the trigonometric parallaxes, to derive ~ 3 times more precise distance estimates, by assuming that all members share the same space motion. An investigation …
The mass of the neutron star in Vela X-1
Kaper, L.; Telting, J. H.; Barziv, O. +2 more
We measured the radial-velocity curve of HD 77581, the B-supergiant companion of the X-ray pulsar Vela X-1, using 183 high-resolution optical spectra obtained in a nine-month campaign. We derive radial-velocity amplitudes for different lines and wavelength regions, and find all are consistent with each other, as well as with values found in previo…