Search Publications
Incidence and survival of remnant disks around main-sequence stars
Kessler, M. F.; Siebenmorgen, R.; Bouchet, P. +8 more
We present photometric ISO 60 and 170 µm measurements, complemented by some IRAS data at 60 µm, of a sample of 84 nearby main-sequence stars of spectral class A, F, G and K in order to determine the incidence of dust disks around such main-sequence stars. Fifty stars were detected at 60 µm. 36 of these emit a flux expected from t…
Searching for the Physical Drivers of the Eigenvector 1 Correlation Space
Marziani, P.; Zwitter, T.; Sulentic, J. W. +2 more
We recently discussed an Eigenvector 1 (E1) parameter space that provides optimal discrimination between the principal classes of broad-line active galactic nuclei (AGNs). In this paper we begin a search for the most important physical parameters that are likely to govern correlations and data point distribution in E1 space. We focus on the princi…
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…