Search Publications
Star cluster formation and evolution in nearby starburst galaxies - II. Initial conditions
Bastian, N.; de Grijs, R.; Anders, P. +3 more
We use the ages, masses and metallicities of the rich young star cluster systems in the nearby starburst galaxies NGC 3310 and 6745 to derive their cluster formation histories and subsequent evolution. We further expand our analysis of the systematic uncertainties involved in the use of broad-band observations to derive these parameters (Paper I) …
A Hubble Space Telescope Survey of Extended [O III] λ5007 Å Emission in a Far-Infrared-Selected Sample of Seyfert Galaxies: Results
Pringle, J. E.; Hutchings, J. B.; Schmitt, H. R. +3 more
We present the results of a Hubble Space Telescope (HST) survey of extended [O III] emission in a sample of 60 nearby Seyfert galaxies (22 Seyfert 1's and 38 Seyfert 2's), selected by mostly isotropic properties. The comparison between the semimajor axis size of their [O III] emitting regions (Rmaj) shows that Seyfert 1's and Seyfert 2'…
Optical and Infrared Photometry of the Nearby Type Ia Supernova 2001el
Candia, Pablo; Krisciunas, Kevin; Phillips, Mark M. +8 more
We present well-sampled optical (UBVRI) and infrared (JHK) light curves of the nearby (~18.0 Mpc) Type Ia supernova SN 2001el, from 11 days before to 142 days after the time of B-band maximum. The data represent one of the best sets of optical and infrared photometry ever obtained for a Type Ia supernova (SN). Based on synthetic photometry using o…
Rapid Acceleration of a Coronal Mass Ejection in the Low Corona and Implications for Propagation
Gallagher, Peter T.; Dennis, Brian R.; Lawrence, Gareth R.
A high-velocity coronal mass ejection (CME) associated with the 2002 April 21 X1.5 flare is studied using a unique set of observations from the Transition Region and Coronal Explorer (TRACE), the Ultraviolet Coronagraph Spectrometer (UVCS), and the Large Angle and Spectroscopic Coronagraph (LASCO). The event is first observed as a rapid rise in GO…
Discovery of the Low-Redshift Optical Afterglow of GRB 011121 and Its Progenitor Supernova SN 2001ke
Infante, L.; Kirshner, R. P.; Garnavich, P. M. +10 more
We present the discovery and follow-up observations of the afterglow of the gamma-ray burst GRB 011121 and its associated supernova SN 2001ke. Images were obtained with the Optical Gravitational Lensing Experiment 1.3 m telescope in BVRI passbands, starting 10.3 hr after the burst. The temporal analysis of our early data indicates a steep decay, i…
Evidence of a high-velocity ionized outflow in a second narrow-line quasar PG 0844+349
O'Brien, P. T.; King, A. R.; Page, K. L. +1 more
Following the discovery of X-ray absorption in a high-velocity outflow from the bright quasar PG 1211 + 143 we have searched for similar features in XMM-Newton archival data of a second (high accretion rate) quasar PG 0844+349. Evidence is found for several faint absorption lines in both the EPIC and RGS spectra, whose most likely identification w…
The ISO view of Palomar-Green quasars
Meisenheimer, K.; Krause, O.; Lemke, D. +8 more
Mining the ISO data archive we provide the complete ISO view of PG quasars containing 64 infrared spectral energy distributions between 5 and 200 mu m. About half of the sample was supplemented by MAMBO and SCUBA (sub-)millimetre data. Since the PG quasars were selected optically, the high infrared detection rate of more than 80% suggests that eve…
An XMM-Newton hard X-ray survey of ultraluminous infrared galaxies
Cappi, M.; Franceschini, A.; Bassani, L. +8 more
XMM-Newton observations of 10 ultraluminous infrared galaxies (ULIRGs) from a 200-ks mini-survey programme are reported. The aim is to investigate in hard X-rays a complete ULIRG sample selected from the bright IRAS 60-µm catalogue. All sources are detected in X-rays, five of which for the first time. These observations confirm that ULIRGs a…
Circumnuclear Dust in Nearby Active and Inactive Galaxies. II. Bars, Nuclear Spirals, and the Fueling of Active Galactic Nuclei
Pogge, Richard W.; Mulchaey, John S.; Martini, Paul +1 more
We present a detailed study of the relation between circumnuclear dust morphology, host-galaxy properties, and nuclear activity in nearby galaxies. We use our sample of 123 nearby galaxies with visible-near-infrared color maps from the Hubble Space Telescope to create well-matched, ``paired'' samples of 28 active and 28 inactive galaxies, as well …
Hubble Space Telescope ACS Coronagraphic Imaging of the Circumstellar Disk around HD 141569A
Ford, H. C.; Infante, L.; Zheng, W. +31 more
Multicolor coronagraphic images of the circumstellar disk around HD 141569A have been obtained with the Hubble Space Telescope Advanced Camera for Surveys. The B, V, and I images show that the disk's previously described multiple-ring structure is actually a continuous distribution of dust with a tightly wound spiral structure. Extending from the …