4 papers · 1 filter
The Chandra High Energy Transmission Grating Spectrometer probes the dusty warm absorber in the Seyfert 1 galaxy MCG--6-30-15
J. C. Lee, C. R. Canizares, H. L. Marshall +4
The Chandra HETGS spectra of the Seyfert 1 galaxy MCG--6-30-15 show numerous narrow, unresolved (FWHM < 200 km/s) absorption lines from a wide range of ionization states of N, O, M…
Chandra--ASCA--RXTE observations of the micro-quasar GRS 1915+105
J. C. Lee, N. S. Schulz, C. S. Reynolds +2
A Chandra AO1 30ks HETGS observation of the X-ray transient micro-quasar GRS 1915+105 reveals absorption edges and faint line emission over the HETG energy range. We find from a pr…
The changing X-ray period of the Seyfert galaxy IRAS18325-5926
A. C. Fabian, J. C. Lee, W. N. Brandt +3
We report on two observations of the Seyfert galaxy IRAS18325-5926 made in 1997 December and 1998 February with the Rossi X-ray Timing Explorer (RXTE). We find evidence for periodi…
The Type Ia Supernova Rate at z ~ 0.4
R. Pain, I. Hook, S. Perlmutter +23
We present the first measurement of the rate of Type Ia supernovae at high redshift. The result is derived using a large subset of data from the Supernova Cosmology Project as desc…