The X-ray observatory Suzaku (2007)
Mitsuda, Kazuhisa, Bautz, Mark, Inoue, Hajime, Kelley, Richard L., Koyama, Katsuji, Kunieda, Hideyo, ...
Leutenegger, Maurice A., Owocki, Stanley P., Kahn, Steven M., Paerels, Frits B. S.
We fit the Doppler profiles of the He-like triplet complexes of \ion{O}{7} and \ion{N}{6} in the X-ray spectrum of the O star $\zeta$ Puppis, using XMM-Newton RGS data collected over $\sim 400$ ks of...
X-ray Spectral Study of the Photoionized Stellar Wind in Vela~X-1 (2006)
Watanabe, Shin, Sako, Masao, Ishida, Manabu, Ishisaki, Yoshitaka, Kahn, Steven M., Kohmura, Takayoshi, ...
We present results from quantitative modeling and spectral analysis of the high mass X-ray binary Vela X-1 obtained with the Chandra HETGS. The spectra exhibit emission lines from H-like and He-like...
Measurements and analysis of helium-like triplet ratios in the X-ray spectra of O-type stars (2006)
Leutenegger, Maurice A., Paerels, Frits B. S., Kahn, Steven M., Cohen, David H.
We discuss new methods of measuring and interpreting the forbidden-to-intercombination line ratios of helium-like triplets in the X-ray spectra of O-type stars, including accounting for the spatial...
On the Putative Detection of z>0 X-ray Absorption Features in the Spectrum of Markarian 421 (2006)
Rasmussen, Andrew P., Kahn, Steven M., Paerels, Frits, Herder, Jan Willem Den, Kaastra, Jelle, De Vries, Cor
In a series of papers, Nicastro et al. have reported the detection of z>0 OVII absorption features in the spectrum of Mrk421 obtained with the Chandra Low Energy Transmission Grating Spectrometer...
Inner-shell Absorption Lines of Fe~VI-- Fe~XVI: A Many-body Perturbation Theory Approach (2005)
Gu, Ming F., Holczer, Tomer, Behar, Ehud, Kahn, Steven M.
We provide improved atomic calculation of wavelengths, oscillator strengths, and autoionization rates relevant to the $2\to 3$ inner-shell transitions of Fe~VI--XVI, the so-called Fe~M-shell...
Gu, Ming Feng, Schmidt, Mike, Beiersdorfer, Peter, Chen, Hui, Thorn, Daniel B., Träbert, Elmar, ...
We present high resolution laboratory spectra of K-shell X-ray lines from inner-shell excited and ionized ions of oxygen, obtained with a reflection grating spectrometer on the electron beam ion trap...
Resolving X-ray sources from B-stars spectroscopically: The example of mu Lep (2004)
Behar, Ehud, Leutenegger, Maurice, Doron, Rami, Guedel, Manuel, Feldman, Uri, Audard, Marc, ...
We present high-resolution X-ray observations of the chemically peculiar late-type B-star: mu Lep. However, we find spectroscopic and astrometric evidence, which show that the X-rays are not traced...
High Resolution X-ray Spectroscopic Constraints on Cooling-Flow Models (2003)
Peterson, John R., Kahn, Steven M., Paerels, Frits B. S., Kaastra, Jelle S., Tamura, Takayuki, Bleeker, Johan A. M., ...
We present XMM-Newton Reflection Grating Spectrometer observations of X-ray clusters and groups of galaxies. We demonstrate the failure of the standard cooling-flow model to describe the soft X-ray...
A Long Look at NGC 3783 with the XMM-Newton Reflection Grating Spectrometers (2003)
Behar, Ehud, Rasmussen, Andrew P., Blustin, Alexander J., Sako, Masao, Kahn, Steven M., Kaastra, Jelle S., ...
A long 280 ks observation of the Seyfert 1 galaxy NGC 3783 with XMM-Newton is reported. We focus on the oxygen line complex between 17 and 24 A as measured with the RGS spectrometers. Accurate...
X-Ray IGM in the Local Group (2003)
Rasmussen, Andrew, Kahn, Steven M., Paerels, Frits
Recent observations with the dispersive X-ray spectrometers aboard Chandra and Newton Observatory have begun to probe the properties of the X-ray intergalactic medium (IGM) at small redshifts. Using...
X-Ray Spectroscopy and Atomic Data (2002)
The Laboratory Astrophysics program employing the Lawrence Livermore National Laboratory (LLNL) Electron Beam Ion Trap (EBIT) has been providing useful atomic data in support of the x-ray missions...
X-ray spectroscopy of Eta Carinae with XMM-Newton (2002)
Leutenegger, Maurice A., Kahn, Steven M., Ramsay, Gavin
We present XMM-Newton observations of the luminous star Eta Carinae, including a high resolution soft X-ray spectrum of the surrounding nebula obtained with the Reflection Grating Spectrometer. The...
Soft X-ray Spectra of Seyfert 2 Galaxies (2002)
Sako, Masao, Kinkhabwala, Ali, Kahn, Steven M., Behar, Ehud, Paerels, Frits, Gu, Ming Feng, ...
High resolution spectroscopic observations of Seyfert galaxies with Chandra and XMM-Newton allows us to study the detailed ionization and thermal structures of the X-ray absorbing/emitting material...
Resolving the Effects of Resonant X-ray Line Scattering in Cen X-3 with Chandra (2002)
Wojdowski, Patrick S., Liedahl, Duane A., Sako, Masao, Kahn, Steven M., Paerels, Frederik
The massive X-ray binary Cen X-3 was observed over approximately one quarter of the system's 2.08 day orbit, beginning before eclipse and ending slightly after eclipse center with the Chandra X-ray...
Soft X-Ray Absorption by Fe$^{0+}$ to Fe$^{15+}$ in Active Galactic Nuclei (2001)
Behar, Ehud, Sako, Masao, Kahn, Steven M.
A full set of calculations is presented for inner-shell n = 2 to 3 photoexcitation of the 16 iron charge states: Fe I through Fe XVI. The blend of the numerous absorption lines arising from these...
Long-term Multi-wavelength Observations of GRS 1758-258 and the ADAF Model (2001)
Keck, John W., Craig, William W., Hailey, Charles J., Harrison, Fiona, Hong, Jae Sub, Kahn, Steven M., ...
We present a long-term multi-wavelength light curve of Galactic black hole candidate GRS 1758-258 by combining previously published and archival data from GRANAT, ROSAT, CGRO, RXTE, SAX, ASCA,...
High-Resolution X-Ray Spectroscopy of the Accretion Disk Corona Source 4U 1822-37 (2001)
Cottam, Jean, Sako, Masao, Kahn, Steven M., Paerels, Frits, Liedahl, Duane A.
We present a preliminary analysis of the X-ray spectrum of the accretion disk corona source, 4U 1822-37, obtained with the High Energy Transmission Grating Spectrometer onboard the Chandra X-ray...
Li, Yuexing, Gu, Ming F., Kahn, Steven M.
We derive a semi-analytic solution for the structure of conduction-mediated transition layers above an X-ray illuminated accretion disk, and calculate explicitly the X-ray line radiation resulting...
Sako, Masao, Kahn, Steven M., Paerels, Frits, Liedahl, Duane A.
We present a preliminary analysis of the first high-resolution X-ray spectrum of a Seyfert 2 galaxy, Mkn 3, obtained with the High Energy Transmission Grating Spectrometer onboard the Chandra X-ray...
Paerels, Frits, Brinkman, A. C., Kaastra, J. S., Kuulkers, E., ...
We find resolved interstellar O K, Ne K, and Fe L absorption spectra in the Chandra Low Energy Transmission Grating Spectrometer spectrum of the low mass X-ray binary X0614+091. We measure the column...
The Physical Conditions of the X-ray Emission Line Regions in the Circinus Galaxy (2000)
Sako, Masao, Kahn, Steven M., Paerels, Frits, Liedahl, Duane A.
We present a detailed X-ray spectral analysis of the Circinus Galaxy using archival data obtained with the ASCA satellite. The spectrum shows numerous emission lines in the soft X-ray band from...
The Chandra Iron-L X-Ray Line Spectrum of Capella (2000)
Behar, Ehud, Cottam, Jean, Kahn, Steven M.
An analysis of the iron L-shell emission in the publicly available spectrum of the Capella binary system, as obtained by the High Energy Transmission Grating Spectrometer on board the Chandra X-ray...
The X-Ray Spectrum and Global Structure of the Stellar Wind in Vela X-1 (1999)
Sako, Masao, Liedahl, Duane A., Kahn, Steven M., Paerels, Frits
We present a quantitative analysis of the X-ray spectrum of the eclipsing high mass X-ray binary Vela X-1 (4U 0900-40) using archival data from ASCA. The observation covers a time interval centered...
Towards an epistemology of consent /--by Steven M. Kahn. (1984)
Photocopy of typescript.