Nitrogen K-shell photoabsorption (2009)
Garcia, J., Kallman, T. R., Witthoeft, M., Behar, E., Mendoza, C., Palmeri, P., ...
Reliable atomic data have been computed for the spectral modeling of the nitrogen K lines, which may lead to useful astrophysical diagnostics. Data sets comprise valence and K-vacancy level energies,...
A Compton-thick Wind in the High Luminosity Quasar, PDS 456 (2009)
Reeves, J. N., O'Brien, P. T., Braito, V., Behar, E., Miller, L., Turner, T. J., ...
PDS 456 is a nearby (z=0.184), luminous (L_bol ~10^47 erg/s) type I quasar. A deep 190 ks Suzaku observation in February 2007 revealed the complex, broad band X-ray spectrum of PDS 456. The Suzaku...
Reducing anxiety sensitivity with exercise (2008)
Smits, J.A.J., Berry, A.C., Rosenfield, D., Powers, M.B., Behar, E., Otto, M.W.
Background: Exercise interventions repeatedly have been shown to be efficacious for the treatment of depression, and initial studies indicate similar efficacy for the treatment of anxiety conditions....
Abundance variations and first ionization potential trends during large stellar flares (2007)
The Solar First Ionization Potential (FIP) effect, where low-FIP elements are enriched in the corona relative to the photosphere, while high-FIP abundances remain unchanged, has been known for a long...
Costantini, E., Kaastra, J. A., Arav, N., Kriss, G. A., Steenbrugge, K. C., Gabel, J. R., ...
We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. This observation was carried out simultaneously with HST-STIS and FUSE, in the context of a multi-wavelength study of this...
The mass-energy budget of the ionised outflow in NGC 7469 (2007)
Blustin, A. J., Kriss, G. A., Holczer, T., Behar, E., Kaastra, J. S., Page, M. J., ...
Although AGN feedback through ionised winds is of great importance in models of AGN/galaxy coevolution, the mass and energy output via these winds, even in the nearby universe, is poorly understood....
Six Large Coronal X-ray Flares Observed With Chandra (2006)
A study of the six largest coronal X-ray flares in the Chandra archive is presented. The flares were observed on II Peg, OU And, Algol, HR 1099, TZ CrB and CC Eri, all with the High Energy...
Constantini, E., Kaastra, J.S., Arav, N., Kriss, G.A., Steenbrugge, K.C., Gabel, J.R., ...
We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. This observation was carried out simultaneously with HST-STIS and FUSE, in the context of a multiwavelength study of this...
Costantini, E., Kaastra, J. S., Arav, N., Kriss, G. A., Steenbrugge, K. C., Gabel, J. R., ...
We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. This observation was carried out simultaneously with HST-STIS and FUSE, in the context of a multiwavelength study of this...
Emission Measure Distribution and Abundances Measurements During High-T Flares (2005)
Nordon, R., Behar, E., Guedel, M.
The RSCVn system Sigma Geminorum was observed by XMM-Newton on April 2001 during a large flare. We model the emission measure distribution (EMD) during the flare and during a quiescence period. In...
Principal component analysis of the X-ray variability in NGC 7469 (2005)
Blustin, A. J., Fuerst, S. V., Branduardi-Raymont, G., Page, M. J., Behar, E., Kaastra, J. S.
We apply Principal Component Analysis (PCA) to study the variability of the X-ray continuum in the Seyfert 1 galaxy NGC 7469. The PCA technique is used to separate out linear components contributing...
On Temperature and Abundance Effects During an X-Ray Flare on Sigma Geminorum (2005)
Nordon, R., Behar, E., Guedel, M.
We compare quiescent and flare X-ray spectra of the RS CVn binary Sigma Gem obtained with the Chandra and XMM-Newton grating spectrometers. We find that in addition to an overall 25% flux increase,...
XMM-Newton observations of the heavily absorbed Seyfert 1 galaxy IC 4329A (2004)
Steenbrugge, K. C., Kaastra, J. S., Sako, M., Branduardi-Raymont, G., Behar, E., Paerels, F. B. S., ...
We detect seven distinct absorbing systems in the high-resolution X-ray spectrum of the Seyfert 1 galaxy IC 4329A, taken with XMM-Newton. Firstly we detect absorption due to cold gas in our own...
Flare and quiescent X-ray emission from Sigma Geminorum (2004)
Nordon, R., Behar, E., Guedel, M.
The X-ray active RS CVn binary system Sigma Geminorum was observed during a long-duration flare with XMM-Newton. We compare line emission during the flare with line emission measured from a previous...
Kaastra, J. S., Raassen, A. J. J., Mewe, R., Arav, N., Behar, E., Gabell, J. R., ...
One of the main problems in modeling the ionised outflows in Active Galactic Nuclei is the unknown distance of the outflowing wind to the central source. Only if the density is known this distance...
Kaastra, J.S., Raassen, A.J.J., Mewe, R., Arav, N., Behar, E., Costantini, E., ...
One of the main problems in modeling the ionised outflows in Active Galactic Nuclei is the unknown distance of the outflowing wind to the central source. Only if the density is known this distance...
Netzer, H., Kaspi, S., Behar, E., Brandt, W. N., Chelouche, D., George, I. M., ...
We present a detailed spectral analysis of the data obtained from NGC 3783 during the period 2000-2001 using Chandra. This analysis leads us to the following results. 1) NGC 3783 fluctuated in...
Assessment of the fluorescence and auger database used in plasma modeling (2003)
Gorczyca, T. W., Kodituwakku, C. N., Korista, K. T., Zatsarinny, O., Badnell, N. R.*, Behar, E., ...
We have investigated the accuracy of the vacancy fluorescence database of Kaastra & Mewe resulting from the initial atomic physics calculations and the subsequent scaling along isoelectronic...
Assessment of the fluorescence and auger database used in plasma modeling (2003)
Gorczyca, T.W., Kodituwakku, C.N., Korista, K.T., Zatsarinny, O., Badnell, N.R., Behar, E., ...
We have investigated the accuracy of the vacancy fluorescence database of Kaastra & Mewe resulting from the initial atomic physics calculations and the subsequent scaling along isoelectronic...
Assessment of the fluorescence and auger database used in plasma modeling (2003)
Gorczyca, T.W., Kodituwakku, C.N., Korista, K.T., Zatsarinny, O., Badnell, N.R., Behar, E., ...
We have investigated the accuracy of the vacancy fluorescence database of Kaastra & Mewe resulting from the initial atomic physics calculations and the subsequent scaling along isoelectronic...
Chandra LETGS and XMM-Newton observations of NGC 4593 (2003)
Steenbrugge, K. C., Kaastra, J. S., Blustin, A. J., Branduardi-Raymont, G., Sako, M., Behar, E., ...
In this paper, we analyze spectra of the Seyfert 1 galaxy NGC 4593 obtained with the Chandra Low Energy Transmission Grating Spectrometer (LETGS), the Reflection Grating Spectrometer (RGS) and the...
Kinkhabwala, A., Behar, E., Sako, M., Gu, M. F., Kahn, S. M., Paerels, F. B. S.
We present a detailed model of the discrete X-ray spectroscopic features expected from steady-state, low-density photoionized plasmas. We apply the Flexible Atomic Code (FAC) to calculate all of the...
Assessment of the Fluorescence and Auger Data Base used in Plasma Modeling (2003)
Gorczyca, T. W., Kodituwakku, C. N., Korista, K. T., Zatsarinny, O., Badnell, N. R., Behar, E., ...
We have investigated the accuracy of the 1s-vacancy fluorescence data base of Kaastra & Mewe (1993, A&AS, 97, 443) resulting from the initial atomic physics calculations and the subsequent scaling...
Blustin, A. J., Branduardi-Raymont, G., Behar, E., Kaastra, J. S., Kriss, G. A., Page, M. J., ...
We present an XMM-Newton observation of NGC 7469, including studies of the X-ray and UV variability, 0.2-10 keV spectral continuum, Fe K-alpha emission line and the first-ever high-resolution X-ray...
Mason, K.O., Branduardi-Raymont, G., Ogle, P.M., Page, M.J., Puchnarewicz, E.M., Behar, E., ...
Competing models for broad spectral features in the soft X-ray spectrum of the Seyfert I galaxy Mrk 766 are tested against data from a 130 ks XMM-Newton observation. A model including...
Performance and results of the reflection grating spectrometers onboard XMM-Newton (2003)
Herder, J.W. Den, Brinkman, A.C., Kahn, S.M., Branduardi-Raymont, G., Audard, M., Behar, E., ...
The Soft X-ray Spectrum from NGC 1068 Observed with LETGS on Chandra (2002)
Brinkman, A. C., Kaastra, J. S., Kinkhabwala, A., Behar, E., Kahn, S. M., ...
Using the combined spectral and spatial resolving power of the Low Energy Transmission Grating (LETGS) on board Chandra, we obtain separate spectra from the bright central source of NGC 1068 (Primary...
Mason, K. O., Branduardi-Raymont, G., Ogle, P. M., Page, M. J., Puchnarewicz, E. M., Behar, E., ...
Competing models for broad spectral features in the soft X-ray spectrum of the Seyfert I galaxy Mrk766 are tested against data from a 130 ks XMM-Newton observation. A model including relativistically...
Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton (2002)
Blustin, A.J., Branduardi-Raymont, G., Behar, E., Kaastra, J.S., Kahn, S.M., Page, M.J., ...
We present the analysis of multi-wavelength XMM-Newton data from the Seyfert galaxy NGC 3783, including UV imaging, X-ray and UV lightcurves, the 0.2-10 keV X-ray continuum, the iron K-alpha emission...
Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton (2002)
Blustin, A J, Branduardi-Raymont, G, Behar, E, Kaastra, J S, Kahn, S M, Page, M J, ...
We present the analysis of multi-wavelength XMM-Newton data from the Seyfert galaxy NGC 3783, including UV imaging, X-ray and UV lightcurves, the 0.2-10 keV X-ray continuum, the iron K-alpha emission...
Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton (2002)
Blustin, A. J., Branduardi-Raymont, G., Behar, E., Kaastra, J. S., Kahn, S. M., Page, M. J., ...
We present the analysis of multi-wavelength XMM-Newton data from the Seyfert galaxy NGC 3783, including UV imaging, X-ray and UV lightcurves, the 0.2-10 keV X-ray continuum, the iron K-alpha emission...
Guedel, M., Audard, M., Smith, K. W., Behar, E., Beasley, A. J., Mewe, R.
The RS CVn-type binary $\sigma$ Geminorum was observed during a large, long-duration flare simultaneously with {\it XMM-Newton} and the VLA. The light curves show a characteristic time dependence...
High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton (2002)
Raassen, A. J. J., Mewe, R., Audard, M., Guedel, M., Behar, E., Kaastra, J. S., ...
We report the analysis of the high-resolution soft X-ray spectrum of the nearby F-type star Procyon in the wavelength range from 5 to 175 Angstrom obtained with the Low Energy Transmission Grating...
Kinkhabwala, A., Sako, M., Behar, E., Kahn, S. M., Paerels, F., Brinkman, A. C., ...
We present the first high-resolution, soft-X-ray spectrum of the prototypical Seyfert 2 galaxy, NGC 1068. This spectrum was obtained with the XMM-Newton Reflection Grating Spectrometer. Emission...
High-Resolution X-ray imaging and spectroscopy of SNR N103B (2002)
Van Der Heyden, K. J., Behar, E., Vink, J., Rasmussen, A. P., Kaastra, J. S., Bleeker, J. A. M., ...
The X-ray emission from the young supernova remnant (SNR) N103B is measured and analysed using the high-resolution cameras and spectrometers on board XMMM and CHANDRA. The spectrum from the entire...
Soft X-ray Spectroscopy of NGC 1068 with XMM-Newton RGS and Chandra LETGS (2002)
Kinkhabwala, A., Sako, M., Behar, E., Kahn, S. M., Paerels, F., Brinkman, A. C., ...
We present high-resolution soft-X-ray spectra of the prototypical Seyfert 2 galaxy, NGC 1068, taken with XMM-Newton RGS and Chandra LETGS. Its rich emission-line spectrum is dominated by...
X-ray spectroscopy of NGC 5548 (2002)
Kaastra, J. S., Steenbrugge, K. C., Raassen, A. J. J., Brinkman, A. C., Liedahl, D. A., ...
We analyze the high-resolution X-ray spectrum of the Seyfert 1 galaxy NGC 5548, for the full 0.1-10 keV band, using improved calibration results of the Chandra-LETGS instrument. The warm absorber...
Savin,D. W., Behar,E., Kahn,S. M., Gwinner,G., Saghiri,A. A., Schmitt,M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 --> N' = 2 (DeltaN = 0) core excitations. We have also calculated the DR...
Savin, D.W., Behar, E., Kahn, S.M., Gwinner, G., Saghiri, A.A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 → N′ = 2 (N = 0) core excitations. We have also calculated the DR...
Savin, D.W., Behar, E., Kahn, S.M., Gwinner, G., Saghiri, A.A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 → N′ = 2 (N = 0) core excitations. We have also calculated the DR...
Savin, D.W., Behar, E., Kahn, S.M., Gwinner, G., Saghiri, A.A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 → N′ = 2 (N = 0) core excitations. We have also calculated the DR...
XMM-Newton probes the solar past: Coronal abundances of solar analogs at different ages (2002)
Gudel, M., Audard, M., Sres, A., Wehrli, R., Behar, E., Mewe, R., ...
A Study of the Coronal Plasma in RS CVn binary systems: HR1099 and co. (2002)
Audard, M., Gudel, M., Sres, A., Mewe, R., Raassen, A.J.J., Behar, E., ...
X-ray spectroscopy of NGC 5548 (2002)
Kaastra, J.S., Steenbrugge, K.C., Raassen, A.J.J., Brinkman, A.C., Liedahl, D.A., ...
High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton (2002)
Raassen, A.J.J., Mewe, R., Audard, M., Gudel, M., Behar, E., Kaastra, J.S., ...
Savin, D. W., Behar, E., Kahn, S. M., Gwinner, G., Saghiri, A. A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 --> N' = 2 (DeltaN = 0) core excitations. We have also calculated the DR...
R. Mewe, M. Audard, M. Güdel, E. Behar, J. S. Kaastra, ...
Abstract. We report the analysis of the high-resolution soft X-ray spectrum of the nearby F-type star Procyon in the wavelength range from 5 to 175 ˚A obtained with the Low Energy Transmission...
Can a Dusty Warm Absorber Model Reproduce the Soft X-ray Spectra of MCG-6-30-15 and Mrk 766? (2001)
Sako, M., Kahn, S. M., Branduardi-Raymont, G., Kaastra, J. S., Brinkman, A. C., Page, M. J., ...
XMM-Newton RGS spectra of MCG-6-30-15 and Mrk 766 exhibit complex discrete structure, which was interpreted in a paper by Branduardi-Raymont et al. (2001) as evidence for the existence of...
Xu, H., Kahn, S. M., Peterson, J. R., Behar, E., Paerels, F. B. S., Mushotzky, R. F., ...
We present the first high spectral resolution X-ray observation of the giant elliptical galaxy NGC 4636, obtained with the Reflection Grating Spectrometer on-board the XMM-Newton Observatory. The...
A Study of the Coronal Plasma in RS CVn binary systems: HR 1099 and co (2001)
Audard, M., Guedel, M., Sres, A., Mewe, R., Raassen, A. J. J., Behar, E., ...
XMM-Newton has been performing comprehensive studies of X-ray luminous RS CVn binary systems in its calibration and guaranteed time programs. We present results from ongoing investigations in the...
XMM-Newton Probes the Solar Past: Coronal Abundances of Solar Analogs at Different Ages (2001)
Guedel, M., Audard, M., Sres, A., Wehrli, R., Behar, E., Mewe, R., ...
We present an X-ray spectral analysis of four solar analogs with different ages and magnetic activity levels. We find largely different coronal compositions. The most active stars tend to show an...
A Systematic Spectroscopic X-Ray Study of Stellar Coronae with XMM-Newton: Early Results (2001)
Guedel, M., Audard, M., Smith, K. W., Sres, A., Escoda, C., Wehrli, R., ...
We have been conducting a comprehensive survey of stellar coronae with the XMM-Newton Reflection Grating Spectrometers during the commissioning, calibration, verification, and guaranteed time phases...
A Study of the Coronal Plasma in RS CVn binary systems (2001)
Audard, M., Guedel, M., Sres, A., Mewe, R., Raassen, A. J. J., Behar, E., ...
XMM-Newton has been performing comprehensive studies of X-ray bright RS CVn binaries in its Calibration and Guaranteed Time programs. We present results from ongoing investigations in the context of...
Savin, D. W., Behar, E., Kahn, S. M., Gwinner, G., Saghiri, A. A., Schmitt, M., ...
We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N=2 --> N'=2 (Delta_N=0) core excitations. We have also calculated the DR...
Soft X-ray Spectroscopy of Seyfert 2 Galaxies (2001)
Kinkhabwala, A., Sako, M., Behar, E., Paerels, F., Kahn, S. M., Brinkman, A. C., ...
Soft X-ray spectroscopy of Seyfert 2 galaxies offers perhaps the best method to probe the possible connection between AGN activity and star formation. Obscuration of powerful radiation from the...
High Resolution X-ray Spectroscopy of Seyfert 2 Galaxies (2001)
Kahn, S. M., Kinkhabwala, A., Sako, M., Behar, E., Paerels, F. B. S., Brinkman, A. C., ...
X-ray spectroscopy of Seyfert 2 galaxies provides an excellent probe of the circumnuclear environment in active galactic nuclei. The grating experiments on both Chandra and XMM-Newton have now...
Confronting atomic data with Fe L-shell spectra of stellar coronae (2001)
Behar, E., Cottam, J., Peterson, J. R., Sako, M., Kahn, S. M., Bar-Shalom, A., ...
It is common to suggest the uncertainties in the atomic data for explaining difficulties that arise in interpreting astrophysical x-ray spectra. The atomic data for the Fe L-shell ions have, over the...
Behar, E., Kinkhabwala, A., Sako, M., Paerels, F., Kahn, S. M., Brinkman, A. C., ...
Preliminary analysis of the X-ray spectrum of NGC 1068 obtained by the RGS spectrometer on board XMM-Newton is presented. A physically consistent model is developed in order to quantitatively...
Stellar Coronae with \textit{XMM-Newton} RGS. I. Coronal Structure (2000)
Guedel, M., Audard, M., Boggende, A. J. Den, Brinkman, A. C., Herder, J. W. Den, Kaastra, J. S., ...
First results from high-resolution coronal spectroscopy with the {\it XMM-Newton} Reflection Grating Spectrometers (RGS) are reviewed. Five stellar systems (HR 1099, Capella, Procyon, YY Gem, AB Dor)...
Stellar Coronae with \textit{XMM-Newton} RGS. II. X-ray Variability (2000)
Audard, M., Guedel, M., Boggende, A. J. Den, Brinkman, A. C., Herder, J. W. Den, Kaastra, J. S., ...
First results from high-resolution coronal spectroscopy of flares with the Reflection Grating Spectrometers on board the \textit{XMM-Newton} satellite are reviewed. Rotational modulation in the X-ray...
Brinkman, A. C., Behar, E., Guedel, M., Audard, M., Branduardi-Raymont, G., ...
The RS CVn binary system HR 1099 was extensively observed by the XMM-Newton observatory in February 2000 as its first-light target. A total of 570 ks of exposure time was accumulated with the...
Complex resonance absorption structure in the X-ray spectrum of IRAS13349+2438 (2000)
Sako, M., Kahn, S. M., Behar, E., Kaastra, J. S., Brinkman, A. C., Boller, Th., ...
The luminous infrared-loud quasar IRAS 13349+2438 was observed with the XMM-Newton Observatory as part of the Performance Verification program. The spectrum obtained by the Reflection Grating...