Search Publications
XMM-Newton Reflection Grating Spectrometer Observations of Discrete Soft X-Ray Emission Features from NGC 1068
Kahn, Steven M.; Paerels, Frits; Behar, Ehud +6 more
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 (RGS). Emission lines from H-like and He-like low-Z ions (from C to Si) and Fe L-shell ions dominate the spectrum. Strong, narrow radiative recombination continua (…
High-Resolution Observations of the Elliptical Galaxy NGC 4636 with the Reflection Grating Spectrometer on Board XMM-Newton
Behar, E.; Kahn, S. M.; Mushotzky, R. F. +6 more
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 resulting spectrum contains a wealth of emission lines from various charge states of oxygen, neon, magnesium, and iron. Examination of the cross-dispersi…
Evidence of Spin and Energy Extraction in a Galactic Black Hole Candidate: The XMM-Newton/EPIC-pn Spectrum of XTE J1650-500
Wijnands, R.; Fabian, A. C.; Miller, J. M. +7 more
We observed the Galactic black hole candidate XTE J1650-500 early in its fall of 2001 outburst with the XMM-Newton European Photon Imaging pn Camera (EPIC-pn). The observed spectrum is consistent with the source having been in the ``very high'' state. We find a broad, skewed Fe Kα emission line that suggests the primary in this system may be a Ker…
The HELLAS2XMM Survey. II. Multiwavelength Observations of P3: An X-Ray-bright, Optically Inactive Galaxy
Maiolino, R.; Perola, G. C.; Fiore, F. +11 more
Recent X-ray surveys have clearly demonstrated that a population of optically dull, X-ray-bright galaxies is emerging at 2-10 keV fluxes of the order of 10-14 ergs cm-2 s-1. Although they might constitute an important fraction of the sources responsible for the hard X-ray background, their nature is still unknown. …
Narrow Components within the Fe Kα Profile of NGC 3516: Evidence of the Importance of General Relativistic Effects?
Nandra, K.; Turner, T. J.; Kraemer, S. B. +6 more
We present results from a simultaneous Chandra High Energy Transmission Grating and XMM-Newton observation of NGC 3516. We find evidence of several narrow components of Fe Kα along with a broad line. We consider the possibility that the lines arise in a blob of material ejected from the nucleus with velocity ~0.25c. We also consider an origin in a…
The HELLAS2XMM Survey. I. The X-Ray Data and the logN-logS Relation
Fiore, F.; Vignali, C.; Molendi, S. +3 more
We present the first results from an XMM-Newton serendipitous medium-deep survey, which covers nearly 3 deg2. We detect a total of 1022, 495, and 100 sources, down to minimum fluxes of about 5.9×10-16, 2.8×10-15, and 6.2×10-15 ergs cm-2 s-1, in the 0.5-2, 2-10, and 4.5-10 keV bands,…
Discovery of an Ionized Fe K Edge in the z=3.91 Broad Absorption Line Quasar APM 08279+5255 with XMM-Newton
Schartel, N.; Hasinger, G.; Komossa, S.
Recent XMM-Newton observations of the high-redshift, lensed, broad absorption line (BAL) quasi-stellar object APM 08279+5255, one of the most luminous objects in the universe, allowed the detection of a high column density absorber (NH~1023 cm-2) in the form of a K-shell absorption edge of significantly ionized iro…
An XMM-Newton Study of the 401 Hz Accreting Pulsar SAX J1808.4-3658 in Quiescence
Campana, S.; Mereghetti, S.; Stella, L. +6 more
SAX J1808.4-3658 is a unique source, being the first low-mass X-ray binary showing coherent pulsations at a spin period comparable to that of millisecond radio pulsars. Here we present an XMM-Newton observation of SAX J1808.4-3658 in quiescence, the first that assessed its quiescent luminosity and spectrum with a good signal-to-noise ratio. XMM-Ne…
The Diversity of Extremely Red Objects
Ivison, R. J.; Smail, Ian; Morrison, G. E. +3 more
We present the results from a sensitive multiwavelength analysis of the properties of extremely red objects (EROs). Our analysis employs deep RIzJHK photometry of an 8.5‧×8.5‧ region to select a sample of 68 EROs with (R-K)>=5.3 and brighter than K=20.5 (5 σ). We combine this photometric data set with an extremely deep 1.4 GHz radio map of the …
Pulse Phase Variations of the X-Ray Spectral Features in the Radio-quiet Neutron Star 1E 1207-5209
Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +3 more
We present the results of an XMM-Newton observation of the radio-quiet X-ray pulsar 1E 1207-5209 located at the center of the shell-like supernova remnant G296.5+10.0. The X-ray spectrum is characterized by the presence of two phase-dependent absorption lines at energies of ~0.7 and ~1.4 keV. Moreover, these broad spectral features have significan…