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26 papers
Cyclotron lines in subcritical X-ray pulsars: Monte Carlo simulations reveal the origin of the observed variability
Prodromos Fotiadis, Nick Loudas, Nikolaos D. Kylafis +1
Observed cyclotron resonant scattering features (CRSFs) in X-ray pulsars (XRPs) exhibit strong variability. In the subcritical luminosity regime, the centroid energy () a…
A quantitative explanation of the cyclotron-line variation in accreting magnetic neutron stars of super-critical luminosity
Nick Loudas, Nikolaos D. Kylafis, Joachim E. Trümper
Magnetic neutron stars (NSs) often exhibit a cyclotron resonant scattering feature (CRSF) in their X-ray spectra. Cyclotron lines are believed to form in the radiative shock in the…
Cyclotron line formation by reflection on the surface of a magnetic neutron star
N. D. Kylafis, J. E. Trümper, N. A. Loudas
Accretion onto magnetic neutron stars results in X-ray spectra that often exhibit a cyclotron resonance scattering feature (CRSF) and, sometimes, higher harmonics of it. Two places…
The extended Northern ROSAT Galaxy Cluster Survey (NORAS II) I. Survey Construction and First Results
Hans Boehringer, Gayoung Chon, Joerg Retzlaff +3
As the largest, clearly defined building blocks of our Universe, galaxy clusters are interesting astrophysical laboratories and important probes for cosmology. X-ray surveys for ga…
Second ROSAT all-sky survey (2RXS) source catalogue
Th. Boller, M. J. Freyberg, J. Truemper +3
We present the second ROSAT all-sky survey source catalogue, hereafter referred to as the 2RXS catalogue. This is the second publicly released ROSAT catalogue of point-like sources…
Spectral formation in a radiative shock: application to anomalous X-ray pulsars and soft gamma-ray repeaters
N. D. Kylafis, J. E. Truemper, U. Ertan
In the fallback disk model for the persistent emission of Anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), the hard X-ray emission arises from bulk- and thermal…
On The Evolution of The Radio Pulsar PSR J1734-3333
S. Caliskan, U. Ertan, M. A. Alpar +2
Recent measurements showed that the period derivative of the 'high-B' radio pulsar PSR J1734-3333 is increasing with time. For neutron stars evolving with fallback disks, this rota…
An XMM-Newton observation of Ton S180: Constraints on the continuum emission in ultrasoft Seyfert galaxies
S. Vaughan, Th. Boller, A. C. Fabian +3
We present an XMM-Newton observation of the bright, narrow-line, ultrasoft Seyfert 1 galaxy Ton S180. The 0.3-10 keV X-ray spectrum is steep and curved, showing a steep slope above…
1E 1207.4-5209: The puzzling pulsar at the center of the PKS 1209-51/52 supernova remnant
G. G. Pavlov, V. E. Zavlin, D. Sanwal +1
Second Chandra observation of 1E 1207.4-5209, the central source of the supernova remnant PKS 1209-51/52, allowed us to confirm the previously detected period of 424 ms and, assumi…
X-ray Radiation from the Millisecond Pulsar J0437-4715
V. E. Zavlin, G. G. Pavlov, D. Sanwal +4
We report on spectral and timing observations of the nearest millisecond pulsar J0437-4715 with Chandra. The pulsar spectrum, detected up to 7 keV, cannot be described by a simple…
The Chandra LETGS high resolution X-ray spectrum of the isolated neutron star RX J1856.5-3754
V. Burwitz, V. E. Zavlin, R. Neuhaeuser +3
We present the Chandra LETGS X-ray spectrum of the nearby (~60 pc) neutron star RX J1856.5-3754. Detailed spectral analysis of the combined X-ray and optical data rules out the non…
The second ROSAT PSPC survey of M31 and the complete ROSAT PSPC source list
R. Supper, G. Hasinger, W. H. G. Lewin +5
This paper reports the results of the analysis of the second ROSAT PSPC survey of M31 performed in summer 1992. We compare our results with those of the first survey. Within the ~1…
The ROSAT Deep Survey: VI. X-ray sources and Optical identifications of the Ultra Deep Survey
I. Lehmann, G. Hasinger, M. Schmidt +10
We describe in this paper the ROSAT Ultra Deep Survey (UDS), an extension of the ROSAT Deep Survey (RDS) in the Lockman Hole. The UDS reaches a flux level of 1.2 x 10E-15 erg/cm2/s…
The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
M. J. L. Turner, A. Abbey, M. Arnaud
The EPIC focal plane imaging spectrometers on XMM-Newton use CCDs to record the images and spectra of celestial X-ray sources focused by the three X-ray mirrors. There is one camer…
The first broad-band X-ray images and spectra of the 30 Doradus region in the LMC
K. Dennerl, F. Haberl, B. Aschenbach +25
We present the XMM-Newton first light image, taken in January 2000 with the EPIC pn camera during the instrument's commissioning phase, when XMM-Newton was pointing towards the Lar…
AGN in the XMM-Newton first-light image as probes for the interstellar medium in the LMC
F. Haberl, K. Dennerl, M. D. Filipovic +3
The XMM-Newton first-light image revealed X-ray point sources which show heavily absorbed power-law spectra. The spectral indices and the probable identification of a radio counter…
Detection of an X-ray periodicity in the Narrow-line Seyfert 1 Galaxy Mrk 766 with XMM-Newton
Th. Boller, R. Keil, J. Truemper +3
We have analyzed the timing properties of the Narrow-line Seyfert 1 galaxy Mrk 766 observed with XMM-Newton during the PV phase. The source intensity changes by a factor of 1.3 ove…
XMM-Newton First-Light Observations of the Hickson Galaxy Group 16
M. J. L. Turner, J. N. Reeves, T. J. Ponman +7
This paper presents the XMM-Newton first-light observations of the Hickson-16 compact group of galaxies. Groups are possibly the oldest large-scale structures in the Universe, pre-…
X-Rays from the Nearby Solitary Millisecond Pulsar PSR J0030+0451 - the Final ROSAT Observations
Werner Becker, Joachim Tr"umper, Andrea N. Lommen +1
We report on X-ray observations of the solitary 4.8 ms pulsar PSR J0030+0451. The pulsar was one of the last targets observed in DEC-98 by the ROSAT PSPC. X-ray pulses are detected…
The Northern ROSAT All-Sky (NORAS) Galaxy Cluster Survey I: X-ray Properties of Clusters Detected as Extended X-ray Sources
H. Boehringer, W. Voges, J. P. Huchra +11
In the construction of an X-ray selected sample of galaxy clusters for cosmological studies, we have assembled a sample of 495 X-ray sources found to show extended X-ray emission i…
The Compact Central Object in Cas A: A Neutron Star with Hot Polar Caps or a Black Hole?
G. G. Pavlov, V. E. Zavlin, B. Aschenbach +2
The central pointlike X-ray source of the Cas A supernova remnant was discovered in the Chandra First Light Observation and found later in the archival ROSAT and Einstein images. T…
The ROSAT Deep Survey: III. Optical spectral properties of X-ray sources in the Lockman Hole
I. Lehmann, G. Hasinger, M. Schmidt +6
The ROSAT Deep Survey in the Lockman Hole contains a complete sample of 50 X-ray sources with fluxes in the 0.5-2.0 keV band larger than 5.5E-15 erg/cm2/s. Previous work has provid…
The ROSAT BRIGHT survey: I. Identification of an AGN sample with hard ROSAT X-ray spectra
J. -U. Fischer, G. Hasinger, A. D. Schwope +5
The ROSAT Bright Survey (RBS) aims to completely optically identify the more than 2000 brightest sources detected in the ROSAT all-sky survey at galactic latitudes |b| > 30 degr (e…
The ROSAT Deep Survey I. X-ray sources in the Lockman Field
Guenther Hasinger, Richard Burg, Riccardo Giacconi +3
The ROSAT Deep Survey in the Lockman Hole is the most sensitive X-ray survey performed to date, encompassing an exposure time of 207 ksec with the PSPC and a total of 1.32 Msec wit…