464 citations · 2.2k across the 74 of their papers we have counts for
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Evidence of unrelaxed IGM around IC1262
G. Trinchieri, D. Breitschwerdt, W. Pietsch +2
AIMS: A peculiar morphology of the hot gas was discovered at the center of IC1262 with the ROSAT HRI. Sensitive Chandra and XMM-Newton data were requested to investigate the charac…
The nature of Composite Seyfert/Star-forming galaxies revealed by X-ray observations
F. Panessa, A. Wolter, S. Pellegrini +5
This paper presents new Chandra and BeppoSAX observations aimed at investigating the optical/X-ray mismatch in the enigmatic class of the Composite galaxies, discovered by a cross-…
X-ray properties of the "Composite" Seyfert/Star-forming galaxies
A. Wolter, G. Trinchieri, R. Della Ceca +7
An enigmatic, small class of IR and X-ray luminous sources, named ``Composite'' starburst/Seyfert galaxies, has been defined from IRAS and RASS data. The objects have optical spect…
A thorough study of the intriguing X-ray emission from the Cartwheel ring
Anna Wolter, Ginevra Trinchieri
We present the results from the high resolution Chandra observation of the Cartwheel galaxy. Many individual sources are resolved in the image, mostly associated with the outer rin…
BL Lac evolution revisited
Anna Wolter, Francesca Cavallotti, John T. Stocke +1
BL Lac objects are an elusive and rare class of active galactic nuclei. For years their evolutionary behavior has appeared inconsistent with the trend observed in the population of…
Radio spectra of a sample of X-ray selected BL Lacs
Francesca Cavallotti, Anna Wolter, John T. Stocke +1
We present simultaneous multifrequency radio observations for a complete subsample of 26 XBLs from the Einstein Extended Medium-Sensitivity Survey, obtained with the Very Large Arr…
The Gamma-ray bright BL Lac object RX J1211+2242
V. Beckmann, P. Favre, F. Tavecchio +3
RX J1211+2242 is an optically faint (B = 19.2 mag) but X-ray bright (2 - 10 keV flux fx = 5e-12 erg/cm**2/sec) AGN, which has been shown to be a BL Lac object at redshift z = 0.455…
The XMM-Newton HBS28 sample: studying the obscuration in hard X-ray selected AGNs
A. Caccianiga, P. Severgnini, V. Braito +8
This paper presents the analysis of a statistically complete sample of 28 serendipitous X-ray sources selected in 82 pointed XMM-Newton fields down to a count-rate of 0.002 counts…
BeppoSAX Observations of 1-Jy BL Lacertae Objects - II
P. Padovani, L. Costamante, P. Giommi +3
We present new BeppoSAX LECS and MECS observations, covering the energy range 0.1 - 10 keV (observer's frame), of four BL Lacertae objects selected from the 1 Jy sample. All source…
The Cartwheel ring under X-ray light
A. Wolter, G. Trinchieri
The Cartwheel, archetypical ring galaxy with strong star formation activity concentrated in a peculiar annular structure, has been imaged with the CHANDRA ACIS-S instrument. We pre…
The last Gift of BeppoSAX: PDS Observations of the two Blazars 1ES 0507-040 and PKS 1229-021
L. Chiappetti, G. Ghisellini, L. Maraschi +4
Towards the end of the BeppoSAX mission, the only operated Narrow Field Instrument was the PDS, which covers the energy range 13-300 keV. Two blazars, 1ES 0507-040 (z=0.304) and PK…
A Hard Medium Survey with ASCA. IV: the Radio-Loud Type 2 QSO AXJ0843+294 2
R. Della Ceca, V. Braito, V. Beckmann +6
We discuss the X-ray, optical and radio properties of AX J0843+2942, a high luminosity Type 2 AGN found in the ASCA Hard Serendipitous Survey. The X-ray spectrum is best described…
XMM-Newton observations expose AGN in apparently normal galaxies
P. Severgnini, A. Caccianiga, V. Braito +12
We have performed a detailed analysis of 3 optically normal galaxies extracted from the XMM Bright Serendipitous Source Sample. Thanks to the good statistics of the XMM-Newton data…
The nature of the "Composite" Seyfert/Star-forming Galaxies
F. Panessa, M. Cappi, L. Bassani +6
We present the results obtained with BeppoSAX observations of the three Composite Seyfert/star-forming galaxies: IRAS 20051-1117, IRAS 04392-0123 and IRAS 01072+4954. These sources…
The BeppoSAX view of extreme BL Lacs
L. Costamante, G. Ghisellini, A. Celotti +1
With its very wide energy band (0.1-100 keV), BeppoSAX has played a fundamental role in the blazar field, allowing in particular a better study of the highest synchrotron peaked ob…
On the cosmological evolution of BL Lacs
A. Caccianiga, T. Maccacaro, A. Wolter +2
We study the cosmological evolution of BL Lac objects by applying the Ve/Va analysis to a new sample of 55 objects presented for the first time in this paper. This sample has been…
Unveiling the AGN powering the "Composite" Seyfert/Star-forming galaxy NGC 7679: BeppoSAX and ASCA results
R. Della Ceca, S. Pellegrini, L. Bassani +5
We discuss BeppoSAX observations and archive ASCA data of NGC 7679, a nearby, nearly face-on SB0 galaxy in which starburst and AGN activities coexist. The X-ray observations reveal…
An X-ray selected sample of radio-loud quasars
Anna Wolter, Annalisa Celotti
We construct the first X-ray selected sample of broad line radio-loud AGN from the EMSS survey. In order to test unifying schemes for radio-loud objects, their spectral and statist…
The European Large Area ISO Survey V: a BeppoSAX hard X-ray survey of the S1 region
D. M. Alexander, F. La Franca, F. Fiore +18
We present BeppoSAX observations of the Southern S1 region in the European Large Area ISO Survey (ELAIS). These observations cover an area of ~1.7 sq. deg. and reach an on-axis (~0…
Broad band properties of medium and low Lx/Lb Early Type Galaxies
G. Trinchieri, S. Pellegrini, A. Wolter +2
We have measured the spectral properties of five galaxies of low to intermediate Lx/Lb ratios with BeppoSAX and ASCA. A hard component (kT ~4-10 keV) is observed in all galaxies. I…
The EMSS Radio Loud Quasar Sample
Anna Wolter, Annalisa Celotti
We construct the first X-ray selected sample of radio-loud quasars from the EMSS survey. The X-ray selection allows us to explore the properties of radio-loud quasars 10-100 weaker…
Two BeppoSAX observations of BL Lac
G. Tagliaferri, G. Ghisellini, M. Ravasio +14
We present the results of two ToO BeppoSAX observations of BL Lac. During the first observation we detected both the synchrotron and the Compton components. Fast time variability w…
Hard synchrotron BL Lacs: the case of 1ES 1101-232
Anna Wolter, Gabriele Ghisellini, Gianpiero Tagliaferri +2
The bright X-ray selected BL Lac object 1ES1101--232 shows a flat X-ray spectrum, making it detectable with high statistics over the wide BeppoSAX energy range. We have observed it…
New results from the HRX BL Lac sample
Volker Beckmann, Anna Wolter
We present results for the Hamburg BL Lac sample, based on data provided by the RASS-BSC. By fitting a single power law to the X-ray data we find, in a number of objects, an additi…