Zobrazeno 1 - 10
of 217
pro vyhledávání: '"Griffiths, R. G."'
The bright blazar Mkn 421 has been observed four times for uninterrupted durations of ~ 9 - 13 hr during the performance verification and calibration phases of the XMM-Newton mission. The source was strongly variable in all epochs, with variability a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204179
Autor:
Ferrando, P., Abbey, A. F., Altieri, B., Arnaud, M., Bennie, P., Dadina, M., Denby, M., Ghizzardi, S., Griffiths, R. G., La Palombara, N., de Luca, A., Lumb, D., Molendi, S., Neumann, D., Sauvageot, J. L., Saxton, R. D., Sembay, S., Tiengo, A., Turner, M. J. L.
The XMM-Newton observatory has the largest collecting area flown so far for an X-ray imaging system, resulting in a very high sensitivity over a broad spectral range. In order to exploit fully these performances, a very accurate calibration of the XM
Externí odkaz:
http://arxiv.org/abs/astro-ph/0202372
Autor:
Akylas, A., Georgantopoulos, I., Griffiths, R. G., Papadakis, I. E., Mastichiadis, A., Warwick, R. S., Nandra, K., Smith, D. A.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 332 (2002) L23
We analyze 37 RXTE observations of the type 2 Seyfert galaxy Mrk348 obtained during a period of 14 months. We confirm the spectral variability previous reported by Smith et al., in the sense that thecolumn density decreases by a factor of ~3 as the c
Externí odkaz:
http://arxiv.org/abs/astro-ph/0112280
Autor:
Warwick, R. S., Bernard, J-P., Bocchino, F., Decourchelle, A., Ferrando, P., Griffiths, R. G., Haberl, F., La Palombara, N., Lumb, D., Mereghetti, S., Read, A. M., Schaudel, D., Schurch, N., Tiengo, A., Willingale, R.
Recent XMM-Newton observations reveal an extended (150") low-surface brightness X-ray halo in the supernova remnant G21.5-0.9. The near circular symmetry, the lack of any limb brightening and the non-thermal spectral form, all favour an interpretatio
Externí odkaz:
http://arxiv.org/abs/astro-ph/0011245
Autor:
Brinkmann, W., Sembay, S., Griffiths, R. G., Branduardi-Raymont, G., Gliozzi, M., Boller, Th., Tiengo, A., Molendi, S., Zane, S.
The BL Lac object Mrk 421 was observed on May 25, 2000 during the XMM - Newton CAL/PV phase. The high throughput of the X-ray telescopes and the spectral capabilities of the instruments allow an uninterrupted temporal and spectral study of the source
Externí odkaz:
http://arxiv.org/abs/astro-ph/0011193
Autor:
Georgantopoulos, I., Papadakis, I., Warwick, R. S., Smith, D. A., Stewart, G. C., Griffiths, R. G.
We present Rossi X-ray Timing Explorer, monitoring observations of the Seyfert 2 galaxy Markarian 3 spanning a 200 day period during which time the source flux varied by a factor $\sim 2$ in the 4-20 keV bandpass. In broad agreement with earlier Ging
Externí odkaz:
http://arxiv.org/abs/astro-ph/9903083
We have used non-simultaneous Ginga, ASCA and ROSAT observations to investigate the complex X-ray spectrum of the Seyfert 2 galaxy Mrk 3. We find that the composite spectrum can be well described in terms of a heavily cut-off hard X-ray continuum, ir
Externí odkaz:
http://arxiv.org/abs/astro-ph/9804247
Autor:
Ferrando, Philippe, Abbey, Anthony F., Altieri, Bruno, Arnaud, Monique, Bennie, Paul J., Dadina, Mauro, Denby, Mark, Ghizzardi, Simona, Griffiths, R. G., Kirsch, Marcus, La Palombara, Nicola, de Luca, A., Lumb, David H., Molendi, Silvano, Neumann, Doris
Publikováno v:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, S. Diego CA (USA), 2003
info:cnr-pdr/source/autori:Ferrando, Philippe; Abbey, Anthony F.; Altieri, Bruno; Arnaud, Monique; Bennie, Paul J.; Dadina, Mauro; Denby, Mark; Ghizzardi, Simona; Griffiths, R. G.; Kirsch, Marcus; La Palombara, Nicola; de Luca, A.; Lumb, David H.; Molendi, Silvano; Neumann, Doris;/congresso_nome:X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy/congresso_luogo:S. Diego CA (USA)/congresso_data:2003/anno:2003/pagina_da:/pagina_a:/intervallo_pagine
info:cnr-pdr/source/autori:Ferrando, Philippe; Abbey, Anthony F.; Altieri, Bruno; Arnaud, Monique; Bennie, Paul J.; Dadina, Mauro; Denby, Mark; Ghizzardi, Simona; Griffiths, R. G.; Kirsch, Marcus; La Palombara, Nicola; de Luca, A.; Lumb, David H.; Molendi, Silvano; Neumann, Doris;/congresso_nome:X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy/congresso_luogo:S. Diego CA (USA)/congresso_data:2003/anno:2003/pagina_da:/pagina_a:/intervallo_pagine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=cnr_________::8d761f57a75d675730c62d9529743cf4
http://www.cnr.it/prodotto/i/74629
http://www.cnr.it/prodotto/i/74629
Autor:
Turner, Martin J. L., Briel, Ulrich G., Ferrando, Philippe, Griffiths, R. G., Villa, Gabriele E.
Publikováno v:
Proceedings of SPIE; Nov2003, Issue 1, p169-180, 12p
