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35 results on '"Boller, Th."'

1. Steep-spectrum AGN in eROSITA Final Equatorial-Depth Survey (eFEDS): Their host galaxies and multi-wavelength properties

Author

Iwasawa, K., primary, Liu, T., additional, Boller, Th., additional, Buchner, J., additional, Li, J., additional, Kawaguchi, T., additional, Nagao, T., additional, Terashima, Y., additional, Toba, Y., additional, Silverman, J. D., additional, Arcodia, R., additional, Dauser, Th., additional, Krumpe, M., additional, Nandra, K., additional, and Wilms, J., additional

Published
2024
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2. The eROSITA Final Equatorial Depth Survey (eFEDS): Complex absorption and soft excesses in hard X-ray–selected active galactic nuclei.

Author

Waddell, S. G. H., Nandra, K., Buchner, J., Wu, Q., Shen, Y., Arcodia, R., Merloni, A., Salvato, M., Dauser, T., Boller, Th., Liu, T., Comparat, J., Wolf, J., Dwelly, T., Ricci, C., Brownstein, J. R., and Brusa, M.

Subjects
ACTIVE galactic nuclei, X-ray spectra, OPTICAL spectroscopy, ACTIVE galaxies, BAYESIAN analysis, SOFT X rays
Abstract

Context. The soft excess, a surplus of X-ray photons below 2 keV with respect to a power law, is a feature of debated physical origin found in the X-ray spectra of many type-1 active galactic nuclei (AGN). The eROSITA instrument aboard the Spectrum-Roentgen-Gamma (SRG) mission will provide an all-sky census of AGN. Spectral fitting of these sources can help identify the physical origin of the soft excess. Aims. The eROSITA Final Equatorial Depth Survey (eFEDS) field, designed to mimic the expected average equatorial depth of the all-sky survey, provides the ideal sample to test the power of eROSITA. The primary goal of this work is to test a variety of models for the soft X-ray emission of AGN (thermal emission, non-thermal emission, ionised absorption, or neutral partial covering absorption) to help identify the physical origin of the soft X-ray spectral complexity. Differences between these models are examined in the context of this sample to understand the physical properties. Methods. We used Bayesian X-ray analysis to fit a sample of 200 AGN from the eFEDS hard X-ray–selected sample with a variety of phenomenological and physically motivated models. Model selection is performed using the Bayes factor to compare the applicability of each model for individual sources as well as for the full sample, and source properties are compared and discussed. Black hole masses and Eddington ratios were estimated from optical spectroscopy. Results. We find that 29 sources have evidence for a soft excess at a confidence level > 97.5%, all of which are better modelled by an additional soft power-law, as opposed to thermal blackbody emission. Applying more physically motivated soft excess emission models, we find that 23 sources prefer a warm corona model, while only six sources are best fit with relativistic blurred reflection. Sources with a soft excess show a significantly higher Eddington ratio than the remainder of the sample. Of the remainder of the sample, many sources show evidence for complex absorption, with 29 preferring a warm absorber, and 25 a partial covering absorber. Many (18/26) sources that show significant neutral absorption when modelled with an absorbed power law, in fact show evidence that the absorber is ionised, which has important implications on the understanding of obscured AGN. In contrast to the soft excesses, warm absorber sources show significantly lower Eddington ratios than the remainder of the sample. We discuss the implications of these results for the physical processes in the central regions of AGN. Conclusions. Spectral fitting with Bayesian statistics is ideal for the identification of complex absorption and soft excesses in the X-ray spectra of AGN, and can allow one to distinguish between different physical interpretations. Applying the techniques from this work to the eROSITA all-sky survey will provide a more complete picture of the prevalence and origin of soft excesses and warm absorbers in type-1 AGN in the local Universe. [ABSTRACT FROM AUTHOR]

Published
2024
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3. The eROSITA Final Equatorial Depth Survey (eFEDS): Complex absorption and soft excesses in hard X-ray-selected active galactic nuclei

Author

Waddell, S., primary, Nandra, K., additional, Buchner, J., additional, Wu, Q., additional, Shen, Y., additional, Arcodia, R., additional, Merloni, A., additional, Salvato, M., additional, Dauser, T., additional, Boller, Th., additional, Liu, T., additional, Comparat, J., additional, Wolf, J., additional, Dwelly, T., additional, Ricci, C., additional, and Brownstein, J., additional

Published
2023
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5. eROSITA spectro-imaging analysis of the Abell 3408 galaxy cluster

Author

Iljenkarevic, J., primary, Reiprich, T. H., additional, Pacaud, F., additional, Veronica, A., additional, Whelan, B., additional, Aschersleben, J., additional, Migkas, K., additional, Bulbul, E., additional, Sanders, J. S., additional, Ramos-Ceja, M. E., additional, Liu, T., additional, Ghirardini, V., additional, Liu, A., additional, and Boller, Th., additional

Published
2022
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6. The eROSITA Final Equatorial-Depth Survey (eFEDS)

Author

Boller, Th., primary, Schmitt, J. H. M. M., additional, Buchner, J., additional, Freyberg, M., additional, Georgakakis, A., additional, Liu, T., additional, Robrade, J., additional, Merloni, A., additional, Nandra, K., additional, Malyali, A., additional, Krumpe, M., additional, Salvato, M., additional, and Dwelly, T., additional

Published
2022
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8. Exceptional AGN long-timescale X-ray variability: The case of PHL 1092

Author

Gallo L.C., Fabian A.C., Schneider D.P., Brandt W.N., Miniutti G., and Boller Th.

Subjects
Physics, QC1-999
Abstract

PHL 1092 is a z ∼ 0.4 high-luminosity counterpart of the class of Narrow–Line Seyfert 1 galaxies. In 2008, PHL 1092 was found to be in a remarkably low X-ray flux state during an XMM–Newton observation. Its 2 keV flux density had dropped by a factor of ∼ 260 with respect to a previous observation performed 4.5 yr earlier. The UV flux remained almost constant, resulting in a significant steepening of the optical-to-X-ray slope αox from − 1.57 to − 2.51, making PHL 1092 one of the most extreme X-ray weak quasars with no observed broad absorption lines (BALs) in the UV. We have monitored the source since 2008 with three further XMM–Newton observations, producing a simultaneous UV and X-ray database spanning almost 10 yr in total in the activity of the source. We present here results from our monitoring campaign.

Published
2012
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10. XMM-Newtonobservation of the ULIRG NGC 6240

Author

Boller, Th., Keil, R., Hasinger, G., Costantini, E., Lehmann, I., Gallo, L., Fujimoto, Ryuichi, and Anabuki, Naohisa

Subjects
Physics, Plasma parameters, Infrared, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Plasma, K-line, Galaxy, Space and Planetary Science, Beta (plasma physics), Ionization, Astrophysics::Galaxy Astrophysics, Line (formation)
Abstract

We report on an XMM-Newton observation of the ultraluminous infrared galaxy NGC 6240. The 0.3-10 keV spectrum can be successfully modelled with: (i) three collisionally ionized plasma components with temperatures of about 0.7, 1.4, and 5.5 keV; (ii) a highly absorbed direct power-law component; and (iii) a neutral Fe K_alpha and K_beta line. We detect a significant neutral column density gradient which is correlated with the temperature of the three plasma components. Combining the XMM-Newton spectral model with the high spatial resolution Chandra image we find that the temperatures and the column densities increase towards the center. With high significance, the Fe K line complex is resolved into three distinct narrow lines: (i) the neutral Fe K_alpha line at 6.4 keV; (ii) an ionized line at about 6.7 keV; and (iii) a higher ionized line at 7.0 keV (a blend of the Fe XXVI and the Fe K_beta line). While the neutral Fe K line is most probably due to reflection from optically thick material, the Fe XXV and Fe XXVI emission arises from the highest temperature ionized plasma component. We have compared the plasma parameters of the ultraluminous infrared galaxy NGC 6240 with those found in the local starburst galaxy NGC 253. We find a striking similarity in the plasma temperatures and column density gradients, suggesting a similar underlying physical process at work in both galaxies., Comment: 8 pages including 9 figures. Accepted for publication in A&A

Published
2003
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12. V. The Second XMM-Newton serendipitous source catalogue

Author

Watson, M. G., Schröder, A. C., Fyfe, D., Page, C. G., Lamer, Georg, Mateos, Silvia, Pye, J. P., Sakano, M., Rosen, Simon, Ballet, J., Barcons, Xavier, Barret, Didier, Boller, Th., Brunner, H., Brusa, M., Caccianiga, A., Carrera, Francisco J., Ceballos, María Teresa, Della Ceca, R., Denby, M., Denkinson, G., Dupuy, S., Farrell, S. A., Fraschetti, F., Freyberg, M. J., Guillout, P., Hambaryan, V., Maccacaro, T., Mathiesen, B., McMahon, Richard G., Michel, L., Motch, C., Osborne, J. P., Page, M. J., Pakull, M. W., Pietsch, W., Saxton, R. D., Schwope, A., Severgnini, P., Simpson, M., Sironi, G., Stewart, G. C., Stewart, Ian M., Stobbart, A.-M., Tedds, J. A., Warwick, R. S., Webb, N. A., West, R. G., Worrall, D. M., Yuan, W., Max Planck Society, Ministero dell'Istruzione, dell'Università e della Ricerca, Istituto Nazionale di Astrofisica, Agenzia Spaziale Italiana, German Centre for Air and Space Travel, Centre National D'Etudes Spatiales (France), Federal Ministry of Economics and Technology (Germany), Science and Technology Facilities Council (UK), and Ministerio de Educación y Ciencia (España)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Surveys, X-rays: general, Catalogues, Astrophysics::Galaxy Astrophysics
Abstract

[Aims]: Pointed observations with XMM-Newton provide the basis for creating catalogues of X-ray sources detected serendipitously in each field. This paper describes the creation and characteristics of the 2XMM catalogue. [Methods]: The 2XMM catalogue has been compiled from a new processing of the XMM-Newton EPIC camera data. The main features of the processing pipeline are described in detail. [Results]: The catalogue, the largest ever made at X-ray wavelengths, contains 246 897 detections drawn from 3491 public XMM-Newton observations over a 7-year interval, which relate to 191 870 unique sources. The catalogue fields cover a sky area of more than 500 deg2. The non-overlapping sky area is ∼360 deg2 (∼1% of the sky) as many regions of the sky are observed more than once by XMM-Newton. The catalogue probes a large sky area at the flux limit where the bulk of the objects that contribute to the X-ray background lie and provides a major resource for generating large, well-defined X-ray selected source samples, studying the X-ray source population and identifying rare object types. The main characteristics of the catalogue are presented, including its photometric and astrometric properties., M. Ceballos, F. Carrera and X. Barcons acknowledge financial support by the Spanish Ministerio de Educacion y Ciencia under projects ESP2003-00812 and ESP2006-13608-C02-01. The French teams are grateful to CNES for supporting this activity. In Germany the XMM-Newton project is supported by the Bundesministerium für Wirtschaft und Technologie/Deutsches Zentrum für Luft und Raumfahrt e.V. (DLR) and the Max Planck Society. Part of this work was supported by the DLR project numbers 50 OX 0201, 50 OX 0001, and 50 OG 0502. The Italian team acknowledges financial support from the Agenzia Spaziale Italiana (ASI), the Ministero dell’ Istruzione, Università e Ricerca (MIUR) and the Istituto Nazionale di Astrofisica (INAF) over the last years; they are currently supported by the grant PRIN-MIUR 2006-02-5203 and by the ASI grants n.I/088/06/0 and n.I/023/05/0. UK authors thank STFC for financial support.

Published
2009

13. The XMM-Newton serendipitous survey

Author

Watson, M. G., Schröder, A. C., Fyfe, D., Page, C. G., Lamer, Georg, Mateos, Silvia, Pye, J. P., Sakano, M., Rosen, Simon, Ballet, J., Barcons, Xavier, Barret, Didier, Boller, Th., Brunner, H., Brusa, M., Caccianiga, A., Carrera, Francisco J., Ceballos, María Teresa, Della Ceca, R., Denby, M., Denkinson, G., Dupuy, S., Farrell, S. A., Fraschetti, F., Freyberg, M. J., Guillout, P., Hambaryan, V., Maccacaro, T., Mathiesen, B., McMahon, Richard G., Michel, L., Motch, C., Osborne, J. P., Page, M. J., Pakull, M. W., Pietsch, W., Saxton, R. D., Schwope, A., Severgnini, P., Simpson, M., Sironi, G., Stewart, G. C., Stewart, Ian M., Stobbart, A.-M., Tedds, J. A., Warwick, R. S., Webb, N. A., West, R. G., Worrall, D. M., Yuan, W., Max Planck Society, Ministero dell'Istruzione, dell'Università e della Ricerca, Istituto Nazionale di Astrofisica, Agenzia Spaziale Italiana, German Centre for Air and Space Travel, Centre National D'Etudes Spatiales (France), Federal Ministry of Economics and Technology (Germany), Science and Technology Facilities Council (UK), and Ministerio de Educación y Ciencia (España)

Subjects
general [X-rays], Surveys, Catalogues
Abstract

[Aims]: Pointed observations with XMM-Newton provide the basis for creating catalogues of X-ray sources detected serendipitously in each field. This paper describes the creation and characteristics of the 2XMM catalogue. [Methods]: The 2XMM catalogue has been compiled from a new processing of the XMM-Newton EPIC camera data. The main features of the processing pipeline are described in detail. [Results]: The catalogue, the largest ever made at X-ray wavelengths, contains 246 897 detections drawn from 3491 public XMM-Newton observations over a 7-year interval, which relate to 191 870 unique sources. The catalogue fields cover a sky area of more than 500 deg2. The non-overlapping sky area is ∼360 deg2 (∼1% of the sky) as many regions of the sky are observed more than once by XMM-Newton. The catalogue probes a large sky area at the flux limit where the bulk of the objects that contribute to the X-ray background lie and provides a major resource for generating large, well-defined X-ray selected source samples, studying the X-ray source population and identifying rare object types. The main characteristics of the catalogue are presented, including its photometric and astrometric properties. M. Ceballos, F. Carrera and X. Barcons acknowledge financial support by the Spanish Ministerio de Educacion y Ciencia under projects ESP2003-00812 and ESP2006-13608-C02-01. The French teams are grateful to CNES for supporting this activity. In Germany the XMM-Newton project is supported by the Bundesministerium für Wirtschaft und Technologie/Deutsches Zentrum für Luft und Raumfahrt e.V. (DLR) and the Max Planck Society. Part of this work was supported by the DLR project numbers 50 OX 0201, 50 OX 0001, and 50 OG 0502. The Italian team acknowledges financial support from the Agenzia Spaziale Italiana (ASI), the Ministero dell’ Istruzione, Università e Ricerca (MIUR) and the Istituto Nazionale di Astrofisica (INAF) over the last years; they are currently supported by the grant PRIN-MIUR 2006-02-5203 and by the ASI grants n.I/088/06/0 and n.I/023/05/0. UK authors thank STFC for financial support.

Published
2009

14. The XMM-Newton serendipitous survey

Author

Watson, M. G., Auguères, J.-L., Ballet, J., Barcons, Xavier, Barret, Didier, Boer, M., Boller, Th., Bromage, G. E., Brunner, H., Carrera, Francisco J., Cropper, M. S., Denby, M., Ehle, M., Elvis, M., Fabian, A. C., Freyberg, M. J., Guillout, P., Hameury, J.-M., Hasinger, Günther, Hinshaw, D. A., Maccacaro, T., Mason, Keith O., McMahon, Richard G., Michel, L., Mirioni, L., Mittaz, J. P. D., Motch, C., Olive, J.-F., Osborne, J. P., Page, C. G., Pakull, M. W., Perry, B. H., Pierre, M., Pietsch, W., Pye, J. P., Read, A. M., Roberts, T. P., Rosen, Simon, Sauvageot, J.-L., Schwope, A., Sekiguchi, Kazuhiro, Stewart, G. C., Stewart, Ian M., Valtchanov, Iván, Ward, M. J., Warwick, R. S., West, R. G., White, N. E., Worrall, D. M., Centre National D'Etudes Spatiales (France), German Centre for Air and Space Travel, Royal Astronomical Society, Agenzia Spaziale Italiana, and National Aeronautics and Space Administration (US)

Subjects
general [X-rays], Surveys, data analysis [Methods], stars [X-rays], galaxies [X-rays]
Abstract

This paper describes the performance of XMM-Newton for serendipitous surveys and summarises the scope and potential of the XMM-Newton Serendipitous Survey. The role of the Survey Science Centre (SSC) in the XMM-Newton project is outlined. The SCC's follow-up and identification programme for the XMM-Newton serendipitous survey is described together with the presentation of some of the first results. Support for the SSC project provided by the following agencies: Deutsches Zentrum f¨ur Luft- und Raumfahrt (DLR) under grant numbers 50 OR 9908 0 & 50 OX 9701 5; PPARC (UK); CNES (France) and NASA (via the HEASARC). TM thanks the Italian Space Agency (ASI) for financial support.

Published
2001
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15. The XMM-Newton serendipitous survey

Author

Max Planck Society, Ministero dell'Istruzione, dell'Università e della Ricerca, Istituto Nazionale di Astrofisica, Agenzia Spaziale Italiana, German Centre for Air and Space Travel, Centre National D'Etudes Spatiales (France), Federal Ministry of Economics and Technology (Germany), Science and Technology Facilities Council (UK), Ministerio de Educación y Ciencia (España), Watson, Mike, Schröder, A. C., Fyfe, D., Page, C. G., Lamer, Georg, Mateos, Silvia, Pye, J. P., Sakano, M., Rosen, Simon, Ballet, Jean, Barcons, Xavier, Barret, Didier, Boller, Th., Brunner, H., Brusa, M., Caccianiga, A., Carrera, Francisco J., Ceballos, María Teresa, Della Ceca, R., Denby, M., Denkinson, G., Dupuy, S., Farrell, S. A., Fraschetti, F., Freyberg, Michael, Guillout, P., Hambaryan, V., Maccacaro, T., Mathiesen, B., McMahon, Richard G., Michel, Laurent, Motch, Christian, Osborne, J. P., Page, Matt, Pakull, M. W., Pietsch, W., Saxton, R. D., Schwope, Axel, Severgnini, P., Simpson, M., Sironi, G., Stewart, G. C., Stewart, Ian M., Stobbart, A.-M., Tedds, J. A., Warwick, R. S., Webb, Natalie A., West, R. G., Worrall, D. M., Yuan, W., Max Planck Society, Ministero dell'Istruzione, dell'Università e della Ricerca, Istituto Nazionale di Astrofisica, Agenzia Spaziale Italiana, German Centre for Air and Space Travel, Centre National D'Etudes Spatiales (France), Federal Ministry of Economics and Technology (Germany), Science and Technology Facilities Council (UK), Ministerio de Educación y Ciencia (España), Watson, Mike, Schröder, A. C., Fyfe, D., Page, C. G., Lamer, Georg, Mateos, Silvia, Pye, J. P., Sakano, M., Rosen, Simon, Ballet, Jean, Barcons, Xavier, Barret, Didier, Boller, Th., Brunner, H., Brusa, M., Caccianiga, A., Carrera, Francisco J., Ceballos, María Teresa, Della Ceca, R., Denby, M., Denkinson, G., Dupuy, S., Farrell, S. A., Fraschetti, F., Freyberg, Michael, Guillout, P., Hambaryan, V., Maccacaro, T., Mathiesen, B., McMahon, Richard G., Michel, Laurent, Motch, Christian, Osborne, J. P., Page, Matt, Pakull, M. W., Pietsch, W., Saxton, R. D., Schwope, Axel, Severgnini, P., Simpson, M., Sironi, G., Stewart, G. C., Stewart, Ian M., Stobbart, A.-M., Tedds, J. A., Warwick, R. S., Webb, Natalie A., West, R. G., Worrall, D. M., and Yuan, W.

Abstract

[Aims]: Pointed observations with XMM-Newton provide the basis for creating catalogues of X-ray sources detected serendipitously in each field. This paper describes the creation and characteristics of the 2XMM catalogue. [Methods]: The 2XMM catalogue has been compiled from a new processing of the XMM-Newton EPIC camera data. The main features of the processing pipeline are described in detail. [Results]: The catalogue, the largest ever made at X-ray wavelengths, contains 246 897 detections drawn from 3491 public XMM-Newton observations over a 7-year interval, which relate to 191 870 unique sources. The catalogue fields cover a sky area of more than 500 deg2. The non-overlapping sky area is ∼360 deg2 (∼1% of the sky) as many regions of the sky are observed more than once by XMM-Newton. The catalogue probes a large sky area at the flux limit where the bulk of the objects that contribute to the X-ray background lie and provides a major resource for generating large, well-defined X-ray selected source samples, studying the X-ray source population and identifying rare object types. The main characteristics of the catalogue are presented, including its photometric and astrometric properties.

Published
2009

16. The XMM-Newton serendipitous survey. IV. Optical identification of the XMM-Newton medium sensitivity survey (XMS)

Author

Barcons, Xavier, Carrera, Francisco J., Ceballos, María Teresa, Page, Matt, Bussons-Gordo, Javier, Corral, Amalia, Ebrero, Jacobo, Mateos, Silvia, Tedds, J. A., Watson, Mike, Baskill, D., Birkinshaw, M., Boller, Th., Borisov, N., Bremer, M., Bromage, G. E., Brunner, H., Caccianiga, A., Crawford, C. S., Cropper, M. S., Della Ceca, R., Derry, P., Fabian, Andrew C., Guillout, P., Hashimoto, Y., Hasinger, Günther, Hassall, B. J. M., Lamer, Georg, Loaring, N. S., Maccacaro, T., Mason, Keith O., McMahon, Richard G., Mirioni, L., Mittaz, J. P. D., Motch, Christian, Negueruela, I., Osborne, J. P., Panessa, Francesca, Pèrez-Fournon, Ismael, Pye, J. P., Roberts, T. P., Rosen, Simon, Schartel, N., Schurch, N., Schwope, Axel, Severgnini, P., Sharp, R., Stewart, G. C., Szokoly, G., Ullán, A., Ward, M. J., Warwick, R. S., Wheatley, P. J., Webb, Natalie A., Worrall, D. M., Yuan, W., Ziaeepour, H., Barcons, Xavier, Carrera, Francisco J., Ceballos, María Teresa, Page, Matt, Bussons-Gordo, Javier, Corral, Amalia, Ebrero, Jacobo, Mateos, Silvia, Tedds, J. A., Watson, Mike, Baskill, D., Birkinshaw, M., Boller, Th., Borisov, N., Bremer, M., Bromage, G. E., Brunner, H., Caccianiga, A., Crawford, C. S., Cropper, M. S., Della Ceca, R., Derry, P., Fabian, Andrew C., Guillout, P., Hashimoto, Y., Hasinger, Günther, Hassall, B. J. M., Lamer, Georg, Loaring, N. S., Maccacaro, T., Mason, Keith O., McMahon, Richard G., Mirioni, L., Mittaz, J. P. D., Motch, Christian, Negueruela, I., Osborne, J. P., Panessa, Francesca, Pèrez-Fournon, Ismael, Pye, J. P., Roberts, T. P., Rosen, Simon, Schartel, N., Schurch, N., Schwope, Axel, Severgnini, P., Sharp, R., Stewart, G. C., Szokoly, G., Ullán, A., Ward, M. J., Warwick, R. S., Wheatley, P. J., Webb, Natalie A., Worrall, D. M., Yuan, W., and Ziaeepour, H.

Abstract

[Aims] X-ray sources at intermediate fluxes (a few x 10-14 erg cm-2 s-1) with a sky density of ~100 deg-2 are responsible for a significant fraction of the cosmic X-ray background at various energies below 10 keV. The aim of this paper is to provide an unbiased and quantitative description of the X-ray source population at these fluxes and in various X-ray energy bands., [Methods] We present the XMM-Newton Medium sensitivity Survey (XMS), including a total of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton target fields. The XMS comprises four largely overlapping source samples selected at soft (0.5-2 keV), intermediate (0.5-4.5 keV), hard (2-10 keV) and ultra-hard (4.5-7.5 keV) bands, the first three of them being flux-limited., [Results] We report on the optical identification of the XMS samples, complete to 85-95%. At the flux levels sampled by the XMS we find that the X-ray sky is largely dominated by Active Galactic Nuclei. The fraction of stars in soft X-ray selected samples is below 10%, and only a few per cent for hard selected samples. We find that the fraction of optically obscured objects in the AGN population stays constant at around 15-20% for soft and intermediate band selected X-ray sources, over 2 decades of flux. The fraction of obscured objects amongst the AGN population is larger (~35-45%) in the hard or ultra-hard selected samples, and constant across a similarly wide flux range. The distribution in X-ray-to-optical flux ratio is a strong function of the selection band, with a larger fraction of sources with high values in hard selected samples. Sources with X-ray-to-optical flux ratios in excess of 10 are dominated by obscured AGN, but with a significant contribution from unobscured AGN.

Published
2007

18. The XMM-Newton serendipitous survey

Author

Centre National D'Etudes Spatiales (France), German Centre for Air and Space Travel, Royal Astronomical Society, Agenzia Spaziale Italiana, National Aeronautics and Space Administration (US), Watson, M. G., Auguères, J.-L., Ballet, J., Barcons, Xavier, Barret, Didier, Boer, M., Boller, Th., Bromage, G. E., Brunner, H., Carrera, Francisco J., Cropper, M. S., Denby, M., Ehle, M., Elvis, M., Fabian, A. C., Freyberg, M. J., Guillout, P., Hameury, J.-M., Hasinger, Günther, Hinshaw, D. A., Maccacaro, T., Mason, Keith O., McMahon, Richard G., Michel, L., Mirioni, L., Mittaz, J. P. D., Motch, C., Olive, J.-F., Osborne, J. P., Page, C. G., Pakull, M. W., Perry, B. H., Pierre, M., Pietsch, W., Pye, J. P., Read, A. M., Roberts, T. P., Rosen, Simon, Sauvageot, J.-L., Schwope, A., Sekiguchi, Kazuhiro, Stewart, G. C., Stewart, Ian M., Valtchanov, Iván, Ward, M. J., Warwick, R. S., West, R. G., White, N. E., Worrall, D. M., Centre National D'Etudes Spatiales (France), German Centre for Air and Space Travel, Royal Astronomical Society, Agenzia Spaziale Italiana, National Aeronautics and Space Administration (US), Watson, M. G., Auguères, J.-L., Ballet, J., Barcons, Xavier, Barret, Didier, Boer, M., Boller, Th., Bromage, G. E., Brunner, H., Carrera, Francisco J., Cropper, M. S., Denby, M., Ehle, M., Elvis, M., Fabian, A. C., Freyberg, M. J., Guillout, P., Hameury, J.-M., Hasinger, Günther, Hinshaw, D. A., Maccacaro, T., Mason, Keith O., McMahon, Richard G., Michel, L., Mirioni, L., Mittaz, J. P. D., Motch, C., Olive, J.-F., Osborne, J. P., Page, C. G., Pakull, M. W., Perry, B. H., Pierre, M., Pietsch, W., Pye, J. P., Read, A. M., Roberts, T. P., Rosen, Simon, Sauvageot, J.-L., Schwope, A., Sekiguchi, Kazuhiro, Stewart, G. C., Stewart, Ian M., Valtchanov, Iván, Ward, M. J., Warwick, R. S., West, R. G., White, N. E., and Worrall, D. M.

Abstract

This paper describes the performance of XMM-Newton for serendipitous surveys and summarises the scope and potential of the XMM-Newton Serendipitous Survey. The role of the Survey Science Centre (SSC) in the XMM-Newton project is outlined. The SCC's follow-up and identification programme for the XMM-Newton serendipitous survey is described together with the presentation of some of the first results.

Published
2001

20. An X-ray view of Mrk 705

Author

Gallo, L. C., primary, Balestra, I., additional, Costantini, E., additional, Boller, Th., additional, Burwitz, V., additional, Ferrero, E., additional, and Mathur, S., additional

Published
2005
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29. XMM-Newton observations of Markarian 421

Author

Brinkmann, W., primary, Sembay, S., additional, Griffiths, R. G., additional, Branduardi-Raymont, G., additional, Gliozzi, M., additional, Boller, Th., additional, Tiengo, A., additional, Molendi, S., additional, and Zane, S., additional

Published
2001
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30. The XMM-Newton Serendipitous Survey

Author

Watson, M. G., primary, Auguères, J.-L., additional, Ballet, J., additional, Barcons, X., additional, Barret, D., additional, Boer, M., additional, Boller, Th., additional, Bromage, G. E., additional, Brunner, H., additional, Carrera, F. J., additional, Cropper, M. S., additional, Denby, M., additional, Ehle, M., additional, Elvis, M., additional, Fabian, A. C., additional, Freyberg, M. J., additional, Guillout, P., additional, Hameury, J.-M., additional, Hasinger, G., additional, Hinshaw, D. A., additional, Maccacaro, T., additional, Mason, K. O., additional, McMahon, R. G., additional, Michel, L., additional, Mirioni, L., additional, Mittaz, J. P., additional, Motch, C., additional, Olive, J.-F., additional, Osborne, J. P., additional, Page, C. G., additional, Pakull, M., additional, Perry, B. H., additional, Pierre, M., additional, Pietsch, W., additional, Pye, J. P., additional, Read, A. M., additional, Roberts, T. P., additional, Rosen, S. R., additional, Sauvageot, J.-L., additional, Schwope, A. D., additional, Sekiguchi, K., additional, Stewart, G. C., additional, Stewart, I., additional, Valtchanov, I., additional, Ward, M. J., additional, Warwick, R. S., additional, West, R. G., additional, White, N. E., additional, and Worrall, D. M., additional

Published
2001
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35. The Hamburg/RASS Catalogue of optical identifications

Author

Bade, N., primary, Engels, D., additional, Voges, W., additional, Beckmann, V., additional, Boller, Th., additional, Cordis, L., additional, Dahlem, M., additional, Englhauser, J., additional, Molthagen, K., additional, Nass, P., additional, Studt, J., additional, and Reimers, D., additional

Published
1998
Full Text
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