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A broadband X-ray view of the NLSy1 1E 0754.6+3928

Identificadores del recurso

Astronomy and Astrophysics 635: A18 (2020)

0004-6361

https://www.aanda.org/articles/aa/full_html/2020/03/aa36701-19/aa36701-19.html

http://hdl.handle.net/20.500.12666/130

10.1051/0004-6361/201936701

1432-0746

Procedencia

(Digital.INTA - Repositorio institucional del INTA)

Ficha

Título:: A broadband X-ray view of the NLSy1 1E 0754.6+3928
Tema:: Galaxies: Active; Galaxies: Seyfert; Quasars: general; X-rays: galaxies
Descripción:: Context. The soft X-ray band of many active galactic nuclei (AGNs) is affected by obscuration due to partially ionised matter crossing our line of sight. In this context, two past XMM-Newton observations that were six months apart and a simultaneous NuSTAR-Swift exposure of the Narrow Line Seyfert 1 galaxy 1E 0754.6+3928, which was approximately eight years later, revealed an intense and variable warm absorber (WA) and hints of additional absorbers in the Fe K alpha band.Aims. We aim to provide the first X-ray characterisation of this AGN by discussing its broadband (0.3-79 keV) spectrum and temporal properties.Methods. We conduct a temporal and spectroscopic analysis on two similar to 10 ks (net exposure) XMM-Newton snapshots performed in April and October 2006. We also study the high energy behaviour of 1E 0754.6+3928 and model its broadband spectrum by using simultaneous Swift-NuSTAR data. Both phenomenological and physically motivated models are tested.Results. We find the presence of flux variability of similar to 150% and 30% for 0.3-2 and 2-10 keV bands, respectively, and spectral changes at months timescales of Delta Gamma similar to 0.4. A reflection component that is consistent with being constant over years and arising from relatively cold material that is far from the central super massive black hole is detected. The main spectral feature shaping the 1E 0754.6+3928 spectrum is a WA. Such a component is persistent over the years and the variability of its ionisation and column density is observed down on months in the ranges 3x10(22)cm(-2)less than or similar to N-H less than or similar to 7.2x10(22)cm(-2) and 1.5 less than or similar to log (xi/erg s(-1) cm) less than or similar to 2.1. Despite the short exposures, we find possible evidence of two additional high-ionisation and high-velocity outflow components in absorption.Conclusions. Our analysis suggests the existence of a complex system of absorbers in 1E 0754.6+3928. Longer exposures are required in order to characterise, on more solid grounds, the absorbers in this AGN.; We thank the referee for her/his suggestions which improved the manuscript. RM thanks Valentina Braito and James Reeves for useful discussions and comments. RM acknowledges support from the Faculty of the European Space Astronomy Centre (ESAC), Fondazione Angelo Della Riccia for financial support and Universite Grenoble Alpes and the high energy SHERPAS group for welcoming him at IPAG. FT acknowledges support by the Programma per Giovani Ricercatori -anno 2014 "Rita Levi Montalcini". Part of this work is based on archival data, software or online services provided by the Space Science Data Center -ASI. SB and AZ acknowledge financial support from ASI under grants ASI-INAF I/037/12/0 and n. 2017-14-H.O. RS acknowledges financial contribution from the agreement ASI-INAF n.2017-14H.0. POP thanks financial support by the french CNES agency. GAM is supported by European Space Agency (ESA) Research Fellowships. This work is based on observations obtained with: the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory and funded by NASA; XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA); With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737).; Peer review
Idioma:: English
Autor/Productor:: Middei, R.; Tombesi, F.; Vagnetti, F.; Serafinelli, R.; Bianchi, S.; Miniutti, G.; Marinucci, A.; Matzeu, G. A.; Petrucci, P. O.; Ursini, F.; Zaino, A.
Editor:: EDP Sciences
Otros colaboradores/productores:: Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737; 0000-0001-9815-9092; Agenzia Spaziale Italiana (ASI); Istituto Nazionale Astrofisica (INAF); European Space Agency (ESA)
Derechos:: Attribution-NonCommercial-NoDerivatives 4.0 International; © ESO 2020; https://creativecommons.org/licenses/by-nc-nd/4.0/; info:eu-repo/semantics/openAccess
Fecha:: 2021-03-24T11:41:05Z; 2020-02-28
Tipo de recurso:: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; http://purl.org/coar/resource_type/c_6501
Formato:: application/pdf

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1. < dc:title > A broadband X-ray view of the NLSy1 1E 0754.6+3928 </ dc:title >
2. < dc:creator > Middei, R. </ dc:creator >
3. < dc:creator > Tombesi, F. </ dc:creator >
4. < dc:creator > Vagnetti, F. </ dc:creator >
5. < dc:creator > Serafinelli, R. </ dc:creator >
6. < dc:creator > Bianchi, S. </ dc:creator >
7. < dc:creator > Miniutti, G. </ dc:creator >
8. < dc:creator > Marinucci, A. </ dc:creator >
9. < dc:creator > Matzeu, G. A. </ dc:creator >
10. < dc:creator > Petrucci, P. O. </ dc:creator >
11. < dc:creator > Ursini, F. </ dc:creator >
12. < dc:creator > Zaino, A. </ dc:creator >
13. < dc:contributor > Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737 </ dc:contributor >
14. < dc:contributor > 0000-0001-9815-9092 </ dc:contributor >
15. < dc:contributor > Agenzia Spaziale Italiana (ASI) </ dc:contributor >
16. < dc:contributor > Istituto Nazionale Astrofisica (INAF) </ dc:contributor >
17. < dc:contributor > European Space Agency (ESA) </ dc:contributor >
18. < dc:subject > Galaxies: Active </ dc:subject >
19. < dc:subject > Galaxies: Seyfert </ dc:subject >
20. < dc:subject > Quasars: general </ dc:subject >
21. < dc:subject > X-rays: galaxies </ dc:subject >
22. < dc:description > Context. The soft X-ray band of many active galactic nuclei (AGNs) is affected by obscuration due to partially ionised matter crossing our line of sight. In this context, two past XMM-Newton observations that were six months apart and a simultaneous NuSTAR-Swift exposure of the Narrow Line Seyfert 1 galaxy 1E 0754.6+3928, which was approximately eight years later, revealed an intense and variable warm absorber (WA) and hints of additional absorbers in the Fe K alpha band.Aims. We aim to provide the first X-ray characterisation of this AGN by discussing its broadband (0.3-79 keV) spectrum and temporal properties.Methods. We conduct a temporal and spectroscopic analysis on two similar to 10 ks (net exposure) XMM-Newton snapshots performed in April and October 2006. We also study the high energy behaviour of 1E 0754.6+3928 and model its broadband spectrum by using simultaneous Swift-NuSTAR data. Both phenomenological and physically motivated models are tested.Results. We find the presence of flux variability of similar to 150% and 30% for 0.3-2 and 2-10 keV bands, respectively, and spectral changes at months timescales of Delta Gamma similar to 0.4. A reflection component that is consistent with being constant over years and arising from relatively cold material that is far from the central super massive black hole is detected. The main spectral feature shaping the 1E 0754.6+3928 spectrum is a WA. Such a component is persistent over the years and the variability of its ionisation and column density is observed down on months in the ranges 3x10(22)cm(-2)less than or similar to N-H less than or similar to 7.2x10(22)cm(-2) and 1.5 less than or similar to log (xi/erg s(-1) cm) less than or similar to 2.1. Despite the short exposures, we find possible evidence of two additional high-ionisation and high-velocity outflow components in absorption.Conclusions. Our analysis suggests the existence of a complex system of absorbers in 1E 0754.6+3928. Longer exposures are required in order to characterise, on more solid grounds, the absorbers in this AGN. </ dc:description >
23. < dc:description > We thank the referee for her/his suggestions which improved the manuscript. RM thanks Valentina Braito and James Reeves for useful discussions and comments. RM acknowledges support from the Faculty of the European Space Astronomy Centre (ESAC), Fondazione Angelo Della Riccia for financial support and Universite Grenoble Alpes and the high energy SHERPAS group for welcoming him at IPAG. FT acknowledges support by the Programma per Giovani Ricercatori -anno 2014 "Rita Levi Montalcini". Part of this work is based on archival data, software or online services provided by the Space Science Data Center -ASI. SB and AZ acknowledge financial support from ASI under grants ASI-INAF I/037/12/0 and n. 2017-14-H.O. RS acknowledges financial contribution from the agreement ASI-INAF n.2017-14H.0. POP thanks financial support by the french CNES agency. GAM is supported by European Space Agency (ESA) Research Fellowships. This work is based on observations obtained with: the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory and funded by NASA; XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA); With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737). </ dc:description >
24. < dc:description > Peer review </ dc:description >
25. < dc:date > 2021-03-24T11:41:05Z </ dc:date >
26. < dc:date > 2021-03-24T11:41:05Z </ dc:date >
27. < dc:date > 2020-02-28 </ dc:date >
28. < dc:type > info:eu-repo/semantics/article </ dc:type >
29. < dc:type > info:eu-repo/semantics/publishedVersion </ dc:type >
30. < dc:type > http://purl.org/coar/resource_type/c_6501 </ dc:type >
31. < dc:identifier > Astronomy and Astrophysics 635: A18 (2020) </ dc:identifier >
32. < dc:identifier > 0004-6361 </ dc:identifier >
33. < dc:identifier > https://www.aanda.org/articles/aa/full_html/2020/03/aa36701-19/aa36701-19.html </ dc:identifier >
34. < dc:identifier > http://hdl.handle.net/20.500.12666/130 </ dc:identifier >
35. < dc:identifier > 10.1051/0004-6361/201936701 </ dc:identifier >
36. < dc:identifier > 1432-0746 </ dc:identifier >
37. < dc:language > eng </ dc:language >
38. < dc:rights > Attribution-NonCommercial-NoDerivatives 4.0 International </ dc:rights >
39. < dc:rights > © ESO 2020 </ dc:rights >
40. < dc:rights > https://creativecommons.org/licenses/by-nc-nd/4.0/ </ dc:rights >
41. < dc:rights > info:eu-repo/semantics/openAccess </ dc:rights >
42. < dc:format > application/pdf </ dc:format >
43. < dc:publisher > EDP Sciences </ dc:publisher >
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