A dataset provided by the European Space Agency

Name: Unabsorbed type 2 Seyfert galaxies: a challenge for Unified Models
Published: 2009-08-23T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	055094
Title	Unabsorbed type 2 Seyfert galaxies: a challenge for Unified Models
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0550940201
DOI	https://doi.org/10.5270/esa-ihmhh8o
Principal Investigator, PI	Dr Stefano Bianchi
Abstract	A campaign of simultaneous X-ray and optical observations of unabsorbed Seyfert2s has already proved successful in the AO-5,leading to the discovery of thefirst true Seyfert 2 without broad line region.We therefore intend to pursueour strategy,proposing to observe with XMM-Newton a sample of bona-fideSeyfert 2 galaxies with no X-ray absorption.The selected sources are aconservative subsample taken from the Panessa & Bassani (2002) sample,includingonly Seyfert 2s where no column density in excess of the Galactic one has everbeen observed in the X-rays,within sensitive limits.The primary goal of thisproposal is to find more objects unabsorbed in the X-rays and without broadoptical lines,which represent a serious challenge to simple AGN Unification Models.
Publications	Simultaneous X-ray and optical observations of true type 2 Seyfert galaxies \|Bianchi Stefano Panessa Francesca et al. \| MNRAS \| 426-3225 \| 2012 \| 2012MNRAS.426.3225B \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.426.3225B Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift \|Yershov V. N. \| Ap&SS \| 354-97 \| 2014 \| 2014Ap&SS.354...97Y \| http://ui.adsabs.harvard.edu/#abs/2014Ap&SS.354...97Y The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch Eric W. \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P Robust constraints on feebly interacting particles using XMM-Newton \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE \|Ma Xiangyao Zhang Yanxia et al. \| AJ \| 168-210 \| 2024 \| 2024AJ....168..210M \| http://ui.adsabs.harvard.edu/#abs/2024AJ....168..210M New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 973-L6 \| 2024 \| 2024ApJ...973L...6D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...973L...6D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2008-08-03T04:30:55Z/2008-08-03T09:29:29Z
Version	21.51_20241115_1113
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2009-08-23T00:00:00Z
Last Update	2026-07-09
Keywords	"broad line region", "seyfert 2s", "bona fide", "XMM-Newton", "sensitive limits", "seyfert galaxy", "unabsorbed seyfert 2s", "bassani 2002 sample", "conservative subsample", "XMM", "xmm newton", "broad optical lines", "unabsorbed type", "proved successful", "column density", "xray absorption", "objects unabsorbed", "unified models"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Stefano Bianchi, 2009, 'Unabsorbed type 2 Seyfert galaxies: a challenge for Unified Models', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-ihmhh8o
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.