X-ray properties of the quasar HE0450-2958

Abstract

We present an {\it XMM-Newton} EPIC observation of HE0450-2958 which may be a ``naked''quasar as suggested by Magain et al. The \xmm EPIC spectra show a substantial soft X-ray excess, a steep photon index, as well as marginal evidence for a weak Fe K$\alpha$ line. The X-ray absorption is consistent with the galactic level. The 0.3-10 keV EPIC spectra can be fitted by a power law plus a blackbody model, however, the fit by the relativistically blurred photoionized disc reflection is better. We estimate the black hole mass of $2_{-1.3}^{+7}\times 10^7{M}_{\odot }$ from the X-ray variability. This broadly agrees with the value derived from the optical \hb line width. These results support a high-state Seyfert galaxy of the source. HE0450-2958 shares similar properties of transitionary objects from ultra-luminous infrared galaxies to quasars. We suggest that HE0450-2958 is just in the beginning of an optical quasar window.

23 pages, 8 figures, AJ in press

References in corpus (50)

• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background
• A Unified Model for the Evolution of Galaxies and Quasars
• The obscured growth of massive black holes
• An X-ray spectral study of 24 type-1 AGN
• On the black hole - bulge mass relation in active and inactive galaxies
• An Explanation for the soft X-ray excess in AGN
• The XMM-Newton view of PG quasars I. X-ray continuum and absorption
• Is the soft excess in AGN real?
• The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei
• A median redshift of 2.4 for galaxies bright at submillimetre wavelengths
• X-ray Spectra of a large sample of Quasars with ASCA
• A Physical Model for the Origin of Quasar Lifetimes
• Cooling flows and quasars: II. Detailed models of feedback modulated accretion flows
• Quasi-Stellar Objects, Ultraluminous IR Galaxies, and Mergers
• A Comprehensive Spectral and Variability Study of Narrow-Line Seyfert 1 Galaxies Observed by ASCA: I. Observations and Time Series Analysis
• Slim Disk Model for Soft X-Ray Excess and Variability of Narrow-Line Seyfert 1 Galaxies
• A comparison of the hard ASCA spectral slopes of broad and narrow-line Seyfert 1 galaxies
• Thermal Instability and Photoionized X-ray Reflection in Accretion Disks
• The Hard X-ray Spectral Slope as an Accretion-Rate Indicator in Radio-Quiet Active Galactic Nuclei
• Rapid Growth of Black Holes in Massive Star-Forming Galaxies
• X-ray Observations of Optically-Selected, Radio-Quiet Quasars I: The ASCA results
• A Composite Extreme Ultraviolet QSO Spectrum from the Far Ultraviolet Spectroscopic Explorer
• On X-ray Variability in Seyfert Galaxies
• Hot Disk Corona and Magnetic Turbulence in Radio-Quiet Active Galactic Nuclei: Observational Constraints
• The scaling of the X-ray variability with black hole mass in AGN
• Photon Bubbles in Accretion Discs
• The relationship between X-ray variability amplitude and black hole mass in active galactic nuclei
• The XMM-Newton and BeppoSAX view of the Ultra Luminous Infrared Galaxy MKN 231
• Narrow Iron K$\alpha$ Lines in Active Galactic Nuclei: Evolving Populations?
• Extreme Slim Accretion Disks and Narrow Line Seyfert 1 Galaxies: the Nature of the soft X-ray Hump
• On the origin of the Fe K-alpha line cores in Active Galactic Nuclei
• Evidence for Ionised Accretion Discs in Five Narrow-Line Seyfert 1 Galaxies
• On X-ray variability in narrow line and broad line AGNs
• The Physical Connections Among IR QSOs, PG QSOs and Narrow-Line Seyfert 1 Galaxies
• Discovery of a bright quasar without a massive host galaxy
• Confirming the high velocity outflow in PG 1211+143
• Fe K emission and absorption features in XMM-Newton spectra of Mkn 766 - evidence for reprocessing in flare ejecta
• The nature of the HE0450-2958 System
• The relationship between the X-ray variability and the central black hole mass
• BeppoSAX average spectra of Seyfert galaxies
• Possible evidence for the ejection of a supermassive black hole from an ongoing merger of galaxies
• Three-Body Kick to a Bright Quasar out of Its Galaxy During a Merger
• Type I ULIRGs: Transition Stage from ULIRGs to QSOs
• X-ray Underluminous Active Galactic Nuclei Relative to Broad Emission Lines in Ultraluminous Infrared Galaxies
• The Spectral Energy Distribution of the Seyfert galaxy Ton S180
• The origin of optical emission from super-Eddington accreting Active Galactic Nuclei: the case of Ton S 180
• X-ray emission from GPS/CSS sources
• Big Blue Bump and Transient Active Regions in Seyfert Galaxies

Cited by in corpus (11)

• CAIXA: a catalogue of AGN in the XMM-Newton archive III. Excess Variance Analysis
• Recoiling Black Holes in Quasars
• Calibrating the correlation between black hole mass and X-ray variability amplitude: X-ray only black hole mass estimates for active galactic nuclei and ultra-luminous X-ray sources
• X-ray spectral variability in PG1535+547: the changing-look of a 'soft X-ray weak' AGN
• A comparison of hard X-ray photon indices and iron \ka emission lines in X-ray luminous narrow- and broad-line Seyfert 1 galaxies
• Hard X-ray photon index as an indicator of bolometric correction in active galactic nuclei
• GEMINI 3D spectroscopy of BAL+IR+Fe II QSOs: II. IRAS 04505-2958 an explosive QSO with hypershell and a new scenario for galaxy formation and galaxy end
• The QSO HE0450-2958: Scantily dressed or heavily robed? A normal quasar as part of an unusual ULIRG
• Slit and integral-field optical spectroscopy of the enigmatic quasar HE0450-2958
• Near-IR observations of the HE0450-2958 system: discovery of a second AGN?
• Periods of the Long-Term Variability of the Blazar 0716+714 and Their Inter-Correlations in a Helical Jet Model