X-ray spectral and temporal analysis of Narrow Line Seyfert 1 galaxy Was 61

Abstract

We present an analysis of spectrum and variability of the bright reddened narrow line Seyfert 1 galaxy Was~61 using 90 ks archival {\it XMM-Newton} data. The X-ray spectrum in 0.2-10 keV can be characterized by an absorbed power-law plus soft excess and an Fe K$\alpha$ emission line. The power-law spectral index remains constant during the flux variation. The absorbing material is mildly ionized, with a column density of 3.2$\times$10${}^{21}$ cm${}^{-2}$, and does not appear to vary during the period of the X-ray observation. If the same material causes the optical reddening (E(B-V)$\simeq$0.6 mag), it must be located outside the narrow line region with a dust-to-gas ratio similar to the average Galactic value. We detect significant variations of the Fe K$\alpha$ line during the observational period. A broad Fe K$\alpha$ line at $\simeq$6.7 keV with a width of $\sim$0.6 keV is detected in the low flux segment of the first 40 ks exposure, and is absent in the spectra of other segments; a narrow Fe K$\alpha$ emission line $\sim$6.4 keV with a width of $\sim$0.1 keV is observed in the subsequent 20 ks segment, which has a count rate of 35% higher and is in the next day. We believe this is due to the change in geometry and kinematics of the X-ray emitting corona. The temperature and flux of soft X-ray excess appear to correlate with the flux of the hard power-law component. Comptonization of disc photons by a warm and optically thick inner disk is preferred to interpret the soft excess, rather than the ionized reflection.

References in corpus (76)

• On the Absorption of X-rays in the Interstellar Medium
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• On characterising the variability properties of X-ray light curves from active galaxies
• Active Galactic Nuclei as scaled-up Galactic black holes
• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• Intrinsic disc emission and the Soft X-ray Excess in AGN
• An X-ray spectral study of 24 type-1 AGN
• Broad iron lines in Active Galactic Nuclei
• An Explanation for the soft X-ray excess in AGN
• Is the soft excess in AGN real?
• The nature and origin of Seyfert warm absorbers
• ASCA Observations of Seyfert 1 galaxies: III. The Evidence for Absorption & Emission due to Photoionized Gas
• The Ionized Gas and Nuclear Environment in NGC 3783. I. Time-Averaged 900 ks Chandra Grating Spectroscopy
• Suzaku observations of 'bare' active galactic nuclei
• A rapidly spinning supermassive black hole at the centre of NGC 1365
• XMM-Newton EPIC observations of 21 low-redshift PG quasars
• Understanding X-ray reflection emissivity profiles in AGN: Locating the X-ray source
• CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis
• CAIXA: a catalogue of AGN in the XMM-Newton archive III. Excess Variance Analysis
• Supermassive black holes with high accretion rates in active galactic nuclei: I. First results from a new reverberation mapping campaign
• Broad iron L-line and X-ray reverberation in 1H0707-495
• The Compact, Conical, Accretion-Disk Warm Absorber of the Seyfert 1 Galaxy NGC 4051 and its Implications for IGM-Galaxy Feedback Processes
• The Spin of the Supermassive Black Hole in NGC 3783
• Revealing the Dusty Warm Absorber in MCG--6-30-15 with the Chandra HETG
• The Cores of the Fe K$\alpha$ Lines in Active Galactic Nuclei: an Extended Chandra High Energy Grating Sample
• X-ray reflection in the NLS1 1H 0707-495
• Relativistic iron K X-ray Reverberation in NGC 4151
• Chandra-HETGS Observations of the Brightest Flare Seen from Sgr A*
• A Complete Sample of Soft X-ray Selected AGN: I. The Data
• The Cores of the Fe K Lines in Seyfert I Galaxies Observed by the Chandra High Energy Grating
• X-ray Absorption and Reflection in Active Galactic Nuclei
• Universal spectral shape of high accretion rate AGN
• 1H0707-495 in 2011: An X-ray source within a gravitational radius of the event horizon
• Modelling the broad Fe Kα reverberation in the AGN NGC 4151
• Long-Term X-ray Spectral Variability in Seyfert 1 Galaxies
• Discovery of high-frequency iron K lags in Ark 564 and Mrk 335
• FERO: Finding Extreme Relativistic Objects. I. Statistics of Relativistic Fe Kalpha lines in Radio-Quiet Type 1 AGN
• A Suzaku survey of Fe K lines in Seyfert 1 AGN
• X-ray variability in a complete sample of Soft X-ray selected AGN
• Negative X-ray reverberation time delays from MCG-6-30-15 and Mrk 766
• The Closest Look at 1H0707-495: X-ray Reverberation Lags with 1.3 Ms of Data
• Simultaneous NuSTAR and XMM-Newton 0.5-80 keV spectroscopy of the Narrow Line Seyfert 1 galaxy SWIFT J2127.4+5654
• Anatomy of the AGN in NGC 5548: II. The Spatial, Temporal and Physical Nature of the Outflow from HST/COS Observations
• Suzaku observations of Mrk 335: Confronting partial covering and relativistic reflection
• The Broad-band X-ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation
• Tracing a Disk Wind in NGC 3516
• Can a Dusty Warm Absorber Model Reproduce the Soft X-ray Spectra of MCG-6-30-15 and Mrk 766?
• Are X-ray Emitting Coronae around Super Massive Black Holes Outflowing?
• The Variable X-ray Spectrum of Markarian 766 - II. Time-Resolved Spectroscopy
• A reflection origin for the soft and hard X-ray excess of Ark 120
• Discovery of Fe K-alpha X-ray reverberation around the black holes in MCG-5-23-16 and NGC 7314
• A soft X-ray reverberation lag in the AGN ESO 113-G010
• PG 1211+143: probing high frequency lags in a high mass AGN
• X-Ray Properties of Narrow-Line Seyfert 1 Galaxies with Very Small Broad-Line Widths
• The Black Hole Spin and Soft X-ray Excess of the Luminous Seyfert Galaxy Fairall 9
• Observations of MCG-5-23-16 with Suzaku, XMM-Newton and NuSTAR: Disk tomography and Compton hump reverberation
• X-ray Reverberation close to the black hole in RE J1034+396
• RX J1301.9+2747: A Highly Variable Seyfert Galaxy with Extremely Soft X-ray Emission
• The curious time lags of PG 1244+026: Discovery of the iron K reverberation lag
• A rapidly variable narrow X-ray iron line in Mkn 841
• A Candidate Active Galactic Nucleus with a Pure Soft Thermal X-ray Spectrum
• A comparison of hard X-ray photon indices and iron \ka emission lines in X-ray luminous narrow- and broad-line Seyfert 1 galaxies
• Measuring the Coronal Properties of IC4329A with NuSTAR
• A Physical Model for the X-ray Time Lags of Narrow Line Seyfert Type 1 Active Galactic Nuclei
• X-ray observational signature of a black hole accretion disc in an active galactic nucleus RXJ1633+4718
• Dust reddening in star-forming galaxies
• The broad Fe Kα line and supermassive black holes
• The hard X-ray perspective on the soft X-ray excess
• On the X-ray Baldwin Effect in Active Galactic Nuclei Observed by the Chandra High Energy Grating
• Relativistic Fe K$\alpha$ Line Revealed in the Composite X-ray Spectrum of Narrow Line Seyfert 1 Galaxies --- do their black holes have averagely low or intermediate spins?
• On the variability of the iron line in Mrk 841
• Timescales of Soft X-Ray Variability and Physical Constraints in Agns
• Variable X-ray reflection from 1H~0419--577
• A magnetic reconnection origin for the soft X-ray excess in AGN
• XMM-Newton and Broad Iron Lines
• Condensed Matter Astrophysics: A Prescription for Determining the Species-Specific Composition and Quantity of Interstellar Dust using X-rays

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