Detection of Absorption Features in the X-Ray Spectrum of the Narrow-Line Quasar PG 1404+226: Possible Evidence of Accretion Disk Winds

Dasgupta, Surajit; Rao, A. R.; Dewangan, G. C.; Agrawal, V. K.

doi:10.1086/427799

Cited by 20 publications

(22 citation statements)

References 9 publications

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“…Recently, Dasgupta et al (2004) reported the discovery of analogous features in the XMM spectrum of the narrow emission line quasar PG 1404+226. Similar results for this object and two other NLS1 galaxies, 1H 0707-495 and IRAS 13224-3809, were presented earlier from ASCA observations by Leighly et al (1997).…”

Section: Introductionmentioning

confidence: 97%

PG 0844+349 revisited – is there any outflow?

Brinkmann

Wang

Grupe

et al. 2006

A&A

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Aims. The detection of high velocity absorption lines from highly ionized material has been reported recently from the X-ray spectrum of the narrow line Seyfert 1 galaxy PG 0844+349 and were interpreted as a relativistic outflow from the source. We studied this outflow because it would have important implications for our understanding of narrow line Seyfert 1 galaxies. Methods. To address the reality of these absorption features, we analyzed a long XMM observation with the MOS cameras on this object. Results. We did not detect the absorption lines claimed, and a re-analysis of the previous data set with the most recent detector calibrations did not confirm the earlier results. The X-ray spectra can be well modeled with a power law plus a bremsstrahlung component. With this description, the soft and the harder 2−10 keV X-ray flux changed by a similar fraction ( 25%) between the two observations with only small changes in the spectral form. An analysis of the hardness ratio variations within a single observation does not show any strong correlation between the hardness ratio and the continuum luminosity and we do not detect substantial lags between the hard and soft band fluxes.

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Section: Introductionmentioning

confidence: 97%

PG 0844+349 revisited – is there any outflow?

Brinkmann

Wang

Grupe

et al. 2006

A&A

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“…The geometry and the position of these warm absorbers are uncertain. Some AGNs show evidence for highvelocity outflows (e.g., Chartas et al 2002;Reeves et al 2003Reeves et al , 2008Dadina & Cappi 2004;Dasgupta et al 2005;Markowitz et al 2006;Braito et al 2007;Cappi et al 2009). Moreover with the aid of high-resolution, narrowband imaging (or integral field spectroscopy) and Hubble Space Telescope imaging, it was possible to identify extended regions of highly ionized material around the central engine also known as "ionization cones" with a size of a few up to 15-20 kpc which suggests an anisotropic escape of photons from AGNs confined to a cone by a dusty torus (Wilson et al 1993).…”

Section: Introductionmentioning

confidence: 99%

Spectral Variability of Iras 18325-5926 and Constraints on the Geometry of the Scattering Medium

Tripathi

Misra

Dewangan

et al. 2013

ApJ

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We analyze Suzaku and XMM-Newton data of the highly variable Seyfert 2, IRAS 18325-5926. The spectra of the source are well modeled as a primary component described as an absorbed power law and a secondary power-law component which is consistent with being scattered emission from an on-axis extended highly ionized medium. We show that while the primary component varies on a wide range of timescales from 10 4 -10 8 s, the scattered emission is variable only on timescales longer than 10 5 s. This implies that the extent of the scattering medium is greater than 10 16 cm. The ratio of the scattered to primary flux (∼0.03) implies a column density for the scattering medium to be ∼10 23 cm −2 . We argue that for such a medium to be highly ionized it must be located less than 10 17 cm from the X-ray source. Thus, we localize the position and extent of scattering region to be ∼a few ×10 16 cm, with an average particle density of ∼10 6 cm −3 . We consider the physical interpretation of these results, and as an aside we confirm the presence of a broad iron line emission in both the XMM-Newton and Suzaku observations.

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“…In some AGNs, high-velocity outflows have also been detected (e.g., Reeves et al 2003; Dadina & Cappi 2004;Dasgupta et al 2005;Braito et al 2007). The resulting mass outflow rate can be a substantial fraction of the accretion rate required to power the AGN.…”

Section: Introductionmentioning

confidence: 99%

X-RAY WARM ABSORPTION AND EMISSION IN THE POLAR-SCATTERED SEYFERT 1 GALAXY Mrk 704

Laha¹,

Dewangan²,

Kembhavi³

2011

ApJ

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We present a detailed study of the ionized environment of the Seyfert 1 galaxy Mrk 704 using medium-and high-resolution X-ray spectra obtained with a long XMM-Newton observation. The 0.3-10 keV continuum, well described by a power law (Γ ≈ 1.86) and two blackbodies (kT ≈ 0.085 and 0.22 keV), is found to be affected by a neutral partial covering absorption (N H ≈ 10 23 cm −2 , covering fraction ≈0.22) and two warm absorber components. We identify a low-ionization, ξ ∼ 20 erg cm s −1 , and high outflow velocity, v ∼ 1350 km s −1 , phase producing the O vi and Fe M-shell unresolved-transition array. An additional high-ionization warm absorbing phase with ξ ∼ 500 erg cm s −1 and low outflow velocity, v ∼ 540 km s −1 , gives rise to absorption features due to O vii, O viii, N vi, N vii, and C vi. We also detected weak emission lines of He-like triplets from O vii and N vi ions, thus making Mrk 704 a Seyfert 1 galaxy with both warm absorption and emission. The emission lines are well described by two warm emitting, photoionized media with different densities but comparable ξ , suggesting discrete clouds of warm emission. The high-density phase (n e ∼ 10 13 cm −3 ) responsible for the resonance lines appears to outflow at high velocity ∼5000 km s −1 . The low-velocity, low-density phase is likely similar to the X-ray line emitting regions found in Seyfert 2 galaxies. The physical conditions of warm emitters and warm absorbers suggest that these clouds are similar but observed in absorption along our line of sight and in emission at other lines of sight. The unique line of sight passing close to the torus opening angle is likely responsible for the neutral partial covering absorption and our view of emission lines due to the suppressed continuum in this polar-scattered Seyfert 1 galaxy.

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Detection of Absorption Features in the X-Ray Spectrum of the Narrow-Line Quasar PG 1404+226: Possible Evidence of Accretion Disk Winds

Cited by 20 publications

References 9 publications

PG 0844+349 revisited – is there any outflow?

PG 0844+349 revisited – is there any outflow?

Spectral Variability of Iras 18325-5926 and Constraints on the Geometry of the Scattering Medium

X-RAY WARM ABSORPTION AND EMISSION IN THE POLAR-SCATTERED SEYFERT 1 GALAXY Mrk 704

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