A Suzaku sample of unabsorbed narrow-line and broad-line Seyfert 1 galaxies – I. X-ray spectral properties

Waddell, Sophia G. H.; Gallo, Luigi

doi:10.1093/mnras/staa2783

Cited by 27 publications

(29 citation statements)

References 132 publications

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“…We have detected prominent Compton hump at energies E > 10 keV with the Suzaku observation (in 2009). (Waddell & Gallo 2020) and (Rivers et al 2011) using the same observational data from Suzaku detected the compton hump. The reflection parameter of the pexrav model obtained in our work (R = 0.17 ± 0.03) is similar to that obtained by Waddell & Gallo (2020), but is lower than that obtained by Rivers et al (2011), which is R = 0.69 ± 0.05.…”

Section: Discussionmentioning

confidence: 91%

“…(Waddell & Gallo 2020) and (Rivers et al 2011) using the same observational data from Suzaku detected the compton hump. The reflection parameter of the pexrav model obtained in our work (R = 0.17 ± 0.03) is similar to that obtained by Waddell & Gallo (2020), but is lower than that obtained by Rivers et al (2011), which is R = 0.69 ± 0.05. With the more recent XMM-Newton and NuSTAR observations in 2016, we could only provide an upper limit on the normalization of the scattering model, indicating a probable absence of the Compton hump.…”

Section: Discussionmentioning

confidence: 91%

“…Previous studies on this source have detected a prominent Compton hump at energies E > 10 keV in the 2009 Suzaku spectra (Rivers et al 2011;Waddell & Gallo 2020). This is a bare Seyfert galaxy and has exhibited a remarkably stable power law slope (Γ ∼ 1.80) in the last ∼ 30 years (Ghosh & Soundararajaperumal 1992;Weaver et al 1995;Rivers et al 2011).…”

Section: Introductionmentioning

confidence: 80%

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A Weakening Compton Hump and Soft X-Ray Excess Detected in the Seyfert 1 Galaxy MCG –02–58–22

Laha

Ghosh

2021

ApJ

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We have carried out an extensive X-ray spectral study of the bare Seyfert-1 galaxy MCG -02-58-22 to ascertain the nature of the X-ray reprocessing media, using observations from Suzaku (2009) and simultaneous observations from XMM-Newton and NuSTAR (2016) . The most significant results of our investigation are: 1. The primary X-ray emission from the corona is constant in these observations, both in terms of the power law slope (Γ = 1.80) and luminosity (L 2−10 keV = 2.55 × 10 44 erg s −1 ). 2. The soft excess flux decreased by a factor of two in 2016, the Compton hump weakened/vanished in 2016, and the narrow FeKα emission line became marginally broad (σ = 0.35 ± 0.08 keV) and its flux doubled in 2016. 3. From physical model fits we find that the normalization of the narrow component of the FeKα line does not change in the two epochs, although the Compton hump vanishes in the same time span. Since the primary X-ray continuum does not change, we presume that any changes in the reprocessed emission must arise due to changes in the reprocessing media. Our primary conclusions are: A. The vanishing of the Compton hump in 2016 can probably be explained by a dynamic clumpy torus which is infalling/outflowing, or by a polar torus wind. B. The torus in this AGN possibly has two structures: an equatorial toroidal disk (producing the narrow FeKα emission) and a polar component (producing the variable Compton hump), C. The reduction of the soft-excess flux by half and increase in the FeKα flux by a factor of two in the same period cannot be adequately explained by ionized disk reflection model alone.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 80%

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A Weakening Compton Hump and Soft X-Ray Excess Detected in the Seyfert 1 Galaxy MCG –02–58–22

Laha

Ghosh

2021

ApJ

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“…Naturally with the NlSy1 galaxies occupying extreme ends in some parameters space, it becomes imperative to understand the properties of these galaxies. In Grupe (2004), and more recently Ojha et al (2020b) and Waddell & Gallo (2020) the properties of NlSy1 galaxies have been studied comparatively with BlSy1 galaxies. In Grupe (2004), a sample of 110 X-ray selected galaxies was available, which is around 250 in our case, owing to the availability of SDSS sepctrum.…”

Section: Resultsmentioning

confidence: 99%

Properties of Broad and Narrow Line Seyfert galaxies selected from SDSS

Jha

Chand

Ojha

2020

ComBAO

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A comparative study of a representative sample of Broad and Narrow line Seyfert galaxies is presented. These galaxies have been selected from the 16th data release of the Sloan Digital Sky Survey (SDSS-DR16). Some of the properties derived from single epoch spectrum vary significantly between the two populations. We find that the emission regions of Narrow line Seyfert galaxies are rich in iron content and the accretion rate is higher compared to the Broad line Seyfert galaxies. In our analysis, the H emission line is found to be asymmetric in few of the galaxies with more number of Narrow-line Seyfert 1 (NlSy1) galaxies showing blue asymmetries i.e. traces of outflowing gas as compared to the Broad-line Seyfert 1 (BlSy1) galaxies. This behaviour may be explained by the higher iron content present in the emission line regions of NlSy1 galaxies.

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“…However, the geometry of the disc-corona system is still highly debated, as is the dominant emission process at work: either relativistic reflection resulting from the illumination of the accretion disc by a hot corona or the Comptonisation of seed photons from the accretion disc by a warm-hot corona (e.g. Magdziarz et al 1998;Porquet et al 2004;Crummy et al 2006;Bianchi et al 2009;Fabian et al 2012;Done et al 2012;Gliozzi et al 2013;Petrucci et al 2018;Gliozzi & Williams 2020;Waddell & Gallo 2020). Moreover, some AGN exhibit warm absorbers along the line-of-sight that can severely complicate the X-ray data analysis.…”

Section: Introductionmentioning

confidence: 99%

The first simultaneous X-ray broadband view of Mrk 110 with XMM-Newton and NuSTAR

Porquet

Reeves

Grosso

et al. 2021

A&A

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Context. Soft and hard X-ray excesses, compared to the continuum power-law shape between ∼2−10 keV, are common features observed in the spectra of active galactic nuclei (AGN) and are associated with the accretion disc-corona system around the supermassive black hole. However, the dominant process at work is still highly debated and has been proposed to be either relativistic reflection or Comptonisation. Such an investigation can be problematic for AGN that have significant intrinsic absorption, either cold or warm, which can severely distort the observed continuum. Therefore, AGN with no (or very weak) intrinsic absorption along the line-of-sight, called bare AGN, are the best targets for directly probing disc-corona systems. Aims. We aim to characterise the main X-ray spectral physical components from the bright bare broad-line Seyfert 1 AGN Mrk 110, as well as the physical process(es) at work in its disc-corona system viewed almost face-on. Methods. We perform the X-ray broadband spectral analysis thanks to two simultaneous XMM-Newton and NuSTAR observations performed on November 16−17, 2019, and April 5−6, 2020. We also use a deep NuSTAR observation obtained in January 2017 for the spectral analysis above 3 keV. Results. The broadband X-ray spectra of Mrk 110 are characterised by the presence of a prominent and absorption-free smooth soft X-ray excess, moderately broad O VII and Fe Kα emission lines, and a lack of a strong Compton hump. The continuum above ∼3 keV is very similar at both epochs, while some variability (stronger when brighter) is present for the soft X-ray excess. A combination of soft and hard Comptonisation by a warm and hot corona, respectively, plus mildly relativistic disc reflection reproduce the broadband X-ray continuum very well. The inferred warm corona temperature, kTwarm ∼ 0.3 keV, is similar to the values found in other sub-Eddington AGN, whereas the hot corona temperature, kThot ∼ 21−31 keV (depending mainly on the assumed hot corona geometry), is found to be in the lower range of the values measured in AGN.

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A Suzaku sample of unabsorbed narrow-line and broad-line Seyfert 1 galaxies – I. X-ray spectral properties

Cited by 27 publications

References 132 publications

A Weakening Compton Hump and Soft X-Ray Excess Detected in the Seyfert 1 Galaxy MCG –02–58–22

A Weakening Compton Hump and Soft X-Ray Excess Detected in the Seyfert 1 Galaxy MCG –02–58–22

Properties of Broad and Narrow Line Seyfert galaxies selected from SDSS

The first simultaneous X-ray broadband view of Mrk 110 with XMM-Newton and NuSTAR

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