A high-velocity component to the complex absorption in IRAS 13349+2438

Parker, M. L.; Matzeu, G. A.; Guainazzi, M.; Kalfountzou, E.; Miniutti, G.; Santos-Lleó, M.; Schartel, N.

doi:10.1093/mnras/sty2020

Cited by 25 publications

(22 citation statements)

References 58 publications

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“…IRAS 13349+2438 shows large variability amplitudes at higher energies and our result agrees with Parker et al (2018b) who find v out = 0.13 ± 0.01c. This time the relatively low sigma is due to fitting the higher-ionization-state emission line Fe xxvi, meaning the spline is inaccurately fitting lower energy lines that are not expected to be present.…”

Section: Appendix A: Brief Notes On Single Agn Sourcessupporting

confidence: 93%

Searching for ultra-fast outflows in AGN using variability spectra

Igo

Parker

Matzeu

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present a qualitative search for ultra-fast outflows (UFOs) in excess variance spectra of radio-quiet active galactic nuclei (AGN). We analyse 42 sources from the Tombesi et al. (2010) spectroscopic UFO detection sample, and an additional 22 different sources from the Kara et al. (2016) variability sample. A total of 58 sources have sufficient observational data from XMM-Newton EPIC-pn and variability for an excess variance spectrum to be calculated. We examine these spectra for peaks corresponding to variable blue-shifted H-and He-like ion absorption lines from UFOs. We find good evidence for such outflows in 28% of the AGN sample and weak evidence in a further 31%, meaning that ∼ 30-60% of the AGN sample hosts such UFOs. The mean and median blue-shifted velocity is found to be ∼ 0.14c and 0.12c, respectively. Current variability methods allow for a fast, model-independent determination of UFOs, however, further work needs to be undertaken to better characterize the statistical significance of the peaks in these spectra by more rigorous modelling. Detecting good evidence for variable UFO lines in a large number of sources also lays the groundwork for detailed analysis of the variability timescales of the absorbers. This will allow us to probe their densities and hence distances from the central super-massive black hole.

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Section: Appendix A: Brief Notes On Single Agn Sourcessupporting

confidence: 93%

Searching for ultra-fast outflows in AGN using variability spectra

Igo

Parker

Matzeu

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…The velocity of the outflow of ∼0.1c is also not as high as seen in many other AGN (for a review of the recent UFO detections and their velocities see Parker et al 2018a), where velocities as high as 0.3c-0.5c were detected (e.g. Reeves et al 2018b;Walton et al 2019, are the most extreme examples), although velocities in the range of 0.05 − 0.1c have also been detected in some AGN (e.g.…”

Section: Discussionmentioning

confidence: 94%

“…We also detect a weak warm absorber in PG 1448+273. Warm absorbers were detected in multiple AGN with UFO detections, including PG 1211+143 (Reeves et al 2018a), PG 1114+445 (Serafinelli et al 2019), IRAS 17020+4544 (Leighly et al 1997;Longinotti et al 2015) and IRAS 13349+2438 (Sako et al 2001;Parker et al 2018b). Comparing their energetics and mass outflow rates can be helpful in explaining their (possibly common) origin (Tombesi et al 2013) and their interaction with the surrounding environment.…”

Section: Discussionmentioning

confidence: 99%

Detection of a variable ultra-fast outflow in the Narrow Line Seyfert 1 galaxy PG 1448+273

Kosec,

Zoghbi,

Walton

et al. 2020

Preprint

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Relativistically blueshifted absorption features of highly ionised ions, the so-called ultra-fast outflows (UFOs), have been detected in the X-ray spectra of a number of accreting supermassive black holes. If these features truly originate from accretion disc winds accelerated to more than 10 per cent of the speed of light, their energy budget is very significant and they can contribute to or even drive galaxy-scale feedback from active galactic nuclei (AGN). However, the UFO spectral features are often weak due to high ionisation of the outflowing material, and the inference of the wind physical properties can be complicated by other spectral features in AGN such as relativistic reflection. Here we study a highly accreting Narrow Line Seyfert 1 galaxy PG 1448+273. We apply an automated, systematic routine for detecting outflows in accreting systems and achieve an unambiguous detection of a UFO in this AGN. The UFO absorption is observed in both soft and hard X-ray bands with the XMM-Newton observatory. The velocity of the outflow is (26900 ± 600) km/s (∼0.09c), with an ionisation parameter of log(ξ /erg cm s −1 ) = 4.03 +0.10 −0.08 and a column density above 10 23 cm −2 . At the same time, we detect weak warm absorption features in the spectrum of the object. Our systematic outflow search suggests the presence of further multi-phase wind structure, but we cannot claim a significant detection considering the present data quality. The UFO is not detected in a second, shorter observation with XMM-Newton, indicating variability in time, observed also in other similar AGN.

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“…J1337+2423 has also been found to host strong multiphase ultrafast outflows with velocities of ∼0.14 c and ∼0.27 c (Parker et al 2020), as well as two warm absorbers with velocities around -600 km s −1 (Parker et al 2018). The optical spectrum does not show [O III] line shifts, but reveals a strong [O III] wing component with a velocity of -598 km s −1 and a FWHM of 2241 km s −1 .…”

Section: B34e)mentioning

confidence: 99%

Unravelling the origin of extended radio emission in narrow-line Seyfert 1 galaxies with the JVLA

Järvelä,

Dahale,

Crepaldi

et al. 2021

Preprint

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Narrow-line Seyfert 1 (NLS1) galaxies are believed to be active galactic nuclei (AGN) in the early stages of their evolution. Some dozens of them have been found to host relativistic jets, whilst the majority of NLS1s has not even been detected in radio, emphasising the heterogeneity of the class in this band. In this paper, our aim is to determine the predominant source of radio emission in a sample of 44 NLS1s, selected based on their extended kpc-scale radio morphologies at 5.2 GHz. We accomplish this by analysing their spatially resolved radio spectral index maps, centred at 5.2 GHz, as the spectral index carries information about the production mechanisms of the emission. In addition, we utilise several diagnostics based on mid-infrared emission to estimate the star formation activity of their host galaxies. These data are complemented by archival data to draw a more complete picture of each source. We find an extraordinary diversity among our sample. Approximately equal fractions (∼10-12 sources) of our sources can be identified as AGN-dominated, composite, and host-dominated. Among the AGN-dominated sources are a few NLS1s with very extended jets, reaching distances of tens of kpc from the nucleus. One of these, J0814+5609, hosts the most extended jets found in an NLS1 so far. We also identify five NLS1s that could be classified as compact steep-spectrum sources. In addition, one source shows a possible kpc-scale relic reaching well outside the host galaxy and restarted nuclear activity, and one could belong to the NLS1 subclass hosting relativistic jets that seems to be absorbed at lower radio frequencies (< 10 GHz). We further conclude that due to the variety seen in NLS1s simple proxies, such as the star formation diagnostics also employed in this paper, and the radio loudness parameter, are not ideal tools for characterising NLS1s. We emphasise the necessity of examining NLS1s as individuals, instead of making assumptions based on their classification. When these issues are properly taken into account, NLS1s offer an exceptional environment to study the interplay of the host galaxy and several AGN-related phenomena, such as jets and outflows.

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A high-velocity component to the complex absorption in IRAS 13349+2438

Cited by 25 publications

References 58 publications

Searching for ultra-fast outflows in AGN using variability spectra

Searching for ultra-fast outflows in AGN using variability spectra

Detection of a variable ultra-fast outflow in the Narrow Line Seyfert 1 galaxy PG 1448+273

Unravelling the origin of extended radio emission in narrow-line Seyfert 1 galaxies with the JVLA

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