Discovery of an Ultraviolet Counterpart to an Ultrafast X-Ray Outflow in the Quasar PG 1211+143

Kriss, G. A.; Lee, Julia C.; Danehkar, Ashkbiz; Nowak, Michael A.; Fang, Taotao; Hardcastle, M. J.; Neilsen, Joey; Young, A. J.

doi:10.3847/1538-4357/aaa42b

Cited by 31 publications

(57 citation statements)

References 52 publications

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“…At our best-fit x = log 2.87, the ionization fraction of H I is- , roughly consistent with our measured lower limit of  N log H I -14.5 cm 2 . As Kriss et al (2018) show, the Lyα profile actually consists of two blended components, so it is possible that the X-ray UFO is associated with only a portion of the Lyα absorption profile. This would also explain the narrow turbulent velocity we find for the X-ray absorber compared to the Lyα absorber.…”

Section: Hst-cos Results: Evidence For Amentioning

confidence: 99%

“…Kriss et al (2018) discuss in detail the analysis of the UV data in general and this feature specifically. They find an average outflow velocity of v out =−16,980±40kms −1 (z out = −0.0551) with an FWHM of 1080±80kms −1 .…”

Section: Hst-cos Results: Evidence For Amentioning

confidence: 99%

“…Figure 9. HST-COS G130M spectrum of PG 1211+143 in the wavelength range covering the broad Lyα absorption line profile, the IGM Lyα lines (Penton et al 2004) and interstellar N V and S II lines, adapted from Kriss et al (2018). The lower horizontal axis is the observed wavelength in ångstrom.…”

Section: Vla Results: Evidence For a Jet?mentioning

confidence: 99%

“…To fill in the gap from 1190 to 1270 Å between the two segments of the COS detector, we used grating G130M during the second visit. See Section 6 for a summary of the observational results, and Kriss et al (2018) for details of the data reduction, calibration, and analysis.…”

Section: Uv Observationsmentioning

confidence: 99%

“…In Section 5, we describe in detail the modeling of the ionized absorber using the photoionization code XSTAR. The HST UV results are reported in a complementary paper (Kriss et al 2018). A summary of its findings as relevant to this paper are presented in Section 6.…”

Section: Introductionmentioning

confidence: 99%

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The Ultra-fast Outflow of the Quasar PG 1211+143 as Viewed by Time-averaged Chandra Grating Spectroscopy

Danehkar

Nowak

Lee

et al. 2018

ApJ

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We present a detailed X-ray spectral study of the quasar PG 1211+143 based on Chandra High Energy Transmission Grating Spectrometer (HETGS) observations collected in a multi-wavelength campaign with UV data using the Hubble Space Telescope Cosmic Origins Spectrograph (HST-COS) and radio bands using the Jansky Very Large Array (VLA). We constructed a multi-wavelength ionizing spectral energy distribution using these observations and archival infrared data to create XSTAR photoionization models specific to the PG 1211+143 flux behavior during the epoch of our observations. Our analysis of the Chandra-HETGS spectra yields complex absorption lines from H-like and He-like ions of Ne, Mg, and Si, which confirm the presence of an ultra-fast outflow (UFO) with a velocity of approximately −17,300 km s −1 (outflow redshift z out ∼ −0.0561) in the rest frame of PG 1211+143. This absorber is well described by an ionization parameter x~-log 2.9 erg s cm 1 and column density~-N log 21.5 cm H 2 . This corresponds to a stable region of the absorber's thermal stability curve, and furthermore its implied neutral hydrogen column is broadly consistent with a broad Lyα absorption line at a mean outflow velocity of approximately −16,980 km s −1 detected by our HST-COS observations. Our findings represent the first simultaneous detection of a UFO in both X-ray and UV observations. Our VLA observations provide evidence for an active jet in PG 1211+143, which may be connected to the X-ray and UV outflows; this possibility can be evaluated using very-long-baseline interferometric observations.

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Section: Hst-cos Results: Evidence For Amentioning

confidence: 99%

Section: Hst-cos Results: Evidence For Amentioning

confidence: 99%

Section: Vla Results: Evidence For a Jet?mentioning

confidence: 99%

Section: Uv Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Ultra-fast Outflow of the Quasar PG 1211+143 as Viewed by Time-averaged Chandra Grating Spectroscopy

Danehkar

Nowak

Lee

et al. 2018

ApJ

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Ionized outflows from active galactic nuclei as the essential elements of feedback

et al. 2020

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Outflows from active galactic nuclei (AGN) are one of the fundamental mechanisms by which the central supermassive black hole interacts with its host galaxy. Detected in ≥ 50% of nearby AGN, these outflows have been found to carry kinetic energy that is a significant fraction of AGN power, and thereby give 'negative' feedback to their host galaxies. To understand the physical processes that regulate them, it is important to have a robust estimate of their physical and dynamical parameters. In this review we summarize our current understanding on the physics of the ionized outflows detected in absorption in the UV and X-ray wavelength bands. We discuss the most relevant observations and our current knowledge and uncertainties in the measurements of the outflow parameters. We also discuss their origin and acceleration mechanisms. The commissioning and concept studies of large telescope missions with high resolution spectrographs in UV/optical and X-rays along with rapid advancements in simulations offer great promise for discoveries in this field over the next decade.

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Multiwavelength campaign on Mrk 509

Kriss

Arav

Edmonds

et al. 2019

A&A

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Aims. To elucidate the location, physical conditions, mass outflow rate, and kinetic luminosity of the outflow from the active nucleus of the Seyfert 1 galaxy Mrk 509, we used coordinated UV and X-ray spectral observations in 2012 to follow up our lengthier campaign conducted in 2009. Methods. We observed Mrk 509 with the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) on 2012-09-03 and 2012-10-11 coordinated with X-ray observations using the High Energy Transmission Grating on the Chandra X-ray Observatory. Our far-ultraviolet spectra used grating G140L on COS to cover wavelengths from 920–2000 Å at a resolving power of ∼2000, and gratings G130M and G160M to cover 1160–1750 Å at a resolving power of ∼15, 000. Results. We detect variability in the blueshifted UV absorption lines on timescales spanning 3–12 years. The inferred densities in the absorbing gas are greater than log n cm−3 ∼ 3. For ionization parameters ranging over log U = −1.5 to −0.2, we constrain the distances of the absorbers to be closer than 220 pc to the active nucleus. Conclusions. The impact on the host galaxy appears to be confined to the nuclear region.

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Discovery of an Ultraviolet Counterpart to an Ultrafast X-Ray Outflow in the Quasar PG 1211+143

Cited by 31 publications

References 52 publications

The Ultra-fast Outflow of the Quasar PG 1211+143 as Viewed by Time-averaged Chandra Grating Spectroscopy

The Ultra-fast Outflow of the Quasar PG 1211+143 as Viewed by Time-averaged Chandra Grating Spectroscopy

Ionized outflows from active galactic nuclei as the essential elements of feedback

Multiwavelength campaign on Mrk 509

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