Far-infrared emission in luminous quasars accompanied by nuclear outflows

Maddox, Natasha; Jarvis, M. J.; Banerji, M.; Hewett, Paul C.; Bourne, N.; Dunne, L.; Dye, S.; Eales, Stephen Anthony; Furlanetto, C.; Maddox, Steve; Smith, M.; Valiante, Elisabetta

doi:10.1093/mnras/stx1416

Cited by 12 publications

(9 citation statements)

References 57 publications

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“…Within this model, quasars at z ≈ 2 which are actively driving winds are expected to show larger C iv blueshifts in their spectra. Maddox et al (2017) showed that the individual FIR detection rate of such quasars is higher than would be expected for their optical luminosities. More specifically, objects which are detected in the Herschel -ATLAS survey at 100-500 µm are disproportionately more likely to show large C iv blueshifts.…”

Section: Far-infrared Propertiesmentioning

confidence: 90%

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

Temple

Banerji

Hewett

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Using data from SDSS, UKIDSS and WISE, we investigate the properties of the high-frequency cutoff to the infrared emission in ≃5000 carefully selected luminous (Lbol ∼ 1047) type 1 quasars. The strength of ≃2 μm emission, corresponding to emission from the hottest ($T>1200\rm \, K$) dust in the sublimation zone surrounding the central continuum source, is observed to correlate with the blueshift of the C iv λ1550 emission line. We therefore find that objects with stronger signatures of nuclear outflows tend to have a larger covering fraction of sublimation-temperature dust. When controlling for the observed outflow strength, the hot dust covering fraction does not vary significantly across our sample as a function of luminosity, black hole mass or Eddington fraction. The correlation between the hot dust and the C iv line blueshifts, together with the lack of correlation between the hot dust and other parameters, therefore provides evidence of a link between the properties of the broad emission line region and the infrared-emitting dusty regions in quasars.

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Section: Far-infrared Propertiesmentioning

confidence: 90%

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

Temple

Banerji

Hewett

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…They also investigated the SFR as a function of C IV FWHM and the C IV line asymmetry; we have not made use of either of these two results as it is not clear that the FWHM of C IV has a clear relationship with black-hole mass (Coatman et al 2017) and the asymmetry parameter is different from the blueshifts investigated herein. However, Maddox et al (2017) perform a similar analysis to that of Harris et al (2016), measuring the C IV blueshifts (using the same definition adopted herein) of a sample of 1185 quasars at 1.6 < z < 4.8 with 2-σ detections at λ obs > 250µm (and a matched sample of undetected sources). Therefore we can compare our work to independent indicators of SFR as a function of both EW (Harris et al 2016) and blueshift (Maddox et al 2017); i.e., as a function of C IV distance.…”

Section: Star Formation Ratesmentioning

confidence: 99%

“…However, Maddox et al (2017) perform a similar analysis to that of Harris et al (2016), measuring the C IV blueshifts (using the same definition adopted herein) of a sample of 1185 quasars at 1.6 < z < 4.8 with 2-σ detections at λ obs > 250µm (and a matched sample of undetected sources). Therefore we can compare our work to independent indicators of SFR as a function of both EW (Harris et al 2016) and blueshift (Maddox et al 2017); i.e., as a function of C IV distance.…”

Section: Star Formation Ratesmentioning

confidence: 99%

Probing the Wind Component of Radio Emission in Luminous High-Redshift Quasars

Richards,

McCaffrey,

Kimball

et al. 2021

Preprint

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We discuss a novel probe of the contribution of wind-related shocks to the radio emission in otherwise radio-quiet quasars. Given 1) the known non-linear correlation between UV and X-ray luminosity in quasars, 2) that such correlation leads to higher likelihood of radiation-line-driven winds in more luminous quasars, and 3) that luminous quasars are more abundant at high redshift, deep radio observations of high-redshift quasars are needed to probe potential contributions of accretion disk winds to radio emission from quasars. To this end, we target a sample of 50 z 1.65 color-selected quasars that span the range of expected accretion disk wind properties as traced by broad C IV emission. 3-GHz observations with the Very Large Array to an rms of ≈ 10µJy beam −1 probe to star formation rates of ∼ 400 M yr −1 , leading to 22 detections. Supplementing these pointed observations are survey data of 388 sources from the LOFAR Two-metre Sky Survey Data Release 1 that reach comparable depth (for a typical radio spectral index), where 123 sources are detected. These combined observations reveal a radio detection fraction that is a non-linear function of C IV emission line properties and suggest that the data may require multiple origins of radio emission in radio-quiet quasars. Specifically, in radio-quiet quasars we find evidence for radio emission from weak jets or coronae in quasars with low Eddingtion ratios, with either (or both) star formation and accretion disk winds playing an important role in luminous quasars and correlated with increasing Eddington ratio. Additional pointed radio observations will be needed to fully establish the nature of radio emission in radio-quiet quasars.

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“…Taken together with the results of Coatman et al (2019), where a correlation between the blueshift of [O iii] and the blueshift of the C iv emission line is seen, this implies that FIR-luminous quasars also exhibit stronger galaxy-scale outflows compared to their FIR-faint counterparts. The FIR bright quasars studied by Maddox et al (2017) are not reddened, but outflows and starburst activity are nevertheless being seen in this population. There is likely to be a considerable overlap between star formation, outflows, and the presence and clearing of dust in massive (active) galaxies, and obtaining observations at multiple wavelengths of the same objects in order to quantify these processes is the only way to move to a complete understanding of the interplay between SMBH accretion, outflows, and star formation, and their impact on galaxies at z > 2.…”

Section: Obscuring Dustmentioning

confidence: 92%

“…Thus, star formation in luminous quasar hosts can also persist after the dust has been cleared from the line of sight. Using a population of SDSS quasars, Maddox et al (2017) find that strong FIR emission (and therefore presumably star formation) is associated with strong nuclear outflows as traced by large C iv blueshifts. Taken together with the results of Coatman et al (2019), where a correlation between the blueshift of [O iii] and the blueshift of the C iv emission line is seen, this implies that FIR-luminous quasars also exhibit stronger galaxy-scale outflows compared to their FIR-faint counterparts.…”

Section: Obscuring Dustmentioning

confidence: 99%

[OIII] Emission Line Properties in a New Sample of Heavily Reddened Quasars at $z>2$

Temple,

Banerji,

Hewett

et al. 2019

Preprint

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We present VLT-SINFONI near infra-red spectra of 26 new heavily reddened quasar candidates selected from the UKIDSS-LAS, VISTA VHS and VIKING imaging surveys. This new sample extends our reddened quasar search to both brighter and fainter luminosities. 25 of the 26 candidates are confirmed to be broad line quasars with redshifts 0.7 < z < 2.6 and dust extinctions 0.5 < E(B − V) < 3.0. Combining with previously identified samples, we study the H α, H β and [O iii] emission line properties in 22 heavily reddened quasars with L bol ≈ 10 47 erg s −1 and z > 2. We present the first comparison of the [O iii] line properties in high luminosity reddened quasars to a large sample of 111 unobscured quasars in the same luminosity and redshift range. Broad wings extending to velocities of 2500 km s −1 are seen in the [O iii] emission line profiles of our reddened quasars, suggesting that strong outflows are affecting the ionised gas kinematics. However, we find no significant difference between the kinematics of the [O iii] emission in reddened and unobscured quasars when the two samples are matched in luminosity and redshift. Our results are consistent with a model where quasar-driven outflows persist for some time after the obscuring dust has been cleared from along the line of sight. Assuming the amount of ionised gas in reddened and unobscured quasars is similar, we use the equivalent width distribution of the [O iii] emission to constrain the location of the obscuring dust in our reddened quasars. We find that the dust is most likely to be located on galactic scales, outside the [O iii] emitting region.

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Far-infrared emission in luminous quasars accompanied by nuclear outflows

Cited by 12 publications

References 57 publications

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

Probing the Wind Component of Radio Emission in Luminous High-Redshift Quasars

[OIII] Emission Line Properties in a New Sample of Heavily Reddened Quasars at $z>2$

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