The radio properties of radio-quiet quasars

Kukula, M. J.; Dunlop, James; Hughes, D. H.; Rawlings, Steve

doi:10.1046/j.1365-8711.1998.01481.x

Cited by 125 publications

(193 citation statements)

References 54 publications

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“…Seyfert galaxies and radio-quiet quasars share a single radio-optical continuum correlation that was Ðrst proposed by Kukula et al (1998), who compared the Seyfert 1 galaxies from the CfA sample with a subset of 27 lowredshift PG sources. To mitigate host galaxy contamination for the Seyfert galaxies, Kukula et al (1998) utilized groundbased "" nuclear ÏÏ magnitudes from Huchra & Burg (1992). Two caveats, however, can be raised against the analysis of Kukula et al (1998).…”

Section: Radio Emission and Accretion Ratementioning

confidence: 85%

“…To mitigate host galaxy contamination for the Seyfert galaxies, Kukula et al (1998) utilized groundbased "" nuclear ÏÏ magnitudes from Huchra & Burg (1992). Two caveats, however, can be raised against the analysis of Kukula et al (1998). First, they did not consider the e †ect of distance on the correlation, and second, as these authors recognized, their correction for host galaxy light yields only crude AGN magnitudes, since the photometry of Huchra & Burg (1992) was based on apertures of diameters Z10AÈ15A.…”

Section: Radio Emission and Accretion Ratementioning

confidence: 99%

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Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Peng

2001

ApJ

220

265

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Historically, Seyfert nuclei have been considered to be radio-quiet active galactic nuclei (AGNs). We question this widely held assumption by showing that the distribution of the radio-to-optical luminosity ratio, when properly measured for the nuclear component, places the majority of R 4 L l (6 cm)/L l (B), type 1 Seyfert nuclei in the category of radio-loud AGNs, deÐned here as objects with R º 10. This result is further strengthened by strong correlations found between radio power and optical continuum and emission-line luminosities, as has been established previously for more powerful AGNs. We also present a new calibration of the relation between optical continuum and Balmer emission-line luminosities valid in the regime of low-luminosity AGNs.

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Section: Radio Emission and Accretion Ratementioning

confidence: 85%

Section: Radio Emission and Accretion Ratementioning

confidence: 99%

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Peng

2001

ApJ

220

265

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“…It is not detected as a radio source ( Kukula et al 1998). From a noisy optical offnuclear spectrum, Nolan et al (2001) estimate a stellar population age of about 12 Gyr.…”

Section: A3 Pg 0923+201mentioning

confidence: 98%

Evidence for Merger Remnants in Early‐Type Host Galaxies of Low‐Redshift QSOs1

Bennert

Canalizo

Jungwiert

et al. 2008

ApJ

167

206

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We present results from a pilot HST ACS deep imaging study in broadband Vof five low-redshift QSO host galaxies classified in the literature as ellipticals. The aim of our study is to determine whether these early-type hosts formed at high redshift and have since evolved passively, or whether they have undergone relatively recent mergers that may be related to the triggering of the nuclear activity. We perform two-dimensional modeling of the light distributions to analyze the host galaxies' morphology. We find that, while each host galaxy is reasonably well fitted by a de Vaucouleurs profile, the majority of them (4/5) reveal significant fine structure such as shells and tidal tails. These structures contribute between $5% and 10% to the total V-band luminosity of each host galaxy within a region of r $ 3r eA and are indicative of merger events that occurred between a few hundred Myr and a Gyr ago. These timescales are comparable to starburst ages in the QSO hosts previously inferred from Keck spectroscopy. Our results thus support a consistent scenario in which most of the QSO host galaxies suffered mergers with accompanying starbursts that likely also triggered the QSO activity in some way, but we are also left with considerable uncertainty on physical mechanisms that might have delayed this triggering for several hundred Myr after the merger.

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“…Compact radio emission (i.e., on 5 kpc scales) in radioquiet quasars may be associated with nuclear coronal activity (i.e., the region around the AGN accretion disk) or compact radio jets (e.g., Kukula et al 1998;Ulvestad et al 2005;Laor & Behar 2008). Nuclear coronal activity is predicted to produce flat spectral indices (i.e., α ≈ 0; Laor & Behar 2008), which is not what is observed in the "Teacup" AGN ( Figure 2).…”

Section: Compact Jets and Nuclear Activitymentioning

confidence: 99%

STORM IN A “TEACUP”: A RADIO-QUIET QUASAR WITH ≈10 kpc RADIO-EMITTING BUBBLES AND EXTREME GAS KINEMATICS

Harrison

Thomson

Alexander

et al. 2015

ApJ

138

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We present multi-frequency (1-8 GHz) Very Large Array data, combined with VIsible MultiObject Spectrograph integral field unit data and Hubble Space Telescope imaging, of a z = 0.085 radio-quiet type 2 quasar (with L 1.4 GHz ≈ 5 × 10 23 W Hz −1 and L AGN ≈ 2 × 10 45 erg s −1 ). Due to the morphology of its emission-line region, the target (J1430+1339) has been referred to as the "Teacup" active galactic nucleus (AGN) in the literature. We identify "bubbles" of radio emission that are extended ≈10-12 kpc to both the east and west of the nucleus. The edge of the brighter eastern bubble is co-spatial with an arc of luminous ionized gas. We also show that the "Teacup" AGN hosts a compact radio structure, located ≈0.8 kpc from the core position, at the base of the eastern bubble. This radio structure is co-spatial with an ionized outflow with an observed velocity of v = −740 km s −1 . This is likely to correspond to a jet, or possibly a quasar wind, interacting with the interstellar medium at this position. The large-scale radio bubbles appear to be inflated by the central AGN, which indicates that the AGN can also interact with the gas on 10 kpc scales. Our study highlights that even when a quasar is formally "radio-quiet" the radio emission can be extremely effective for observing the effects of AGN feedback.

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The radio properties of radio-quiet quasars

Cited by 125 publications

References 54 publications

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Evidence for Merger Remnants in Early‐Type Host Galaxies of Low‐Redshift QSOs1

STORM IN A “TEACUP”: A RADIO-QUIET QUASAR WITH ≈10 kpc RADIO-EMITTING BUBBLES AND EXTREME GAS KINEMATICS

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