The extreme flare in III Zw 2:

Brunthaler, A.; Falcke, H.; Bower, Geoffrey C.; Aller, M. F.; Aller, H. D.; Teräsranta, H.

doi:10.1051/0004-6361:20042427

Cited by 49 publications

(59 citation statements)

References 34 publications

(41 reference statements)

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“…Yet another option has been proposed by Gu & Chen (2010): the jet activity could be intermittent, as observed in other Seyferts (e.g. Brunthaler et al 2005, Mundell et al 2009). Therefore, as the technological improvement of radio surveys allows better monitoring of these sources (e.g.…”

Section: Discussionmentioning

confidence: 99%

Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Foschini

Berton

Caccianiga

et al. 2015

A&A

188

344

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We have conducted a multiwavelength survey of 42 radio loud narrow-1ine Seyfert 1 galaxies (RLNLS1s), selected by searching among all the known sources of this type and omitting those with steep radio spectra. We analyse data from radio frequencies to X-rays, and supplement these with information available from online catalogues and the literature in order to cover the full electromagnetic spectrum. This is the largest known multiwavelength survey for this type of source. We detected 90% of the sources in X-rays and found 17% at γ rays. Extreme variability at high energies was also found, down to timescales as short as hours. In some sources, dramatic spectral and flux changes suggest interplay between a relativistic jet and the accretion disk. The estimated masses of the central black holes are in the range ∼ 10 6−8 M ⊙ , lower than those of blazars, while the accretion luminosities span a range from ∼ 0.01 to ∼ 0.49 times the Eddington limit, with an outlier at 0.003, similar to those of quasars. The distribution of the calculated jet power spans a range from ∼ 10 42.6 to ∼ 10 45.6 erg s −1 , generally lower than quasars and BL Lac objects, but partially overlapping with the latter. Once normalised by the mass of the central black holes, the jet power of the three types of active galactic nuclei are consistent with each other, indicating that the jets are similar and the observational differences are due to scaling factors. Despite the observational differences, the central engine of RLNLS1s is apparently quite similar to that of blazars. The historical difficulties in finding radio-loud narrow-line Seyfert 1 galaxies might be due to their low power and to intermittent jet activity.

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Section: Discussionmentioning

confidence: 99%

Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Foschini

Berton

Caccianiga

et al. 2015

A&A

188

344

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“…Flares in AGN sources can often be fitted with exponential decays (Valtaoja et al 1999). For example, a strong radio flare in 1999 in the Seyfert galaxy III Zw 2 has a decay rate of τ d = 0.73 year (Brunthaler et al 2005a).…”

Section: Discussionmentioning

confidence: 99%

Discovery of a bright radio transient in M 82: a new radio supernova?

Brunthaler¹,

Menten²,

Reid

et al. 2009

A&A

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In this Letter, we report the discovery of a new bright radio transient in M 82. Using the Very Large Array, we observed the nuclear region of M 82 at several epochs at 22 GHz and detected a new bright radio source in this galaxy's central region. We find a flux density for this flaring source that is ∼300 times larger than the upper limits determined in previous observations. The flare must have started between 2007 October 29 and 2008 March 24. Over the past year, the flux density of this new source has decreased from ∼100 mJy to ∼11 mJy. The lightcurve (based on only three data points) can be fitted better with an exponential decay than with a power law. Based on the current data we cannot identify the nature of this transient source. However, a new radio supernova seems to be the most natural explanation. With its flux density of more than 100 mJy, it is at least 1.5 times brighter than SN1993J in M 81 at the peak of its lightcurve at 22 GHz.

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“…Since the radio emission is likely boosted greatly by the relativistic motion of the jet as indicated by its large brightness temperature, most of these sources would be intrinsically radio-weak or radio-intermediate at most. The properties of jets in radio-intermediate quasars are not well understood, but in at least one such object, III Zw 2, superluminal motion of knots at the parsec scale has been detected ( Brunthaler et al 2005). Recurrent radio flares were observed in the same object.…”

Section: Discussionmentioning

confidence: 99%

“…Second, most FIRST-detected BAL quasars are radio-intermediate, and it is not clear whether the unification model, which is based on radio-loud quasars (i.e., core-dominated flat-spectrum radio sources are face-on) still applies. In addition, the size of radiointermediate sources might be much smaller than that of radioloud sources, such as in the case of III Zw 2 (Brunthaler et al 2005), and thus much higher spatial resolution is probably required to confirm their compactness. Jiang & Wang (2003) acquired highresolution very long baseline interferometry (VLBI) images of three BAL quasars at 1.6 GHz; they found one source that was resolved into an asymmetric two-sided structure with a bright central component at $20 mas resolution.…”

Section: Introductionmentioning

confidence: 99%

Polar Outflows in Six Broad Absorption Line Quasars

Zhou

Wang

et al. 2006

ApJ

104

134

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Using radio observations by FIRST and NVSS, we build a sample of 151 radio-variable quasars selected from the Sloan Digital Sky Survey Data Release 3 (SDSS DR3). Six (and probably another two) of these objects are classified as broad absorption line (BAL) quasars and show radio flux variations of a few tens of percent within 1.5-5 yr. Such large amplitudes of variations imply brightness temperatures much higher than the inverse Compton limits (10 12 K) in all these BAL quasars, suggesting the presence of relativistic jets beaming toward the observer. The angles between the outflow and the jet are constrained to be less than $20 . Such BAL quasars with polar outflows are beyond the simple unification models of BAL and non-BAL quasars, which hypothesize BAL quasars as otherwise normal quasars seen nearly edge-on.

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The extreme flare in III Zw 2:

Cited by 49 publications

References 34 publications

Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Discovery of a bright radio transient in M 82: a new radio supernova?

Polar Outflows in Six Broad Absorption Line Quasars

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