Dual Active Galactic Nuclei: Deprojecting the Binary Cores

Wang, X.-W.; Zhou, Hongyan

doi:10.1088/0004-637x/757/2/124

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…This fraction was estimated by Shen et al (2011a) λ5007 fraction of ∼2.5% at 0.8 < z < 1.6. The influence of inclination and phase angle for selection of dual AGN through double-peaked emission line profiles was also investigated by Wang & Zhou (2012) in which they found that, at a phase angle of φ ≈ 50 • , we miss at least 50% of all AGN with double emission components. We note that this 50% correction is a lower limit since it does not account for instrumental resolution, and that applying additional corrections based on our completeness estimates would likely make the correction estimated in this manner similar to that of Shen et al (2011a).…”

Section: Samplementioning

confidence: 99%

IDENTIFICATION OF OUTFLOWS AND CANDIDATE DUAL ACTIVE GALACTIC NUCLEI IN SDSS QUASARS ATz= 0.8-1.6

Barrows

Lacy

Kennefick

et al. 2013

ApJ

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We present a sample of 131 quasars from the Sloan Digital Sky Survey at redshifts 0.8 < z < 1.6 with double peaks in either of the high-ionization narrow emission lines [Ne V]λ3426 or [Ne III]λ3869. These sources were selected with the intention of identifying high-redshift analogs of the z < 0.8 active galactic nuclei (AGN) with double-peaked [O III]λ5007 lines, which might represent AGN outflows or dual AGN. Lines of high-ionization potential are believed to originate in the inner, highly photoionized portion of the narrow line region (NLR), and we exploit this assumption to investigate the possible kinematic origins of the double-peaked lines. For comparison, we measure the [Ne V]λ3426 and [Ne III]λ3869 double peaks in low-redshift (z < 0.8) [O III]-selected sources. We find that [Ne V]λ3426 and [Ne III]λ3869 show a correlation between line-splitting and line-width similar to that of [O III]λ5007 in other studies; and the velocity-splittings are correlated with the quasar Eddington ratio. These results suggest an outflow origin for at least a subset of the double-peaks, allowing us to study the high-ionization gas kinematics around quasars. However, we find that a non-neligible fraction of our sample show no evidence for an ionization stratification. For these sources, the outflow scenario is less compelling, leaving the dual AGN scenario as a viable possibility. Finally, we find that our sample shows an anti-correlation between the velocity-offset ratio and luminosity ratio of the components, which is a potential dynamical argument for the presence of dual AGN. Therefore, this study serves as a first attempt at extending the selection of candidate dual AGN to higher redshifts.

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Section: Samplementioning

confidence: 99%

IDENTIFICATION OF OUTFLOWS AND CANDIDATE DUAL ACTIVE GALACTIC NUCLEI IN SDSS QUASARS ATz= 0.8-1.6

Barrows

Lacy

Kennefick

et al. 2013

ApJ

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“…First, double-peaked emission is expected only in dual active SMBHs whose orbital planes are aligned relatively edge-on along our line of sight. Those systems whose orbital planes are aligned face-on are overlooked with these methods (Rosario et al 2011;Wang et al 2012). Although this scenario may be able to explain the discrepancy by a factor of a few, it is probably difficult to account for the difference by more than an order of magnitude, provided that the alignment of the orbital planes of two active SMBHs is random in terms of our line-ofsight.…”

Section: Introductionmentioning

confidence: 99%

SUBARU ADAPTIVE-OPTICS HIGH-SPATIAL-RESOLUTION INFRAREDK- ANDL′-BAND IMAGING SEARCH FOR DEEPLY BURIED DUAL AGNs IN MERGING GALAXIES

Imanishi¹,

Saito²

2013

ApJ

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We present the results of infrared K-(2.2 µm) and L ′ -band (3.8 µm) high-spatial-resolution (<0. ′′ 2) imaging observations of nearby gas-and dust-rich infrared luminous merging galaxies, assisted by the adaptive optics (AO) system on the Subaru 8.2-m telescope. We investigate the presence and frequency of red K − L ′ compact sources, which are sensitive indicators of active galactic nuclei (AGNs), including AGNs that are deeply buried in gas and dust. We observed 29 merging systems and confirmed at least one AGN in all but one system. However, luminous dual AGNs were detected in only four of the 29 systems (∼14%), despite our method's being sensitive to buried AGNs. For multiple nuclei sources, we compared the estimated AGN luminosities with supermassive black hole (SMBH) masses inferred from large aperture K-band stellar emission photometry in individual nuclei. We found that mass accretion rates onto SMBHs are significantly different among multiple SMBHs, such that larger-mass SMBHs generally show higher mass accretion rates when normalized to SMBH mass. Our results suggest that non-synchronous mass accretion onto SMBHs in gas-and dust-rich infrared luminous merging galaxies hampers the observational detection of kiloparsec-scale multiple active SMBHs. This could explain the significantly smaller detection fraction of kiloparsec-scale dual AGNs when compared with the number expected from simple theoretical predictions. Our results also indicate that mass accretion onto SMBHs is dominated by local conditions, rather than by global galaxy properties, reinforcing the importance of observations to our understanding of how multiple SMBHs are activated and acquire mass in gas-and dust-rich merging galaxies.

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“…Since the suggestion that double-peaked profiles could be produced by binary AGNs (Zhou et al 2004), much attention has been paid to this hypothesis, yet few definite cases are known. The most convincing examples can be found in CXO J1426+35 (Barrows et al 2012), EGSD2 J1420+4259 (Gerke et al 2007), NGC 6240 (Komossa et al 2003), COSMOS J100043+020637 (Comerford et al 2009b), SDSS J0952+2552 (McGurk et al 2011;Fu et al 2012) and so on (see the review in Wang & Zhou 2012, and table 1 in Ge et al 2012). Several systematic searches for AGNs with double-peaked [O III] emission lines have been performed in the DEEP2 survey sample (Gerke et al 2007;Comerford et al 2009a) and in the Sloan Digital Sky Survey (hereafter SDSS) data releases (Xu & Komossa 2009;Wang et al 2009;Liu et al 2010bLiu et al ,2011Smith et al 2010;Ge et al 2012).…”

Section: Introductionmentioning

confidence: 99%

A search for double-peaked narrow emission line galaxies and AGNs in the LAMOST DR1

Shi¹,

Luo²,

Comte³

et al. 2014

Res. Astron. Astrophys.

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LAMOST has released more than two million spectra, which provide the opportunity to search for double-peaked narrow emission line (NEL) galaxies and AGNs. The double-peaked narrow-line profiles can be well modeled by two velocity components, respectively blueshifted and redshifted with respect to the systemic recession velocity. This paper presents 20 double-peaked NEL galaxies and AGNs found from LAMOST DR1 using a search method based on multi-gaussian fit of the narrow emission lines. Among them, 10 have already been published by other authors, either listed as genuine double-peaked NEL objects or as asymmetric NEL objects, the remaining 10 being first discoveries. We discuss some possible origins for double-peaked narrow-line features, as interaction between jet and narrow line regions, interaction with companion galaxies and black hole binaries. Spatially resolved optical imaging and/or follow-up observations in other spectral bands are needed to further discuss the physical mechanisms at work.

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Dual Active Galactic Nuclei: Deprojecting the Binary Cores

Cited by 4 publications

References 31 publications

IDENTIFICATION OF OUTFLOWS AND CANDIDATE DUAL ACTIVE GALACTIC NUCLEI IN SDSS QUASARS ATz= 0.8-1.6

IDENTIFICATION OF OUTFLOWS AND CANDIDATE DUAL ACTIVE GALACTIC NUCLEI IN SDSS QUASARS ATz= 0.8-1.6

SUBARU ADAPTIVE-OPTICS HIGH-SPATIAL-RESOLUTION INFRAREDK- ANDL′-BAND IMAGING SEARCH FOR DEEPLY BURIED DUAL AGNs IN MERGING GALAXIES

A search for double-peaked narrow emission line galaxies and AGNs in the LAMOST DR1

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