The Megamaser Cosmology Project − XII. VLBI imaging of H2O maser emission in three active galaxies and the effect of AGN winds on disc dynamics

Kuo, C. Y.; Braatz, J. A.; Impellizzeri, C. M. V.; Gao, F.; Pesce, Dominic W.; Reid, M. J.; Condon, J. J.; Kamali, F.; Henkel, C.; Greene, Jenny E.

doi:10.1093/mnras/staa2260

Cited by 23 publications

(23 citation statements)

References 93 publications

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“…It was recently found that (Kuo et al 2020) the galaxy Mrk 1 exhibits a double peaked structure of masing particles. Depending on the choice of the gravitational centre, the blue-shifted masers may be consistent with a Keplerian curve, with the red-shifted ones showing evidence of an offset and also being scattered around lower values of line-of-sight velocities.…”

Section: Black Hole Binariesmentioning

confidence: 97%

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Signatures of supermassive black hole binaries on maser systems

Padmanabhan,

Loeb

2022

Preprint

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We illustrate a novel signature of black hole binaries from their effect on the kinematics of water maser emission in their environments. With the help of simulations, we establish the condition for clumps to mase based on their coherence lengths calibrated to those of the known maser galaxy NGC 4258. This is then used to identify masing clumps around a binary black hole system, and quantify the kinematic and spectral differences relative to the single black hole case. For some generic circumstances, blue-shifted masers around a binary black hole are found to preferentially follow the Keplerian rotation curve observed in the single black hole case. The redshifted ones, however, are found to visibly deviate from this relation, and also display more scatter with a tendency towards lower absolute values of the velocity along the line-of-sight. The spectrum of the masers as a function of line-of-sight velocity also shows a double peaked structure, reminiscent of recent observations of systems such as Mrk 1. Our results motivate future prospects for identifying binary black hole candidates with the help of water maser emissions.

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Section: Black Hole Binariesmentioning

confidence: 97%

“…Maser candidates are usually identified by their characteristic spectrum that displays distinct redshifted, systemic and blueshifted components (Kuo et al 2020). The criterion for masing is the presence of a large velocity coherence along the line-of-sight.…”

Section: Introductionmentioning

confidence: 99%

Signatures of supermassive black hole binaries on maser systems

Padmanabhan,

Loeb

2022

Preprint

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“…Disc masers are confirmed by Very Long Baseline Interferometric (VLBI) observations to take place within a few parsecs of the galaxy center, thus theories expect tight M BH -L H 2 O correlation therein. In our analysis, double-featured sources (i.e., galaxies with blueshifted redshifted but no systematic spectra) are considered as discs (see [15] for details on them). For these reasons, it is interesting to study these sub-samples separately.…”

Section: The Sample and Selection Criteriamentioning

confidence: 99%

Water megamaser and central black hole masses in a large sample of galaxies

Farhan¹,

Ercan²,

Tombesi³

2022

Preprint

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Extragalactic water megamaser emissions at 22 GHz have been playing vital roles in astrophysics. The limited detection rate of these masers has been motivating researchers to find clues that can help characterize them. The physical environments masers formed in is still ambiguous, accordingly, statistical studies have been thoroughly used to resolve these favorable environments. In this work, we go through the most essential parameter of Active Galactic Nuclei (AGN), namely, the mass of the central supermassive black hole (M BH ) of the maser host galaxy. We study the correlation between maser luminosity (L H 2 O ) and M BH . The regression line of the relation is also calculated. Additionally, sub-samples of megamasers (MMs), kilomasers (KMs), and disc masers are studied. Our results show a very significant L H 2 O -M BH correlation for our 68 galaxy sample. Unlike the results of previous works, dividing the sample into MMs and KMs gives no privilege of MM galaxies. In opposite to expectation, KMs have weak and low significant L H 2 O -M BH correlation, while MMs show no correlation. The positive correlation in KMs can be explained by the role of AGN therein, while the diversity of MMs types, with some of which are not strongly related to AGN, may explain the correlation missing. The 28 disc maser sample, where tight correlation is expected, surprisingly shows a very weak and low significant L H 2 O -M BH correlation. Future VLBI studies will eventually lead to a certain classification of a good number of maser galaxies, which is essential to clearly establish the L H 2 O -M BH relation.

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“…A maser disk with Keplerian rotation could have a non-negligible disk mass comparable to the black hole mass (Huré et al, 2011), and the effects of disk self-gravity might lead to large systematic errors in the derivation of the black hole mass (Kuo et al, 2018). Disturbed morphology and kinematics are an ubiquitous feature of maser systems especially above Eddington ratio λ Edd ≳ 0.1 (Kuo et al, 2020).…”

Section: Bh Measurements In Active Galactic Nucleimentioning

confidence: 99%

Past, Present, and Future of the Scaling Relations of Galaxies and Active Galactic Nuclei

D’Onofrio

Marziani

Chiosi

2021

Front. Astron. Space Sci.

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We review the properties of the established Scaling Relations (SRs) of galaxies and active galactic nuclei (AGN), focusing on their origin and expected evolution back in time, providing a short history of the most important progresses obtained up to now and discussing the possible future studies. We also try to connect the observed SRs with the physical mechanisms behind them, examining to what extent current models reproduce the observational data. The emerging picture clarifies the complexity intrinsic to the galaxy formation and evolution process as well as the basic uncertainties still affecting our knowledge of the AGN phenomenon. At the same time, however, it suggests that the detailed analysis of the SRs can profitably contribute to our understanding of galaxies and AGN.

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The Megamaser Cosmology Project − XII. VLBI imaging of H2O maser emission in three active galaxies and the effect of AGN winds on disc dynamics

Cited by 23 publications

References 93 publications

Signatures of supermassive black hole binaries on maser systems

Signatures of supermassive black hole binaries on maser systems

Water megamaser and central black hole masses in a large sample of galaxies

Past, Present, and Future of the Scaling Relations of Galaxies and Active Galactic Nuclei

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