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NGC 1275: an outlier of the black hole-host scaling relations

NGC 1275: an outlier of the black hole-host scaling relations
NGC 1275: an outlier of the black hole-host scaling relations
The active galaxy NGC 1275 lies at the center of the Perseus cluster of galaxies, being an archetypal BH-galaxy system that is supposed to fit well with the MBH-host scaling relations obtained for quiescent galaxies. Since it harbors an obscured AGN, only recently our group has been able to estimate its black hole mass. Here our aim is to pinpoint NGC 1275 on the less dispersed scaling relations, namely the MBH-σ⋆ and MBH−Lbul planes. Starting from our previous work (Ricci et al., 2017a), we estimate that NGC 1275 falls well outside the intrinsic dispersion of the MBH-σ⋆ plane being 1.2 dex (in black hole mass) displaced with respect to the scaling relations. We then perform a 2D morphological decomposition analysis on Spitzer/IRAC images at 3.6 μm and find that, beyond the bright compact nucleus that dominates the central emission, NGC 1275 follows a de Vaucouleurs profile with no sign of significant star formation nor clear merger remnants. Nonetheless, its displacement on the MBH−L3.6,bul plane with respect to the scaling relation is as high as observed in the MBH-σ⋆. We explore various scenarios to interpret such behaviors, of which the most realistic one is the evolutionary pattern followed by NGC 1275 to approach the scaling relation. We indeed speculate that NGC 1275 might be a specimen for those galaxies in which the black holes adjusted to its host.
2296-987X
Sani, Eleonora
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Ricci, Federica
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Le Franca, Fabio
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Bianchi, Stefano
a6e73c8a-434a-43c4-9798-2cdecf55bf94
Bongiorno, Angela
a5094b8a-1431-423e-99e5-447ab6b873c5
Brusa, Marcella
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Marconi, Alessandro
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Onori, Francesca
ea767faa-5e8a-4744-a10c-df4fb6588814
Shankar, F
b10c91e4-85cd-4394-a18a-d4f049fd9cdb
Vignali, Cristian
e99bb784-eb5d-4502-bc28-751108184c4e
Sani, Eleonora
9a4730f8-926a-42d4-a71b-236aba0cd412
Ricci, Federica
d41cae06-35f0-4f1b-8d38-87366541c650
Le Franca, Fabio
3251370f-94ee-46c8-a4f6-8ef9611686b8
Bianchi, Stefano
a6e73c8a-434a-43c4-9798-2cdecf55bf94
Bongiorno, Angela
a5094b8a-1431-423e-99e5-447ab6b873c5
Brusa, Marcella
74b5f085-00ab-4e11-8de3-5d6c5575f0d0
Marconi, Alessandro
0186d4a6-7bc8-44dd-93a1-42edb4a5c910
Onori, Francesca
ea767faa-5e8a-4744-a10c-df4fb6588814
Shankar, F
b10c91e4-85cd-4394-a18a-d4f049fd9cdb
Vignali, Cristian
e99bb784-eb5d-4502-bc28-751108184c4e

Sani, Eleonora, Ricci, Federica, Le Franca, Fabio, Bianchi, Stefano, Bongiorno, Angela, Brusa, Marcella, Marconi, Alessandro, Onori, Francesca, Shankar, F and Vignali, Cristian (2018) NGC 1275: an outlier of the black hole-host scaling relations. Frontiers in Astronomy and Space Sciences. (doi:10.3389/fspas.2018.00002).

Record type: Article

Abstract

The active galaxy NGC 1275 lies at the center of the Perseus cluster of galaxies, being an archetypal BH-galaxy system that is supposed to fit well with the MBH-host scaling relations obtained for quiescent galaxies. Since it harbors an obscured AGN, only recently our group has been able to estimate its black hole mass. Here our aim is to pinpoint NGC 1275 on the less dispersed scaling relations, namely the MBH-σ⋆ and MBH−Lbul planes. Starting from our previous work (Ricci et al., 2017a), we estimate that NGC 1275 falls well outside the intrinsic dispersion of the MBH-σ⋆ plane being 1.2 dex (in black hole mass) displaced with respect to the scaling relations. We then perform a 2D morphological decomposition analysis on Spitzer/IRAC images at 3.6 μm and find that, beyond the bright compact nucleus that dominates the central emission, NGC 1275 follows a de Vaucouleurs profile with no sign of significant star formation nor clear merger remnants. Nonetheless, its displacement on the MBH−L3.6,bul plane with respect to the scaling relation is as high as observed in the MBH-σ⋆. We explore various scenarios to interpret such behaviors, of which the most realistic one is the evolutionary pattern followed by NGC 1275 to approach the scaling relation. We indeed speculate that NGC 1275 might be a specimen for those galaxies in which the black holes adjusted to its host.

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Accepted/In Press date: 11 January 2018
e-pub ahead of print date: 6 February 2018

Identifiers

Local EPrints ID: 419127
URI: http://eprints.soton.ac.uk/id/eprint/419127
ISSN: 2296-987X
PURE UUID: ddebf548-a2e6-4fe9-8ef6-379cee36005f

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Date deposited: 06 Apr 2018 16:30
Last modified: 30 Jan 2020 17:40

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Contributors

Author: Eleonora Sani
Author: Federica Ricci
Author: Fabio Le Franca
Author: Stefano Bianchi
Author: Angela Bongiorno
Author: Marcella Brusa
Author: Alessandro Marconi
Author: Francesca Onori
Author: F Shankar
Author: Cristian Vignali

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