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Probing the physics of narrow-line regions in active galaxies. III. accretion and cocoon shocks in the liner NGC 1052

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dc.contributor.author Dopita, M. A
dc.contributor.author Ho, I-Ting
dc.contributor.author Dressel, L. L
dc.contributor.author Sutherland, R
dc.contributor.author Kewley, L
dc.contributor.author Davies, R
dc.contributor.author Hampton, E
dc.contributor.author Shastri, P
dc.contributor.author Kharb, P
dc.contributor.author Jose, Jessy
dc.contributor.author Bhatt, H. C
dc.contributor.author Ramya, S
dc.contributor.author Scharwachter, J
dc.contributor.author Jin, C
dc.contributor.author Banfield, J
dc.contributor.author Zaw, I
dc.contributor.author James, B
dc.contributor.author Juneau, S
dc.contributor.author Srivastava, S
dc.date.accessioned 2020-11-10T02:27:28Z
dc.date.available 2020-11-10T02:27:28Z
dc.date.issued 2015-03-01
dc.identifier.citation The Astrophysical Journal, Vol. 801, No. 1, 42 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6722
dc.description Open Access © The American Astronomical Society http://dx.doi.org/10.1088/0004-637X/801/1/42 en_US
dc.description.abstract We present Wide Field Spectrograph integral field spectroscopy and Hubble Space Telescope Faint Object Spectrograph spectroscopy for the low-ionization nuclear emission line region (LINER) galaxy NGC 1052. We infer the presence of a turbulent accretion flow forming a small-scale accretion disk. We find a large-scale outflow and ionization cone along the minor axis of the galaxy. Part of this outflow region is photoionized by the active galactic nucleus and shares properties with the extended narrow-line region of Seyfert galaxies, but the inner ($R\lesssim 1.0$'') accretion disk and the region around the radio jet appear shock excited. The emission-line properties can be modeled by a "double-shock" model in which the accretion flow first passes through an accretion shock in the presence of a hard X-ray radiation, and the accretion disk is then processed through a cocoon shock driven by the overpressure of the radio jets. This model explains the observation of two distinct densities (~104 and ~106 cm−3) and provides a good fit to the observed emission-line spectrum. We derive estimates for the velocities of the two shock components and their mixing fractions, the black hole mass, and the accretion rate needed to sustain the LINER emission and derive an estimate for the jet power. Our emission-line model is remarkably robust against variation of input parameters and hence offers a generic explanation for the excitation of LINER galaxies, including those of spiral type such as NGC 3031 (M81). en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Black hole physics en_US
dc.subject Galaxies: individual (NGC 1052, M81) en_US
dc.subject Galaxies: jets en_US
dc.subject Galaxies: nuclei en_US
dc.subject Shock waves en_US
dc.title Probing the physics of narrow-line regions in active galaxies. III. accretion and cocoon shocks in the liner NGC 1052 en_US
dc.type Article en_US


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