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http://hdl.handle.net/20.500.12386/28506
Titolo: | Revealing the Broad Line Region of NGC 1275: The Relationship to Jet Power | Autori: | Punsly, Brian MARZIANI, Paola Bennert, Vardha N. Nagai, Hiroshi Gurwell, Mark A. |
Data pubblicazione: | 2018 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 869 | Fascicolo: | 2 | Da pagina:: | 143 | Abstract: | NGC 1275 is one of the most conspicuous active galactic nuclei (AGN) in the local universe. The radio jet currently emits a flux density of ∼10 Jy at ∼1 mm wavelengths, down from the historic high of ∼65 Jy in 1980. Yet, the nature of the AGN in NGC 1275 is still controversial. It has been debated whether this is a broad emission line (BEL) Seyfert galaxy, an obscured Seyfert galaxy, a narrow line radio galaxy, or a BL Lac object. We clearly demonstrate a persistent Hβ BEL over the last 35 yr with a full width at half maximum (FWHM) of 4150-6000 km s<SUP>-1</SUP>. We also find a prominent Pα BEL (FWHM ≈ 4770 km s<SUP>-1</SUP>) and a weak C IV BEL (FWHM ≈ 4000 km s<SUP>-1</SUP>), Hβ/C IV ≈ 2. A far-UV Hubble Space Telescope observation during suppressed jet activity reveals a low luminosity continuum. The Hβ BEL luminosity is typical of broad line Seyfert galaxies with similar far-UV luminosity. X-ray observations indicate a softer ionizing continuum than what would be expected for a broad line Seyfert galaxy with similar far-UV luminosity. This is the opposite of the expectation of advection-dominated accretion. The AGN continuum appears to be thermal emission from a low luminosity, optically thick, accretion flow with a low Eddington ratio, ∼0.0001. The soft, weak, ionizing continuum is consistent with the relatively weak C IV BEL. Evidence that the BEL luminosity is correlated with the jet millimeter-wave luminosity is presented. It appears that the accretion rate regulates jet power. | URI: | http://hdl.handle.net/20.500.12386/28506 | URL: | https://arxiv.org/pdf/1810.11716.pdf https://iopscience.iop.org/article/10.3847/1538-4357/aaec75 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aaec75 | Bibcode ADS: | 2018ApJ...869..143P | Fulltext: | open |
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