Emission-line spectra of seven Arakelian galaxies

Osterbrock, Donald E.; Phillips, M. M.

doi:10.1086/130110

Cited by 21 publications

(12 citation statements)

References 4 publications

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“…Ark 120 is a nearby Seyert 1 galaxy (e.g. Osterbrock & Phillips 1977) that is well-studied in the X-ray band. This source shows little or no evidence for X-ray absorption (e.g.…”

Section: A2 Ark 120mentioning

confidence: 99%

High Density Reflection Spectroscopy – II. The density of the inner black hole accretion disc in AGN

Jiang

Fabian

Dauser

et al. 2019

Monthly Notices of the Royal Astronomical Society

112

111

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We present a high density disc reflection spectral analysis of a sample of 17 Seyfert 1 galaxies to study the inner disc densities at different black hole mass scales and accretion rates. All the available XMM-Newton observations in the archive are used. OM observations in the optical/UV band are used to estimate their accretion rates. We find that 65% of sources in our sample show a disc density significantly higher than n e = 10 15 cm −3 , which was assumed in previous reflection-based spectral analyses. The best-fit disc densities show an anti-correlation with black hole mass and mass accretion rate. High density disc reflection model can successfully explain the soft excess emission and significantly reduce inferred iron abundances. We also compare our black hole spin and disc inclination angle measurements with previous analyses.

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“…Ark 120 is a nearby Seyert 1 galaxy (e.g. Osterbrock & Phillips 1977) that is well-studied in the X-ray band. This source shows little or no evidence for X-ray absorption (e.g.…”

Section: A2 Ark 120mentioning

confidence: 99%

High Density Reflection Spectroscopy – II. The density of the inner black hole accretion disc in AGN

Jiang

Fabian

Dauser

et al. 2019

Monthly Notices of the Royal Astronomical Society

112

111

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“…Asymmetric Hβ line profiles are not new in type 1 AGN spectra: both red and blue asymmetries have been observed in all kind of AGNs (e.g. Capriotti, Foltz & Byard , ; Peterson, Korista & Cota ; Stirpe ; Romano et al ; Véron‐Cetty, Véron & Gonçalves ), as well as profile variability (Osterbrock & Phillips ; Peterson ; Stirpe, de Bruyn & van Groningen ). Several kinematic models have been proposed to explain such features in broad Balmer spectra of AGNs, including radial inflow or outflow, different geometries and multiple‐component broad‐line regions (BLRs; e.g.…”

Section: Optical Spectroscopymentioning

confidence: 99%

B2 0954+25A: a typical Fermi blazar or a γ-ray loud Narrow Line Seyfert 1≟

Calderone

Ghisellini

Colpi

et al. 2012

Monthly Notices of the Royal Astronomical Society

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B2 0954+25A, detected by the Fermi satellite, is a blazar with interesting observational properties: it has been observed to transit from a jet-dominated to a disc-dominated state; its radio spectrum appears flat at all observing frequencies (down to 74 MHz); optically, the Hβ line profile is asymmetric. The flatness of the radio spectrum suggests that the isotropic emission from radio lobes is very weak, despite the large size of its jet ( 500 kpc). Its broadband spectral energy distribution is surprisingly similar to that of the prototypical γ -ray, radio-loud, type 1 narrow-line Seyfert (γ -NLS1) galaxy PMN J0948+0022. In this work, we revisit the mass estimates of B2 0954+25A considering only the symmetric component of the Hβ line and find (1-3) × 10 8 M . In light of our composite analysis, we propose to classify the source as a transition object between the classes of flat spectrum radio quasars and γ -NLS1 galaxies. A comparison with two members of each class (3C 273 and PMN J0948+0022) is discussed.

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“…MRK1034 NED1 = Akn80: this has not a Seyfert like optical spectrum (Osterbrock & Phillips 1977). We classify it as a non-Sy (IRS spectrum in paper I).…”

Section: A Classification: Notes On Individual Objectsmentioning

confidence: 99%

SPITZER-IRS HIGH-RESOLUTION SPECTROSCOPY OF THE 12 μm SEYFERT GALAXIES. II. RESULTS FOR THE COMPLETE DATA SET

Tommasin

Spinoglio

Malkan

et al. 2010

ApJ

117

262

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We present our Spitzer IRS spectroscopic survey from 10µm to 37µm of the Seyfert galaxies of the 12µm Galaxy Sample, collected in high resolution mode (R∼ 600). The new spectra of 61 galaxies, together with the data we already published, gives us a total of 91 12µm Seyfert galaxies observed, out of 112. We discuss the mid-IR emission lines and features of the Seyfert galaxies, using an improved AGN classification scheme: instead of adopting the usual classes of Seyfert 1's and Seyfert 2's, we use the spectropolarimetric data from the literature to divide the objects into categories "AGN 1" and "AGN 2", where AGN 1's include all broad-line objects, including the Seyfert 2's showing hidden broad lines in polarized light. The remaining category, AGN 2's contains only Seyferts with no detectable broad lines in either direct or polarized spectroscopy. We present various mid-IR observables, such as ionization-sensitive and density-sensitive line ratios, the PAH 11.25µm feature and the H 2 S(1) rotational line equivalent widths, the (60µm -25µm) spectral index and the source extendedness at 19µm, to characterize similarities and differences in the AGN populations, in terms of AGN dominance versus star formation dominance.We find that the mid-IR emission properties characterize all the AGN 1's objects as a single family, with strongly AGN-dominated spectra. In contrast, the AGN 2's can be divided in two groups, the first one with properties similar to the AGN 1's except without detected broad lines, and the second with properties similar to the non-Seyfert galaxies, such as LINERs or starburst galaxies.We computed a semianalytical model to estimate the AGN and the starburst contributions to the mid-IR galaxy emission at 19µm. For 59 galaxies with appropriate data, we can separate the 19µm emission into AGN and starburst components using the measured mid-IR spectral features. We use these to quantify the brightness thresholds that an AGN must meet to satisfy our classifications: AGN 1 have an AGN contribution ≥ 73 % and AGN 2 ≥ 45 % of their total emission at 19µm.The detection of [NeV] lines turns out to be an almost perfect signature of energy production by an AGN. Only 4 (∼ 7.5% percent) of 55 AGN 1 and 2 (10% percent) out of 20 AGN 2 do not have [NeV] 14.3µm down to a flux limit of ∼ 4 × 10 −15 ergs −1 cm −2 . We present mean spectra of the various AGN categories. Passing from AGN-dominated to starburst-dominated objects, the continuum steepens, especially at wavelengths shorter than 20µm, while the PAH feature increases in its equivalent width and the high ionization lines decrease.We estimate H 2 mass and excitation temperature through the measurement of the S(1) rotational line of this molecule. Finally we derive the first local luminosity functions for the brighest mid-infrared lines and the PAH feature at 11.25µm. No statistical difference is apparent in the space densities for Seyfert 1's and 2's of a given line luminosity, nor for the new classes of AGN 1's and 2's. We use the correlation between [Ne V] line ...

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Emission-line spectra of seven Arakelian galaxies

Cited by 21 publications

References 4 publications

High Density Reflection Spectroscopy – II. The density of the inner black hole accretion disc in AGN

High Density Reflection Spectroscopy – II. The density of the inner black hole accretion disc in AGN

B2 0954+25A: a typical Fermi blazar or a γ-ray loud Narrow Line Seyfert 1≟

SPITZER-IRS HIGH-RESOLUTION SPECTROSCOPY OF THE 12 μm SEYFERT GALAXIES. II. RESULTS FOR THE COMPLETE DATA SET

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