Insight Into Active Galactic Nucleus and Host Galaxy Co-Evolution From Hard X-Ray Emission

Wang, J.; Zhou, Xu; Wei, J. Y.

doi:10.1088/0004-637x/768/2/176

Cited by 10 publications

(18 citation statements)

References 169 publications

(185 reference statements)

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“…The observed broad Hα emission demonstrates the existence of an underlying AGN's continuum leaking from the edge of the torus according to the unified model (e.g., Antonucci 1993). The leaking powerlaw continuum impacts the spectral shape at the blue end, which always results in an underestimate of D n (4000) index, and consequently a relatively younger stellar population if the contamination is ignored (e.g., Cid Fernandes & Terlevich 1995;Storchi-Bergmann et al 2000;Cid Fernandes et al 2004;Wang et al 2013). Strictly speaking, the best way to remove the underlying AGN's continuum is to model the observed continuum by a linear combination of a power-law continuum and the used eigenspectra.…”

Section: Stellar Features Removal and Stellar Populationmentioning

confidence: 99%

Role of feedback in AGN-host coevolution: A study from partially obscured active galactic nuclei

Wang¹

2015

New Astronomy

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Partially obscured AGNs within a redshift range z = 0.011 ∼ 0.256 are used to re-study the role of feedback in the AGN-host coevolution issue in terms of their [OIII]λ5007 emission line profile. The spectra of these objects enable us to determine the AGN's accretion properties directly from their broad Hα emission. This is essential for getting rid of the "circular reasoning" in our previous study of narrow emission-line galaxies, in which the [OIII] emission line was used not only as a proxy of AGN's bolometric luminosity, but also as a diagnostic of outflow. In addition, the measurement of D n (4000) index is improved by removing an underlying AGN's continuum according to the corresponding broad Hα emission. With these improvements, we confirm and reinforce the correlation between L/L Edd and stellar population age. More important is that this correlation is found to be related to both [OIII] line blue asymmetry and bulk blueshift velocity, which suggests a linkage between SMBH growth and host star formation through the feedback process. The current sample of partially obscured AGNs shows that the composite galaxies have younger host stellar population, higher Eddington ratio, less significant [OIII] blue wing and smaller bulk [OIII] line shift than do the Seyfert galaxies .

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Section: Stellar Features Removal and Stellar Populationmentioning

confidence: 99%

Role of feedback in AGN-host coevolution: A study from partially obscured active galactic nuclei

Wang¹

2015

New Astronomy

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“…Arp 54 0.0433 0.015 0.547 0.637 0.024201 Unclass Veilleux et al 1995; (2) Coziol et al 1994; (3) Buchanan et al 2006;(4) Parisi et al 2012;(5) Osterbrock & Phillips 1977;(6) 6dF Galaxy Survey; (7) Fraquelli et al 2000;(8) Lewis et al 2011;(9 Véron-Cetty & Véron 2001;(10) Greene et al 2010;(11) Ho et al 1997;(12) Thornton et al 2009;(13) SDSS;(14) LaMassa et al 2009;(15) Brightman & Nandra 2011b;(16) Wang et al 2013;(17) Corbett et al 2003;(18) Masetti et al 2008;(19) Veilleux et al 1999;(20) Greenhill et al 2002;(21) Updated Zwicky catalog (22) Coziol et al 2004;(23) Ricci et al 2014b;(24) Kewley et al 2001;(25) Mauch & Sadler 2007;(26) Hunt & Malkan 2004;(27) Afonso et al 2005 Eguchi et al 2011;(4) Severgnini et al 2012;(5) Lewis et al 2011;(6) Rasmussen et al 2012;(7)…”

Section: Discussionunclassified

A NEW SAMPLE OF OBSCURED AGNs SELECTED FROM THEXMM-NEWTONANDAKARISURVEYS

Terashima

Hirata

Awaki

et al. 2015

ApJ

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We report a new sample of obscured active galactic nuclei (AGNs) selected from the XMM-Newton serendipitous source and AKARI point-source catalogs. We match X-ray sources with infrared (18 and 90 µm) sources located at |b| > 10 • to create a sample consisting of 173 objects. Their optical classifications and absorption column densities measured by X-ray spectra are compiled and study efficient selection criteria to find obscured AGNs. We apply the criteria (1) X-ray hardness ratio defined by using the 2 − 4.5 keV and 4.5 − 12 keV bands > −0.1 and (2) EPIC-PN count rate (CR) in the 0.2 − 12 keV to infrared flux ratio CR/F 90 < 0.1 or CR/F 18 < 1, where F 18 and F 90 are infrared fluxes at 18 and 90 µm in Jy, respectively, to search for obscured AGNs. X-ray spectra of 48 candidates, for which no X-ray results have been published, are analyzed and X-ray evidence for the presence of obscured AGNs such as a convex shape X-ray spectrum indicative of absorption of N H ∼ 10 22−24 cm −2 , a very flat continuum, or a strong Fe-K emission line with an equivalent width of > 700 eV is found in 26 objects. Six among them are classified as Compton-thick AGNs, and four are represented by either Compton-thin or Compton-thick spectral models. The success rate of finding obscured AGNs combining our analysis and the literature is 92% if the 18 µm condition is used. Of the 26 objects, 4 are optically classified as an H II nucleus and are new "elusive AGNs" in which star formation activity likely overwhelms AGN emission in the optical and infrared bands.

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“…Kewley et al (2006) through their photoionization simulations. In addition, Wang et al (2013) recently reported a direct correlation between these two narrow-line ratios and the spectral slope of AGNs at high energy.…”

Section: Samplementioning

confidence: 94%

Possible evidence of destroying small PAH particles by radiation from AGNs

Feng¹,

Wang²,

Wei³

2015

Res. Astron. Astrophys.

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The issue of destroying small polycyclic aromatic hydrocarbon (PAH) particles by radiation from AGNs is examined through optical narrow-emission line ratios of a sample of type II AGNs. We find that narrow-line ratios [OI]λ6300/Hα and [SII]λ6716, λ6731/Hα have prominent correlations with the PAH 11.3/7.7 ratio in our selected sample of AGNs. Because of the marginal (and in some cases no) dependence of the PAH ratio on the gas metallicity, a possible explanation for the correlations is the destruction of small PAH particles by the hard ionizing field associated with the AGNs.

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Insight Into Active Galactic Nucleus and Host Galaxy Co-Evolution From Hard X-Ray Emission

Cited by 10 publications

References 169 publications

Role of feedback in AGN-host coevolution: A study from partially obscured active galactic nuclei

Role of feedback in AGN-host coevolution: A study from partially obscured active galactic nuclei

A NEW SAMPLE OF OBSCURED AGNs SELECTED FROM THEXMM-NEWTONANDAKARISURVEYS

Possible evidence of destroying small PAH particles by radiation from AGNs

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