Imaging extended emission-line regions of obscured AGN with the Subaru Hyper Suprime-Cam Survey
| Autor: | Sean D. Johnson, Alisabeth A Marsteller, Michael A. Strauss, Ai-Lei Sun, Yoshiki Matsuoka, Nadia L. Zakamska, Andy D. Goulding, Song Huang, Yoshiki Toba, Tohru Nagao, Jenny E. Greene, Toshihiro Kawaguchi |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Active galactic nucleus 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena media_common.quotation_subject Doubly ionized oxygen FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Photoionization Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Redshift Spectral line Space and Planetary Science Sky Astrophysics of Galaxies (astro-ph.GA) Excited state 0103 physical sciences Emission spectrum 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 480:2302-2323 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/sty1394 |
| Popis: | Narrow-line regions excited by active galactic nuclei (AGN) are important for studying AGN photoionization and feedback. Their strong [O III] lines can be detected with broadband images, allowing morphological studies of these systems with large-area imaging surveys. We develop a new technique to reconstruct the [O III] images using the Subaru Hyper Suprime-Cam (HSC) Survey aided with spectra from the Sloan Digital Sky Survey (SDSS). The technique involves a careful subtraction of the galactic continuum to isolate emission from the [O III]$\lambda$5007 and [O III]$\lambda$4959 lines. Compared to traditional targeted observations, this technique is more efficient at covering larger samples with less dedicated observational resources. We apply this technique to an SDSS spectroscopically selected sample of 300 obscured AGN at redshifts 0.1 - 0.7, uncovering extended emission-line region candidates with sizes up to tens of kpc. With the largest sample of uniformly derived narrow-line region sizes, we revisit the narrow-line region size-luminosity relation. The area and radii of the [O III] emission-line regions are strongly correlated with the AGN luminosity inferred from the mid-infrared (15 $\mu$m rest-frame) with a power-law slope of $0.62^{+0.05}_{-0.06} \pm 0.10$ (statistical and systemic errors), consistent with previous spectroscopic findings. We discuss the implications for the physics of AGN emission-line region and future applications of this technique, which should be useful for current and next-generation imaging surveys to study AGN photoionization and feedback with large statistical samples. Comment: 20 pages, 13 figures, MNRAS submitted |
| Databáze: | OpenAIRE |
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