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# GEMINI LONG-SLIT OBSERVATIONS OF LUMINOUS OBSCURED QUASARS: FURTHER EVIDENCE FOR AN UPPER LIMIT ON THE SIZE OF THE NARROW-LINE REGION

## Author(s): Hainline, Kevin N; Hickox, Ryan C; Greene, Jenny E.; Myers, Adam D; Zakamska, Nadia L; et al

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 Abstract: We examine the spatial extent of the narrow-line regions (NLRs) of a sample of 30 luminous obscured quasars at 0.4 < z < 0.7 observed with spatially resolved Gemini-N GMOS long-slit spectroscopy. Using the [O III] lambda 5007 emission feature, we estimate the size of the NLR using a cosmology-independent measurement: the radius where the surface brightness falls to 10(-15) erg s(-1) cm(-2) arcsec(-2). We then explore the effects of atmospheric seeing on NLR size measurements and conclude that direct measurements of the NLR size from observed profiles are too large by 0.1-0.2 dex on average, as compared to measurements made to best-fit Sersic or Voigt profiles convolved with the seeing. These data, which span a full order of magnitude in IR luminosity (log (L-8 mu m/erg s(-1)) = 44.4-45.4), also provide strong evidence that there is a flattening of the relationship between NLR size and active galactic nucleus luminosity at a seeing-corrected size of similar to 7 kpc. The objects in this sample have high luminosities which place them in a previously under-explored portion of the size-luminosity relationship. These results support the existence of a maximal size of the NLR around luminous quasars; beyond this size, there is either not enough gas or the gas is over-ionized and does not produce enough [O III] lambda 5007 emission. Publication Date: 20-May-2014 Electronic Publication Date: 5-May-2014 Citation: Hainline, Kevin N, Hickox, Ryan C, Greene, Jenny E, Myers, Adam D, Zakamska, Nadia L, Liu, Guilin, Liu, Xin. (2014). GEMINI LONG-SLIT OBSERVATIONS OF LUMINOUS OBSCURED QUASARS: FURTHER EVIDENCE FOR AN UPPER LIMIT ON THE SIZE OF THE NARROW-LINE REGION. ASTROPHYSICAL JOURNAL, 787 (10.1088/0004-637X/787/1/65 DOI: doi:10.1088/0004-637X/787/1/65 ISSN: 0004-637X EISSN: 1538-4357 Related Item: https://ui.adsabs.harvard.edu/abs/2014ApJ...787...65H/abstract Type of Material: Journal Article Journal/Proceeding Title: ASTROPHYSICAL JOURNAL Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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