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Medium-resolution Optical and Near-Infrared Spectral Atlas of 16 2MASS-selected NIR-red Active Galactic Nuclei at $z sim 0.3$ | | Dohyeong Kim
; Myungshin Im
; Gabriela Canalizo
; Minjin Kim
; Ji Hoon Kim
; Jong-Hak Woo
; Yoon Chan Taak
; Jae-Woo Kim
; Mariana Lazarova
; | | Date: |
17 Dec 2018 | | Abstract: | We present medium-resolution spectra ($R sim 2000$--4000) at
0.4--1.0,$mu$m and 0.7--2.5,$mu$m of 16 active galactic nuclei (AGNs)
selected with red color in the near-infrared (NIR) of $J - K > 2.0$ mag at $z
sim 0.3$. We fit the H$eta$, H$alpha$, P$eta$, and P$alpha$ lines from
these spectra to obtain their luminosities and line widths. We derive the
$E(B-V)$ color excess values of the NIR-red AGNs using two methods, one based
on the line-luminosity ratios and another based on the continuum slopes. The
two $E(B-V)$ values agree with each other at rms dispersion $sim$ 0.249. About
half of the NIR-red AGNs have $g’-K < 5$ magnitude, and we find that these NIR
red, but blue in optical-NIR AGNs, have $E(B-V) sim 0$, suggesting that a
significant fraction of the NIR color-selected red AGNs are unobscured or only
mildly obscured. After correcting for the dust extinction, we estimate the
black hole (BH) masses and the bolometric luminosities of the NIR-red AGNs
using the Paschen lines to calculate their Eddington ratios ($lambda_{
m
Edd}$). The median Eddington ratios of nine NIR-red AGNs ($log (lambda_{
m
Edd}) simeq -0.654 pm 0.176$) are only mildly higher than those of unobscured
type 1 AGNs ($log (lambda_{
m Edd}) simeq -0.961 pm 0.008$). Moreover, we
find that the $M_{
m BH}$--$sigma_{ast}$ relation for three NIR-red AGNs is
consistent with that of unobscured type 1 AGNs at similar redshift. These
results suggest that the NIR red color selection alone is not effective at
picking up dusty, intermediate-stage AGNs. | | Source: | arXiv, 1812.6991 | | Services: | Forum | Review | PDF | Favorites | |
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