Medium-resolution Optical and Near-Infrared Spectral Atlas of 16 2MASS-selected NIR-red Active Galactic Nuclei at $z\sim 0.3$

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 $z \sim 0.3$\mathrm{.}WefittheH$\beta$,H$\alpha$,P$\beta$,andP$\alpha$ 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 $g^{\mathrm{\prime }}-K<5$ 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 ($\lambda_{\rm Edd}$)\mathrm{.}ThemedianEddingtonratiosofnineNIR-redAGNs($\log (\lambda_{\rm Edd}) \simeq -0.654 \pm 0.176$) are only mildly higher than those of unobscured type 1 AGNs ($\log ({\lambda }_{\mathrm{E}\mathrm{d}\mathrm{d}})\simeq -0.961\pm 0.008$). Moreover, we find that the $M_{\mathrm{B}\mathrm{H}}$–${\sigma }_{\ast }$ 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.