Skip to Main content Skip to Navigation
Journal articles

Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS

Abstract : We present the ionized gas properties of infrared (IR)-bright dust-obscured galaxies (DOGs) that show an extreme optical/IR color, {(i-[22])}{AB}> 7.0, selected with the Sloan Digital Sky Survey (SDSS) and Wide-field Infrared Survey Explorer (WISE). For 36 IR-bright DOGs that show [O III]λ5007 emission in the SDSS spectra, we performed a detailed spectral analysis to investigate their ionized gas properties. In particular, we measured the velocity offset (the velocity with respect to the systemic velocity measured from the stellar absorption lines) and the velocity dispersion of the [O III] line. We found that the derived velocity offset and dispersion of most IR-bright DOGs are larger than those of Seyfert 2 galaxies (Sy2s) at z< 0.3, meaning that the IR-bright DOGs show relatively strong outflows compared to Sy2s. This can be explained by the difference in IR luminosity contributed from active galactic nuclei, {L}{IR} (AGN), because we found that (i) {L}{IR} (AGN) correlates with the velocity offset and dispersion of [O III] and (ii) our IR-bright DOG sample has larger {L}{IR} (AGN) than Sy2s. Nevertheless, the fact that about 75% IR-bright DOGs have a large (>300 km s-1) velocity dispersion, which is a larger fraction compared to other AGN populations, suggests that IR-bright DOGs are good laboratories to investigate AGN feedback. The velocity offset and dispersion of [O III] and [Ne III]λ3869 are larger than those of [O II]λ3727, which indicates that the highly ionized gas tends to show stronger outflows.
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03747423
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Monday, August 8, 2022 - 11:33:50 AM
Last modification on : Tuesday, August 9, 2022 - 3:45:02 AM

Links full text

Identifiers

Citation

Yoshiki Toba, Hyun-Jin Bae, Tohru Nagao, Jong-Hak Woo, Wei-Hao Wang, et al.. Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS. The Astrophysical Journal, 2017, 850, ⟨10.3847/1538-4357/aa918a⟩. ⟨insu-03747423⟩

Share

Metrics

Record views

6