2016/12/11 by Tong Liu, Liu, Tong, Luming Sun +5
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae
paper · pdf · doi:10.48550/arxiv.1612.03391
openalex publication_date 2016/12/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
SDSS J072910.34+333634.3 is a reddened quasar at z=0.96. The archivel Keck/ESI spectrum and our new P200/TripleSpec spectrum reveal an absorption line system in He I*, Ca II H&K and Na ID. The absorption line system has a width of ∼600 km/s and a blueshift velocity of ∼800 km/s relative to the core of narrow emission lines, indicating an outflow. Using the Ca II doublet, we determined that the outflowing gas covers ∼70% of the continuum. On the other hand, the HST/ACS image which taken in rest-frame 4130 Å show that the fraction of the quasar emission in ESI aperture was 8 kpc2. The strong Na&Ca absorption suggests that the absorbing gas is thick and mostly neutral, which is also supported by dust extinction AV∼3. Using the best-estimated hydrogen column density NH∼3×1022 cm-2, the total mass of the outflowing gas is >3×109 M_\odot. The outflow is likely to be driven by AGN because of the ∼800 km/s blueshift velocity, suggesting SDSS J072910.34+333634.3 is undergoing one of the most violent AGN feedback we have seen. In the future, one can find more such massive neutral gas outflows in other reddened quasars using similar method, and this can shed new light on the study of AGN feedback.