Outflow in Overlooked Luminous Quasar: Subaru Observations of AKARI J1757+5907

TL;DR

This paper reports Subaru observations of a luminous quasar with a significant outflow, providing detailed measurements of its properties and implications for galaxy evolution and intra-cluster medium enrichment.

Contribution

The study presents the first detailed analysis of outflow properties in the quasar AKARI J1757+5907 using high-resolution spectra and photoionization modeling.

Findings

Outflow located at at least 3.7 kpc from the quasar

Mass flow rate of approximately 70 solar masses per year

Kinetic luminosity of about 2.0 x 10^{43} ergs per second

Abstract

We present Subaru observations of the newly discovered luminous quasar AKARI J1757+5907, which shows an absorption outflow in its spectrum. The absorption consists of 9 distinct troughs, and our analysis focuses on the troughs at ~ -1000$ km s^{-1} for which we can measure accurate column densities of He I*, Fe II and Mg II. We use photoionization models to constrain the ionization parameter, total hydrogen column density, and the number density of the outflowing gas. These constraints yield lower limits for the distance, mass flow rate and kinetic luminosity for the outflow of 3.7 kpc, 70 M_{sun} yr^{-1}, and 2.0 x 10^{43} ergs s^{-1}, respectively. Such mass flow rate value can contribute significantly to the metal enrichment of the intra-cluster medium. We find that this moderate velocity outflow is similar to those recently discovered in massive post-starburst galaxies. Finally, we describe the scientific potential of future observations targeting this object.