Toggle Main Menu Toggle Search

Open Access padlockePrints

KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z ≈ 1.4-2.6

Lookup NU author(s): Dr Christopher HarrisonORCiD, Dr David Rosario


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


© 2020 The Author(s). As part of our KMOS AGN Survey at High-redshift (KASHz), we present spatially resolved VLT/KMOS and VLT/SINFONI spectroscopic data and ALMA 870 μm continuum imaging of eight z = 1.4-2.6 moderate AGN (L2-10 kev = 1042-1045 ergs s-1).We map [OIII], Hα and rest-frame FIR emission to search for any spatial anticorrelation between ionised outflows (traced by the [O III] line) and star formation (SF; traced by Hα and FIR), that has previously been claimed for some high-z AGN and used as evidence for negative and/or positive AGN feedback. First, we conclude that Hα is unreliable to map SF inside our AGN host galaxies based on: (i) SF rates inferred from attenuation-corrected Hα can lie below those inferred from FIR; (ii) the FIR continuum is more compact than the Hα emission by a factor of ≈2 on average; (iii) in half of our sample, we observe significant spatial offsets between the FIR and Hα emission, with an average offset of 1.4 ± 0.6 kpc. Secondly, for the five targets with outflows we find no evidence for a spatial anticorrelation between outflows and SF using either Hα or FIR as a tracer. This holds for our re-analysis of a famous z = 1.6 X-ray AGN ('XID 2028') where positive and negative feedback has been previously claimed. Based on our results, any impact on SF by ionised outflows must be subtle, either occurring on scales below our resolution, or on long time-scales.

Publication metadata

Author(s): Scholtz J, Harrison CM, Rosario DJ, Alexander DM, Chen C-C, Kakkad D, Mainieri V, Tiley AL, Turner O, Cirasuolo M, Sharples RM, Stach S

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2020

Volume: 492

Issue: 3

Pages: 3194-3216

Print publication date: 01/03/2020

Online publication date: 10/01/2020

Acceptance date: 19/12/2019

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Oxford University Press


DOI: 10.1093/mnras/staa030


Altmetrics provided by Altmetric