TY - JOUR
T1 - Exploring AGN and star formation activity of massive galaxies at cosmic noon
AU - Florez, Jonathan
AU - Jogee, Shardha
AU - Sherman, Sydney
AU - Stevan, Matthew L.
AU - Finkelstei, Steven L.
AU - Papovich, Casey
AU - Kawinwanichakij, Lalitwadee
AU - Ciardullo, Robin
AU - Gronwall, Caryl
AU - Urry, C. Megan
AU - Kirkpatrick, Allison
AU - LaMass, Stephanie M.
AU - Ananna, Tonima Tasnim
AU - Wold, Isak
N1 - Publisher Copyright:
© 2019 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.
PY - 2020
Y1 - 2020
N2 - We investigate the relation between active galactic nucleus (AGN) and star formation (SF) activity at 0.5 < z <3 by analysing 898 galaxies with X-ray luminous AGNs (LX > 1044 erg s-1) and a large comparison sample of ~320 000 galaxies without X-ray luminous AGNs. Our samples are selected from a large (11.8 deg2) area in Stripe 82 that has multiwavelength (X-ray to far-IR) data. The enormous comoving volume (~0.3 Gpc3) at 0.5 < z < 3 minimizes the effects of cosmic variance and captures a large number of massive galaxies (~30 000 galaxies with Mz.ast;> 1011M⊙) and X-ray luminous AGNs. While many galaxy studies discard AGN hosts, we fit the SED of galaxies with and without X-ray luminous AGNs with Code Investigating GALaxy Emission and include AGN emission templates. We find that without this inclusion, stellar masses and star formation rates (SFRs) in AGN host galaxies can be overestimated, on average, by factors of up to ~5 and ~10, respectively. The average SFR of galaxies with X-ray luminous AGNs is higher by a factor of ~3-10 compared to galaxies without X-ray luminous AGNs at fixed stellar mass and redshift, suggesting that high SFRs and high AGN X-ray luminosities may be fuelled by common mechanisms. The vast majority (> 95 per cent) of galaxies with X-ray luminous AGNs at z = 0.5-3 do not show quenched SF: this suggests that if AGN feedback quenches SF, the associated quenching process takes a significant time to act and the quenched phase sets in after the highly luminous phases of AGN activity.
AB - We investigate the relation between active galactic nucleus (AGN) and star formation (SF) activity at 0.5 < z <3 by analysing 898 galaxies with X-ray luminous AGNs (LX > 1044 erg s-1) and a large comparison sample of ~320 000 galaxies without X-ray luminous AGNs. Our samples are selected from a large (11.8 deg2) area in Stripe 82 that has multiwavelength (X-ray to far-IR) data. The enormous comoving volume (~0.3 Gpc3) at 0.5 < z < 3 minimizes the effects of cosmic variance and captures a large number of massive galaxies (~30 000 galaxies with Mz.ast;> 1011M⊙) and X-ray luminous AGNs. While many galaxy studies discard AGN hosts, we fit the SED of galaxies with and without X-ray luminous AGNs with Code Investigating GALaxy Emission and include AGN emission templates. We find that without this inclusion, stellar masses and star formation rates (SFRs) in AGN host galaxies can be overestimated, on average, by factors of up to ~5 and ~10, respectively. The average SFR of galaxies with X-ray luminous AGNs is higher by a factor of ~3-10 compared to galaxies without X-ray luminous AGNs at fixed stellar mass and redshift, suggesting that high SFRs and high AGN X-ray luminosities may be fuelled by common mechanisms. The vast majority (> 95 per cent) of galaxies with X-ray luminous AGNs at z = 0.5-3 do not show quenched SF: this suggests that if AGN feedback quenches SF, the associated quenching process takes a significant time to act and the quenched phase sets in after the highly luminous phases of AGN activity.
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U2 - 10.1093/mnras/staa2200
DO - 10.1093/mnras/staa2200
M3 - Article
AN - SCOPUS:85092932276
SN - 0035-8711
VL - 497
SP - 3273
EP - 3296
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -