Quasars at intermediate redshift are not special; but they are often satellites

Alam, Shadab; Ross, Nicholas P.; Eftekharzadeh, Sarah; Peacock, J. A.; Comparat, Johan; Myers, Adam D.; Ross, Ashley J.

doi:10.1093/mnras/stab898

Cited by 8 publications

(6 citation statements)

References 105 publications

(149 reference statements)

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“…We find that there is no evidence of any significant difference between the neighbors of AGN host galaxies and those of the mass-and redshift-matched sample of inactive galaxies, in terms of morphology, current SFRs, SFH indicators, and age. This suggests that AGN host galaxies will also have very similar properties to those of inactive galaxies (in agreement with studies quasar host at intermediate redshifts by Alam et al 2021); similarly that the AGN activity also has little influence on the properties of its neighbors, although this may occur in environments where the intergalactic medium is denser (Dressler 1980). Figure 9 shows this particularly well, where we find that the sSFR of the neighbors of the AGN hosts does not depend on distance from the galaxy and follows the same distribution as for neighbors of inactive galaxies.…”

Section: Discussionsupporting

confidence: 85%

Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors

Stone

Wethers

Propris

et al. 2023

ApJ

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We explore the properties of galaxies in the proximity (within a ∼2 Mpc radius sphere) of Type I quasars at 0.1 <z <0.35, to check whether and how an active galaxy influences the properties of its neighbors. We further compare these with the properties of neighbors around inactive galaxies of the same mass and redshift within the same volume of space, using the Galaxy and Mass Assembly spectroscopic survey. Our observations reveal no significant difference in properties such as the number of neighbors, morphologies, stellar mass, star formation rates, and star formation history between the neighbors of quasars and those of the comparison sample. This implies that quasar activity in a host galaxy does not significantly affect its neighbors (e.g., via interactions with the jets). Our results suggest that quasar host galaxies do not strongly differ from the average galaxy within the specified mass and redshift range. Additionally, the implication of the relatively minor importance of the environmental effect on and from quasars is that nuclear activity is more likely triggered by internal and secular processes.

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Section: Discussionsupporting

confidence: 85%

Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors

Stone

Wethers

Propris

et al. 2023

ApJ

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“…This is our first main finding -while majority of radio galaxies are the central galaxies in their respective halos consistent with previous results, 20% of radio galaxies in S are in satellite galaxies. This fraction is consistent with recent observations suggesting a nontrivial minority of bright AGN are hosted by satellites (Alam et al 2021;Aird & Coil 2021).…”

Section: Satellite Fractionssupporting

confidence: 92%

The environments of the radio galaxy population in SIMBA

Thomas,

Davé

2021

Preprint

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We investigate the environmental properties of the radio galaxy population using the S cosmological hydrodynamic simulation. We identify centrals and satellites from a population of high and low excitation radio galaxies (HERGs and LERGs) in S, and study their global properties. We find that ∼20% of radio galaxies are satellites and that there are insignificant differences in the global properties of LERGs based on its central/satellite classification. Satellite HERGs display lower values of star formation, 1.4GHz radio luminosity, and Eddington fraction. We further investigate the environments of radio galaxies and sho that HERGs typically live in underdense environments, similar to star-forming galaxies. The environments of high-mass LERGs are similar to non-radio galaxies, but low-mass LERGs live in underdense environments similar to HERGs. At all black hole masses, LERGs live in environments similar to that of quenched and normal galaxies while HERGs live in environments similar to that of star-forming galaxies. The richness of a LERG's environment decreases with increasing Eddington fraction, and the environments of all radio galaxies do not depend on radio luminosity for P 1.4GHz < 10 24 W Hz −1 . Complementing these results, we find that LERGs cluster on the same scale as the total galaxy population while HERGs are unlikely to be found within the same dark matter halo. Finally, we show that there is no environmental preference for radio galaxies at z=2. S predicts that with more sensitive surveys, we will find populations of radio galaxies in environments much similar to the total galaxy population.

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“…This is our first main finding -while majority of radio galaxies are the central galaxies in their respective haloes as canonically believed, 20 per cent of radio galaxies in SIMBA are in satellite galaxies. This fraction is consistent with recent observations suggesting a non-trivial minority of bright AGNs are hosted by satellites (Aird & Coil 2021 ;Alam et al 2021 ). It is worth noting that a large fraction of these satellites have stellar masses comparable to that of their corresponding central, with only 162/278 satellites having masses less that half times the mass of their central and only 77/278 with less than 0.25 times the mass of the central.…”

Section: Satellite Fractionssupporting

confidence: 90%

The environments of the radio galaxy population in simba

Thomas

Davé

2022

Monthly Notices of the Royal Astronomical Society

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We investigate the environmental properties of the z = 0 radio galaxy population using the Simba cosmological hydrodynamic simulation. We identify centrals and satellites from a population of high and low excitation radio galaxies (HERGs and LERGs) in Simba, and study their global properties. We find that $\sim 20{{\%}}$ of radio galaxies are satellites, and that there are insignificant differences in the global properties of LERGs based on their central/satellite classification. HERG satellites display lower values of star formation, 1.4 GHz radio luminosity, and Eddington fractions than HERG centrals. We further investigate the environments of radio galaxies and show that HERGs typically live in less dense environments, similar to star-forming galaxies. The environments of high-mass LERGs are similar to non-radio galaxies, but low-mass LERGs live in underdense environments similar to HERGs. LERGs with over-massive black holes reside in the most dense environments, while HERGs with over-massive black holes reside in underdense environments. The richness of a LERG’s environment decreases with increasing Eddington fraction, and the environments of all radio galaxies do not depend on radio luminosity for $\, P_{\rm 1.4~GHz}< 10^{24} \rm {~W~Hz}^{-1}$. Complementing these results, we find that LERGs cluster on the same scale as the total galaxy population, while multiple HERGs are not found within the same dark matter halo. Finally, we show that high density environments support the growth of HERGs rather than LERGs at z = 2. Simba predicts that with more sensitive surveys, we will find populations of radio galaxies in environments much similar to the total galaxy population.

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Quasars at intermediate redshift are not special; but they are often satellites

Cited by 8 publications

References 105 publications

Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors

Galaxy and Mass Assembly (GAMA): Low-redshift Quasars and Inactive Galaxies Have Similar Neighbors

The environments of the radio galaxy population in SIMBA

The environments of the radio galaxy population in simba

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