The relation between galaxy density and radio jet power for 1.4 GHz VLA selected AGNs in Stripe 82

Kolwa, Sthabile; Jarvis, M. J.; McAlpine, K.; Heywood, Ian

doi:10.1093/mnras/sty3019

Cited by 11 publications

(12 citation statements)

References 83 publications

(97 reference statements)

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“…There is sufficient evidence to suggest that the preferred environments of radio galaxies are rich clusters and groups. This is at low redshifts (z 1) where the most radio-loud sources have a higher likelihood of residing in kpc-scale overdense structures (e.g., Best et al 2007;Karouzos et al 2014;Magliocchetti et al 2018;Kolwa et al 2019). Radio-loud sources are also prevalent in over-dense environments consisting of dusty starburst galaxies and/or Lyα emitters at z > 1.2 (e.g., Hatch et al 2011;Wylezalek et al 2013;Dannerbauer et al 2014;Saito et al 2015).…”

Section: Blueshifted Emission: Companion Galaxy or Outflow?mentioning

confidence: 99%

MUSE unravels the ionisation and origin of metal-enriched absorbers in the gas halo of a z = 2.92 radio galaxy

Kolwa

Vernet

Breuck

et al. 2019

A&A

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We have used the Multi-Unit Spectroscopic Explorer (MUSE) to study the circumgalactic medium (CGM) of a z = 2.92 radio galaxy, MRC 0943-242 by parametrising its emitting and absorbing gas. In both Lyα λ1216 and He ii λ1640 lines, we observe emission with velocity shifts of ∆ −1000 km s −1 from the systemic redshift of the galaxy. These blueshifted components represent kinematically perturbed gas that is aligned with the radio axis, which we interpret as jet-driven outflows. Three of the four known Lyα absorbers are detected at the same velocity as C iv λλ1548, 1551 and N v λλ1239, 1243 absorbers, proving that the gas is metal enriched more so than previously thought. At the velocity of a strong Lyα absorber with an H i column of N H i /cm −2 = 10 19.2 and velocity shift of ∆ −400 km s −1 , we also detect Si ii λ1260 and Si ii λ1527 absorption, which suggests that the absorbing gas is ionisation bounded. With the added sensitivity of this MUSE observation, we are more capable of adding constraints to absorber column densities and consequently determining what powers their ionisation. To do this, we obtain photoionisation grid models in cloudy which show that AGN radiation is capable of ionising the gas and producing the observed column densities in a gas of metallicity of Z/Z 0.01 with a nitrogen abundance a factor of 10 greater than that of hydrogen. This metal-enriched absorbing gas, which is also spatially extended over a projected distance of r 60 kpc, is likely to have undergone chemical enrichment through stellar winds that have swept up metals from the interstellar-medium and deposited them in the outer regions of the galaxy's halo.

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Section: Blueshifted Emission: Companion Galaxy or Outflow?mentioning

confidence: 99%

MUSE unravels the ionisation and origin of metal-enriched absorbers in the gas halo of a z = 2.92 radio galaxy

Kolwa

Vernet

Breuck

et al. 2019

A&A

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“…A lot of literature suggests significant dependence of AGN on environment (e.g. Kauffmann et al 2004;Gilmour et al 2007;Best et al 2007;Silverman et al 2009;von der Linden et al 2010;Bradshaw et al 2011;Hwang et al 2012;Sabater et al 2013;Martini et al 2013;Khabiboulline et al 2014;Ehlert et al 2014;Silverman et al 2015;Coldwell et al 2017;Lopes et al 2017;Gordon et al 2018;Powell et al 2018;Magliocchetti et al 2018;Koulouridis et al 2018;Argudo-Fernández et al 2018;Li et al 2019;Kolwa et al 2019). For instance, Kauffmann et al (2004) find that AGN host galaxies with strong [O III] emission are twice as frequent in low density regions than in high density regions.…”

Section: Introductionmentioning

confidence: 99%

The dependence of AGN activity on environment in SDSS

Man

Peng

Kong

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Environment is one of the key external drivers of the galaxies, while active galactic nucleus (AGN) is one of the key internal drivers. Both of them play fundamental roles in regulating the formation and evolution of galaxies. We explore the interrelationship between environment and AGN in SDSS. At a given stellar mass, the specific star formation rate distribution of the AGN host galaxies remains unchanged with overdensity, with the peak of the distribution around the Green Valley. We show that, at a given stellar mass, the AGN fraction that has been commonly used in previous studies (defined as the number of AGNs relative to all galaxies including passive and star forming ones) does decrease with increasing over-density for satellites. This is largely due to the fact that the fraction of passive galaxies strongly depends on environment. In order to investigate the intrinsic correlation between AGN and environment, especially under the assumption that AGN feedback is responsible for star formation quenching, the AGN fraction should be defined as the number of AGNs relative to the star-forming galaxies only. With the new definition, we find little dependence of AGN fraction on over-density, central/satellite, and group halo mass. There is only marginal evidence that AGN may prefer denser regions, which is possibly due to more frequent interaction of galaxies or higher merger rate in groups. Our results support the scenario that internal secular evolution is the predominant mechanism of triggering AGN activity, while external environment related processes only play a minor role.

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“…25.8 W Hz −1 are strongly clustered (Auger et al 2008;Donoso et al 2010;Mawatari et al 2012;Karouzos et al 2014;Kolwa et al 2019). Deeper radio observations could shed light on the HzRG environments in the fainter radio-regime.…”

Section: The Hzrg Environments As a Function Of Radio Luminositymentioning

confidence: 90%

“…Most of the radio galaxies tend to exist in the overdense regions (e.g., Gendre et al 2013;Ramos Almeida et al 2013;Hatch et al 2014;Karouzos et al 2014;Pace & Salim 2014;Jones et al 2015;Malavasi et al 2015;Croston et al 2018;Magliocchetti et al 2018;Kolwa et al 2019;Massaro et al 2019;Moravec et al 2019;Penney et al 2019;Shen et al 2019). Additionally, the dark matter halo mass of radio galaxies are estimated to be 10 13 M ⊙ (Peacock & Nicholson 1991;Magliocchetti et al 2004;Brand et al 2005;Magliocchetti et al 2017;, implying that radio galaxies could be associated with cluster progenitors.…”

Section: Introductionmentioning

confidence: 99%

A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed by High-z Radio Galaxies at z~4

Uchiyama,

Yamashita,

Toshikawa

et al. 2021

Preprint

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We present the environmental properties around high-z radio galaxies (HzRGs) at z ∼ 4, which have been poorly investigated because of their rarity. We use the largest samples of HzRGs and g-dropout galaxy overdense regions at z ∼ 4, which were constructed from Hyper Suprime-Cam Subaru Strategic Program, to characterize the HzRG environments statistically. We measure the g-dropout galaxy overdensities around 21 HzRGs whose rest-frame 1.4 GHz radio luminosities (L 1.4GHz ) are 10 26−27 W Hz −1 . We find that the overdensities around the faint HzRGs with L 1.4GHz ∼ 10 26.0−26.5 W Hz −1 tend to be higher than that of the g-dropout galaxies. On the other hand, no significant difference of density environments is found between the luminous HzRGs with L 1.4GHz ∼ 10 26.5−27.0 W Hz −1 and the g-dropout galaxies. The HzRGs are found to occupy more massive halos than g-dropout galaxies through a cross-correlation between the HzRGs and g-dropout galaxies. This trend is more pronounced in the faint HzRGs. These results are consistent with a scenario where HzRGs get older and more massive as the radio-luminosity decreases. The HzRGs are expected to trace the progenitors of local cluster halos from their calculated halo mass. In addition, we find that surrounding galaxies tend to distribute along the radio-jet major axis of the HzRGs at angular distances less than 500 physical kpc. Our findings imply the onset of the filamentary structures around the HzRGs at z ∼ 4.

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The relation between galaxy density and radio jet power for 1.4 GHz VLA selected AGNs in Stripe 82

Cited by 11 publications

References 83 publications

MUSE unravels the ionisation and origin of metal-enriched absorbers in the gas halo of a z = 2.92 radio galaxy

MUSE unravels the ionisation and origin of metal-enriched absorbers in the gas halo of a z = 2.92 radio galaxy

The dependence of AGN activity on environment in SDSS

A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed by High-z Radio Galaxies at z~4

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