AGN feedback through multiple jet cycles in the Seyfert galaxy NGC 2639

V., Rao, Vaishnav; Kharb, P.; Rubinur, K; Silpa, S.; Roy, Namrata; Sebastian, Biny; Singh, Veeresh; Janhavi, Baghel,; Manna, S.; Ishwara‐Chandra, C. H.

doi:10.1093/mnras/stad1901

Cited by 8 publications

(8 citation statements)

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“…Recent simulations by Mukherjee et al (2018), Tanner & Weaver (2022), and Meenakshi et al (2022) also show how initially collimated jets could produce isotropic effects and impact the gas and star formation properties in the host galaxies. Clearly delineated multiple jet episodes as well as AGN winds could also produce isotropic impacts (Kharb et al 2006;King & Pounds 2015;Rao et al 2023). Based on their morphology, spectral index, and polarization, a couple of sources from our VLA-uGMRT sample show signatures that could potentially indicate the presence of AGN or starburst winds.…”

Section: Looking For Signatures Of Agn Feedback On Galactic Propertiesmentioning

confidence: 90%

Probing the Interplay between Jets, Winds, and Multi-phase Gas in 11 Radio-quiet PG Quasars: A uGMRT-VLA Study

S.,

Kharb,

et al. 2023

ApJ

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We present polarization-sensitive images from the Karl G. Jansky Very Large Array (VLA) at 5 GHz of 11 radio-quiet PG quasars. Based on the radio morphology, spectral index, and polarization properties from the VLA study, coupled with the findings of our previous 685 MHz uGMRT data, we find the presence of low-power jets on subarcsecond and arcsecond scales in nine sources; some show signatures of bent jets. The origin of radio emission remains unclear in the remaining two sources. Of the 11 sources, linear polarization is detected in four of them with fractional polarization ranging between 2% and 21%. In PG 1229+204, the inferred B-field direction is parallel to the local kiloparsec-scale jet direction. The inferred B-fields are transverse to the weak southward extension in PG 0934+013. For PG 0050+124 and PG 0923+129, the relationship between the B-field structure and radio outflow direction remains unclear. Localized or small-scale jet–medium interactions can be inferred across the sample based on the VLA jet kinetic power arguments and polarization data. These may have the potential as a feedback mechanism. We find that the radio properties do not show strong correlations with the star formation, [O iii] and CO quantities published in the literature. The lack of evidence of AGN feedback on the global galaxy properties could be due to the relative timescales of AGN activity and those over which any impact might be taking place.

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Section: Looking For Signatures Of Agn Feedback On Galactic Propertiesmentioning

confidence: 90%

Probing the Interplay between Jets, Winds, and Multi-phase Gas in 11 Radio-quiet PG Quasars: A uGMRT-VLA Study

S.,

Kharb,

et al. 2023

ApJ

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Section: Episodic Agn Activity and Feedback: Ngc 2639mentioning

confidence: 97%

“…The uGMRT 735 MHz observation of NGC 2639 revealed a jet of size ∼9 kpc (white contours in Figure 2A) in the NE-SW direction [102], while the 325 MHz image showed an unresolved structure in the same direction (Rubinur et al, in preparation). Rao et al [102] proposed that the uGMRT detected jet (∼9 kpc) was the fourth episode of AGN activity, as NGC 2639 is known to have hosted three episodes of AGN activity before [105]. These include a (i) 1.5 Kpc jet in the north-south direction (Black contours in Figure 2A); (ii) 360 pc jet in the east-west direction detected at 5 GHz VLA map (Figure 2B); and (iii) the 3pc jet detected with VLBA in the NE-SW direction (Figure 2C).…”

Section: Episodic Agn Activity and Feedback: Ngc 2639mentioning

confidence: 97%

“…This is a Seyfert 2 type galaxy with a LINER (low-ionization nuclear emission-line region) like spectrum at a luminosity distance of 48.2 Mpc (redshift 0.01113) [103]. This galaxy hosts a SMBH of mass M BH = 1.48 × 10 8 M ⊙ [104] with an Eddington ratio 4×10 −4 [102].…”

Section: Episodic Agn Activity and Feedback: Ngc 2639mentioning

confidence: 99%

“…Recently, a sample of Seyfert was observed with GMRT at 325 and 735 MHz to study the same (Rubinur et al in preparation). One of the sample galaxies, NGC 2639, was studied with radio, UV, and CO data by [102].…”

Section: Agn Feedback In Radio-quiet Agnmentioning

confidence: 99%

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AGN Feedback Signatures in UV Emission

Rubinur

2024

Galaxies

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Supermassive black holes (SMBH) are believed to influence galaxy evolution through AGN (active galactic nuclei) feedback. Galaxy mergers are key processes of galaxy formation that lead to AGN activity and star formation. The relative contribution of AGN feedback and mergers to star formation is not yet well understood. In radio-loud objects, AGN outflows are dominated by large jets. However, in radio-quiet objects, outflows are more complex and involve jet, wind, and radiation. In this review, we discuss the signatures of AGN feedback through the alignment of radio and UV emissions. Current research on AGN feedback is discussed, along with a few examples of studies such as the galaxy merger system MRK 212, the radio-quiet AGN NGC 2639, and the radio-loud system Centaurus A. Multi-frequency observations of MRK 212 indicate the presence of dual AGN, as well as feedback-induced star-forming UV clumps. The fourth episode of AGN activity was detected in radio observations of the Seyfert galaxy NGC 2639, which also showed a central cavity of 6 kpc radius in CO and UV maps. This indicates that multi-epoch jets of radio-quiet AGN can blow out cold molecular gas, which can further reduce star formation in the center of the galaxies. Recent UV observations of Cen A have revealed two sets of stellar population in the northern star-forming region, which may have two different origins. Recent studies have shown that there is evidence that both positive and negative feedback can be present in galaxies at different scales and times. High-resolution, multi-band observations of large samples of different types of AGN and their host galaxies are important for understanding the two types of AGN feedback and their effect on the host galaxies. Future instruments like INSIST and UVEX will be able to help achieve some of these goals.

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New filamentary remnant radio emission and duty cycle constraints in the radio galaxy NGC 6086

Candini,

Brienza,

Bonafede

et al. 2023

A&A

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Radio galaxies are a subclass of active galactic nuclei (AGN) in which accretion onto the supermassive black hole releases energy into the environment via relativistic jets. The jets are not constantly active throughout the life of the host galaxy and alternate between active and quiescent phases. Remnant radio galaxies are detected during a quiescent phase and define a class of unique sources that can be used to constrain the AGN duty cycle. We present, for the first time, a spatially resolved radio analysis of the radio galaxy associated with the galaxy NGC 6086 down to 144 MHz and constraints on the spectral age of the diffuse emission to investigate the duty cycle and evolution of the source. We used three new low-frequency, high-sensitivity observations; the first was performed with the Low Frequency Array at 144 MHz and the other two with the upgraded Giant Metrewave Radio Telescope at 400 MHz and 675 MHz, respectively. To these, we add two Very Large Array archival observations at higher frequencies (1400 and 4700 MHz). In the new observations in the frequency range 144–675 MHz, we detect a second pair of larger lobes and three regions within the remnant emission with a filamentary morphology. We analysed the spectral index trend in the inner remnant lobes and see systematically steeper values (αlow∼1.1–1.3) at the lower frequencies compared to the gigahertz frequencies (αhigh∼0.8–0.9). Steeper spectral indices are found in the newly detected outer lobes (up to αouter∼2.1), as expected if they trace a previous phase of activity of the AGN. However, the differences between the spectra of the two outer lobes suggest different dynamical evolutions within the intra-group medium during their expansion and/or different magnetic field values. Using a single-injection radiative model and assuming equipartition conditions, we place constraints on the age of the inner and outer lobes and derive the duty cycle of the source. We estimate that the duration of the two active phases was 45 Myr and 18 Myr and the duration of the two inactive phases was 66 Myr and 33 Myr. This results in a total active time of ton ∼ 39%. The filamentary structures have a steep spectral index (∼1) without any spectral index trend, and only one of them shows a steepening in the spectrum. Their origin is not yet clear, but they may have formed due to the compression of the plasma or due to magnetic field substructures.

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AGN feedback through multiple jet cycles in the Seyfert galaxy NGC 2639

Cited by 8 publications

References 104 publications

Probing the Interplay between Jets, Winds, and Multi-phase Gas in 11 Radio-quiet PG Quasars: A uGMRT-VLA Study

Probing the Interplay between Jets, Winds, and Multi-phase Gas in 11 Radio-quiet PG Quasars: A uGMRT-VLA Study

AGN Feedback Signatures in UV Emission

New filamentary remnant radio emission and duty cycle constraints in the radio galaxy NGC 6086

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