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

Author:

Rao Vaishnav V1ORCID,Kharb P2ORCID,Rubinur K3ORCID,Silpa S2,Roy N4ORCID,Sebastian B5,Singh V6,Baghel J2,Manna S2,Ishwara-Chandra C H2

Affiliation:

1. Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India

2. National Centre for Radio Astrophysics (NCRA) – Tata Institute of Fundamental Research (TIFR), S. P. Pune University Campus , Ganeshkhind, Pune 411007 , India

3. Institute of Theoretical Astrophysics, University of Oslo , P.O. box 1029 Blindern, 0315 OSLO , Norway

4. Johns Hopkins University, Department of Physics & Astronomy , 3400 N. Charles Street, Baltimore, MD 21218 , USA

5. Department of Physics and Astronomy, University of Manitoba , Winnipeg, MB R3T 2N2 , Canada

6. Astronomy and Astrophysics Division, Physical Research Laboratory , Ahmedabad 380009 , India

Abstract

ABSTRACT The Seyfert galaxy NGC 2639 was known to exhibit three episodes of active galactic nuclei (AGN) jet/lobe activity. We present here the upgraded Giant Metrewave Radio Telescope (uGMRT) 735 MHz image of NGC 2639 showing a fourth episode as witnessed by the discovery of ∼9 kpc radio lobes misaligned with the previously known ∼1.5 kpc, ∼360 pc, and ∼3 pc jet features detected through the Karl G. Jansky Very Large Array (VLA) and the Very Long Baseline Array (VLBA), respectively. Using the spectral ageing software brats, we derive the ages of the ∼9 kpc, ∼1.5 kpc, and ∼360 pc episodes to be, respectively, $34^{+4}_{-6}$, $11.8^{+1.7}_{-1.4}$, and $2.8^{+0.7}_{-0.5}$ Myr, and conclude that minor mergers occurred 9−22 Myr apart. NGC 2639 shows a deficit of molecular gas in its central ∼6 kpc region. The GALEX NUV image also shows a deficiency of recent star formation in the same region, while the star formation rate surface density in NGC 2639 is lower by a factor of 5−18 compared to the global Schmidt law of star-forming galaxies. This makes NGC 2639 a rare case of a Seyfert galaxy showing episodic jet activity and possible signatures of jet-driven AGN feedback.

Funder

Department of Atomic Energy, Government of India

National Science Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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