UVIT view of Centaurus A; a detailed study on positive AGN feedback

Abstract

$\require{mediawiki-texvc}$ Supermassive black holes at the centre of active galactic nuclei (AGN) produce relativistic jets that can affect the star formation characteristics of the AGN hosts. Observations in the ultraviolet (UV) band can provide an excellent view of the effect of AGN jets on star formation. Here, we present a census of star formation properties in the Northern Star-forming Region (NSR) that spans about 20 kpc of the large radio source Centaurus A hosted by the giant elliptical galaxy NGC 5128. In this region, we identified 352 UV sources associated with Cen A using new observations at an angular resolution of $<$1.5 arcseconds observed with the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat. These observations were carried out in one far-ultraviolet (FUV; ${\lambda }_{\text{mean}}$ = 1481 $\mathring{A}$) and three near-ultraviolet (NUV; with ${\lambda }_{\text{mean}}$ of 2196 $\mathring{A}$, 2447 $\mathring{A}$, and 2792 $\mathring{A}$, respectively) bands. The star-forming sources identified in UV tend to lie in the direction of the jet of Cen A, thereby suggesting jet triggering of star formation. Separating the NSR into Outer and Inner regions, we found the stars in the Inner region to have a relatively younger age than the Outer region, suggesting that the two regions may have different star formation histories. We also provide the UVIT source catalogue in the NSR.

Accepted for publication by MNRAS. Data and Jupyter notebooks are available at https://github.com/prajwel/Centaurus-A_NSR . 15 pages, 19 figures, 6 tables

References in corpus (18)

• Array Programming with NumPy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The Effects of Stellar Rotation. II. A Comprehensive Set of Starburst99 Models
• On the frequency, intensity and duration of starburst episodes triggered by galaxy interactions and mergers
• A definitive merger-AGN connection at z~0 with CFIS: mergers have an excess of AGN and AGN hosts are more frequently disturbed
• Minkowski's Object: A Starburst Triggered by a Radio Jet, Revisited
• Interacting galaxies on FIRE-2: The connection between enhanced star formation and interstellar gas content
• Detection of Two Massive CO Systems in 4C 41.17 at z = 3.8
• Filamentary Star Formation in NGC 1275
• Jet-induced star formation in 3C 285 and Minkowski Object
• A Recent Major Merger Tale for the Closest Giant Elliptical Galaxy Centaurus A
• The Complex North Transition Region of Centaurus A: A Galactic Wind
• The jet/wind outflow in Centaurus A: a local laboratory for AGN feedback
• Evidence for Non-Hydrostatic Gas Motions in the Hot ISM of Centaurus A
• MUSE discovers perpendicular arcs in the inner filament of Cen A
• The Complex North Transition Region of Centaurus A: Radio Structure
• The Identification of RR Lyrae and Delta Scuti Stars from Variable GALEX Ultraviolet Sources

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• Cosmic Ray Ionization of Low-Excitation Lines in Active Galactic Nuclei and Starburst Galaxies
• Study of Star-formation in Dual Nuclei Galaxies using UVIT observations
• Modeling Cosmological Evolution of Jetted Seyfert Galaxies for z<10
• Physical conditions in Centaurus A's northern filaments II: Does the HCO${}^{+}$ emission highlight the presence of shocks?