EMU radio observations of barred spiral galaxy NGC 5938 (Araish)

Hina Zakir; Miroslav D. Filipović; Luke Barnes; Rami Z. E. Alsaberi; Tao An; Kristen Dage; Stefan William Duchesne; Andrew Hopkins; Anna Kapinska; Bärbel Silvia Koribalski; Sanja Lazarević; Denis Leahy; Zhu Liu; Ray Norris; Arne Rau; Zachary Smeaton; Thomas Jarrett

doi:10.1017/pasa.2026.10163

EMU radio observations of barred spiral galaxy NGC 5938 (Araish)

Hina Zakir^*, Miroslav D. Filipović, Luke Barnes, Rami Z. E. Alsaberi, Tao An, Kristen Dage, Stefan William Duchesne, Andrew Hopkins, Anna Kapinska, Bärbel Silvia Koribalski, Sanja Lazarević, Denis Leahy, Zhu Liu, Ray Norris, Arne Rau, Zachary Smeaton, Thomas Jarrett

^*Corresponding author for this work

School of Mathematical and Physical Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

We present multi-wavelength observations of the nearby spiral galaxy NGC5938 (Araish) to investigate the origin of its radio emission, specifically the contribution from active galactic nucleus (AGN) activity and star formation. Using Evolutionary Map of the Universe (EMU) data, we detect extended radio emission extending outwards to the galactic axis, with a steep non-thermal spectral index (α = −1.2 ± 0.2) indicative of synchrotron radiation from an AGN jet. The jet has a physical extent of ≈ 8.2 kpc (angular length of 64″). Multi-wavelength data from The Dark Energy Camera Plane Survey 2 (DECaPS2),Wide-field Infrared Survey Explorer (WISE), and extended Roentgen Survey with an Imaging Telescope Array (eROSITA) provide further support for this interpretation. The colour-colour diagram presenting WISE infrared observations suggests the presence of dust and young stars that trace the galaxy’s disk structure. Our analysis reveals a radio jet, alongside star formation traced by infrared emission, demonstrating the complex interplay of AGN activity and star formation in this well-resolved galaxy. Intriguingly, the spatial relationship reveals the brighter X-ray emission to be largely adjacent to and enveloping the extended radio emission. This suggests that the radio jet, while extending at a significant angle to the galactic disk, is confined by the larger X-ray gas/halo, similar to other systems (i.e., ESO 295–IG022, Centaurus A) and may indicate jet collimation and channelling effects.

Original language	English
Article number	e035
Pages (from-to)	1-11
Number of pages	11
Journal	Publications of the Astronomical Society of Australia
Volume	43
DOIs	https://doi.org/10.1017/pasa.2026.10163
Publication status	Published - 23 Feb 2026

Bibliographical note

© The Author(s), 2026. Published by Cambridge University Press on behalf of Astronomical Society of Australia. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

AGN
ASKAP
EMU
ESO 295–IG022
NGC 1068
NGC 5938
NGC5938
SFMS
Star formation

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Zakir, H., Filipović, M. D., Barnes, L., Alsaberi, R. Z. E., An, T., Dage, K., Duchesne, S. W., Hopkins, A., Kapinska, A., Koribalski, B. S., Lazarević, S., Leahy, D., Liu, Z., Norris, R., Rau, A., Smeaton, Z., & Jarrett, T. (2026). EMU radio observations of barred spiral galaxy NGC 5938 (Araish). Publications of the Astronomical Society of Australia, 43, 1-11. Article e035. https://doi.org/10.1017/pasa.2026.10163

@article{87675df36e2e4334a9ce40c68e35eba5,

title = "EMU radio observations of barred spiral galaxy NGC 5938 (Araish)",

abstract = "We present multi-wavelength observations of the nearby spiral galaxy NGC5938 (Araish) to investigate the origin of its radio emission, specifically the contribution from active galactic nucleus (AGN) activity and star formation. Using Evolutionary Map of the Universe (EMU) data, we detect extended radio emission extending outwards to the galactic axis, with a steep non-thermal spectral index (α = −1.2 ± 0.2) indicative of synchrotron radiation from an AGN jet. The jet has a physical extent of ≈ 8.2 kpc (angular length of 64″). Multi-wavelength data from The Dark Energy Camera Plane Survey 2 (DECaPS2),Wide-field Infrared Survey Explorer (WISE), and extended Roentgen Survey with an Imaging Telescope Array (eROSITA) provide further support for this interpretation. The colour-colour diagram presenting WISE infrared observations suggests the presence of dust and young stars that trace the galaxy{\textquoteright}s disk structure. Our analysis reveals a radio jet, alongside star formation traced by infrared emission, demonstrating the complex interplay of AGN activity and star formation in this well-resolved galaxy. Intriguingly, the spatial relationship reveals the brighter X-ray emission to be largely adjacent to and enveloping the extended radio emission. This suggests that the radio jet, while extending at a significant angle to the galactic disk, is confined by the larger X-ray gas/halo, similar to other systems (i.e., ESO 295–IG022, Centaurus A) and may indicate jet collimation and channelling effects.",

keywords = "AGN, ASKAP, EMU, ESO 295–IG022, NGC 1068, NGC 5938, NGC5938, SFMS, Star formation",

author = "Hina Zakir and Filipovi{\'c}, \{Miroslav D.\} and Luke Barnes and Alsaberi, \{Rami Z. E.\} and Tao An and Kristen Dage and Duchesne, \{Stefan William\} and Andrew Hopkins and Anna Kapinska and Koribalski, \{B{\"a}rbel Silvia\} and Sanja Lazarevi{\'c} and Denis Leahy and Zhu Liu and Ray Norris and Arne Rau and Zachary Smeaton and Thomas Jarrett",

note = "{\textcopyright} The Author(s), 2026. Published by Cambridge University Press on behalf of Astronomical Society of Australia. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2026",

month = feb,

day = "23",

doi = "10.1017/pasa.2026.10163",

language = "English",

volume = "43",

pages = "1--11",

journal = "Publications of the Astronomical Society of Australia",

issn = "1323-3580",

publisher = "Cambridge University Press (CUP)",

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Zakir, H, Filipović, MD, Barnes, L, Alsaberi, RZE, An, T, Dage, K, Duchesne, SW, Hopkins, A, Kapinska, A, Koribalski, BS, Lazarević, S, Leahy, D, Liu, Z, Norris, R, Rau, A, Smeaton, Z & Jarrett, T 2026, 'EMU radio observations of barred spiral galaxy NGC 5938 (Araish)', Publications of the Astronomical Society of Australia, vol. 43, e035, pp. 1-11. https://doi.org/10.1017/pasa.2026.10163

TY - JOUR

T1 - EMU radio observations of barred spiral galaxy NGC 5938 (Araish)

AU - Zakir, Hina

AU - Filipović, Miroslav D.

AU - Barnes, Luke

AU - Alsaberi, Rami Z. E.

AU - An, Tao

AU - Dage, Kristen

AU - Duchesne, Stefan William

AU - Hopkins, Andrew

AU - Kapinska, Anna

AU - Koribalski, Bärbel Silvia

AU - Lazarević, Sanja

AU - Leahy, Denis

AU - Liu, Zhu

AU - Norris, Ray

AU - Rau, Arne

AU - Smeaton, Zachary

AU - Jarrett, Thomas

N1 - © The Author(s), 2026. Published by Cambridge University Press on behalf of Astronomical Society of Australia. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2026/2/23

Y1 - 2026/2/23

N2 - We present multi-wavelength observations of the nearby spiral galaxy NGC5938 (Araish) to investigate the origin of its radio emission, specifically the contribution from active galactic nucleus (AGN) activity and star formation. Using Evolutionary Map of the Universe (EMU) data, we detect extended radio emission extending outwards to the galactic axis, with a steep non-thermal spectral index (α = −1.2 ± 0.2) indicative of synchrotron radiation from an AGN jet. The jet has a physical extent of ≈ 8.2 kpc (angular length of 64″). Multi-wavelength data from The Dark Energy Camera Plane Survey 2 (DECaPS2),Wide-field Infrared Survey Explorer (WISE), and extended Roentgen Survey with an Imaging Telescope Array (eROSITA) provide further support for this interpretation. The colour-colour diagram presenting WISE infrared observations suggests the presence of dust and young stars that trace the galaxy’s disk structure. Our analysis reveals a radio jet, alongside star formation traced by infrared emission, demonstrating the complex interplay of AGN activity and star formation in this well-resolved galaxy. Intriguingly, the spatial relationship reveals the brighter X-ray emission to be largely adjacent to and enveloping the extended radio emission. This suggests that the radio jet, while extending at a significant angle to the galactic disk, is confined by the larger X-ray gas/halo, similar to other systems (i.e., ESO 295–IG022, Centaurus A) and may indicate jet collimation and channelling effects.

AB - We present multi-wavelength observations of the nearby spiral galaxy NGC5938 (Araish) to investigate the origin of its radio emission, specifically the contribution from active galactic nucleus (AGN) activity and star formation. Using Evolutionary Map of the Universe (EMU) data, we detect extended radio emission extending outwards to the galactic axis, with a steep non-thermal spectral index (α = −1.2 ± 0.2) indicative of synchrotron radiation from an AGN jet. The jet has a physical extent of ≈ 8.2 kpc (angular length of 64″). Multi-wavelength data from The Dark Energy Camera Plane Survey 2 (DECaPS2),Wide-field Infrared Survey Explorer (WISE), and extended Roentgen Survey with an Imaging Telescope Array (eROSITA) provide further support for this interpretation. The colour-colour diagram presenting WISE infrared observations suggests the presence of dust and young stars that trace the galaxy’s disk structure. Our analysis reveals a radio jet, alongside star formation traced by infrared emission, demonstrating the complex interplay of AGN activity and star formation in this well-resolved galaxy. Intriguingly, the spatial relationship reveals the brighter X-ray emission to be largely adjacent to and enveloping the extended radio emission. This suggests that the radio jet, while extending at a significant angle to the galactic disk, is confined by the larger X-ray gas/halo, similar to other systems (i.e., ESO 295–IG022, Centaurus A) and may indicate jet collimation and channelling effects.

KW - AGN

KW - ASKAP

KW - EMU

KW - ESO 295–IG022

KW - NGC 1068

KW - NGC 5938

KW - NGC5938

KW - SFMS

KW - Star formation

UR - https://www.scopus.com/pages/publications/105031112144

UR - https://purl.org/au-research/grants/arc/DP200100784

U2 - 10.1017/pasa.2026.10163

DO - 10.1017/pasa.2026.10163

M3 - Article

AN - SCOPUS:105031112144

SN - 1323-3580

VL - 43

SP - 1

EP - 11

JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

M1 - e035

ER -

EMU radio observations of barred spiral galaxy NGC 5938 (Araish)

Abstract

Bibliographical note

Keywords

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