EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies

U. T. Ahmed; A. M. Hopkins; J. Ware; Y. A. Gordon; M. Bilicki; M. J. I. Brown; M. Cluver; G. Gürkan; Á. R. López-Sánchez; D. A. Leahy; L. Marchetti; S. Phillipps; I. Prandoni; N. Seymour; E. N. Taylor; E. Vardoulaki

doi:10.1017/pasa.2024.2

EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies

U. T. Ahmed, A. M. Hopkins, J. Ware, Y. A. Gordon, M. Bilicki, M. J. I. Brown, M. Cluver, G. Gürkan, Á. R. López-Sánchez, D. A. Leahy, L. Marchetti, S. Phillipps, I. Prandoni, N. Seymour, E. N. Taylor, E. Vardoulaki

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Abstract

We demonstrate the importance of radio selection in probing heavily obscured galaxy populations. We combine Evolutionary Map of the Universe (EMU) Early Science data in the Galaxy and Mass Assembly (GAMA) G23 field with the GAMA data, providing optical photometry and spectral line measurements, together with Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry, providing IR luminosities and colours. We investigate the degree of obscuration in star forming galaxies, based on the Balmer decrement (BD), and explore how this trend varies, over a redshift range of 0<z<0.345. We demonstrate that the radio detected population has on average higher levels of obscuration than the parent optical sample, arising through missing the lowest BD and lowest mass galaxies, which are also the lower star formation rate (SFR) and metallicity systems. We discuss possible explanations for this result, including speculation around whether it might arise from steeper stellar initial mass functions in low mass, low SFR galaxies.

Original language	English
Article number	e021
Pages (from-to)	1-16
Number of pages	16
Journal	Publications of the Astronomical Society of Australia
Volume	41
Early online date	17 Jan 2024
DOIs	https://doi.org/10.1017/pasa.2024.2
Publication status	E-pub ahead of print - 17 Jan 2024

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© 2024 The Author(s). Published by Cambridge University Press on behalf of Astronomical Society of Australia. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
Final published version, 2.98 MBLicence: CC BY

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Ahmed, U. T., Hopkins, A. M., Ware, J., Gordon, Y. A., Bilicki, M., Brown, M. J. I., Cluver, M., Gürkan, G., López-Sánchez, Á. R., Leahy, D. A., Marchetti, L., Phillipps, S., Prandoni, I., Seymour, N., Taylor, E. N., & Vardoulaki, E. (2024). EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies. Publications of the Astronomical Society of Australia, 41, 1-16. Article e021. Advance online publication. https://doi.org/10.1017/pasa.2024.2

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title = "EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies",

abstract = "We demonstrate the importance of radio selection in probing heavily obscured galaxy populations. We combine Evolutionary Map of the Universe (EMU) Early Science data in the Galaxy and Mass Assembly (GAMA) G23 field with the GAMA data, providing optical photometry and spectral line measurements, together with Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry, providing IR luminosities and colours. We investigate the degree of obscuration in star forming galaxies, based on the Balmer decrement (BD), and explore how this trend varies, over a redshift range of 0<z<0.345. We demonstrate that the radio detected population has on average higher levels of obscuration than the parent optical sample, arising through missing the lowest BD and lowest mass galaxies, which are also the lower star formation rate (SFR) and metallicity systems. We discuss possible explanations for this result, including speculation around whether it might arise from steeper stellar initial mass functions in low mass, low SFR galaxies.",

author = "Ahmed, {U. T.} and Hopkins, {A. M.} and J. Ware and Gordon, {Y. A.} and M. Bilicki and Brown, {M. J. I.} and M. Cluver and G. G{\"u}rkan and L{\'o}pez-S{\'a}nchez, {{\'A}. R.} and Leahy, {D. A.} and L. Marchetti and S. Phillipps and I. Prandoni and N. Seymour and Taylor, {E. N.} and E. Vardoulaki",

note = "{\textcopyright} 2024 The Author(s). Published by Cambridge University Press on behalf of Astronomical Society of Australia. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/",

year = "2024",

month = jan,

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doi = "10.1017/pasa.2024.2",

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Ahmed, UT, Hopkins, AM, Ware, J, Gordon, YA, Bilicki, M, Brown, MJI, Cluver, M, Gürkan, G, López-Sánchez, ÁR, Leahy, DA, Marchetti, L, Phillipps, S, Prandoni, I, Seymour, N, Taylor, EN & Vardoulaki, E 2024, 'EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies', Publications of the Astronomical Society of Australia, vol. 41, e021, pp. 1-16. https://doi.org/10.1017/pasa.2024.2

TY - JOUR

T1 - EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies

AU - Ahmed, U. T.

AU - Hopkins, A. M.

AU - Ware, J.

AU - Gordon, Y. A.

AU - Bilicki, M.

AU - Brown, M. J. I.

AU - Cluver, M.

AU - Gürkan, G.

AU - López-Sánchez, Á. R.

AU - Leahy, D. A.

AU - Marchetti, L.

AU - Phillipps, S.

AU - Prandoni, I.

AU - Seymour, N.

AU - Taylor, E. N.

AU - Vardoulaki, E.

N1 - © 2024 The Author(s). Published by Cambridge University Press on behalf of Astronomical Society of Australia. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/

PY - 2024/1/17

Y1 - 2024/1/17

N2 - We demonstrate the importance of radio selection in probing heavily obscured galaxy populations. We combine Evolutionary Map of the Universe (EMU) Early Science data in the Galaxy and Mass Assembly (GAMA) G23 field with the GAMA data, providing optical photometry and spectral line measurements, together with Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry, providing IR luminosities and colours. We investigate the degree of obscuration in star forming galaxies, based on the Balmer decrement (BD), and explore how this trend varies, over a redshift range of 0<z<0.345. We demonstrate that the radio detected population has on average higher levels of obscuration than the parent optical sample, arising through missing the lowest BD and lowest mass galaxies, which are also the lower star formation rate (SFR) and metallicity systems. We discuss possible explanations for this result, including speculation around whether it might arise from steeper stellar initial mass functions in low mass, low SFR galaxies.

AB - We demonstrate the importance of radio selection in probing heavily obscured galaxy populations. We combine Evolutionary Map of the Universe (EMU) Early Science data in the Galaxy and Mass Assembly (GAMA) G23 field with the GAMA data, providing optical photometry and spectral line measurements, together with Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry, providing IR luminosities and colours. We investigate the degree of obscuration in star forming galaxies, based on the Balmer decrement (BD), and explore how this trend varies, over a redshift range of 0<z<0.345. We demonstrate that the radio detected population has on average higher levels of obscuration than the parent optical sample, arising through missing the lowest BD and lowest mass galaxies, which are also the lower star formation rate (SFR) and metallicity systems. We discuss possible explanations for this result, including speculation around whether it might arise from steeper stellar initial mass functions in low mass, low SFR galaxies.

U2 - 10.1017/pasa.2024.2

DO - 10.1017/pasa.2024.2

M3 - Article

SN - 1323-3580

VL - 41

SP - 1

EP - 16

JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

M1 - e021

ER -

EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies

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