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

Article

Ahmed, U. T., Hopkins, A. M., Ware, J., Gordon, Y. A., Bilicki, M., Brown, M. J. I., Cluver, M., Gürkan, G., Lopez-Sanchez, A. R., Leahy, D. A., Marchetti, L., Phillipps, S., Prandoni, I., Seymour, N., Taylor, E. N. and Vardoulaki, E.. 2024. "EMU/GAMA: Radio detected galaxies are more obscured than optically selected galaxies." Publications of the Astronomical Society of Australia. 41. https://doi.org/10.1017/pasa.2024.2
Article Title

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

ERA Journal ID40237
Article CategoryArticle
AuthorsAhmed, U. T., Hopkins, A. M., Ware, J., Gordon, Y. A., Bilicki, M., Brown, M. J. I., Cluver, M., Gürkan, G., Lopez-Sanchez, A. R., Leahy, D. A., Marchetti, L., Phillipps, S., Prandoni, I., Seymour, N., Taylor, E. N. and Vardoulaki, E.
Journal TitlePublications of the Astronomical Society of Australia
Journal Citation41
Article Numbere021
Number of Pages16
Year2024
PublisherCambridge University Press
ISSN1323-3580
1448-6083
Digital Object Identifier (DOI)https://doi.org/10.1017/pasa.2024.2
Web Address (URL)https://www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/emugama-radiodetected-galaxies-are-more-obscured-than-optically-selected-galaxies/3655E847357870829058BFA20D377CCD
AbstractWe 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.\
KeywordsDust
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20205199. Other physical sciences
Byline AffiliationsCentre for Astrophysics
Macquarie University
University of Wisconsin-Madison, United States
Polish Academy of Sciences, Poland
Monash University
Swinburne University of Technology
Karl Schwarzschild Observatory, Germany
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia
University of Calgary, Canada
University of Cape Town, South Africa
INAF Institute for Radioastronomy, Italy
University of Bristol, United Kingdom
Curtin University
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