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Galaxy and Mass Assembly (GAMA): Extended intragroup light in a group at z = 0.2 from deep Hyper Suprime-Cam images

Pimbblet, Kevin A.; Martínez-Lombilla, Cristina; Brough, Sarah; Montes, Mireia; Baena-Gallé, Roberto; Akhlaghi, Mohammad; Infante-Sainz, Raúl; Driver, Simon P.; Holwerda, Benne W.; Robotham, Aaron S.G.


Cristina Martínez-Lombilla

Sarah Brough

Mireia Montes

Roberto Baena-Gallé

Mohammad Akhlaghi

Raúl Infante-Sainz

Simon P. Driver

Benne W. Holwerda

Aaron S.G. Robotham


We present a pilot study to assess the potential of Hyper Suprime-Cam Public Data Release 2 (HSC-PDR2) images for the analysis of extended faint structures within groups of galaxies. We examine the intragroup light (IGL) of the group 400138 (Mdyn = 1.3 ± 0.5 × 1013 M⊙, z ∼0.2) from the Galaxy And Mass Assembly (GAMA) survey using Hyper Suprime-Cam Subaru Strategic Program Public Data Release 2 (HSC-SSP PDR2) images in g, r, and i bands. We present the most extended IGL measurement to date, reaching down to μglim =30.76 mag arcsec-2 (3σ; 10 × 10 arcsec2) at a semimajor axis of 275 kpc. The IGL shows mean colour values of g - i = 0.92, g - r = 0.60, and r - i = 0.32 (±0.01). The IGL stellar populations are younger (2-2.5 Gyr) and less metal rich ([Fe/H] ∼-0.4) than those of the host group galaxies. We find a range of IGL fractions as a function of total group luminosity of ∼ 2-36 per cent depending on the definition of IGL, with larger fractions the bluer the observation wavelength. The early-type to late-type galaxy ratio suggests that 400138 is a more evolved group, dominated by early-type galaxies, and the IGL fraction agrees with that of other similarly evolved groups. These results are consistent with tidal stripping of the outer parts of Milky Way-like galaxies as the main driver of the IGL build-up. This is supported by the detection of substructure in the IGL towards the galaxy member 1660615 suggesting a recent interaction (<1 Gyr ago) of that galaxy with the core of the group.


Pimbblet, K. A., Martínez-Lombilla, C., Brough, S., Montes, M., Baena-Gallé, R., Akhlaghi, M., …Robotham, A. S. (2023). Galaxy and Mass Assembly (GAMA): Extended intragroup light in a group at z = 0.2 from deep Hyper Suprime-Cam images. Monthly notices of the Royal Astronomical Society, 518(1), 1195-1213.

Journal Article Type Article
Acceptance Date Oct 21, 2022
Online Publication Date Nov 24, 2022
Publication Date 2023
Deposit Date Dec 8, 2022
Publicly Available Date Dec 9, 2022
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 518
Issue 1
Pages 1195-1213
Keywords Galaxies: clusters: intracluster medium; Galaxies: groups: general; Galaxies: groups: individual: 400138; Galaxies: haloes; Galaxies: photometry; Galaxies: evolution
Public URL


Accepted manuscript (9 Mb)

Copyright Statement
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly notices of the Royal Astronomical Society following peer review. The version of record Cristina Martínez-Lombilla, Sarah Brough, Mireia Montes, Roberto Baena-Gallé, Mohammad Akhlaghi, Raúl Infante-Sainz, Simon P Driver, Benne W Holwerda, Kevin A Pimbblet, Aaron S G Robotham, Galaxy And Mass Assembly (GAMA): extended intragroup light in a group at z = 0.2 from deep Hyper Suprime-Cam images, Monthly Notices of the Royal Astronomical Society, Volume 518, Issue 1, January 2023, Pages 1195–1213 is available online at:

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