Galaxy And Mass Assembly (GAMA): extended intragroup light in a group at z = 0.2 from deep Hyper Suprime-Cam images
Year: 2022
Type: article
Abstract: ABSTRACT 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 $\mu _{g}^{\rm {lim}}=30.76$ 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 ${\sim} 2\!-\!36 {{\ \rm per\ cent}}$ 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.
Institutions: Australian Research Council, UNSW Sydney, ASTRO-3D, ARC Centre of Excellence for All-sky Astrophysics, Space Telescope Science Institute, Universidad Internacional de La Rioja, Centro de Estudios de Física del Cosmos de Aragón, The University of Western Australia, International Centre for Radio Astronomy Research, University of Louisville, University of Hull
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: Albert Ellis Institute, Ministerio de Ciencia, Innovación y Universidades, European Commission, University of New South Wales, Federación Española de Enfermedades Raras, Ministerio de Ciencia e Innovación, National Astronomical Observatory of Japan, Science and Technology Facilities Council, Australian Research Council, Agencia Estatal de Investigación, Division of Arctic Sciences, NextGenerationEU
Awards: G1105844351, G1540888849, G1855990336, G1951747788, G2262748287, G2309174360, G2344339751, G2601397997, G300979063, G318412399, G3452655474, G3480869486, G3518538256, G3681454997, G3690828678, G4042783231, G4137855093, G425668148, G4287193992, G4295090771, G430777504, ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, G4873164624, G489534662, G490073602, G5080475149, G5421974903, G5555131222, G5635532810, G5648559009, G6520718613, G6728930308, G7741342715, G7805626310, Unveiling the hidden stars of the Universe, G7863371703, G7915199406, G8178315791, G8497050386, G8684520763
OpenAlex ID: W4309818276