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Euclid: early release observations - deep anatomy of nearby galaxies

Euclid: early release observations - deep anatomy of nearby galaxies
Euclid: early release observations - deep anatomy of nearby galaxies
Euclid is poised to make significant advances in the study of nearby galaxies in the local Universe. Here we present a first look at 6 galaxies observed for the Nearby Galaxy Showcase as part of the Euclid Early Release Observations acquired between August and November, 2023. These targets, 3 dwarf galaxies (HolmbergII, IC10, NGC6822) and 3 spirals (IC342, NGC2403, NGC6744), range in distance from about 0.5 Mpc to 8.8 Mpc. Our assessment of the surface brightness depths in the stacked Euclid images confirms previous estimates in 100 arcsec^2 regions of 1sigma=30.5 mag/arcsec^2 for VIS, but slightly deeper than previous estimates for NISP with 1sigma=29.2-29.4 mag/arcsec^2. By combining Euclid HE, YE, and IE into RGB images, we illustrate the large field-of-view covered by a single Reference Observing Sequence, together with exquisite detail on parsec scales in these nearby galaxies. Radial surface brightness and color profiles demonstrate galaxy colors in agreement with stellar population synthesis models. Standard stellar photometry selection techniques find approximately 1.3 million stars across the 6 galaxy fields. Euclid's resolved stellar photometry allows us to constrain the star-formation histories of these galaxies, by disentangling the distributions of young stars, as well as asymptotic giant branch and red giant branch stellar populations. We finally examine 2 galaxies individually for surrounding satellite systems. Our analysis of the ensemble of dwarf satellites around NGC6744 reveals a new galaxy, EDwC1, a nucleated dwarf spheroidal at the end of a spiral arm. Our new census of the globular clusters around NGC2403 yields 9 new star-cluster candidates, 8 of which with colors indicative of evolved stellar populations. In summary, our investigation of the 6 Showcase galaxies demonstrates that Euclid is a powerful probe of the anatomy of nearby galaxies [abridged].
astro-ph.GA, galaxies: dwarf, galaxies: starburst, galaxies: irregular, galaxies: spiral, galaxies: stellar content
0004-6361
Hunt, L.K.
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Annibali, F.
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Cuillandre, J.-C.
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Ferguson, A.M.N.
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Schirmer, M.
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Stone, C.
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Tortora, C.
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Saifollahi, T.
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Lançon, A.
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Erkal, D.
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Roman, J.
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Auricchio, N.
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Awan, S.
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et al.
Hunt, L.K.
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Annibali, F.
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Cuillandre, J.-C.
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Jablonka, P.
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Schinnerer, E.
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Schirmer, M.
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Stone, C.
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Tortora, C.
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Saifollahi, T.
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Bolzonella, M.
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Gwyn, S.
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Kluge, M.
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Laureijs, R.
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Carollo, D.
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Collins, M.L.M.
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Duc, P.-A.
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Saremi, E.
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Scaramella, R.
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Belokurov, V.
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Conselice, C.J.
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Knapen, J.H.
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McConnachie, A.W.
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McDonald, I.
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Carretero, J. Miro
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Roman, J.
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Aghanim, N.
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Altieri, B.
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Andreon, S.
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Auricchio, N.
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Awan, S.
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Azzollini, R.
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Baldi, M.
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Balestra, A.
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Bardelli, S.
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Basset, A.
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Bender, R.
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Bonino, D.
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Branchini, E.
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Brescia, M.
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Brinchmann, J.
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Hunt, L.K., Annibali, F. and Cuillandre, J.-C. , et al. (2025) Euclid: early release observations - deep anatomy of nearby galaxies. A&A, 697, [A9]. (doi:10.1051/0004-6361/202450781).

Record type: Article

Abstract

Euclid is poised to make significant advances in the study of nearby galaxies in the local Universe. Here we present a first look at 6 galaxies observed for the Nearby Galaxy Showcase as part of the Euclid Early Release Observations acquired between August and November, 2023. These targets, 3 dwarf galaxies (HolmbergII, IC10, NGC6822) and 3 spirals (IC342, NGC2403, NGC6744), range in distance from about 0.5 Mpc to 8.8 Mpc. Our assessment of the surface brightness depths in the stacked Euclid images confirms previous estimates in 100 arcsec^2 regions of 1sigma=30.5 mag/arcsec^2 for VIS, but slightly deeper than previous estimates for NISP with 1sigma=29.2-29.4 mag/arcsec^2. By combining Euclid HE, YE, and IE into RGB images, we illustrate the large field-of-view covered by a single Reference Observing Sequence, together with exquisite detail on parsec scales in these nearby galaxies. Radial surface brightness and color profiles demonstrate galaxy colors in agreement with stellar population synthesis models. Standard stellar photometry selection techniques find approximately 1.3 million stars across the 6 galaxy fields. Euclid's resolved stellar photometry allows us to constrain the star-formation histories of these galaxies, by disentangling the distributions of young stars, as well as asymptotic giant branch and red giant branch stellar populations. We finally examine 2 galaxies individually for surrounding satellite systems. Our analysis of the ensemble of dwarf satellites around NGC6744 reveals a new galaxy, EDwC1, a nucleated dwarf spheroidal at the end of a spiral arm. Our new census of the globular clusters around NGC2403 yields 9 new star-cluster candidates, 8 of which with colors indicative of evolved stellar populations. In summary, our investigation of the 6 Showcase galaxies demonstrates that Euclid is a powerful probe of the anatomy of nearby galaxies [abridged].

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Accepted/In Press date: 25 July 2024
Published date: 30 April 2025
Additional Information: Part of the A&A special issue `Euclid on Sky', which contains Euclid key reference papers and first results from the Euclid Early Release Observations
Keywords: astro-ph.GA, galaxies: dwarf, galaxies: starburst, galaxies: irregular, galaxies: spiral, galaxies: stellar content

Identifiers

Local EPrints ID: 503643
URI: http://eprints.soton.ac.uk/id/eprint/503643
DOI: doi:10.1051/0004-6361/202450781
ISSN: 0004-6361
PURE UUID: 02ba1426-b5dd-46c6-8b70-384b192d26b1

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Date deposited: 07 Aug 2025 16:50
Last modified: 30 Sep 2025 17:21

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Contributors

Author: L.K. Hunt
Author: F. Annibali
Author: J.-C. Cuillandre
Author: A.M.N. Ferguson
Author: P. Jablonka
Author: S.S. Larsen
Author: F. R. Marleau
Author: E. Schinnerer
Author: M. Schirmer
Author: C. Stone
Author: C. Tortora
Author: T. Saifollahi
Author: A. Lançon
Author: M. Bolzonella
Author: S. Gwyn
Author: M. Kluge
Author: R. Laureijs
Author: D. Carollo
Author: M.L.M. Collins
Author: P. Dimauro
Author: P.-A. Duc
Author: D. Erkal
Author: J.M. Howell
Author: C. Nally
Author: E. Saremi
Author: R. Scaramella
Author: V. Belokurov
Author: C.J. Conselice
Author: J.H. Knapen
Author: A.W. McConnachie
Author: I. McDonald
Author: J. Miro Carretero
Author: J. Roman
Author: M. Sauvage
Author: E. Sola
Author: N. Aghanim
Author: B. Altieri
Author: S. Andreon
Author: N. Auricchio
Author: S. Awan
Author: R. Azzollini
Author: M. Baldi
Author: A. Balestra
Author: S. Bardelli
Author: A. Basset
Author: R. Bender
Author: D. Bonino
Author: E. Branchini
Author: M. Brescia
Author: J. Brinchmann
Corporate Author: et al.

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