Euclid: Early Release Observations -- Deep anatomy of nearby galaxies

L. K. Hunt (1); F. Annibali (2); J.-C. Cuillandre (3); A. M. N.; Ferguson (4); P. Jablonka (5); S. S. Larsen (6); F. R. Marleau (7); E.; Schinnerer (8); M. Schirmer (8); C. Stone (9); C. Tortora (10); T. Saifollahi; (11; 12); A. Lan\c{c}on (11); M. Bolzonella (2); S. Gwyn (13); M. Kluge; (14); R. Laureijs (15); D. Carollo (16); M. L. M. Collins (17); P. Dimauro; (18; 19); P.-A. Duc (20); D. Erkal (17); J. M. Howell (4); C. Nally (4),; E. Saremi (21); R. Scaramella (18; 22); V. Belokurov (23); C. J. Conselice; (24); J. H. Knapen (25; 26); A. W. McConnachie (13); I. McDonald (24); J.; Miro Carretero (27; 28); J. Roman (26; 25); M. Sauvage (3); E. Sola; (23); N. Aghanim (29); B. Altieri (30); S. Andreon (31); N. Auricchio (2); S.; Awan (32); R. Azzollini (32); M. Baldi (33; 2; 34); A. Balestra (35),; S. Bardelli (2); A. Basset (36); R. Bender (14; 37); D. Bonino (38); E.; Branchini (39; 40; 31); M. Brescia (41; 10; 42); J. Brinchmann; (43; 44); S. Camera (45; 46; 38); G. P. 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Kitching; (32); R. Kohley (30); B. Kubik (53); K. Kuijken (27); M. K\"ummel (37); M.; Kunz (76); H. Kurki-Suonio (77; 78); O. Lahav (79); D. Le Mignant (80); P.; B. Lilje (66); V. Lindholm (77; 78); I. Lloro (81); E. Maiorano (2); O.; Mansutti (16); O. Marggraf (82); K. Markovic (68); N. Martinet (80); F.; Marulli (83; 2; 34); R. Massey (84); S. Maurogordato (85); H. J.; McCracken (73); E. Medinaceli (2); S. Mei (86); Y. Mellier (87; 73); M.; Meneghetti (2; 34); E. Merlin (18); G. Meylan (5); M. Moresco (83; 2),; L. Moscardini (83; 2; 34); E. Munari (16; 88); R. Nakajima (82); R.; C. Nichol (17); S.-M. Niemi (15); J. W. Nightingale (89; 90); C. Padilla; (91); S. Paltani (57); F. Pasian (16); K. Pedersen (92); W. J. Percival (93; and 94; 95); V. Pettorino (15); S. Pires (3); G. Polenta (96); M. Poncet; (36); L. A. Popa (97); L. Pozzetti (2); G. D. Racca (15); F. Raison (14); R.; Rebolo (25; 26); A. Refregier (98); A. Renzi (99; 59); J. Rhodes (68),; G. Riccio (10); E. Romelli (16); M. Roncarelli (2); E. Rossetti (33); R.; Saglia (37; 14); D. Sapone (100); B. Sartoris (37; 16); P. Schneider; (82); T. Schrabback (7); M. Scodeggio (47); A. Secroun (62); G. Seidel (8),; S. Serrano (60; 101; 102); C. Sirignano (99; 59); G. Sirri (34); J.; Skottfelt (103); L. Stanco (59); P. Tallada-Cresp\'i (48; 49); D.; Tavagnacco (16); A. N. Taylor (4); H. I. Teplitz (104); I. Tereno (55 and; 105); R. Toledo-Moreo (106); F. Torradeflot (49; 48); I. Tutusaus (107),; E. A. Valentijn (12); L. Valenziano (2; 108); T. Vassallo (37; 16); G.; Verdoes Kleijn (12); A. Veropalumbo (31; 40; 109); Y. Wang (104); J.; Weller (37; 14); O. R. Williams (110); G. Zamorani (2); E. Zucca (2); C.; Burigana (111; 108); G. De Lucia (16); K. George (37); V. Scottez (87 and; 112); M. Miluzio (30); P. Simon (82); A. Mora (113); J. Mart\'in-Fleitas; (113); D. 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arXiv:2405.13499·astro-ph.GA·April 30, 2025

Euclid: Early Release Observations -- Deep anatomy of nearby galaxies

L. K. Hunt (1), F. Annibali (2), J.-C. Cuillandre (3), A. M. N., Ferguson (4), P. Jablonka (5), S. S. Larsen (6), F. R. Marleau (7), E., Schinnerer (8), M. Schirmer (8), C. Stone (9), C. Tortora (10), T. Saifollahi, (11, 12), A. Lan\c{c}on (11), M. Bolzonella (2), S. Gwyn (13)

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TL;DR

Euclid's early observations provide detailed imaging and stellar analysis of six nearby galaxies, revealing new satellite systems and star clusters, and demonstrating its potential for galaxy anatomy studies.

Contribution

This study presents the first detailed analysis of nearby galaxies using Euclid's early data, including surface brightness depths, stellar populations, and discovery of new satellites and star clusters.

Findings

01

Surface brightness depths confirmed and slightly deeper than previous estimates.

02

Approximately 1.3 million stars identified across six galaxies.

03

Discovery of a new satellite galaxy EDwC1 and 9 new star-cluster candidates.

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.…

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