<i>Euclid</i>: 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 six galaxies observed for the Nearby Galaxy Showcase as part of the Euclid Early Release Observations acquired between August and November, 2023. These targets, three dwarf galaxies (Holmberg II, IC 10, and NGC 6822) and three spirals (IC 342, NGC 2403, and NGC 6744), range in distance from about 0.5 Mpc to 8.8 Mpc. We first assess the surface brightness depths in the stacked Euclid images, and confirm previous estimates in 100 arcsec 2 regions for Visible Camera (VIS) of 1σ limits of 30.5 mag arcsec -2 , but find deeper than previous estimates for Near-Infrared Spectrometer and Photometer (NISP) with 1σ = 29.2-29.4mag arcsec -2 . By combining Euclid H E , Y E , and I E into RGB images, we illustrate the large field of view (FoV) covered by a single reference observing sequence (ROS), together with exquisite detail on scales of <1-4 parsecs in these nearby galaxies. Our analysis of radial surface brightness and color profiles demonstrates that the photometric calibration of Euclid is consistent with what is expected for galaxy colors according to stellar synthesis models. We perform standard source-selection techniques for stellar photometry, and find approximately 1.3 million stars across the six galaxy fields. After subtracting foreground stars and background galaxies, and applying a color and magnitude selection, we extract stellar populations of different ages for the six galaxies. The resolved stellar photometry obtained with Euclid allows us to constrain the star-formation histories of these galaxies, which we do by disentangling the distributions of young stars and asymptotic giant branch and red giant branch stellar populations. We finally examine two galaxies individually for surrounding systems of dwarf galaxy satellites and globular cluster populations. Our analysis of the ensemble of dwarf satellites around NGC 6744 recovers all the previously known dwarf satellites within the Euclid FoV, and also confirms the satellite nature of a previously identified candidate, dw1909m6341, a nucleated dwarf spheroidal at the end of a spiral arm. Our new census of the globular clusters around NGC 2403 yields nine new star-cluster candidates, eight of which exhibit colors indicative of evolved stellar populations. In summary, our first investigation of six “showcase” galaxies demonstrates that Euclid is a powerful probe of stellar structure and stellar populations in nearby galaxies, and will provide vastly improved statistics on dwarf satellite systems and extragalactic globular clusters in the local Universe, among many other exciting results.
Authors
- G. Seidel (ORCID: https://orcid.org/0000-0003-2907-353X)
- J. Brinchmann (ORCID: https://orcid.org/0000-0003-4359-8797)
- S. S. Larsen (ORCID: https://orcid.org/0000-0003-0069-1203)
- R. P. Saglia
- P. Tallada-Crespí (ORCID: https://orcid.org/0000-0002-1336-8328)
- A Balestra
- O. Lahav (ORCID: https://orcid.org/0000-0002-1134-9035)
- G. Riccio (ORCID: https://orcid.org/0000-0001-7020-1172)
- L. Conversi
- D. Le Mignant (ORCID: https://orcid.org/0000-0002-5339-5515)
- C. Sirignano
- M. Brescia (ORCID: https://orcid.org/0000-0001-9506-5680)
- E. Merlin (ORCID: https://orcid.org/0000-0001-6870-8900)
- I. Hook (ORCID: https://orcid.org/0000-0002-2960-978X)
- M. Kunz
- M. Bolzonella (ORCID: https://orcid.org/0000-0003-3278-4607)
- M. Schirmer (ORCID: https://orcid.org/0000-0003-2568-9994)
- F. Marulli (ORCID: https://orcid.org/0000-0002-8850-0303)
- D. Scott (ORCID: https://orcid.org/0000-0002-6878-9840)
- C. Giocoli (ORCID: https://orcid.org/0000-0002-9590-7961)
- O. Marggraf (ORCID: https://orcid.org/0000-0001-7242-3852)
- Paola Dimauro (ORCID: https://orcid.org/0000-0001-7399-2854)
- F. Courbin (ORCID: https://orcid.org/0000-0003-0758-6510)
- Y. Copin
- S. Paltani
- A. Kiessling (ORCID: https://orcid.org/0000-0002-2590-1273)
- Santiago Casas (ORCID: https://orcid.org/0000-0002-4751-5138)
- A. Grazian (ORCID: https://orcid.org/0000-0002-5688-0663)
- F. Torradeflot (ORCID: https://orcid.org/0000-0003-1160-1517)
- G. Sirri (ORCID: https://orcid.org/0000-0003-2626-2853)
- S. Mei (ORCID: https://orcid.org/0000-0002-2849-559X)
- S. Bardelli (ORCID: https://orcid.org/0000-0002-8900-0298)
- E. Munari (ORCID: https://orcid.org/0000-0002-1751-5946)
- Alberto Basset (ORCID: https://orcid.org/0000-0002-3603-9316)
- Javier Román (ORCID: https://orcid.org/0000-0002-3849-3467)
- R. Azzollini (ORCID: https://orcid.org/0000-0002-0438-0886)
- V. Capobianco
- L. Moscardini (ORCID: https://orcid.org/0000-0002-3473-6716)
- Alexandre Réfrégier (ORCID: https://orcid.org/0000-0003-3416-9317)
- S.-M Niemi
- T. Schrabback (ORCID: https://orcid.org/0000-0002-6987-7834)
- M Miluzio
- S. Farrens (ORCID: https://orcid.org/0000-0002-9594-9387)
- Stephen Gwyn (ORCID: https://orcid.org/0000-0001-8221-8406)
- T. Saifollahi (ORCID: https://orcid.org/0000-0002-9554-7660)
- P Gómez-Álvarez
- Pierre–Alain Duc (ORCID: https://orcid.org/0000-0003-3343-6284)
- S. Andreon (ORCID: https://orcid.org/0000-0002-2041-8784)
- S. Pires (ORCID: https://orcid.org/0000-0002-0249-2104)
- R. Massey (ORCID: https://orcid.org/0000-0002-6085-3780)
- T. Vassallo
- R. Scaramella (ORCID: https://orcid.org/0000-0003-2229-193X)
- D. Tavagnacco (ORCID: https://orcid.org/0000-0001-7475-9894)
- R. Toledo-Moreo
- M. Moresco
- J. Skottfelt (ORCID: https://orcid.org/0000-0003-1310-8283)
- D. Sapone (ORCID: https://orcid.org/0000-0001-7089-4503)
- Elisabeth Sola
- M. Meneghetti (ORCID: https://orcid.org/0000-0003-1225-7084)
- D. Bonino (ORCID: https://orcid.org/0000-0002-3336-9977)
- A. Veropalumbo (ORCID: https://orcid.org/0000-0003-2387-1194)
- M. Poncet
- G. Congedo (ORCID: https://orcid.org/0000-0003-2508-0046)
- L. Valenziano (ORCID: https://orcid.org/0000-0002-1170-0104)
- L.K Hunt
- E. Romelli (ORCID: https://orcid.org/0000-0003-3069-9222)
- C. Burigana (ORCID: https://orcid.org/0000-0002-3005-5796)
- Christopher J. Conselice (ORCID: https://orcid.org/0000-0003-1949-7638)
- Henk Hoekstra (ORCID: https://orcid.org/0000-0002-0641-3231)
- I. Tutusaus (ORCID: https://orcid.org/0000-0002-3199-0399)
- H. Degaudenzi (ORCID: https://orcid.org/0000-0002-5887-6799)
- O. Mansutti
- G. Zamorani (ORCID: https://orcid.org/0000-0002-2318-301X)
- N. Martinet (ORCID: https://orcid.org/0000-0003-2786-7790)
- M.S. Awan (ORCID: https://orcid.org/0000-0001-8323-7350)
- W. Gillard (ORCID: https://orcid.org/0000-0003-4744-9748)
- C. Padilla Aranda (ORCID: https://orcid.org/0000-0001-7951-0166)
- E. Maiorano (ORCID: https://orcid.org/0000-0003-2593-4355)
- Denis Erkal
- B. Gillis (ORCID: https://orcid.org/0000-0002-4478-1270)
- Eva Schinnerer (ORCID: https://orcid.org/0000-0002-3933-7677)
- M. Roncarelli (ORCID: https://orcid.org/0000-0001-9587-7822)
- F. Dubath (ORCID: https://orcid.org/0000-0002-6533-2810)
- Conor Nally (ORCID: https://orcid.org/0000-0002-7512-1662)
- A. Hornstrup (ORCID: https://orcid.org/0000-0002-3363-0936)
- E. Medinaceli (ORCID: https://orcid.org/0000-0002-4040-7783)
- T. Kitching
- A. Lançon (ORCID: https://orcid.org/0000-0002-7214-8296)
- D. Carollo (ORCID: https://orcid.org/0000-0002-0005-5787)
- K. Jahnkę (ORCID: https://orcid.org/0000-0003-3804-2137)
- A. M. N. Ferguson (ORCID: https://orcid.org/0000-0001-7934-1278)
- B. Altieri (ORCID: https://orcid.org/0000-0003-3936-0284)
- A. Secroun
- M. Farina (ORCID: https://orcid.org/0000-0002-3089-7846)
- R. Laureijs
- R. Bender (ORCID: https://orcid.org/0000-0001-7179-0626)
- F. Pasian (ORCID: https://orcid.org/0000-0002-4869-3227)
- L. Guzzo
- J. Weller (ORCID: https://orcid.org/0000-0002-8282-2010)
- M. Castellano (ORCID: https://orcid.org/0000-0001-9875-8263)
- F. Grupp (ORCID: https://orcid.org/0000-0001-7300-9303)
- P. Fosalba (ORCID: https://orcid.org/0000-0002-1510-5214)
- S. Galeotta
- F. Raison (ORCID: https://orcid.org/0000-0002-7819-6918)
- E. Franceschi
- Marco Baldi (ORCID: https://orcid.org/0000-0003-4145-1943)
- J Martín-Fleitas (ORCID: https://orcid.org/0000-0002-8594-569X)
- Konrad H. Kuijken (ORCID: https://orcid.org/0000-0002-3827-0175)
- Michelle Collins (ORCID: https://orcid.org/0000-0002-1693-3265)
- S. Dusini (ORCID: https://orcid.org/0000-0002-1128-0664)
- Elham Saremi (ORCID: https://orcid.org/0000-0002-5075-1764)
- K. Markovič
- B. Garilli (ORCID: https://orcid.org/0000-0001-7455-8750)
- S. Camera (ORCID: https://orcid.org/0000-0003-3399-3574)
- Vasily Belokurov (ORCID: https://orcid.org/0000-0002-0038-9584)
- M. Kilbinger (ORCID: https://orcid.org/0000-0001-9513-7138)
- J. Dinis (ORCID: https://orcid.org/0000-0001-5075-1601)
- V. Lindholm
- Jason Rhodes (ORCID: https://orcid.org/0000-0002-4485-8549)
- M. Sauvage (ORCID: https://orcid.org/0000-0002-0809-2574)
- R. Rébolo (ORCID: https://orcid.org/0000-0003-3767-7085)
- M. Cropper (ORCID: https://orcid.org/0000-0003-4571-9468)
- E. Keihänen (ORCID: https://orcid.org/0000-0003-1804-7715)
- B. Sartoris
- Koshy George (ORCID: https://orcid.org/0000-0002-1734-8455)
- S. Cavuoti (ORCID: https://orcid.org/0000-0002-3787-4196)
- N. Auricchio (ORCID: https://orcid.org/0000-0003-4444-8651)
- M. Frailis (ORCID: https://orcid.org/0000-0002-7400-2135)
- Jean‐Charles Cuillandre (ORCID: https://orcid.org/0000-0002-3263-8645)
- V Scottez (ORCID: https://orcid.org/0009-0008-3864-940X)
- M. Fumana
- A.W Mcconnachie
- P. Šimon (ORCID: https://orcid.org/0000-0001-9106-9975)
- C. Carbone
- F. Annibali (ORCID: https://orcid.org/0000-0003-3758-4516)
- Christopher Stone (ORCID: https://orcid.org/0000-0002-7842-8029)
- S. Kermiche
- L. Corcione (ORCID: https://orcid.org/0000-0002-6497-5881)
- G. Meylan
- M. Scodeggio (ORCID: https://orcid.org/0000-0002-2282-5850)
- S. Serrano (ORCID: https://orcid.org/0000-0002-0211-2861)
- G. Polenta (ORCID: https://orcid.org/0000-0003-4067-9196)
- E. Rossetti (ORCID: https://orcid.org/0000-0003-0238-4047)
- Gian Paolo Candini (ORCID: https://orcid.org/0000-0001-9481-8206)
- P. Jablonka (ORCID: https://orcid.org/0000-0002-9655-1063)
- Ian R. McDonald (ORCID: https://orcid.org/0000-0002-4847-6492)
- E. Branchini (ORCID: https://orcid.org/0000-0002-0808-6908)
- L. Pozzetti (ORCID: https://orcid.org/0000-0001-7085-0412)
- A. Cimatti (ORCID: https://orcid.org/0000-0002-4409-5633)
- G. De Lucia (ORCID: https://orcid.org/0000-0002-6220-9104)
- H. M. Courtois (ORCID: https://orcid.org/0000-0003-0509-1776)
- Yun Wang (ORCID: https://orcid.org/0000-0002-4749-2984)
- A. Da Silva (ORCID: https://orcid.org/0000-0002-6385-1609)
- L. Stančo (ORCID: https://orcid.org/0000-0002-9706-5104)
- Emanuele Zucca (ORCID: https://orcid.org/0000-0002-5522-6109)
- Ryota Nakajima (ORCID: https://orcid.org/0000-0003-1708-7109)
- J. Miró Carretero
- Nabila Aghanim (ORCID: https://orcid.org/0000-0002-6688-8992)
- Y. Mellier
- X. Dupac
- I. Tereno (ORCID: https://orcid.org/0000-0002-4537-6218)
- V. Pettorino (ORCID: https://orcid.org/0000-0002-4203-9320)
- H. Kurki‐Suonio
- P. Hudelot
- R. Kohley
- W. A. Holmes
- R. Laureijs (ORCID: https://orcid.org/0000-0001-9897-9779)
- P Schneider
- S. Maurogordato
- F. Hormuth
- K. Pedersen
- B. Kubik (ORCID: https://orcid.org/0009-0006-5823-4880)
- I. Lloro
- Y. Ascasíbar (ORCID: https://orcid.org/0000-0003-1577-2479)
- J.M Howell
- A. Mora
- M Kluge (ORCID: https://orcid.org/0009-0000-9214-3348)
- S. Ferriol
- M. Kümmel (ORCID: https://orcid.org/0000-0003-2791-2117)
- A. Renzi
- F. Marleau (ORCID: https://orcid.org/0000-0002-1442-2947)
Institutions
- Université Claude Bernard Lyon 1 (FR)
- University of Geneva (CH)
- Universidad Complutense de Madrid (ES)
- Leiden University (NL)
- California Institute of Technology (US)
- Herzberg Institute of Astrophysics (CA)
- Centre National de la Recherche Scientifique (FR)
- Institute of Space Sciences (ES)
- Jet Propulsion Laboratory (US)
- University of Helsinki (FI)
- Université Toulouse III - Paul Sabatier (FR)
- University of Bonn (DE)
- University of Padua (IT)
- University of Lisbon (PT)
- University of British Columbia (CA)
- Radboud University Nijmegen (NL)
- University of Waterloo (CA)
- Universidad de La Laguna (ES)
- University of Groningen (NL)
- Université Fédérale de Toulouse Midi-Pyrénées (FR)
- Universidade do Porto (PT)
- Perimeter Institute (CA)
- University of Oslo (NO)
- Institute for High Energy Physics (ES)
- University of Milan (IT)
- Durham University (GB)
- Universität Innsbruck (AT)
- Université Côte d'Azur (FR)
- The Open University (GB)
- Aarhus University (DK)
- Université Paris Cité (FR)
- Aix-Marseille Université (FR)
- University of Cambridge (GB)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- Centre National d'Études Spatiales (FR)
- Arcetri Astrophysical Observatory (IT)
- Helsinki Institute of Physics (FI)
- Astronomical Observatory of Rome (IT)
- Agenzia Spaziale Italiana (IT)
- Trieste Astronomical Observatory (IT)
- Institut d'Astrophysique de Paris (FR)
- Astronomical Observatory of Capodimonte (IT)
- European Space Agency (FR)
- Laboratoire AstroParticule et Cosmologie (FR)
- Observatoire astronomique de Strasbourg (FR)
- Brera Astronomical Observatory (IT)
- University of Surrey (GB)
- University of Manchester (GB)
- Universidad Politécnica de Cartagena (ES)
- ETH Zurich (CH)
- Sorbonne Université (FR)
- Técnicas Reunidas (Spain) (ES)
- Astrophysique, Instrumentation et Modélisation (FR)
- Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna (IT)
- Valongo Observatory (BR)
- Institute of Astrophysics and Space Sciences (PT)
- Max Planck Institute for Extraterrestrial Physics (DE)
- Institut d'Estudis Espacials de Catalunya (ES)
- European Space Astronomy Centre (ES)
- Centre de physique des particules de Marseille (FR)
- Laboratoire d’Astrophysique de Marseille (FR)
- Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT)
- Institute for Space Astrophysics and Planetology (IT)
- Institut d'Astrophysique Spatiale (FR)
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT)
- Osservatorio Astrofisico di Torino (IT)
- Royal Observatory (GB)
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT)
- Max Planck Institute for Astronomy (DE)
- Lagrange Laboratory (FR)
- Istituto di Radioastronomia di Bologna (IT)
- Château Gombert (FR)
- Cegep Edouard Montpetit (CA)
- Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT)
- Observatoire de la Côte d’Azur (FR)
- CEA Paris-Saclay (FR)
- Instituto de Astrofísica de Canarias (ES)
- Institut National de Physique Nucléaire et de Physique des Particules (FR)
- Institut de Ciència de Materials de Barcelona (ES)
- Institute of Space Science - INFLPR Subsidiary (RO)
- Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT)
- Port d'Informació Científica (ES)
- Institute for Fundamental Physics of the Universe (IT)
- Institute of Nuclear Physics of Lyon (FR)
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT)
- Osservatorio Astronomico di Padova (IT)
- European Space Research Institute (IT)
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES)
- Institut de Recherche en Astrophysique et Planétologie (FR)
- Infrared Processing and Analysis Center (US)
- University of Southampton (GB)
- Institut de Physique des 2 Infinis de Lyon (FR)
- European Space Research and Technology Centre (NL)
- University College London (GB)
- École Polytechnique Fédérale de Lausanne (CH)
- University of Turin (IT)
- Lancaster University (GB)
- Université de Strasbourg (FR)
- University of Chile (CL)
- Ludwig-Maximilians-Universität München (DE)
- University of Genoa (IT)
- Newcastle University (GB)
- National Institute for Astrophysics (IT)
- RWTH Aachen University (DE)
- Netherlands Institute for Radio Astronomy (NL)
- University of Bologna (IT)
- Universitat Politècnica de Catalunya (ES)
- Technical University of Denmark (DK)
- University of Edinburgh (GB)
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2024-08-22
- DOI
- https://doi.org/10.1051/0004-6361/202450781
- Citations
- 21
- Primary Topic
- Astronomy and Astrophysical Research
- Type
- article
- Field-Weighted Citation Impact
- 10.63
Funders
- Institut sur la Nutrition et les Aliments Fonctionnels
- Science and Technology Facilities Council