Euclid: Early Release Observations - The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC6822

J. M. Howell; A. M. N. Ferguson; S. S. Larsen; A. Lancon; F. Annibali; J. -C. Cuillandre; L. K. Hunt; D. Martinez-Delgado; D. Massari; T. Saifollahi; K. Voggel; B. Altieri; S. Andreon; N. Auricchio; C. Baccigalupi; M. Baldi; S. Bardelli; A. Biviano; E. Branchini; M. Brescia; J. Brinchmann; S. Camera; G. Canas-Herrera; G. P. Candini; V. Capobianco; C. Carbone; J. Carretero; M. Castellano; G. Castignani; S. Cavuoti; A. Cimatti; C. Colodro-Conde; G. Congedo; C. J. Conselice; L. Conversi; Y. Copin; F. Courbin; M. Cropper; A. Da Silva; H. Degaudenzi; G. De Lucia; F. Dubath; C. A. J. Duncan; X. Dupac; S. Dusini; S. Escoffier; M. Farina; R. Farinelli; F. Faustini; S. Ferriol; F. Finelli; M. Frailis; E. Franceschi; M. Fumana; S. Galeotta; K. George; B. Gillis; C. Giocoli; J. Gracia-Carpio; A. Grazian; F. Grupp; S. V. H. Haugan; H. Hoekstra; W. Holmes; F. Hormuth; A. Hornstrup; K. Jahnke; M. Jhabvala; E. Keihanen; S. Kermiche; B. Kubik; M. Kuemmel; M. Kunz; H. Kurki-Suonio; A. M. C. Le Brun; D. Le Mignant; S. Ligori; P. B. Lilje; V. Lindholm; I. Lloro; G. Mainetti; D. Maino; E. Maiorano; O. Mansutti; O. Marggraf; M. Martinelli; N. Martinet; F. Marulli; R. J. Massey; E. Medinaceli; S. Mei; M. Melchior; Y. Mellier; M. Meneghetti; E. Merlin; G. Meylan; A. Mora; M. Moresco; L. Moscardini; R. Nakajima; C. Neissner; S. -M. Niemi; C. Padilla; S. Paltani; F. Pasian; K. Pedersen; W. J. Percival; V. Pettorino; S. Pires; G. Polenta; M. Poncet; L. A. Popa; F. Raison; A. Renzi; J. Rhodes; G. Riccio; E. Romelli; M. Roncarelli; R. Saglia; Z. Sakr; D. Sapone; B. Sartoris; M. Schirmer; P. Schneider; T. Schrabback; A. Secroun; G. Seidel; S. Serrano; P. Simon; C. Sirignano; G. Sirri; J. Skottfelt; L. Stanco; J. Steinwagner; P. Tallada-Crespi; A. N. Taylor; H. I. Teplitz; I. Tereno; S. Toft; R. Toledo-Moreo; F. Torradeflot; I. Tutusaus; L. Valenziano; J. Valiviita; T. Vassallo; Y. Wang; J. Weller; G. Zamorani; I. A. Zinchenko; J. Martin-Fleitas; V. Scottez

doi:10.1051/0004-6361/202556953

Euclid: Early Release Observations - The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC6822

J. M. Howell, A. M. N. Ferguson, S. S. Larsen, A. Lancon, F. Annibali, J. -C. Cuillandre, L. K. Hunt, D. Martinez-Delgado, D. Massari, T. Saifollahi, K. Voggel, B. Altieri, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, A. Biviano, E. Branchini, M. BresciaJ. Brinchmann, S. Camera, G. Canas-Herrera, G. P. Candini, V. Capobianco, C. Carbone, J. Carretero, M. Castellano, G. Castignani, S. Cavuoti, A. Cimatti, C. Colodro-Conde, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, G. De Lucia, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Escoffier, M. Farina, R. Farinelli, F. Faustini, S. Ferriol, F. Finelli, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, K. George, B. Gillis, C. Giocoli, J. Gracia-Carpio, A. Grazian, F. Grupp, S. V. H. Haugan, H. Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, K. Jahnke, M. Jhabvala, E. Keihanen, S. Kermiche, B. Kubik, M. Kuemmel, M. Kunz, H. Kurki-Suonio, A. M. C. Le Brun, D. Le Mignant, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, G. Mainetti, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf, M. Martinelli, N. Martinet, F. Marulli, R. J. Massey, E. Medinaceli, S. Mei, M. Melchior, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, A. Mora, M. Moresco, L. Moscardini, R. Nakajima, C. Neissner, S. -M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V. Pettorino, S. Pires, G. Polenta, M. Poncet, L. A. Popa, F. Raison, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, R. Saglia, Z. Sakr, D. Sapone, B. Sartoris, M. Schirmer, P. Schneider, T. Schrabback, A. Secroun, G. Seidel, S. Serrano, P. Simon, C. Sirignano, G. Sirri, J. Skottfelt, L. Stanco, J. Steinwagner, P. Tallada-Crespi, A. N. Taylor, H. I. Teplitz, I. Tereno, S. Toft, R. Toledo-Moreo, F. Torradeflot, I. Tutusaus, L. Valenziano, J. Valiviita, T. Vassallo, Y. Wang, J. Weller, G. Zamorani, I. A. Zinchenko, J. Martin-Fleitas, V. Scottez

The Cosmic Dawn Center

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Abstract

Star clusters are valuable indicators of galaxy evolution, offering insights into the buildup of stellar populations across cosmic time. Understanding the intrinsic star cluster populations of dwarf galaxies is particularly important given these systems' role in the hierarchical growth of larger systems. We use data from Euclid's Early Release Observation programme to study star clusters in two star-forming dwarf irregular galaxies in the Local Group, NGC6822 and IC 10 [M star similar to (1-4) x10(8) M-circle dot]. With Euclid, star clusters are resolved into individual stars across the main bodies and haloes of both galaxies. Through visual inspection of the IE images, we uncover 30 new star cluster candidates in NGC6822 and 16 in IC 10, ranging from compact to diffuse extended clusters. We compile and re-evaluate previously identified literature candidates, resulting in final combined catalogues of 52 (NGC6822) and 71 (IC 10) cluster candidates with confidence-based classifications. We present homogeneous photometry in I-E, Y-E, J(E), and H-E, and in archival UBVRI data, alongside size measurements and properties derived from the spectral energy distribution fitting code BAGPIPES. Through synthetic cluster injection, we conclude our sample is similar to 50% complete to M <= 10(3) M-circle dot for ages less than or similar to 100 Myr, and to M less than or similar to 2 x 10(4) M. for ages of similar to 10 Gyr. We find that IC 10 has more young clusters than NGC6822, and its young clusters extend to higher masses, consistent with its starburst nature. We find several old massive (>= 10(5) M-circle dot) clusters in both dwarfs, including an exceptional cluster in NGC6822's outskirts with a mass of 1.3 x 10(6) M-circle dot, nearly twice as massive as any other old cluster in either galaxy. In NGC6822, we also identify a previously undetected, old, and extended cluster (R-h = 12.4 +/- 0.11 pc). Using well-defined criteria, we identify 11 candidate GCs in NGC6822 and nine in IC 10. Both galaxies have high specific frequencies (S-N) for their luminosities but remain consistent with the known GC scaling relationships in the low-luminosity regime.

Originalsprog	Engelsk
Artikelnummer	A185
Tidsskrift	Astronomy & Astrophysics
Vol/bind	706
Antal sider	27
ISSN	0004-6361
DOI	https://doi.org/10.1051/0004-6361/202556953
Status	Udgivet - 12 feb. 2026

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10.1051/0004-6361/202556953Licens: CC BY

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Howell, J. M., Ferguson, A. M. N., Larsen, S. S., Lancon, A., Annibali, F., Cuillandre, J. .-C., Hunt, L. K., Martinez-Delgado, D., Massari, D., Saifollahi, T., Voggel, K., Altieri, B., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Biviano, A., Branchini, E., ... Scottez, V. (2026). Euclid: Early Release Observations - The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC6822. Astronomy & Astrophysics, 706, Artikel A185. https://doi.org/10.1051/0004-6361/202556953

Howell, JM, Ferguson, AMN, Larsen, SS, Lancon, A, Annibali, F, Cuillandre, J-C, Hunt, LK, Martinez-Delgado, D, Massari, D, Saifollahi, T, Voggel, K, Altieri, B, Andreon, S, Auricchio, N, Baccigalupi, C, Baldi, M, Bardelli, S, Biviano, A, Branchini, E, Brescia, M, Brinchmann, J, Camera, S, Canas-Herrera, G, Candini, GP, Capobianco, V, Carbone, C, Carretero, J, Castellano, M, Castignani, G, Cavuoti, S, Cimatti, A, Colodro-Conde, C, Congedo, G, Conselice, CJ, Conversi, L, Copin, Y, Courbin, F, Cropper, M, Da Silva, A, Degaudenzi, H, De Lucia, G, Dubath, F, Duncan, CAJ, Dupac, X, Dusini, S, Escoffier, S, Farina, M, Farinelli, R, Faustini, F, Ferriol, S, Finelli, F, Frailis, M, Franceschi, E, Fumana, M, Galeotta, S, George, K, Gillis, B, Giocoli, C, Gracia-Carpio, J, Grazian, A, Grupp, F, Haugan, SVH, Hoekstra, H, Holmes, W, Hormuth, F, Hornstrup, A, Jahnke, K, Jhabvala, M, Keihanen, E, Kermiche, S, Kubik, B, Kuemmel, M, Kunz, M, Kurki-Suonio, H, Le Brun, AMC, Le Mignant, D, Ligori, S, Lilje, PB, Lindholm, V, Lloro, I, Mainetti, G, Maino, D, Maiorano, E, Mansutti, O, Marggraf, O, Martinelli, M, Martinet, N, Marulli, F, Massey, RJ, Medinaceli, E, Mei, S, Melchior, M, Mellier, Y, Meneghetti, M, Merlin, E, Meylan, G, Mora, A, Moresco, M, Moscardini, L, Nakajima, R, Neissner, C, Niemi, S-M, Padilla, C, Paltani, S, Pasian, F, Pedersen, K, Percival, WJ, Pettorino, V, Pires, S, Polenta, G, Poncet, M, Popa, LA, Raison, F, Renzi, A, Rhodes, J, Riccio, G, Romelli, E, Roncarelli, M, Saglia, R, Sakr, Z, Sapone, D, Sartoris, B, Schirmer, M, Schneider, P, Schrabback, T, Secroun, A, Seidel, G, Serrano, S, Simon, P, Sirignano, C, Sirri, G, Skottfelt, J, Stanco, L, Steinwagner, J, Tallada-Crespi, P, Taylor, AN, Teplitz, HI, Tereno, I, Toft, S, Toledo-Moreo, R, Torradeflot, F, Tutusaus, I, Valenziano, L, Valiviita, J, Vassallo, T, Wang, Y, Weller, J, Zamorani, G, Zinchenko, IA, Martin-Fleitas, J & Scottez, V 2026, 'Euclid: Early Release Observations - The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC6822', Astronomy & Astrophysics, bind 706, A185. https://doi.org/10.1051/0004-6361/202556953

@article{da5b8233c8c1472abfd3e5d799cdfd39,

title = "Euclid: Early Release Observations - The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC6822",

abstract = "Star clusters are valuable indicators of galaxy evolution, offering insights into the buildup of stellar populations across cosmic time. Understanding the intrinsic star cluster populations of dwarf galaxies is particularly important given these systems' role in the hierarchical growth of larger systems. We use data from Euclid's Early Release Observation programme to study star clusters in two star-forming dwarf irregular galaxies in the Local Group, NGC6822 and IC 10 [M star similar to (1-4) x10(8) M-circle dot]. With Euclid, star clusters are resolved into individual stars across the main bodies and haloes of both galaxies. Through visual inspection of the IE images, we uncover 30 new star cluster candidates in NGC6822 and 16 in IC 10, ranging from compact to diffuse extended clusters. We compile and re-evaluate previously identified literature candidates, resulting in final combined catalogues of 52 (NGC6822) and 71 (IC 10) cluster candidates with confidence-based classifications. We present homogeneous photometry in I-E, Y-E, J(E), and H-E, and in archival UBVRI data, alongside size measurements and properties derived from the spectral energy distribution fitting code BAGPIPES. Through synthetic cluster injection, we conclude our sample is similar to 50% complete to M <= 10(3) M-circle dot for ages less than or similar to 100 Myr, and to M less than or similar to 2 x 10(4) M. for ages of similar to 10 Gyr. We find that IC 10 has more young clusters than NGC6822, and its young clusters extend to higher masses, consistent with its starburst nature. We find several old massive (>= 10(5) M-circle dot) clusters in both dwarfs, including an exceptional cluster in NGC6822's outskirts with a mass of 1.3 x 10(6) M-circle dot, nearly twice as massive as any other old cluster in either galaxy. In NGC6822, we also identify a previously undetected, old, and extended cluster (R-h = 12.4 +/- 0.11 pc). Using well-defined criteria, we identify 11 candidate GCs in NGC6822 and nine in IC 10. Both galaxies have high specific frequencies (S-N) for their luminosities but remain consistent with the known GC scaling relationships in the low-luminosity regime.",

keywords = "Local Group galaxies, Galaxies: dwarf, galaxies: individual: IC 10, galaxies: individual: NGC 6822, Star clusters: general",

author = "Howell, {J. M.} and Ferguson, {A. M. N.} and Larsen, {S. S.} and A. Lancon and F. Annibali and Cuillandre, {J. -C.} and Hunt, {L. K.} and D. Martinez-Delgado and D. Massari and T. Saifollahi and K. Voggel and B. Altieri and S. Andreon and N. Auricchio and C. Baccigalupi and M. Baldi and S. Bardelli and A. Biviano and E. Branchini and M. Brescia and J. Brinchmann and S. Camera and G. Canas-Herrera and Candini, {G. P.} and V. Capobianco and C. Carbone and J. Carretero and M. Castellano and G. Castignani and S. Cavuoti and A. Cimatti and C. Colodro-Conde and G. Congedo and Conselice, {C. J.} and L. Conversi and Y. Copin and F. Courbin and M. Cropper and {Da Silva}, A. and H. Degaudenzi and {De Lucia}, G. and F. Dubath and Duncan, {C. A. J.} and X. Dupac and S. Dusini and S. Escoffier and M. Farina and R. Farinelli and F. Faustini and S. Ferriol and F. Finelli and M. Frailis and E. Franceschi and M. Fumana and S. Galeotta and K. George and B. Gillis and C. Giocoli and J. Gracia-Carpio and A. Grazian and F. Grupp and Haugan, {S. V. H.} and H. Hoekstra and W. Holmes and F. Hormuth and A. Hornstrup and K. Jahnke and M. Jhabvala and E. Keihanen and S. Kermiche and B. Kubik and M. Kuemmel and M. Kunz and H. Kurki-Suonio and {Le Brun}, {A. M. C.} and {Le Mignant}, D. and S. Ligori and Lilje, {P. B.} and V. Lindholm and I. Lloro and G. Mainetti and D. Maino and E. Maiorano and O. Mansutti and O. Marggraf and M. Martinelli and N. Martinet and F. Marulli and Massey, {R. J.} and E. Medinaceli and S. Mei and M. Melchior and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and A. Mora and M. Moresco and L. Moscardini and R. Nakajima and C. Neissner and Niemi, {S. -M.} and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and Percival, {W. J.} and V. Pettorino and S. Pires and G. Polenta and M. Poncet and Popa, {L. A.} and F. Raison and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and R. Saglia and Z. Sakr and D. Sapone and B. Sartoris and M. Schirmer and P. Schneider and T. Schrabback and A. Secroun and G. Seidel and S. Serrano and P. Simon and C. Sirignano and G. Sirri and J. Skottfelt and L. Stanco and J. Steinwagner and P. Tallada-Crespi and Taylor, {A. N.} and Teplitz, {H. I.} and I. Tereno and S. Toft and R. Toledo-Moreo and F. Torradeflot and I. Tutusaus and L. Valenziano and J. Valiviita and T. Vassallo and Y. Wang and J. Weller and G. Zamorani and Zinchenko, {I. A.} and J. Martin-Fleitas and V. Scottez",

year = "2026",

month = feb,

day = "12",

doi = "10.1051/0004-6361/202556953",

language = "English",

volume = "706",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "E D P Sciences",

}

TY - JOUR

T1 - Euclid

T2 - Early Release Observations - The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC6822

AU - Howell, J. M.

AU - Ferguson, A. M. N.

AU - Larsen, S. S.

AU - Lancon, A.

AU - Annibali, F.

AU - Cuillandre, J. -C.

AU - Hunt, L. K.

AU - Martinez-Delgado, D.

AU - Massari, D.

AU - Saifollahi, T.

AU - Voggel, K.

AU - Altieri, B.

AU - Andreon, S.

AU - Auricchio, N.

AU - Baccigalupi, C.

AU - Baldi, M.

AU - Bardelli, S.

AU - Biviano, A.

AU - Branchini, E.

AU - Brescia, M.

AU - Brinchmann, J.

AU - Camera, S.

AU - Canas-Herrera, G.

AU - Candini, G. P.

AU - Capobianco, V.

AU - Carbone, C.

AU - Carretero, J.

AU - Castellano, M.

AU - Castignani, G.

AU - Cavuoti, S.

AU - Cimatti, A.

AU - Colodro-Conde, C.

AU - Congedo, G.

AU - Conselice, C. J.

AU - Conversi, L.

AU - Copin, Y.

AU - Courbin, F.

AU - Cropper, M.

AU - Da Silva, A.

AU - Degaudenzi, H.

AU - De Lucia, G.

AU - Dubath, F.

AU - Duncan, C. A. J.

AU - Dupac, X.

AU - Dusini, S.

AU - Escoffier, S.

AU - Farina, M.

AU - Farinelli, R.

AU - Faustini, F.

AU - Ferriol, S.

AU - Finelli, F.

AU - Frailis, M.

AU - Franceschi, E.

AU - Fumana, M.

AU - Galeotta, S.

AU - George, K.

AU - Gillis, B.

AU - Giocoli, C.

AU - Gracia-Carpio, J.

AU - Grazian, A.

AU - Grupp, F.

AU - Haugan, S. V. H.

AU - Hoekstra, H.

AU - Holmes, W.

AU - Hormuth, F.

AU - Hornstrup, A.

AU - Jahnke, K.

AU - Jhabvala, M.

AU - Keihanen, E.

AU - Kermiche, S.

AU - Kubik, B.

AU - Kuemmel, M.

AU - Kunz, M.

AU - Kurki-Suonio, H.

AU - Le Brun, A. M. C.

AU - Le Mignant, D.

AU - Ligori, S.

AU - Lilje, P. B.

AU - Lindholm, V.

AU - Lloro, I.

AU - Mainetti, G.

AU - Maino, D.

AU - Maiorano, E.

AU - Mansutti, O.

AU - Marggraf, O.

AU - Martinelli, M.

AU - Martinet, N.

AU - Marulli, F.

AU - Massey, R. J.

AU - Medinaceli, E.

AU - Mei, S.

AU - Melchior, M.

AU - Mellier, Y.

AU - Meneghetti, M.

AU - Merlin, E.

AU - Meylan, G.

AU - Mora, A.

AU - Moresco, M.

AU - Moscardini, L.

AU - Nakajima, R.

AU - Neissner, C.

AU - Niemi, S. -M.

AU - Padilla, C.

AU - Paltani, S.

AU - Pasian, F.

AU - Pedersen, K.

AU - Percival, W. J.

AU - Pettorino, V.

AU - Pires, S.

AU - Polenta, G.

AU - Poncet, M.

AU - Popa, L. A.

AU - Raison, F.

AU - Renzi, A.

AU - Rhodes, J.

AU - Riccio, G.

AU - Romelli, E.

AU - Roncarelli, M.

AU - Saglia, R.

AU - Sakr, Z.

AU - Sapone, D.

AU - Sartoris, B.

AU - Schirmer, M.

AU - Schneider, P.

AU - Schrabback, T.

AU - Secroun, A.

AU - Seidel, G.

AU - Serrano, S.

AU - Simon, P.

AU - Sirignano, C.

AU - Sirri, G.

AU - Skottfelt, J.

AU - Stanco, L.

AU - Steinwagner, J.

AU - Tallada-Crespi, P.

AU - Taylor, A. N.

AU - Teplitz, H. I.

AU - Tereno, I.

AU - Toft, S.

AU - Toledo-Moreo, R.

AU - Torradeflot, F.

AU - Tutusaus, I.

AU - Valenziano, L.

AU - Valiviita, J.

AU - Vassallo, T.

AU - Wang, Y.

AU - Weller, J.

AU - Zamorani, G.

AU - Zinchenko, I. A.

AU - Martin-Fleitas, J.

AU - Scottez, V.

PY - 2026/2/12

Y1 - 2026/2/12

N2 - Star clusters are valuable indicators of galaxy evolution, offering insights into the buildup of stellar populations across cosmic time. Understanding the intrinsic star cluster populations of dwarf galaxies is particularly important given these systems' role in the hierarchical growth of larger systems. We use data from Euclid's Early Release Observation programme to study star clusters in two star-forming dwarf irregular galaxies in the Local Group, NGC6822 and IC 10 [M star similar to (1-4) x10(8) M-circle dot]. With Euclid, star clusters are resolved into individual stars across the main bodies and haloes of both galaxies. Through visual inspection of the IE images, we uncover 30 new star cluster candidates in NGC6822 and 16 in IC 10, ranging from compact to diffuse extended clusters. We compile and re-evaluate previously identified literature candidates, resulting in final combined catalogues of 52 (NGC6822) and 71 (IC 10) cluster candidates with confidence-based classifications. We present homogeneous photometry in I-E, Y-E, J(E), and H-E, and in archival UBVRI data, alongside size measurements and properties derived from the spectral energy distribution fitting code BAGPIPES. Through synthetic cluster injection, we conclude our sample is similar to 50% complete to M <= 10(3) M-circle dot for ages less than or similar to 100 Myr, and to M less than or similar to 2 x 10(4) M. for ages of similar to 10 Gyr. We find that IC 10 has more young clusters than NGC6822, and its young clusters extend to higher masses, consistent with its starburst nature. We find several old massive (>= 10(5) M-circle dot) clusters in both dwarfs, including an exceptional cluster in NGC6822's outskirts with a mass of 1.3 x 10(6) M-circle dot, nearly twice as massive as any other old cluster in either galaxy. In NGC6822, we also identify a previously undetected, old, and extended cluster (R-h = 12.4 +/- 0.11 pc). Using well-defined criteria, we identify 11 candidate GCs in NGC6822 and nine in IC 10. Both galaxies have high specific frequencies (S-N) for their luminosities but remain consistent with the known GC scaling relationships in the low-luminosity regime.

AB - Star clusters are valuable indicators of galaxy evolution, offering insights into the buildup of stellar populations across cosmic time. Understanding the intrinsic star cluster populations of dwarf galaxies is particularly important given these systems' role in the hierarchical growth of larger systems. We use data from Euclid's Early Release Observation programme to study star clusters in two star-forming dwarf irregular galaxies in the Local Group, NGC6822 and IC 10 [M star similar to (1-4) x10(8) M-circle dot]. With Euclid, star clusters are resolved into individual stars across the main bodies and haloes of both galaxies. Through visual inspection of the IE images, we uncover 30 new star cluster candidates in NGC6822 and 16 in IC 10, ranging from compact to diffuse extended clusters. We compile and re-evaluate previously identified literature candidates, resulting in final combined catalogues of 52 (NGC6822) and 71 (IC 10) cluster candidates with confidence-based classifications. We present homogeneous photometry in I-E, Y-E, J(E), and H-E, and in archival UBVRI data, alongside size measurements and properties derived from the spectral energy distribution fitting code BAGPIPES. Through synthetic cluster injection, we conclude our sample is similar to 50% complete to M <= 10(3) M-circle dot for ages less than or similar to 100 Myr, and to M less than or similar to 2 x 10(4) M. for ages of similar to 10 Gyr. We find that IC 10 has more young clusters than NGC6822, and its young clusters extend to higher masses, consistent with its starburst nature. We find several old massive (>= 10(5) M-circle dot) clusters in both dwarfs, including an exceptional cluster in NGC6822's outskirts with a mass of 1.3 x 10(6) M-circle dot, nearly twice as massive as any other old cluster in either galaxy. In NGC6822, we also identify a previously undetected, old, and extended cluster (R-h = 12.4 +/- 0.11 pc). Using well-defined criteria, we identify 11 candidate GCs in NGC6822 and nine in IC 10. Both galaxies have high specific frequencies (S-N) for their luminosities but remain consistent with the known GC scaling relationships in the low-luminosity regime.

KW - Local Group galaxies

KW - Galaxies: dwarf

KW - galaxies: individual: IC 10

KW - galaxies: individual: NGC 6822

KW - Star clusters: general

U2 - 10.1051/0004-6361/202556953

DO - 10.1051/0004-6361/202556953

M3 - Journal article

SN - 0004-6361

VL - 706

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A185

ER -