2025A&A...697A...8M

Query : 2025A&A...697A...8M

2025A&A...697A...8M - Astronomy and Astrophysics, volume 697A8 (2025/5-1)

Euclid: Early Release Observations - Unveiling the morphology of two Milky Way globular clusters out to their periphery.

MASSARI D., DALESSANDRO E., ERKAL D., BALBINOT E., BOVY J., McDONALD I., FERGUSON A.M.N., LARSEN S.S., LANCON A., ANNIBALI F., GOLDMAN B., KUZMA P.B., VOGGEL K., SAIFOLLAHI T., CUILLANDRE J.-C., SCHIRMER M., KLUGE M., ALTIERI B., AMARA A., ANDREON S., AURICCHIO N., BALDI M., BALESTRA A., BARDELLI S., BASSET A., BENDER R., BONINO D., BRANCHINI E., BRESCIA M., BRINCHMANN J., CAMERA S., CANDINI G.P., CAPOBIANCO V., CARBONE C., CARLBERG R.G., CARRETERO J., CASAS S., CASTELLANO M., CAVUOTI S., CIMATTI A., CONGEDO G., CONSELICE C.J., CONVERSI L., COPIN Y., CORCIONE L., COURBIN F., COURTOIS H.M., DEGAUDENZI H., DINIS J., DUBATH F., DUPAC X., DUSINI S., FABRICIUS M., FARINA M., FARRENS S., FERRIOL S., FRAILIS M., FRANCESCHI E., GARILLI B., GILLIS B., GIOCOLI C., GRAZIAN A., GUZZO L., HOAR J., HOEKSTRA H., HOLLIMAN M.S., HOLMES W., HOOK I., HORMUTH F., HORNSTRUP A., HUDELOT P., JAHNKE K., KEIHANEN E., KERMICHE S., KIESSLING A., KITCHING T., KOHLEY R., KUBIK B., KUMMEL M., KUNZ M., KURKI-SUONIO H., LIGORI S., LILJE P.B., LINDHOLM V., LLORO I., MAINO D., MAIORANO E., MANSUTTI O., MARGGRAF O., MARKOVIC K., MARTINET N., MARULLI F., MASSEY R., MAUROGORDATO S., MEDINACELI E., MEI S., MELLIER Y., MENEGHETTI M., MEYLAN G., MORESCO M., MOSCARDINI L., MUNARI E., NAKAJIMA R., NICHOL R.C., NIEMI S.-M., PADILLA C., PALTANI S., PASIAN F., PEDERSEN K., PERCIVAL W.J., PETTORINO V., PIRES S., POLENTA G., PONCET M., POPA L.A., POZZETTI L., RACCA G.D., RAISON F., REBOLO R., RENZI A., RHODES J., RICCIO G., RIX H.-W., ROMELLI E., RONCARELLI M., ROSSETTI E., SAGLIA R., SAPONE D., SARTORIS B., SCHNEIDER P., SCHRABBACK T., SECROUN A., SEIDEL G., SEIFFERT M., SERRANO S., SIRIGNANO C., SIRRI G., SKOTTFELT J., STANCO L., TALLADA-CRESPI P., TEPLITZ H.I., TERENO I., TOLEDO-MOREO R., TORRADEFLOT F., TUTUSAUS I., VALENZIANO L., VASSALLO T., VEROPALUMBO A., WANG Y., WELLER J., ZACCHEI A., ZAMORANI G., ZOUBIAN J., ZUCCA E., BOLZONELLA M., BURIGANA C., MORRIS P.W., SCOTTEZ V., SIMON P., MARTIN-FLEITAS J. and SCOTT D.

Abstract (from CDS):

As part of the Euclid Early Release Observations (ERO) programme, we analysed deep, wide-field imaging from the VIS and NISP instruments of two Milky Way globular clusters (GCs), namely NGC 6254 (M10) and NGC 6397, to look for observational evidence of their dynamical interaction with the Milky Way. We searched for such an interaction in the form of structural and morphological features in the clusters' outermost regions, which would be suggestive of the development of tidal tails on scales larger than those sampled by the ERO data. From our multi-band photometric analysis, we obtained deep and well-behaved colour-magnitude diagrams that, in turn, enabled an accurate membership selection. The surface brightness profiles built from these samples of member stars are the deepest ever obtained for these two Milky Way GCs, reaching down to ∼30.0 mag/arcsec2, which is ∼1.5 mag/arcsec2 lower than before. The investigation of the two-dimensional density map of NGC 6254 reveals an elongated morphology of the cluster peripheries in the direction and with the amplitude predicted by N-body simulations of the cluster's dynamical evolution, at high statistical significance. We interpret this as strong evidence for the first detection of tidally induced morphological distortion around this cluster. The density map of NGC 6397 reveals a slightly elliptical morphology, in agreement with previous studies, which requires further investigation on larger scales to be properly interpreted. This ERO project thus demonstrates the power of Euclid in studying the outer regions of GCs at an unprecedented level of detail, thanks to the combination of the large field of view, high spatial resolution, and depth enabled by the telescope. Our results highlight the future Euclid survey as the ideal dataset for investigating GC tidal tails and stellar streams.

Abstract Copyright: © The Authors 2025

Journal keyword(s): stars: imaging - Galaxy: evolution - globular clusters: general - Galaxy: structure - globular clusters: individual: NGC 6254 - globular clusters: individual: NGC 6397

VizieR on-line data: <Available at CDS (J/A+A/697/A8): m10.dat ngc6397.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
2 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
3 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
4 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
5 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0

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