IALP 13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Tracing the assembly history of NGC 1395 through its Globular Cluster System
Autor/es:
ESCUDERO, C. G.; FORTE, J. C.; SCALIA, M. C.; SMITH CASTELLI, A. V.; GONZALEZ, N. M.; FAIFER, F. R.; SESTO, L. A.; ESCUDERO, C. G.; FORTE, J. C.; SCALIA, M. C.; SMITH CASTELLI, A. V.; GONZALEZ, N. M.; FAIFER, F. R.; SESTO, L. A.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2018 vol. 474 p. 4302 - 4321
ISSN:
0035-8711
Resumen:
We used deep Gemini-South/GMOSg΄r΄i΄z΄images to study the globular cluster (GC) system of the massiveelliptical galaxy NGC 1395, located in the Eridanus supergroup. Thephotometric analysis of the GC candidates reveals a clear colourbimodality distribution, indicating the presence of `blue´ and `red´ GCsubpopulations. While a negative radial colour gradient is detected inthe projected spatial distribution of the red GCs, the blue GCs displaya shallow colour gradient. The blue GCs also display a remarkableshallow and extended surface density profile, suggesting a significantaccretion of low-mass satellites in the outer halo of the galaxy. Inaddition, the slope of the projected spatial distribution of the blueGCs in the outer regions of the galaxy, is similar to that of the X-rayhalo emission. Integrating up to 165 kpc the profile of the projectedspatial distribution of the GCs, we estimated a total GC population andspecific frequency of 6000 ± 1100 and SN = 7.4± 1.4, respectively. Regarding NGC 1395 itself, the analysis ofthe deep Gemini/GMOS images shows a low surface brightness umbrella-likestructure indicating, at least, one recent merger event. Throughrelations recently published in the literature, we obtained globalparameters, such as Mstellar = 9.32 × 1011M⊙ and Mh = 6.46 × 1013M⊙. Using public spectroscopic data, we derive stellarpopulation parameters of the central region of the galaxy by the fullspectral fitting technique. We have found that this region seems to bedominated for an old stellar population, in contrast to findings ofyoung stellar populations from the literature.
