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The extremely populated globular cluster
system of the lenticular galaxy NGC 6861
Lic. Carlos G. EscuderoDr. Favio R. FaiferDra. Lilia P. BassinoDr. Juan Pablo CalderónDr. Juan Pablo Caso
Toronto 2015 – Future & Science of Gemini ObservatoryEscudero et al. (2015)
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Machacek et al. (2010)
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Filters g', r', i' 0.43 - 0.88 arcsec
4x700 sec
4x350 sec
4x400 sec
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Galaxy surface proile and tidal structures
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Galaxy surface proile and tidal structures
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External arcs
Difuse surface
brightness
Galaxy surface proile and tidal structures
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Globular cluster colours
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Globular cluster colours
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Colour histograms
Blom et al. (2012)
View poster Escudero et al.
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Colour histograms
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(g'-i')0 0.88≤ 0.88<(g'-i')0<1.01 (g'-i')0 1.01≥
Colour histograms
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Spatial distribution
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Azimuthal properties
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Blue tilt
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Faifer et al. (2011)
Wehner et al. (2008)
Escudero et al. (2015)
Blue tilt
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Comparison with the hot gas emission
Forte et al. (2005)
Forbes et al. (2012)
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Comparison with the hot gas emission
Forte et al. (2005)
Forbes et al. (2012)
Machacek et al. (2010)
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Comparison with the hot gas emission
Forte et al. (2005)
Forbes et al. (2012)
Machacek et al. (2010)
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Total number of GCs and speciic frequency
Ntot: 3000 ± 300 GCs
SN = 9.2 ± 2.2 !!!
SN = NCG 100.4(Mv+15)
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Total number of GCs and speciic frequency
Ntot: 3000 ± 300 GCs
SN = 9.2 ± 2.2 !!!
SN = NCG 100.4(Mv+15)
Mhalo~10¹³ M☉
Harris et al. 2015
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Flamingos-2
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SUMMARY
* NGC 6861 presents signs of past interaction or merger
* The galaxy has a large GC system. By examining the colour histograms and the
CMD, we inferred the possible existence of a third subpopulation with intermediate
colours. However, spectroscopic and/or IR data are needed to perform an age-
metallicity study.
* The presence of a blue-tilt is detected in the blue subpopulation
* Outside 10 kpc, the blue subpopulation shows a remarkable similarity between the
projected density proile and the X-ray surface brightness proile of the galaxy. This
result would indicate that NGC 6861 could be the dominant galaxy in a galaxy sub-
group.
* We have estimated a total population of 3000±300 GCs for NGC 6861
* We obtained a high speciic frequency of SN=9.2±2.2. This high SN value could be
interpreted as a sign of the presence of a massive halo in NGC 6861.
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Gracias !!!