Figure 26 from The Next Generation Virgo Cluster Survey (NGVS). I. Introduction to the Survey

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The Next Generation Virgo Cluster Survey (NGVS). I. Introduction to the Survey

Authors: Laura Ferrarese, Patrick Côté, Jean-Charles Cuillandre, S. D. J. Gwyn, Eric W. Peng, Lauren A. MacArthur, Pierre-Alain Duc, A. Boselli, Simona Mei, Thomas Erben, Alan W. McConnachie, Patrick R. Durrell, J. Christopher Mihos, Andrés Jordán, Ariane Lançon, Thomas H. Puzia, Eric Emsellem, Michael L. Balogh, John P. Blakeslee, Ludovic van Waerbeke, Raphaël Gavazzi, Bernd Vollmer, J. J. Kavelaars, David Woods, Nicholas M. Ball, S. Boissier, Stéphane Courteau, E. Ferriere, G. Gavazzi, Hendrik Hildebrandt, P. Hudelot, M. Huertas-Company, Chengze Liu, Dean McLaughlin, Y. Mellier, Martha Milkeraitis, David Schade, Chantal Balkowski, Frédéric Bournaud, R. G. Carlberg, S. C. Chapman, Henk Hoekstra, Chien Peng, Marcin Sawicki, Luc Simard, James E. Taylor, R. Brent Tully, Wim van Driel, Christine D. Wilson, Todd Burdullis, Billy Mahoney, and Nadine Manset

Ferrarese et al. 2012 The Astrophysical Journal Supplement Series 200 4.

Provider: AAS Journals

Caption: Figure 26.

Hess diagram, showing the relative density of occurrence of stars in the i magnitude vs. g − i color plane, based on gi imaging for 14 million compact sources detected in the NGVS. Several prominent features are labeled, including the locus defined by the main-sequence turnoff stars in the Galactic halo, faint (mostly M dwarf) stars belonging to the Galactic disk, GCs in the Virgo cluster, and a large population of faint, compact background galaxies. The NGVS line of sight passes through a slice of the Galactic halo that includes the Sagittarius stream and the Virgo Overdensity. At the limiting magnitude of the NGVS, metal-poor main-sequence turnoff stars in the halo are visible to a distance of ~180 kpc.

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