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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 20.

Images and 1D surface brightness profiles for three spectroscopically confirmed UCDs in the core of the Virgo cluster (1316 2 = S999; 1316 5 = S928; and 1316 3 = H8005; see Haşegan et al. 2005). Along each row, we show the HST F475W image (6'' × 6'') from the ACS Virgo Cluster Survey (left panel), the g-band image from the NGVS (middle panel) and the surface brightness profiles derived from these images (right panel). The red and blue circles in the first two panels along the upper row compare the seeing disks from HST (FWHM sime 0 farcs1) and CFHT ( sime 0 farcs58). The corresponding PSF profiles are plotted as the red and blue dashed curves, respectively, in the right panels. The red and blue points show, respectively, the HST and NGVS profiles for each UCD, while the cyan dots show the expected pixel values for the NGVS imaging after convolving the best-fit UCD model derived from the HST imaging with the NGVS PSF (note that neighboring objects are not masked, explaining the flaring in the cyan points in the middle right panel). This comparison demonstrates that these UCDs, which have half-light radii in the range r h ≈ 20–25 pc, are spatially resolved in the NGVS imaging.

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