Details

Autor(en) / Beteiligte

• Old, L
• Skibba, R. A
• Pearce, F. R
• Croton, D
• Muldrew, S. I
• Muñoz-Cuartas, J. C
• Gifford, D
• Gray, M. E
• der Linden, A. von
• Mamon, G. A
• Merrifield, M. R
• Müller, V
• Pearson, R. J
• Ponman, T. J
• Saro, A
• Sepp, T
• Sifón, C
• Tempel, E
• Tundo, E
• Wang, Y. O
• Wojtak, R

Titel

Galaxy cluster mass reconstruction project – I. Methods and first results on galaxy-based techniques

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2014-06, Vol.441 (2), p.1513-1536

Ort / Verlag

London: Oxford University Press

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• This paper is the first in a series in which we perform an extensive comparison of various galaxy-based cluster mass estimation techniques that utilize the positions, velocities and colours of galaxies. Our primary aim is to test the performance of these cluster mass estimation techniques on a diverse set of models that will increase in complexity. We begin by providing participating methods with data from a simple model that delivers idealized clusters, enabling us to quantify the underlying scatter intrinsic to these mass estimation techniques. The mock catalogue is based on a Halo Occupation Distribution (HOD) model that assumes spherical Navarro, Frenk and White (NFW) haloes truncated at R 200, with no substructure nor colour segregation, and with isotropic, isothermal Maxwellian velocities. We find that, above 1014M⊙, recovered cluster masses are correlated with the true underlying cluster mass with an intrinsic scatter of typically a factor of 2. Below 1014M⊙, the scatter rises as the number of member galaxies drops and rapidly approaches an order of magnitude. We find that richness-based methods deliver the lowest scatter, but it is not clear whether such accuracy may simply be the result of using an over-simplistic model to populate the galaxies in their haloes. Even when given the true cluster membership, large scatter is observed for the majority non-richness-based approaches, suggesting that mass reconstruction with a low number of dynamical tracers is inherently problematic.