A Revised Velocity for the Globular Cluster GC-98 in the Ultra Diffuse Galaxy 
NGC 1052-DF2

van Dokkum, Pieter; Cohen, Yotam; Danieli, Shany; Romanowsky, Aaron; Abraham, Roberto; Brodie, Jean; Conroy, Charlie; Kruijssen, J. M. Diederik; Lokhorst, Deborah; Merritt, Allison; Mowla, Lamiya; Zhang, Jielai

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A Revised Velocity for the Globular Cluster GC-98 in the Ultra Diffuse Galaxy NGC 1052-DF2

MPS-Authors

van Dokkum, Pieter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cohen, Yotam
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Danieli, Shany
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Romanowsky, Aaron
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Abraham, Roberto
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brodie, Jean
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Conroy, Charlie
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kruijssen, J. M. Diederik
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lokhorst, Deborah
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Merritt, Allison
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mowla, Lamiya
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhang, Jielai
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018RNAAS...2b..54V
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Citation

van Dokkum, P., Cohen, Y., Danieli, S., Romanowsky, A., Abraham, R., Brodie, J., et al. (2018). A Revised Velocity for the Globular Cluster GC-98 in the Ultra Diffuse Galaxy NGC 1052-DF2. Research Notes of the American Astronomical Society, 2.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CA86-0

Abstract

We recently published velocity measurements of luminous globular clusters in the galaxy NGC1052-DF2, concluding that it lies far off the canonical stellar mass - halo mass relation. Here we present a revised velocity for one of the globular clusters, GC-98, and a revised velocity dispersion measurement for the galaxy. We find that the intrinsic dispersion $\sigma=5.6^{+5.2}_{-3.8}$ km/s using Approximate Bayesian Computation, or $\sigma=7.8^{+5.2}_{-2.2}$ km/s using the likelihood. The expected dispersion from the stars alone is ~7 km/s. Responding to a request from the Editors of ApJ Letters and RNAAS, we also briefly comment on the recent analysis of our measurements by Martin et al. (2018).