A Dwarf Disrupting - Andromeda XXVII and the North West Stream

Preston, Janet; Collins, Michelle L. M.; Ibata, Rodrigo A.; Tollerud, Erik J.; Rich, R. Michael; Bonaca, Ana; McConnachie, Alan W.; Mackey, Dougal; Lewis, Geraint F.; Martin, Nicolas F.; Peñarrubia, Jorge; Chapman, Scott C.; Delorme, Maxime

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A Dwarf Disrupting - Andromeda XXVII and the North West Stream

MPS-Authors

Preston, Janet
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collins, Michelle L. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ibata, Rodrigo A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tollerud, Erik J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rich, R. Michael
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bonaca, Ana
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

McConnachie, Alan W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mackey, Dougal
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lewis, Geraint F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martin, Nicolas F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Peñarrubia, Jorge
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chapman, Scott C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Delorme, Maxime
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019MNRAS.tmp.2178P
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Citation

Preston, J., Collins, M. L. M., Ibata, R. A., Tollerud, E. J., Rich, R. M., Bonaca, A., et al. (2019). A Dwarf Disrupting - Andromeda XXVII and the North West Stream. Monthly Notices of the Royal Astronomical Society, 2178.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D000-F

Abstract

We present a kinematic and spectroscopic analysis of 38 red giant branch stars, in 7 fields, spanning the dwarf spheroidal galaxy Andromeda XXVII and the upper segment of the North West Stream. Both features are located in the outer halo of the Andromeda galaxy at a projected radius of 50-80 kpc, with the stream extending for ̃3° on the sky. Our data is obtained as part of the PAndAS survey and enables us to confirm that Andromeda XXVII's heliocentric distance is 827 ± 47 kpc and spectroscopic metallicity is -2.1^{+0.4}_{-0.5}. We also re-derive Andromeda XXVII's kinematic properties, measuring a systemic velocity = -526.1^{+10.0}_{-11.0} kms^-1 and a velocity dispersion that we find to be non-Gaussian but for which we derive a formal value of 27.0^{+2.2}_{-3.9} kms^-1. In the upper segment of the North West Stream we measure mean values for the metallicity = -1.8±0.4, systemic velocity = -519.4 ±4.0 kms^-1 and velocity dispersion = 10.0±4.0 kms^-1. We also detect a velocity gradient of 1.7±0.3 kms^-1 kpc^-1 on an infall trajectory towards M31. With a similar gradient, acting in the same direction, in the lower segment we suggest that the North West Stream is not a single structure. As the properties of the upper segment of the North West Stream and Andromeda XXVII are consistent within 90% confidence limits, it is likely that the two are related and plausible that Andromeda XXVII is the progenitor of this stream.