Discovery of Tidal Tails Around the Distant Globular Cluster Palomar 14

Bibcode
2011ApJ...726...47S
DOI
10.1088/0004-637X/726/1/47
Sollima, A.; Martínez-Delgado, D.; Valls-Gabaud, D.; Peñarrubia, J.
Bibliographical reference

The Astrophysical Journal, Volume 726, Issue 1, article id. 47 (2011).

Advertised on:
1
2011
Journal
The Astrophysical Journal
Number of authors
4
IAC number of authors
2
Citations
71
Refereed citations
62
Description
We report the detection of a pair of degree-long tidal tails associated with the globular cluster Palomar 14, using images obtained at the Canada-France-Hawaii Telescope. We reveal a power-law departure from a King profile at large distances to the cluster center. The density map constructed with the optimal matched filter technique shows a nearly symmetrical and elongated distribution of stars on both sides of the cluster, forming an S-shape characteristic of mass loss. This evidence may be the telltale signature of tidal stripping in action. This, together with its large Galactocentric distance, imposes strong constraints on its orbit and/or origin: (1) it must follow an external orbit confined to the peripheral region of the Galactic halo and/or (2) it formed in a satellite galaxy later accreted by the Milky Way.
Related projects
Group members
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology

We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.

Ignacio
Martín Navarro
In progress
Type
Refereed
Methods
Techniques

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