تقرير
Forward and Back: Kinematics of the Palomar 5 Tidal Tails
| العنوان: | Forward and Back: Kinematics of the Palomar 5 Tidal Tails |
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| المؤلفون: | Kuzma, Pete B., Ferguson, Annette M. N., Varri, Anna Lisa, Irwin, Michael J., Bernard, Edouard J., Tolstoy, Eline, Peñarrubia, Jorge, Zucker, Daniel B. |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | The tidal tails of Palomar 5 (Pal 5) have been the focus of many spectroscopic studies in an attempt to identify individual stars lying along the stream and characterise their kinematics. The well-studied trailing tail has been explored out to a distance of 15^\text{o} from the cluster centre, while less than four degrees have been examined along the leading tail. In this paper, we present results of a spectroscopic study of two fields along the leading tail that we have observed with the AAOmega spectrograph on the Anglo-Australian telescope. One of these fields lies roughly 7^\text{o} along the leading tail, beyond what has been previously been explored spectroscopically. Combining our measurements of kinematics and line strengths with Pan-STARRS1 photometric data and Gaia EDR3 astrometry, we adopt a probabilistic approach to identify 16 stars with high probability of belonging to the Pal 5 stream. Eight of these stars lie in the outermost field and their sky positions confirm the presence of ``fanning'' in the leading arm. We also revisit previously-published radial velocity studies and incorporate Gaia EDR3 astrometry to remove interloping field stars. With a final sample of 109 {\it bona fide} Pal 5 cluster and tidal stream stars, we characterise the 3D kinematics along the the full extent of the system. We provide this catalogue for future modeling work. Comment: 13 pages, 8 figures, accepted for publication in MNRAS. The extended version of Table 4 is available as an ancillery file, and will be supplementary material in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stac381 |
| الوصول الحر: | http://arxiv.org/abs/2202.04548Test |
| رقم الانضمام: | edsarx.2202.04548 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stac381 |
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