From the Fire: A Deeper Look at the Phoenix Stream

Tavangar, K.; Ferguson, P.; Shipp, N.; Drlica-Wagner, A.; Koposov, S.; Erkal, D.; Balbinot, E.; Garcia-Bellido, J.; Kuehn, K.; Lewis, G. F.; Li, T. S.; Mau, S.; Pace, A. B.; Riley, A. H.; Abbott, T. M. C.; Aguena, M.; Allam, S.; Andrade-Oliveira, F.; Annis, J.; Bertin, E.; Brooks, D.; Burke, D. L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Constanzi, M.; da Costa, L. N.; Pereira, M. E. S.; De Vicente, J.; Diehl, H. T.; Everett, S.; Ferrero, I.; Flaugher, B.; Frieman, J.; Gaztanaga, E.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; James, D. J.; Kuropatkin, N.; Maia, M. A. G.; Marshall, J. L.; Menanteau, F.; Miquel, R.; Morgan, R.; Ogando, R. L. C.; Palmese, A.; Paz-Chinchon, F.; Pieres, A.; Malagon, A. A. Plazas; Rodriguez-Monroy, M.; Sanchez, E.; Scarpine, V.; Serrano, S.; Sevilla-Noarbe, I.; Smith, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; To, C.; Varga, T. N. und Walker, A. R. (2022): From the Fire: A Deeper Look at the Phoenix Stream. In: Astrophysical Journal, Bd. 925, Nr. 2, 118

Abstract

We use 6 yr of data from the Dark Energy Survey to perform a detailed photometric characterization of the Phoenix stellar stream, a 15 degrees long, thin, dynamically cold, low-metallicity stellar system in the Southern Hemisphere. We use natural splines, a nonparametric modeling technique, to simultaneously fit the stream track, width, and linear density. This updated stream model allows us to improve measurements of the heliocentric distance (17.4 +/- 0.1 (stat.) +/- 0.8 (sys.) kpc) and distance gradient (-0.009 +/- 0.006 kpc deg(-1)) of Phoenix, which corresponds to a small change of 0.13 +/- 0.09 kpc in heliocentric distance along the length of the stream. We measure linear intensity variations on degree scales, as well as deviations in the stream track on similar to 2 degrees scales, suggesting that the stream may have been disturbed during its formation and/or evolution. We recover three peaks and one gap in linear intensity along with fluctuations in the stream track. Compared to other thin streams, the Phoenix stream shows more fluctuations and, consequently, the study of Phoenix offers a unique perspective on gravitational perturbations of stellar streams. We discuss possible sources of perturbations to Phoenix, including baryonic structures in the Galaxy and dark matter subhalos.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0004-637X
• Sprache: Englisch