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  From the fire: a deeper look at the Phoenix stream

Tavangar, K., Ferguson, P., Shipp, N., Drlica-Wagner, A., Koposov, S., Erkal, D., et al. (2022). From the fire: a deeper look at the Phoenix stream. The Astrophysical Journal, 925(2): 118. doi:10.3847/1538-4357/ac399b.

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Tavangar, K., Author
Ferguson, P., Author
Shipp, N., Author
Drlica-Wagner, A., Author
Koposov, S., Author
Erkal, D., Author
Balbinot, E., Author
García-Bellido, J., Author
Kuehn, K., Author
Lewis, G. F., Author
Li, T. S., Author
Mau, S., Author
Pace, A. B., Author
Riley, A. H., Author
Abbott, T. M. C., Author
Aguena, M., Author
Allam, S., Author
Andrade-Oliveira, F., Author
Annis, J., Author
Bertin, E., Author
Brooks, D., AuthorBurke, D. L., AuthorRosell, A. Carnero, AuthorKind, M. Carrasco, AuthorCarretero, J., AuthorCostanzi, M., Authorda Costa, L. N., AuthorPereira, M. E. S., AuthorVicente, J. De, AuthorDiehl, H. T., AuthorEverett, S., AuthorFerrero, I., AuthorFlaugher, B., AuthorFrieman, J., AuthorGaztanaga, E., AuthorGerdes, D. W., AuthorGruen, D., AuthorGruendl, R. A., AuthorGschwend, J., AuthorGutierrez, G., AuthorHinton, S. R., AuthorHollowood, D. L., AuthorHonscheid, K., AuthorJames, D. J., AuthorKuropatkin, N., AuthorMaia, M. A. G., AuthorMarshall, J. L., AuthorMenanteau, F., AuthorMiquel, R., AuthorMorgan, R., AuthorOgando, R. L. C., AuthorPalmese, A., AuthorPaz-Chinchón, F., AuthorPieres, A., AuthorMalagón, A. A. Plazas, AuthorRodriguez-Monroy, M., AuthorSanchez, E., AuthorScarpine, V., AuthorSerrano, S., AuthorSevilla-Noarbe, I., AuthorSmith, M., AuthorSuchyta, E., AuthorSwanson, M. E. C., AuthorTarle, G., AuthorTo, C., AuthorVarga, T. N.1, Author           Walker, A. R., Author more..
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 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° 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 ∼2° 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.

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 Dates: 2022-01-31
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ac399b
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 925 (2) Sequence Number: 118 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3