The Pristine survey - XVI. The metallicity of 26 stellar streams around the Milky Way detected with the STREAMFINDER in Gaia EDR3

We use the photometric metallicities provided by the panoramic Pristine survey to study the veracity and derive the metallicities of the numerous stellar streams found by the application of the STREAMFINDER algorithm to the Gaia Early Data Release 3 data. All 26 streams present in Pristine show a clear metallicity distribution function, which provides an independent check of the reality of these structures, supporting the reliability of STREAMFINDER in finding streams and the power of Pristine to measure precise metallicities. We further present six candidate structures with coherent phase-space and metallicity signals that are very likely streams. The majority of studied streams are very metal-poor (14 structures with [Fe/H] < −2.0) and include three systems with [Fe/H] < −2.9 (C-11, C-19, and C-20). These streams could be the closest debris of low-luminosity dwarf galaxies or may have originated from globular clusters of significantly lower metallicity than any known current Milky Way globular cluster. Our study shows that the promise of the Gaia data for Galactic Archeology studies can be substantially strengthened by quality photometric metallicities, allowing us to peer back into the earliest epochs of the formation of our Galaxy and its stellar halo constituents.

Ibata, Rodrigo A. (author)
Starkenburg, Else (author)
Yuan, Zhen (author)
Malhan, KhyatiStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)khma4881 (author)
Bellazzini, Michele (author)
Viswanathan, Akshara (author)
Aguado, David (author)
Arentsen, Anke (author)
Bonifacio, Piercarlo (author)
Carlberg, Ray (author)
González Hernández, Jonay I. (author)
Hill, Vanessa (author)
Jablonka, Pascale (author)
Kordopatis, Georges (author)
Lardo, Carmela (author)
McConnachie, Alan W. (author)
Navarro, Julio (author)
Sánchez-Janssen, Rubén (author)
Sestito, Federico (author)
Thomas, Guillaume F. (author)
Venn, Kim A. (author)
Vitali, Sara (author)
Voggel, Karina T. (author)
Stockholms universitetFysikum (creator_code:org_t)

In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)516:4, s. 5331-53540035-87111365-2966

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.