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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29591
Title: Young stars raining through the galactic halo: the nature and orbit of Price-Whelan 1
Authors: BELLAZZINI, Michele 
Ibata, Rodrigo A.
Martin, Nicolas
Malhan, Khyati
MARASCO, ANTONINO 
Famaey, Benoit
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 490
Issue: 2
First Page: 2588
Abstract: We present radial velocities for five member stars of the recently discovered young (age ≃ 100-150 Myr) stellar system Price-Whelan 1 (PW 1), which is located far away in the Galactic Halo (D≃ 29 kpc, Z≃ 15 kpc), and that is probably associated with the leading arm (LA) of the Magellanic Stream. We measure the systemic radial velocity of PW 1, V<SUB>r</SUB> = 275 ± 10 km s<SUP>-1</SUP>, significantly larger than the velocity of the LA gas in the same direction. We re-discuss the main properties and the origin of this system in the light of these new observations, computing the orbit of the system and comparing its velocity with that of the H I in its surroundings. We show that the bulk of the gas at the velocity of the stars is more than 10 deg (5 kpc) away from PW 1 and the velocity difference between the gas and the stars becomes larger as gas closer to the stars is considered. We discuss the possibilities that (1) the parent gas cloud was dissolved by the interaction with the Galactic gas, and (2) that the parent cloud is the high-velocity cloud (HVC) 287.5+22.5 + 240, lagging behind the stellar system by ≃ 25 km s<SUP>-1</SUP> and ≃10 deg ≃ 5 kpc. This HVC, which is part of the LA, has metallicity similar to PW 1, displays a strong magnetic field that should help to stabilize the cloud against ram pressure, and shows traces of molecular hydrogen. We also show that the system is constituted of three distinct pieces that do not differ only by position in the sky but also by stellar content.
URI: http://hdl.handle.net/20.500.12386/29591
URL: https://academic.oup.com/mnras/article/490/2/2588/5581515
ISSN: 0035-8711
DOI: 10.1093/mnras/stz2788
Bibcode ADS: 2019MNRAS.490.2588B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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1910.04899.pdfversione arXiv, identica all'originale2.93 MBAdobe PDFView/Open
PW1.pdfPDF editoriale5.1 MBAdobe PDFView/Open
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