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Young stars raining through the galactic halo: the nature and orbit of price-whelan 1
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 62019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 490, no 2, p. 2588-2598Article in journal (Refereed) Published
Abstract [en]

We present radial velocities for five member stars of the recently discovered young (age similar or equal to 100-150 Myr) stellar system Price-Whelan 1 (PW1), which is located far away in the Galactic Halo (D similar or equal to 29 kpc, Z similar or equal to 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-r = 275 +/- 10 km s(-1), 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 HI 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 similar or equal to 25 km s(-1) and similar or equal to 10 deg similar or equal to 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.

Place, publisher, year, edition, pages
2019. Vol. 490, no 2, p. 2588-2598
Keywords [en]
stars: kinematics and dynamics, open clusters and associations: individual: Price-Whelan 1, galaxies: ISM, Magellanic Clouds
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-176672DOI: 10.1093/mnras/stz2788ISI: 000496926900083OAI: oai:DiVA.org:su-176672DiVA, id: diva2:1379410
Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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Malhan, KhyatiFamaey, Benoit
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