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The radial abundance gradient of oxygen towards the Galactic anti-centre

Author/s: Esteban, C., Fang, X., García-Rojas, J., Toribio San Cipriano, L.

Reference: 2017 MNRAS 471 987 | Link

Sh2-298 or NGC2359, one of the nebulae whose spectrum has been analyzed in this work. Combination of images in the filters B (blue), R (green) and H-alpha (red) obtained with the Wide Field Camera of the Isaac Newton Telescope (INT) of the Isaac Newton Group of telescopes (ING) at the Roque de los Muchachos Observatory (Garafía, La Palma). Credit: Ángel R. López-Sánchez (AAO/MQU) and Sergio Simón-Díaz (IAC).
Sh2-298 or NGC2359, one of the nebulae whose spectrum has been analyzed in this work. Combination of images in the filters B (blue), R (green) and H-alpha (red) obtained with the Wide Field Camera of the Isaac Newton Telescope (INT) of the Isaac Newton Group of telescopes (ING) at the Roque de los Muchachos Observatory (Garafía, La Palma). Credit: Ángel R. López-Sánchez (AAO/MQU) and Sergio Simón-Díaz (IAC).

Using the OSIRIS spectrograph attached to the Gran Telescopio CANARIAS (GTC), it has been possible to determine -for the first time- the temperature and oxygen abundance of several nebulae (HII regions) located in the outer zones of the disc of the Milky Way. The results show that the radial distribution of the amount of oxygen does not show a flattening in this zone, something that was not clear and that several previous studies suggested. The observed behavior indicates that the mechanisms that produce the star formation and the chemical evolution of the gas are similar along the disc of the Galaxy and discard the existence of exotic phenomena in the outer zones. The results imply that the most accepted models for the formation and evolution of the Milky Way, such as the so-called inside-out models, can be applied to at least most of the Galactic disk.

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