H2020Индивидуална стипендия2018–2020

PERSEUS · A New Perspective On Star Formation and Spiral Structure in Our Home Galaxy

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2018-05-01 → 2020-04-30
Финансиране от ЕС: 183 455 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Гигантските молекулярни облаци в спиралното рамо Персей се анализират, за да се създаде карта на външната част на Млечния път. Това помага да се разберат физическите условия при формирането на звездите и как те варират в различните части на галактиката.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

A New Perspective On Star Formation and Spiral Structure in Our Home Galaxy

Giant molecular clouds (GMCs) are the principal sites of star formation. The increasing resolution and sensitivities of interferometers such as ALMA and NOEMA allows us now to resolve GMCs in nearby galaxies and expansions of these (sub)millimetre capabilities will enable sampling of smaller scales at larger distances over the next decade. However, the derivation of cloud properties are complicated by their large spread in distance along the line of sight. Consequently, one would compare parsec-sized clouds of a few hundred solar masses in the solar neighbourhood to the largest, million-solar-mass GMCs in the distant Milky Way or even in nearby galaxies. Another problem that prevents us from clearly setting the Milky Way within the context provided by other galaxies is that our Galaxy is observed from within, meaning without the clean perspective of an external observer. While in the inner parts of our Galaxy, within the solar circle, two distances are geometrically possible for any line-of-sight velocity and a clean separation of spiral arms is difficult, our project focuses on the outer Galaxy, where the distance is unique. The main goal of the project is to produce the first map of the Perseus spiral arm in our outer Galaxy as would be seen by an external observer at fixed spatial resolution. The Perseus arm extends over one third of the Milky Way's observed span and covers different environmental conditions. 12CO data of the spiral arm are convolved to the same spatial resolution and regridded onto maps of constant linear scale. From these Perseus spiral arm maps a fundamental benchmark sample of GMCs is extracted using a cloud-finding algorithm to determine their physical conditions and for comparison with GMCs in the inner Galaxy to study the impact of different kinds of environments. The first common resolution map of the Perseus arm is reprojected to any desired spatial resolution, to match observations of nearby galaxies and to provide a tool for comparison with extragalactic surveys.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Giant molecular clouds (GMCs) are the principal sites of star formation. The derivation of cloud properties are complicated by their large spread in distance along the line of sight. Consequently, to gain insight into the GMCs' physical states one compares parsec-sized clouds of a few hundred solar masses in the solar neighbourhood to the largest, million-solar-mass GMCs in the distant Milky Way. The main goal of my project is to produce the first map of the Perseus Spiral Arm in our outer Galaxy as would be seen by an external observer at fixed spatial resolution. The Perseus Arm extends over one third of the Milky Way's observed span and covers different environmental conditions. HI, 12CO and 13CO data of the Perseus Arm will be convolved to the same spatial resolution and regridded onto maps of constant linear scale. I will extract a fundamental benchmark sample of GMCs using cloud-finding algorithms for comparison with GMCs in the inner Galaxy to study the impact of different kinds of environments. I will reproject the Perseus Arm maps to any desired spatial resolution, to match and compare with observations of nearby galaxies. The phase balance between the atomic and molecular gas, the clump and star formation efficiency will be derived to investigate the relation between spiral arms and star formation.This first common resolution study of the Milky Way's GMCs will be of benefit for the galactic and extragalactic community and allow me to broaden my expertise and skills in the inner Galaxy to a new environment in the outer Galaxy. I will be able to expand my network through collaboration in the field and with colleagues from Exeter. My goal to place the Milky Way in the context of other galaxies with extragalactic collaboration will enable me to become one of the few experts in the field, which will help me to achieve my long-term goal to obtain a permanent academic position.

Оригинален текст от CORDIS (на английски).

Участници

THE UNIVERSITY OF EXETER · ExeterКоординаторОбединеното кралство