The interstellar medium: The key component in galactic evolution and modern cosmology

Date

2019

Authors

Heiles, Carl
Li, Di
McClure-Griffiths, Naomi
Qian, Lei
Liu, Shu

Journal Title

Journal ISSN

Volume Title

Publisher

American Institute of Physics

Abstract

The gases of the interstellar medium (ISM) possess orders of magnitude more mass than those of all the stars combined and are thus the prime component of the baryonic Universe. With L-band surface sensitivity even better than the planned phase one of the Square Kilometre Array (SKA1), the Five-hundred-meter Aperture Spherical radio Telescope (FAST) promises unprecedented insights into two of the primary components of ISM, namely, atomic hydrogen (HI) and the hydroxyl molecule (OH). Here, we discuss the evolving landscape of our understanding of ISM, particularly, its complex phases, the magnetic fields within, the so-called dark molecular gas (DMG), high velocity clouds and the connection between local and distant ISM. We lay out, in broad strokes, several expected FAST projects, including an all northern-sky high-resolution HI survey (22 000 deg2, 3' FWHM beam, 0.2 km s−1), targeted OH mapping, searching for absorption and maser signals, etc. Currently under commissioning, the commensal observing mode of FAST will be capable of simultaneously obtaining HI and pulsar data streams, making large-scale surveys in both science areas more efficient.

Description

Keywords

ISM: atoms, ISM: individual(hydrogen), ISM: molecules, ISM: evolution, surveys

Citation

Source

Research in Astronomy and Astrophysics

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1088/1674-4527/19/2/17

Restricted until

2099-12-31