|| M51: From Across 27 Million Light-Years Away From Mother Earth in the Constellation Canes Venatici Galaxy M51 Presents a Feast for the Human Vision ||

|| Tuesday: September 05: 2023 || ά. The graceful winding arms of the grand-design spiral galaxy M51 stretch across this image from the NASA:ESA:CSA James Webb Space Telescope. Unlike the menagerie of weird and wonderful spiral galaxies with ragged or disrupted spiral arms, grand-design spiral galaxies boast prominent, well-developed spiral arms like the ones showcased in this image. This galactic portrait is a composite image, that integrates data from Webb’s Near-InfraRed Camera :NIRCam and Mid-InfraRed Instrument:MIRI.

In this image the dark red regions trace the filamentary warm dust permeating the medium of the galaxy. The red regions show the reprocessed light from complex molecules forming on dust grains, while colours of orange and yellow show the regions of ionised gas by the recently formed star clusters. Stellar feedback has a dramatic effect on the medium of the galaxy and create complex network of bright knots, as well as, cavernous black bubbles.

M51, also known as, NGC 5194, lies about 27 million light-years away from Earth in the constellation Canes Venatici, and is trapped in a tumultuous relationship with its near neighbour, the dwarf galaxy NGC 5195. The interaction between these two galaxies has made these galactic neighbours one of the better-studied galaxy pairs in the night sky. The gravitational influence of M51’s smaller companion is thought to be partially responsible for the stately nature of the galaxy’s prominent and distinct spiral arms.

This Webb observation of M51 is one of a series of observations, collectively titled, Feedback in Emerging extrAgalactic Star clusTers or FEAST. The FEAST observations were designed to shed light on the interplay between stellar feedback and star formation in environments outside of our own galaxy, the Milky Way. Stellar feedback is the term used to describe the outpouring of energy from stars into the environments, which form them, and is a crucial process in determining the rates at which stars form. Understanding stellar feedback is vital to building accurate universal models of star formation.

The aim of the FEAST observations is to discover and study stellar nurseries in galaxies beyond our own Milky Way. Before Webb became operative, other observatories, such as, the Atacama Large Millimetre Array in the Chilean desert and Hubble have given us a glimpse of star formation either at the onset, tracing the dense gas and dust clouds where stars will form, or after the stars have destroyed with their energy their natal gas and dust clouds. Webb is opening a new window into the early stages of star formation and stellar light, as well as, the energy reprocessing of gas and dust. Scientists are seeing star clusters emerging from their natal cloud in galaxies beyond our local group for the first time.

They will, also, be able to measure how long it takes for these stars to pollute with newly formed metals and to clean out the gas. These time scales are different from galaxy to galaxy. By studying these processes, we will better understand how the star formation cycle and metal enrichment are regulated within galaxies, as well as, what are the time scales for planets and brown dwarfs to form. Once dust and gas are removed from the newly formed stars, there is no material left to form planets.

Caption: A large spiral galaxy takes up the entirety of the image. The core is mostly bright white but, there are, also, swirling, detailed structures, that resemble water circling a drain. There is white and pale blue light, that emanates from stars and dust at the core’s centre but, it is tightly limited to the core. The rings feature colours of deep red and orange and highlight filaments of dust around cavernous black bubbles: Image: ESA:Webb, NASA:CSA:A. Adamo:Stockholm University:The FEAST JWST team :::ω:::

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