NASA's James Webb Space Telescope voyages into the extreme starburst galaxy Messier 82 (M82), situated 12 million light-years away in the constellation Ursa Major.
Despite its relatively modest dimensions, M82 boasts a star formation rate exceeding that of our own Milky Way galaxy by a factor of ten, according to NASA.
Prototypical Starburst Galaxy
Under the guidance of Alberto Bolatto from the University of Maryland, College Park, a team of astronomers utilized NASA's James Webb Space Telescope, specifically its Near-Infrared Camera (NIRCam), to explore the intricacies of star formation within M82.
"M82 has garnered a variety of observations over the years because it can be considered as the prototypical starburst galaxy," said Bolatto, lead author of the study. "Both NASA's Spitzer and Hubble space telescopes have observed this target. With Webb's size and resolution, we can look at this star-forming galaxy and see all of this beautiful, new detail."
Webb's advanced capabilities allowed the researchers to delve deeper into M82's star-forming regions, revealing a wealth of new detail.
Star formation processes often remain veiled in cosmic mysteries, hidden behind dense curtains of dust and gas. However, Webb's proficiency in detecting infrared radiation proved instrumental in penetrating these cosmic veils.
By utilizing NIRCam's specialized imaging mode, the team managed to capture detailed snapshots of M82's central regions, overcoming the challenges posed by the galaxy's intense luminosity.
Despite the prevalence of dark dust lanes, indicative of ongoing star formation activity, Webb's observations provided unprecedented clarity. Each discernible speck in the images represents either a solitary star or a densely packed star cluster, enabling astronomers to conduct a comprehensive census of stellar populations within M82.
Read Also : NASA's James Webb Space Telescope Takes a Look at the Mysterious Cosmic Tendrils of NGC 604
Towering Tendrils of Gas
Extending their observations to longer infrared wavelengths, the astronomers uncovered a remarkable phenomenon - towering tendrils of gas extending above and below the galaxy's plane. These gaseous streamers, known as galactic winds, emanate from the starburst's core, shaping the surrounding interstellar environment.
A central focus of the research was deciphering the intricate dynamics of these galactic winds, driven by the rapid rate of star formation and subsequent supernovae.
By scrutinizing a central section of M82, scientists aimed to understand the origins of the galactic wind and its interactions with the surrounding environment.
Webb's NIRCam instrument was instrumental in tracing the structure of the galactic wind, particularly through the emission from sooty chemical molecules known as polycyclic aromatic hydrocarbons (PAHs).
Surprisingly, the PAH emission exhibited a fine structure resembling that of hot, ionized gas, challenging existing theories and highlighting the need for further investigation.
"Webb's observation of M82, a target closer to us, is a reminder that the telescope excels at studying galaxies at all distances," said Bolatto. "In addition to looking at young, high-redshift galaxies, we can look at targets closer to home to gather insight into the processes that are happening here - events that also occurred in the early universe."
The findings of the study have been published in The Astrophysical Journal.
Related Article: NASA's Picture of the Day Unveils What a Spiral Galaxy Looks Like in the Eyes of Webb and Hubble
