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NASA’s Hubble Space Telescope reveals a spiral galaxy with ‘forbidden’ light.


This captivating image showcases the whirling splendor of MCG-01-24-014, a luminous spiral galaxy situated approximately 275 million light-years away from Earth. Beyond its distinct spiral structure, MCG-01-24-014 boasts an exceptionally dynamic core classified as an active galactic nucleus (AGN), placing it in the category of a Type-2 Seyfert galaxy. Seyfert galaxies, akin to quasars, host one of the prevalent subclasses of AGNs. In the nuanced realm of AGN classification, Seyfert galaxies like MCG-01-24-014 are characterized by their relative proximity, with the central AGN not overpowering its host, in contrast to quasars that exhibit extraordinary luminosities and reside at vast distances, outshining their host galaxies.

Within the realm of Seyfert galaxies and quasars, there exist further subclasses, adding layers of complexity to our understanding of these celestial phenomena. In the case of Seyfert galaxies, astronomers delineate between Type-1 and Type-2 based on their distinctive spectra—the intricate patterns formed when light is dissected into its constituent wavelengths. Type-2 Seyfert galaxies, like MCG-01-24-014, emit spectral lines associated with specific ‘forbidden’ emission lines. To comprehend why certain emitted light is deemed forbidden, one must delve into the nature of spectra.

Spectra exhibit unique patterns because particular atoms and molecules absorb and emit light at precise wavelengths. This phenomenon is rooted in quantum physics, where electrons, tiny particles orbiting the nuclei of atoms and molecules, can only exist at specific energy levels. Consequently, electrons can only lose or gain energy in quantized amounts, aligning with the specific wavelengths of light that are either absorbed or emitted—a fundamental principle shaping the intricate tapestry of cosmic spectra.

The concept of forbidden emission lines, deemed implausible according to certain principles of quantum physics, introduces a fascinating paradox. Quantum physics, a realm of complexity, relies on rules formulated under controlled laboratory conditions on Earth. Within this framework, certain emissions are considered ‘forbidden,’ indicating their extreme improbability to the point of being dismissed. However, the cosmic stage, particularly within the intense energy of a galactic core, defies these Earth-bound assumptions.

In the cosmic expanse, where the rules of quantum physics face unique challenges, the so-called ‘forbidden’ light finds an opportunity to defy expectations and radiate its brilliance toward us, unveiling the intricacies of celestial processes beyond the confines of terrestrial laboratories.

Surendra Uikey

My name is Surendra Uikey, I am a science blogger, I have been blogging for the past three years, because I love to write, especially on astronomy, and I believe, if you want to learn something, then start learning others, By this it will be, that you learn things in a better way. In 2019, I started, the aim of making was to connect astronomy in simple words to common people.

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