The Tomographic Ionized-carbon Mapping Experiment (TIME) is a groundbreaking tool that promises to revolutionize our understanding of the early universe. Mounted on a 12-meter radio telescope at Kitt Peak Observatory, TIME employs an innovative technique called line-intensity mapping (LIM) to gather light from numerous galaxies simultaneously. This approach allows scientists to study the cosmos in a way that was previously impossible, providing a fascinating glimpse into the goings-on in the very early universe.
What makes TIME particularly intriguing is its focus on the Epoch of Reionization (EoR), a critical period in the cosmos' history. During the EoR, the universe's first stars and galaxies ionized the intergalactic medium, transforming hydrogen from neutral to ionized and making the universe translucent. TIME aims to map carbon monoxide emission lines, which serve as a window into this pivotal phase.
The lead author, Selina Yang, a doctoral student at Cornell University, explains TIME's unique approach. Instead of isolating individual galaxies, TIME measures the combined glow from countless galaxies, akin to observing a city from a distance. This method enables the study of hydrogen gas distribution and star formation across time in the early universe.
Abigail Crites, an assistant professor of physics at Cornell and TIME's principal investigator, emphasizes the project's ambition. TIME aims to probe cosmic history over a range of times, providing a more comprehensive understanding of the early universe. While regular telescopes offer limited insights, TIME's ability to discern galaxies' presence and brightness, even in fuzzy patches, is groundbreaking.
The first preliminary results from TIME's commissioning run, published in The Astrophysical Journal, focus on Sagittarius A (Sgr A), the Milky Way's galactic center. These observations verify TIME's hyperspectral imaging capabilities and demonstrate its potential to measure molecular gas in Sgr A. The researchers compare TIME's results with previous observations, validating its effectiveness.
TIME's observations near the Milky Way's nucleus, including the Circumnuclear Disk (CND) and gas clouds, serve as stand-ins for early starburst galaxies. These regions are rich in emission bands, making them ideal for testing TIME's capabilities. The CMZ, a heavily observed region, provides a valuable opportunity to compare TIME's results with existing observations.
The authors express satisfaction with TIME's initial observations, highlighting its ability to acquire and process spectral maps under challenging conditions. Despite facing skepticism in its early days, TIME's maturation has overcome foreground contamination concerns, paving the way for upcoming extragalactic CO and [C ii] surveys.
In conclusion, TIME represents a significant advancement in our quest to understand the early universe. Its innovative approach and preliminary results demonstrate its potential to unlock new insights into the cosmos' history, offering a fascinating glimpse into the mysteries of the past.
