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Key sections: "The researchers discovered HD1 in data collected over 1,200 hours of observation time using the Subaru Telescope, the VISTA Telescope, the U.K.
by SkyMarshal 5y ago
Key sections:
"The researchers discovered HD1 in data collected over 1,200 hours of observation time using the Subaru Telescope, the VISTA Telescope, the U.K. Infrared Telescope and the Spitzer Space Telescope. They were particularly looking at redshift, a phenomenon in which light waves stretch out or become redder as an object moves away from the observer. In this case, the redshift suggested HD1 was extremely distant.
The researchers found that the red wavelengths were the equivalent to a galaxy located 13.5 billion light-years away.
HD1 also seems to be growing at a feverish rate — about 100 stars each year, or at least 10 times the rate predicted for starburst galaxies that are known to produce stars at an extraordinarily high pace.
These stars were also more massive, brighter (in ultraviolet wavelengths) and hotter than younger stars, the researchers found.
As such, HD1 could be home to the universe's very first stars, called Population III stars; if that identity is verified, this would be the first observation of this type of star, the researchers said. There's also the possibility that HD1 is a supermassive black hole with a mass of about 100 million times that of the sun."
Also a paper on it: https://arxiv.org/abs/2201.00823 https://arxiv.org/abs/2201.00823
- thanatos519 5y agoI can't wait for JWST to look over there!
- 8bitsrule 5y agoPaper sez: z ∼ 13
- BurningFrog 5y agoHow do they count the number of new stars? I mean, it's way too far away to see individual stars.
- keithnz 5y agono, due to gravitational lensing, you can see stars. For a straightforward break down, see Dr Becky, https://www.youtube.com/watch?v=VChgsXbIgdw https://www.youtube.com/watch?v=VChgsXbIgdw
- simonh 5y agoOh grief, I've tried getting into her channel a few times because the content and analysis is fantastic, but the 'effervescent' delivery style is excruciating.
- devoutsalsa 5y agoWhat’s your email address? I’ll send you my toenail moon images.
- stevenrj 5y agoThis galaxy is not being gravitationally lensed though.
- stevenrj 5y agoWe have models for how much light a star of a given mass, age, chemical composition etc. puts out as a function of wavelength. We can then take mixtures of stars and predict the total light output of a stellar population in different bandpasses. So from observations of a galaxy in these different bandpasses, we can use these models to determine things like the age of the stars in the galaxy—from how old the stars in the best fit stellar population are—as well as the mass (or number) of stars—from how many are needed to match the observed brightness of the galaxy.
- BurningFrog 5y agoThat makes sense. Thanks!