Thursday, October 3, 2019

APOD - The Hydrogen Clouds of M33

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2019 October 3
See Explanation.  Clicking on the picture will download  the highest resolution version available.

The Hydrogen Clouds of M33
Image Data: Subaru Telescope (NAOJ), Hubble Space Telescope - Image Processing: Robert Gendler
Additional Data: BYU, Robert Gendler, Johannes Schedler, Adam Block - Copyright: Robert Gendler, Subaru Telescope, NAOJ

Explanation: Gorgeous spiral galaxy M33 seems to have more than its fair share of glowing hydrogen gas. A prominent member of the local group of galaxies, M33 is also known as the Triangulum Galaxy and lies a mere 3 million light-years away. The galaxy's inner 30,000 light-years or so are shown in this magnificent 25 panel telescopic mosaic. Based on image data from space and ground-based telescopes, the portrait of M33 shows off the galaxy's reddish ionized hydrogen clouds or HII regions. Sprawling along loose spiral arms that wind toward the core, M33's giant HII regions are some of the largest known stellar nurseries, sites of the formation of short-lived but very massive stars. Intense ultraviolet radiation from the luminous, massive stars ionizes the surrounding hydrogen gas and ultimately produces the characteristic red glow. To enhance this image, broadband data was used to produce a color view of the galaxy and combined with narrowband data recorded through a hydrogen-alpha filter. That filter transmits the light of the strongest visible hydrogen emission line.

Tomorrow's picture: pixels in space


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