NRAO: National Radio Astronomy Observatory

About this Image

The distribution of the cold neutral atomic hydrogen gas in the Scd galaxy Messier 33, also known as the "Triangulum Galaxy". Bright regions indicate regions with a high gas density, while dark regions have little or no gas. The underlying stellar disk of this galaxy is not shown, but appears elsewhere in the image gallery. This image emphasizes the wealth of structure present in the gas disk, from tight knots of gas associated with star forming regions, to large holes which may have been swept clean of gas by the winds from massive stars or by exploding supernovae.

Investigator(s):  David Thilker, Robert Braun, and Rene Walterbos

Alternate Resolutions

Help

This image is available in the following downloadable versions:

• 400 x 552 color JPEG
• 742 x 1024 color JPEG

If you would like to obtain a higher resolution version of this image, please contact Pat Smiley.

For More Information

• Read the Press Release
• Read the NRAO Newsletter article
• Visit related website http://images.nrao.edu/Galaxy/Spiral/51
• Up one level for more info on Spiral galaxies
• For unfamiliar terms, visit the NRAO Radio Astronomy Glossary

Technical Data

Telescope	ALMA
Date of Observation	1998-08-15
Type of Observation	Spectral Line Observations
Wavelength	21 cm
Frequency	1420.4 MHz
Species	HI
Center of Image	RA: 01:33:51.02, Dec: 30:39:36.70 (J2000)
Field of View	1.0000 x 1.0000 degrees
Technical Caption	The data were obtained from VLA observations taken both in its B-array and CS-array configurations, with a spatial resolution of 10" and velocity resolution of 1.3 km/s. The VLA data have been supplemented by total power observations obtained at the Westerbork Synthesis Radio Telescope.



Astronomical database entries for M33
• Query NED for images of M33
• Query SIMBAD for more M33 data

---

SEARCH THE IMAGE GALLERY To search the Image Gallery for other images of M33, click the Submit button. Object Name Show Results As: Thumbnails List To search the Image Gallery for similar images, click the Submit button. Category Sub-Category Telescope Mode Show Results As: Any Galaxy AGN Galactic_Sources Solar_System Miscellaneous Telescopes Historical Any Spiral Early-type Dwarf Peculiar Clusters Any GBT VLA VLBA ALMA 12 m 140 ft Any Continuum Spectral Line Thumbnails List For more search options, please use our Advanced Search form.