Rho Ophiuchi cloud
| Dark cloud | |
|---|---|
| Rho Ophiuchi cloud | |
|
|
| Infrared image of the Rho Ophiuchi cloud using the Wide-Field Infrared Survey Explorer | |
| Constellation | Snake bearer |
|
Position equinox : J2000.0 |
|
| Right ascension | 16h 28m 06s |
| declination | −24 ° 32 ′ 30 ″ |
| Further data | |
| Dimensions | 3000 M ☉ |
| history | |
| Catalog names | |
| IC 4604 • | |
| Aladin previewer | |
The Rho Ophiuchi Cloud or Rho Ophiuchi Nebula is a dark cloud about 1 ° south of the star ρ Ophiuchi in the constellation Snake Bearer . At 131 ± 3 parsecs (427 light years) away, this cloud is one of the closest star formation regions .
The Rho Ophiuchi Cloud covers a sky area of 4.5 ° × 6.5 ° . It consists of two large regions of dense gas and dust. The first region comprises the star formation region L1688 and the two filaments L1709 and L1755. The second region consists of the star formation region L1689 and the filaments L1712 – L1729. These filaments extend over 10–17.5 parsecs, but some are only 0.24 parsecs wide. Some structures appear to be the result of a shock wave that the cloud passed through from the direction of the nearby Scorpius-Centaurus Association .
The temperatures in the cloud are around 13-22 K. Their total mass is around 3,000 solar masses . Half of this mass is concentrated in region L1688, which is also the most active star formation region. In this area 425 infrared sources were detected, which are believed to be stars in the making. Of these infrared sources, 16 were recognized as protostars and 200 as T-Tauri stars between 100,000 and 1,000,000 years old.
Web links
- Spektrum.de : Collection of amateur recordings , labeled environment record
- Detailed photo of the Rho Ophiuchi region and its immediate surroundings.
Individual evidence
- ^ Simbad Query Result. Retrieved August 8, 2016 .
- ^ A b S. Bontemps et al .: ISOCAM observations of the rho Ophiuchi cloud: Luminosity and mass functions of the pre-main sequence embedded cluster . In: Astronomy and Astrophysics . 372, June 2001, pp. 173-194. arxiv : astro-ph / 0103373 . bibcode : 2001A & A ... 372..173B . doi : 10.1051 / 0004-6361: 20010474 .
- ↑ EE Mamajek: On the distance to the Ophiuchus star-forming region . In: Astronomical News . 329, 2008, pp. 10-14. arxiv : 0709.0505 . bibcode : 2008AN .... 329 ... 10M . doi : 10.1002 / asna.200710827 .
- ↑ Young Stars in Their Baby Blanket of Dust . In: Spitzer Multimedia Features . NASA. November 2, 2008. Retrieved October 24, 2009.
- ^ A b Robert B. Loren: The cobwebs of Ophiuchus. I - Strands of (C-13) O - The mass distribution . In: Astrophysical Journal, Part 1 . 338, March 15, 1989, pp. 902-924. bibcode : 1989ApJ ... 338..902L . doi : 10.1086 / 167244 .
- ^ BA Wilking, CJ Lada: The discovery of new embedded sources in the centrally condensed core of the Rho Ophiuchi dark cloud - The formation of a bound cluster . In: Astrophysical Journal, Part 1 . 274, Nov. 15, 1983, pp. 698-716. bibcode : 1983ApJ ... 274..698W . doi : 10.1086 / 161482 .
- ^ KL Luhman, GH Rieke: Low-Mass Star Formation and the Initial Mass Function in the ρ Ophiuchi Cloud Core . In: The Astrophysical Journal . 525, No. 1, November 1999, pp. 440-465. arxiv : astro-ph / 9905286 . bibcode : 1999ApJ ... 525..440L . doi : 10.1086 / 307891 .