RCW 145
| Emission nebula | |
|---|---|
| H II region | |
.png?lang=en) RCW 145 | |
| Observation data: J2000 epoch | |
| Right ascension | 18h 02m 18s |
| Declination | −23° 30′ 56″[1] |
| Distance | 8480[2] ly (2500 [3] pc) |
| Apparent magnitude (V) | 16.8[4] |
| Apparent dimensions (V) | 1.59° x 1.17° |
| Constellation | Sagittarius |
| Physical characteristics | |
| Radius | 47 ly |
| Designations | NGC 6526, Sh 2-26, Sh 2-28, Gum 74 |
RCW 145 is an emission nebula in the constellation Sagittarius. RCW 145 contains both Sh 2-26 and Sh 2-28.[5] It is ionized by the supergiant stars LS 4551 and LS 4538.[6] It is possible it is associated with the Trifid nebula.[7]
Visibility
[edit]RCW 145 is often imaged alongside nearby the nebulae of the Lagoon Nebula and Trifid Nebula. The nebula responds well to Hydrogen-alpha filters. It is also easily visible with a Sulfur II filter, however is not very visible in an Oxygen III filter. It is difficult to image with standard RGB.[8]
W 28
[edit]In the direction of RCW 145 is also the supernova remnant SNR G006.4-00.1 (W28). W28 lies at a further distance of 1800 to 3300 parsecs. It contains multiple pockets of Maser activity. These pockets are 50-100 milliarcseconds in apparent size.[9] W 28 is visible in most wavelengths, from radio waves to gamma rays. There is some ionization caused by W 28. It was initially thought to be cause by x-ray emissions, however it has since been determined to be cause by cosmic ray emissions.[10]
References
[edit]- ^ "Sh2-28".
- ^ "Sharpless (Sh2) - Astrobasics". 13 September 2022.
- ^ Russeil, D. (2003). "Star-forming complexes and the spiral structure of our Galaxy". Astronomy and Astrophysics. 397: 133. Bibcode:2003A&A...397..133R. doi:10.1051/0004-6361:20021504.
- ^ "Sharpless (Sh2) - Astrobasics". 13 September 2022.
- ^ "Sh 2-26".
- ^ "Sh 2-28".
- ^ Giuliani, A.; et al. (2010). "AGILE detection of GeV γ-ray emission from the SNR W28". Astronomy and Astrophysics. 516. arXiv:1005.0784. Bibcode:2010A&A...516L..11G. doi:10.1051/0004-6361/201014256.
- ^ "SH2-28 (Sharpless 28)".
- ^ "Supernova Remnant W28 · NRAO/AUI Archives".
- ^ Phan, V. H. M.; Gabici, S.; Morlino, G.; Terrier, R.; Vink, J.; Krause, J.; Menu, M. (2020). "Constraining the cosmic ray spectrum in the vicinity of the supernova remnant W28: From sub-GeV to multi-TeV energies". Astronomy & Astrophysics. 635: A40. arXiv:1910.09987. Bibcode:2020A&A...635A..40P. doi:10.1051/0004-6361/201936927.
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