| Emission nebula | |
|---|---|
| H II region | |
 RCW 145 | |
| Observation data: J2000 epoch | |
| Right ascension | 18h 02m 18s |
| Declination | −23° 30′ 56″ [1] |
| Distance | 2500 [2] pc |
| Apparent dimensions (V) | 1.59° x 1.17° |
| Constellation | Sagittarius |
| 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. [3] It is ionized by the supergiant stars LS 4551 and LS 4538. [4] It is possible it is associated with the Trifid nebula. [5]
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. [6]
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. [7] 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. [8]
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