Sh 2-183
Coordinates: (123.2°, 2.83°)
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This is an apparently large and distant HII region that is obscured by foreground dust. It consists of 44 thousand solar masses of ionised gas and is at least 3.9 million years old. The stars ionising the gas are unknown and are probably obscured by the foreground dust.
Avedisova locates Sh 2-183 in star formation region SFR 123.20+2.83, with 16 components, including a water maser and 8 infrared sources. One of these infrared sources is the young stellar object IRAS 00468+6527.
This object shows an extended irregular structure at radio frequencies as this 2.7 GHz image taken with the Effelsberg 100m radio telescope reveals.
I've used IPHAS hydrogen-alpha data to create a black and white image of this highly obscured nebula here.
Sh 2-183 is visible as a diffuse nebula bordered by more compact emission sources in this IRAS infrared image.
If this object is really located at 7000 parsecs, then the size in the radio image suggests that it may be one of the largest star formation regions in the outer galaxy. Note, however, that streaming motions in the Perseus arm can result in exaggerated distance estimates if velocity data is used alone to determine an object's distance (and the current distance estimate is, indeed, based on gas velocity).
Avedisova locates Sh 2-183 in star formation region SFR 123.20+2.83, with 16 components, including a water maser and 8 infrared sources. One of these infrared sources is the young stellar object IRAS 00468+6527.
This object shows an extended irregular structure at radio frequencies as this 2.7 GHz image taken with the Effelsberg 100m radio telescope reveals.
I've used IPHAS hydrogen-alpha data to create a black and white image of this highly obscured nebula here.
Sh 2-183 is visible as a diffuse nebula bordered by more compact emission sources in this IRAS infrared image.
If this object is really located at 7000 parsecs, then the size in the radio image suggests that it may be one of the largest star formation regions in the outer galaxy. Note, however, that streaming motions in the Perseus arm can result in exaggerated distance estimates if velocity data is used alone to determine an object's distance (and the current distance estimate is, indeed, based on gas velocity).
This is a large HII region that is mostly obscured by foreground dust. It consists of 44 thousand solar masses of ionised gas and is at least 3.9 million years old. The star or stars ionising the gas is unknown and is probably obscured by the foreground dust. [1]
Notes
1. ^ Landecker, T. L., Anderson, M. D., Routledge, D., et al. (1992). "Sharpless 183 - an H II region in the Perseus arm", Astronomy and Astrophysics, Vol. 258, 495-506. [1992A&A...258..495L]
Distance estimates
7000 pc +/- 1500 [1992A&A...258..495L]Links
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Most of the sources used to create these nebula descriptions are listed in the
notes section for each description. In some cases,
for example the Avedisova, Humphreys and Reed catalogs, the source is used extensively and is not listed in the
individual nebula descriptions. See this catalog overview
for more information on the catalogs and the general sources used
to create these descriptions and this introduction to HII regions
on the general history of this area of astronomy.
This image was created using the POSS-II/UKSTU data of the Digitized Sky Survey and SuperCOSMOS using the process described here.
According to my correspondence with the Royal Observatory Edinburgh and the Space Telescope Science Institute, I am allowed to use the POSS-II/UKSTU data to create and display images for non-commercial purposes so long as I include this fine print for the SuperCOSMOS data:
Use of these images is courtesy of the UK Schmidt Telescope (copyright in which is owned by the Particle Physics and Astronomy Research Council of the UK and the Anglo-Australian Telescope Board) and the Southern Sky Survey as created by the SuperCOSMOS measuring machine and are reproduced here with permission from the Royal Observatory Edinburgh.
and this acknowledgement taken from the DSS site:
The Digitized Sky Surveys were produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions.
The Second Palomar Observatory Sky Survey (POSS-II) was made by the California Institute of Technology with funds from the National Science Foundation, the National Geographic Society, the Sloan Foundation, the Samuel Oschin Foundation, and the Eastman Kodak Corporation.
The UK Schmidt Telescope was operated by the Royal Observatory Edinburgh, with funding from the UK Science and Engineering Research Council (later the UK Particle Physics and Astronomy Research Council), until 1988 June, and thereafter by the Anglo-Australian Observatory. The blue plates of the southern Sky Atlas and its Equatorial Extension (together known as the SERC-J), as well as the Equatorial Red (ER), and the Second Epoch [red] Survey (SES) were all taken with the UK Schmidt.
The "Second Epoch Survey" of the southern sky was made by the Anglo-Australian Observatory (AAO) with the UK Schmidt Telescope. Plates from this survey have been digitized and compressed by the ST ScI. The digitized images are copyright ? 1993-5 by the Anglo-Australian Observatory Board, and are distributed herein by agreement.
The "Equatorial Red Atlas" of the southern sky was made with the UK Schmidt Telescope. Plates from this survey have been digitized and compressed by the ST ScI. The digitized images are copyright ? 1992-5, jointly by the UK SERC/PPARC (Particle Physics and Astronomy Research Council, formerly Science and Engineering Research Council) and the Anglo-Australian Telescope Board, and are distributed herein by agreement.
The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright ? 1993-1995 by the California Institute of Technology and are distributed herein by agreement. The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright ? 1993-1995 by the California Institute of Technology and are distributed herein by agreement.