File:Messier 74 ULX.jpg
Messier_74_ULX.jpg (420 × 420 pixels, file size: 224 KB, MIME type: image/jpeg)
Summary[edit | edit source]
This is a composite image (X-ray - red, optical - blue & white) of the spiral galaxy M74 with an ultraluminous X-ray source (ULX) indicated inside the box. Image is 9 arcmin per side at RA 01h 36m 41.70s Dec +15° 46' 59.0" in Pisces. Observation dates: June 19, 2001; October 19, 2001. Aka: NGC 628, ULX: CXOU J013651.1+154547.
Licensing[edit | edit source]
| Description |
This is a composite image (X-ray - red, optical - blue & white) of the spiral galaxy M74 with an ultraluminous X-ray source (ULX) indicated inside the box. Image is 9 arcmin per side at RA 01h 36m 41.70s Dec +15° 46' 59.0" in Pisces. Observation dates: June 19, 2001; October 19, 2001. Aka: NGC 628, ULX: CXOU J013651.1+154547. |
|---|---|
| Source |
An "Astronomy Picture of the Day" at url=http://apod.nasa.gov/apod/ap050330.html which is a composite of an X-ray image from CXC overlain on an optical image from NOAO. |
| Date |
March 30, 2005. |
| Author |
X-ray; J. Liu (U.Mich.) et al., CXC, NASA - Optical; Todd Boroson/NOAO/AURA/NSF. |
| Rationale |
No free licensed or public domain alternatives known to exist to show the optical portion - blue & white of the spiral galaxy M74 with an ultraluminous X-ray source (ULX) indicated inside the box, about 2001, with permission. |
| Permission |
The NASA portion is Public Domain, Kathie Coil, Public Affairs Program Coordinator, NOAO, stated in an email: "You may use the image/data at no charge. The original image is located at http://www.noao.edu/image_gallery/html/im0509.html just in case you need better resolution. We would appreciate it if you would include the credit for the optical portion as Todd Boroson/NOAO/AURA/NSF." Copy of email exchange available upon request from Wikiversity User:Marshallsumter to verify or upgrade license. NOAO/AURA Conditions of Use. |
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The image is non-free fair use in X-ray astronomy.
The image is non-free with permission.
Fair use for X-ray astronomy[edit | edit source]
The image linked here is claimed to be used under fair use as:
- it is a scientifically significant photo of an X-ray astronomy phenomenon;
- it is of much lower resolution than the original (copies made from it will be of very inferior quality)
- the photo is only being used for informational/educational purposes.
- Its inclusion in the article adds significantly to the article because it shows the phenomenon depicted in this article and how it has a significant impact on galactic X-ray astronomy to the general public.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:04, 21 November 2012 | | 420 × 420 (224 KB) | Marshallsumter (discuss | contribs) | This is a composite image (X-ray - red, optical - blue & white) of the spiral galaxy M74 with an ultraluminous X-ray source (ULX) indicated inside the box. Image is 9 arcmin per side at RA 01h 36m 41.70s Dec +15° 46' 59.0" in Pisces. Observation dates... |
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- Observatories/Astronomy
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- User:Marshallsumter/Radiation astronomy2/X-rays
- Portal:Radiation astronomy/Image
- Portal:Radiation astronomy/Image/17
- Portal:Radiation astronomy/X-ray astronomy article
- Portal:Radiation astronomy/X-ray astronomy article/12
