File:Mysterious X-ray Signal Intrigues Astronomers (19030861216).jpg

Original file ‎(3,600 × 3,600 pixels, file size: 3.65 MB, MIME type: image/jpeg)

Captions

English

Add a one-line explanation of what this file represents

Description	English: A new study of the Perseus galaxy cluster, shown in this image, and others using Chandra and XMM-Newton has revealed a mysterious X-ray signal in the data. The signal is also seen in over 70 other galaxy clusters using XMM-Newton. This unidentified X-ray emission line - a spike of intensity centered on about 3.56 kiloelectron volts - requires further investigation to confirm both the signal's existence and nature. One possibility is this signal is from the decay of sterile neutrinos, one proposed candidate to explain dark matter.
Date	24 June 2014 (released)
Source	http://chandra.harvard.edu/photo/2014/perseus/more.html (TIFF source)
Author	NASA/CXC/SAO/E.Bulbul, et al.

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

Annotations

This image is annotated: View the annotations at Commons

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:21, 2 July 2017		3,600 × 3,600 (3.65 MB)	Huntster (talk \| contribs)	Less compressed version from Chandra site.
	20:49, 18 August 2016		3,600 × 3,600 (811 KB)	Vanished Account Byeznhpyxeuztibuo (talk \| contribs)	Transferred from Flickr via Flickr2Commons

You cannot overwrite this file.

The following page uses this file: