*: Name generated from J coordinates
?: Probable, believed to be so, but has not been confirmed
??: Possible, has been suggested, but could easily prove otherwise
: Obsolete or incorrect information
AXP: Anomalous X-ray Pulsar
BH: Black Hole
CCO: Central Compact Object
NS: Neutron Star
PWN: Pulsar Wind Nebula
SGR: Soft Gamma-ray Repeater
SNR: Supernova Remnant
Bright observations indicate a confident association, while darker shades are for anything else, including uncertain associations and non-associations.
An image of the supernova remnant in Radio and X-ray. Where appropriate, a third X-ray panel of the image is included on the remnant's page, which shows a region of interest.
A unique identifier for each remnant, represented in galactic coordinates.
For consistency the SNR ids are normalized in the form GXXX.X±YY.Y. When the G name has been rounded off, the more precise coordinates can be found in the detailed record. For the objects with no G name given in the literature, we generated it from the J coordinates. These new names are marked with an asterisk*.
Any alternate aliases the remnant has been called, including past, inaccurate names, names of subregions of the remnant, and names of larger complexes to which the remnant belongs.
Can include (with examples):
Information about the remnant, as well as information about the region of space in which the remnant lies.Can include, but is not limited to:
If the remnant has a known supernova event associated with it, the year of that event is shown
Example: The Crab Nebula, with SN=1054
The age of the supernova remnant.
Both the age of the remnant, as well as any possible pulsar, are mentioned.
Most remnants don't have a guaranteed age, and so most ages are estimates. Not all age estimates are included; estimates that have been superceded by newer findings aren't included. These estimates are often model dependant, and so it's advised that you check the associated papers to get a better idea of the age.
Pulsar ages are their characteristic age, and so are commonly higher than their real age.
The distance of the supernova remnant from Earth.
Both the distance of the remnant, as well as any possible pulsar, are mentioned.
Not all distance estimates are included; estimates that have been superceded by newer findings aren't included. These estimates are often model dependant, and so it's advised that you check the associated papers to get a better idea of the distance.
What class of remnant the SNR belongs to.
Of all the observations of the remnant in this energy band, what's the best observation result?
This takes results from all observations we're aware of, and is not limited to the instruments shown on the table. For example, instruments such as Einstein are included.
What kind of quality is the observation of the remnant by this instrument?
If there's been multiple observations with the instrument, the individual observations are shown in the remnant's detailed record.