G299.2-2.9
{{Short description|Supernova remnant in the Milky Way}}
{{Infobox astronomical event
| name = G299.2-2.9
| image = Наднова G299.2-2.9.jpg
| caption = Shell structure of G299.2-2.9
| epoch = J2000
| type = SN Ia
| SNRtype = Mixed Morphology
| host = Milky Way
| constellation = Musca
| ra = {{RA|12|15|13.0}}{{cite simbad | title= SNR G299.2-02.9 | access-date=2024-11-18}}
| gal =
| dist_ly =
| size_v =
| mag_v =
| distance = 16,000 ly
| discovery =
| iauc =
| notes = Complex outer shell structure
}}
G299.2-2.9 is a supernova remnant in the Milky Way, 16,000 light years from Earth.{{Cite journal |last1=Park |first1=Sangwook |last2=Slane |first2=Patrick O. |last3=Hughes |first3=John P. |last4=Mori |first4=Koji |last5=Burrows |first5=David N. |last6=Garmire |first6=Gordon P. |date=2007-08-20 |title=Chandra X-Ray Study of Galactic Supernova Remnant G299.2-2.9 |journal=The Astrophysical Journal |volume=665 |issue=2 |pages=1173–1181 |doi=10.1086/520105 |arxiv=0706.0524 |bibcode=2007ApJ...665.1173P |issn=0004-637X}} It is the remains of a Type Ia supernova.{{Cite web |title=INSPIRE |url=https://inspirehep.net/literature/752279 |access-date=2024-03-21 |website=inspirehep.net}}
The observed radius of the remnant shell translates to approximately 4,500 years of expansion,{{Cite journal |last1=Park |first1=Sangwook |last2=Slane |first2=Patrick O. |last3=Hughes |first3=John P. |last4=Mori |first4=Koji |last5=Burrows |first5=David N. |last6=Garmire |first6=Gordon P. |date=2007-08-20 |title=Chandra X-Ray Study of Galactic Supernova Remnant G299.2–2.9 |url=https://iopscience.iop.org/article/10.1086/520105/meta |journal=The Astrophysical Journal |language=en |volume=665 |issue=2 |pages=1173 |doi=10.1086/520105 |bibcode=2007ApJ...665.1173P |issn=0004-637X|arxiv=0706.0524 }} making it one of the oldest observed Type Ia supernova remnants.{{Cite web |title=Supernovas & Supernova Remnants {{!}} ChandraBlog {{!}} Fresh Chandra News |url=https://chandra.harvard.edu/blog/node/314 |access-date=2024-04-18 |website=chandra.harvard.edu}}
Description
G299.2-2.9 gives astronomers an opportunity to study how supernova remnants evolve and warp over time. G299.2-2.9 also provides a glimpse of the explosion that produced it. G299.2-2.9 is split into several distinct and different regions: an almost complete bubble interrupted only by a blow-out, a bright center, a complex "knot" region on the northeastern edge of the bubble structure and a diffuse emission extending beyond the main structure.{{Cite web |title=European Association for Astronomy Education » G299.2-2.9: A Middle-Aged Supernova Remnant |url=https://eaae-astronomy.org/blog/?p=4178 |access-date=2024-03-21 |language=en-US}} It has been heavily documented by multiple satellites and in-orbit telescopes, including the Hubble Space Telescope, Spitzer Telescope,{{Cite web |last=JPL/NASA |title=Telescopes help solve ancient supernova mystery |url=https://phys.org/news/2011-10-telescopes-ancient-supernova-mystery.html |access-date=2024-04-18 |website=phys.org |language=en}} and Chandra.{{Cite web |last=Institution |first=Smithsonian |title=A Tour of G299.2-2.9 |url=https://www.si.edu/object/yt_30ZAraQyymU |access-date=2024-04-18 |website=Smithsonian Institution |language=en}}
The small X-ray emission from the deep portions of G299.2-2.9 shows large quantities of iron and silicon,{{Cite web |title=Chandra :: Photo Album :: G299.2-2.9 :: October 12, 2011 |url=https://chandra.harvard.edu/photo/2011/g299/ |access-date=2024-03-21 |website=chandra.harvard.edu}} which indicates that it is a remnant of a Type Ia supernova. The outer "shell" is large and complex, with a multi-shell structure. Outer shells similar to G299.2-2.9 are usually not associated with exploded stars.{{Cite web |last=Studio |first=NASA Scientific Visualization |date=2011-04-27 |title=NASA Scientific Visualization Studio {{!}} Tycho's Supernova Remnant: NASA'S Chandra Finds New Evidence on Origin of Supernovas |url=https://svs.gsfc.nasa.gov/30153 |access-date=2024-04-18 |website=NASA Scientific Visualization Studio |language=english}} Since theories about Type Ia supernovae assume they go off in a specified environment, detailed studies of the outer "shell" of G299.2-2.9 have helped astronomers{{Cite web |title=SNRcat - G299.2-02.9 |url=http://snrcat.physics.umanitoba.ca/SNRrecord.php?id=G299.2m02.9 |access-date=2024-03-21 |website=snrcat.physics.umanitoba.ca}} improve their understanding of the areas and situations where thermonuclear explosions occur.{{Cite journal |last1=Slane |first1=Patrick |last2=Vancura |first2=Olaf |last3=Hughes |first3=John P. |date=1996 |title=A study of the evolutionary state of the supernova remnant G299.2-2.9 |url=https://www.researchwithrutgers.com/en/publications/a-study-of-the-evolutionary-state-of-the-supernova-remnant-g2992- |journal=Astrophysical Journal |volume=465 |issue=2 PART I |pages=840–844 |doi=10.1086/177467 |bibcode=1996ApJ...465..840S |issn=0004-637X}}
Gallery
File:Middle Aged Supernova remnant G299.2-02.9.jpg|Composite image using X-ray light from Chandra (orange) that has been overlaid on an infrared image from 2MASS.{{Cite web |title=Chandra :: Photo Album :: G299.2-2.9 :: February 12, 2015 |url=https://chandra.harvard.edu/photo/2015/g299/ |access-date=2024-03-21 |website=chandra.harvard.edu}}
File:Exploded Star Blooms Like a Cosmic Flower (19051569762).jpg|Red, green and blue represent low, medium and high-energy X-rays – Chandra.
File:Наднова G299.2-2.9.jpg|Chandra X-ray Observatory – NASA.