TheCygnus Loop (radio source W78, orSharpless 103) is a largesupernova remnant (SNR) in theconstellationCygnus, anemission nebula measuring nearly 3° across.[1] Some arcs of the loop, known collectively as theVeil Nebula or Cirrus Nebula, emit in the visibleelectromagnetic range.[1] Radio, infrared, and X-ray images reveal the complete loop.
The visual portion of the Cygnus Loop is known as the Veil Nebula, also called the Cirrus Nebula or the Filamentary Nebula. Several components have separate names and identifiers,[2][3] including the "Western Veil" or "Witch's Broom", the "Eastern Veil", and Pickering's Triangle.
NGC 6960, theWestern Veil, is the western part of the remnant, also known as the "Witch's Broom", located at J2000RA20h 45m 58.1sDec +30° 35′ 43″.[3] As the westernmost NGC object in the nebula (first inright ascension), its number is sometimes used as an NGC identifier for the nebula as a whole.
These three luminous areas make up theEastern Veil. NGC 6992 is an HI shell located along the north-eastern edge of the loop at J2000RA20h 56m 19.0sDec +31° 44′ 34″.[4] NGC 6995 is located farther south at J2000RA20h 57m 10.7sDec +31° 14′ 07″,[5] and IC 1340 even farther south at J2000RA20h 56m 12.0sDec +31° 04′ 00″.[6]
Also known as Pickering's Wedge, or Pickering's Triangular Wisp, this segment of relatively faint nebulosity was discovered photographically in 1904 byWilliamina Fleming at Harvard Observatory, whereEdward Charles Pickering was director at the time. The Triangle is brightest along the northern side of the loop, though photographs show the nebulosity extending into the central area as well.
These two objects are generally identified today (as by the NGC/IC Project andUranometria) with two brighter knots of nebulosity in a cloud at the northern edge of the loop, to the east of the northern edge of Pickering's Triangle. NGC 6979 was reported byWilliam Herschel, and while the coordinates he recorded for Veil objects were somewhat imprecise,[7] his position for this one is tolerably close to the knot at J2000RA20h 50m 27.9sDec +32° 01′ 33″.[7]
The identifierNGC 6979 is sometimes taken to refer to Pickering's Triangle,[8] but the Triangle is probably not what Herschel saw or what the Catalogue intended for this entry: it was discovered only photographically, after the Catalogue was published, and long after Herschel's observation.
NGC 6974 was reported byLord Rosse, but the position he gave lies in an empty region inside the main loop. It was assumed that he recorded the position incorrectly, and theNew General Catalogue gives Rosse's object as the other knot in the northern cloud, located at J2000RA20h 51m 04.3sDec +31° 49′ 41″, one degree north of Rosse's position.[9] (This position is farther east than NGC 6979, even though NGC objects are generally ordered by increasing RA.) These filaments in the north-central area are sometimes known as the "carrot".[10] The spectrum at 34.5 MHz of the region associated with NGC 6974 ranges straight over the entire frequency range 25 to 5000 MHz.[11]
The southeastern knot is located at J2000RA20h 56m 21.2sDec +30° 23′ 59″ on the southeastern rim of the Cygnus Loop. The knot has been identified as an encounter between the blast wave from the supernova and a small isolated cloud.[12] The knot is a prominent X-ray feature, consisting of a number of filaments correlated with visual line emission.[12] By combining visual and X-ray data, it can be shown that the southeastern knot is an indentation on the surface of the blast wave, not a small cloud but the tip of a larger cloud.[12] The presence of a reverse shock is evidence that the knot represents an early stage of a blast wave encountering a large cloud.[12]
Until 1999, the most often-quoted distance to the supernova remnant was a 1958 estimate made byR. Minkowski, combining his radial velocity measurements withE. Hubble's proper motion study of the remnant's optical filaments to calculate a distance of 770 parsecs or 2500light-years.[13][14] However, in 1999, William Blair, assuming that the shock wave should be expanding at the same rate in all directions, compared the angular expansion along the sides of the bubble (visible inHubble Space Telescope images) with direct line-of-sight measurements of the radial expansion towards the Earth and concluded that the actual size of the bubble was about 40% smaller than the conventional value, leading to a distance of about 1470 ly.[13][14]
A larger revised value of 540 pc (1760 ly) appeared to be corroborated by Blair's later discovery, via theFar Ultraviolet Spectroscopic Explorer (FUSE), of a star seeminglybehind the Veil. A UV spectrum of this star, KPD 2055+3111 ofspectral type sdOB, showed absorption lines in its spectrum indicate that its light is partially intercepted by the supernova remnant. With an estimated (but uncertain) distance of about 1860 ly away, this star seemed to support the revised estimate of 1760 ly.[14]
More recent investigations of the Cygnus Loop's distance usingGaia parallax measurements of several stars seen toward the Cygnus Loop have led to more accurate distance estimates.[15][16] One of these stars, a 9.6 magnitude B8 star (BD+31 4224) located near the remnant's northwestern rim shows evidence of interactions of its stellar wind with the Cygnus Loop's shock wave, thereby indicating it is located actually inside the remnant.[15] This star's Gaia estimated distance of around 730 pc, along with two other stars both at about 740 pc which exhibit spectral features indicating they must lie behind the remnant, leads to new distance of 72515 pc or around 2400 light-years. The Gaia estimated distance to the sdOB star KPD 2055+3111 is 819 pc (2,670 ly). This new distance, surprisingly close to the value estimated some 60 years ago by Minkowski, means the Cygnus Loop is physically some 37 pc (120 ly) in diameter and has an age of around 20,000 years.[16]
The brightestfar-ultraviolet sources of the Cygnus Loop occur in the north-east edge of the remnant. The first flight of the High Resolution Emission Line Spectrometer (HIRELS), a wide-field, far-ultraviolet nebular spectrometer, tuned to OVIemission lines, was launched aboard aNike-Black Brant fromWhite Sands Missile Range to observe the Cygnus Loop, the first observed galactic OVI emission line source.[17]
The X-ray source Cygnus X-5 coincides with SNR G074.0-08.6 (the Cygnus Loop), located at J2000RA20h 51.1mDec +30° 41′, observed byUhuru at 4U 2046+31. This source also has catalogue numbers 1E 2049.4+3050, 1H 2050+310, and 1M 2051+309, having been observed by theEinstein Observatory,HEAO 1, andOSO 7, respectively.
The Cygnus Loop is a strong source of soft X-rays.[18]
The center of the supernova shell as determined from X-ray data lies at J1950RA20h 49m 45sDec +30° 53′.[19] A characteristic thermal temperature averaged over the loop from X-ray spectral data is Tx = 2.9 ± 1.5 x 106 K.[19] An X-ray surface brightness map of the loop was obtained with a one-dimensional X-ray telescope flown aboard anAerobee 170sounding rocket launched on March 30, 1973, from theWhite Sands Missile Range.[19]
Most stars that produce supernovae leave behindcompact stellar remnants- aneutron star orblack hole, typically depending on the mass of the original star. Various techniques based on the features of the supernova remnant estimate the Cygnus Loop progenitor star's mass at 12 to 15Solar masses,[20][21] a value that puts the expected remnant firmly within neutron star boundaries.[22] However, despite many searches, no compact stellar remnant had been confidently identified since the identification of the supernova remnant.
A noted anomaly is that in X-rays, the nebula appears perfectly spherical aside from a "blowout region" to the south. Searches for a compact stellar remnant have been largely concentrated here, as the hole may have been caused by the violent ejection of a neutron star.[22] A detailed 2012 study of the blowout region identified a possible pulsar wind nebula, as well as a point-like source within it. Although at almost exactly the same position as a knownSeyfert galaxy, the slight offset combined with a lack of a radio counterpart makes the point-like source probably unrelated to the galaxy. Whether the feature is a pulsar wind nebula, and if so whether it is related to the Cygnus Loop, is still unknown for certain.[22] If it is indeed the compact stellar remnant of the supernova, the neutron star would have to have been ejected from the center of the nebula at a speed of roughly1,850 km/s, depending on the precise age and distance of the remnant.[22]
In the novelMindbridge byJoe Haldeman, the Cygnus Loop is the remains of the home star of an omnipotent, immortal race that ultimately decided to destroy itself.
