Joseph likes Astronomy, and they have been talking about Centaurus A, the galaxy in the constellation of Centaurus that was discovered by James Dunlop on a day like today in 1826.
James Dunlop (31 October 1793-22 September 1848) was a Scottish astronomer, noted for his work in Australia. He was employed by Sir Thomas Brisbane to work as astronomer's assistant at his private observatory, once located at Paramatta, now named Parramatta, New South Wales, about 23 kilometres west of Sydney during the 1820s and 1830s.
Dunlop was mostly a visual observer, doing stellar astrometry work for Brisbane, and after its completion, then independently discovered and catalogued many new telescopic southern double stars and deep-sky objects. He later became the Superintendent of Paramatta Observatory when it was finally sold to the New South Wales Government.
More information: NASA
Centaurus A (also known as NGC 5128 or Caldwell 77) is a galaxy in the constellation of Centaurus.
It was discovered in 1826 by Scottish astronomer James Dunlop from his home in Parramatta, in New South Wales, Australia.
There is considerable debate in the literature regarding the galaxy's fundamental properties such as its Hubble type, lenticular galaxy or a giant elliptical galaxy, and distance (10–16 million light-years).
NGC 5128 is one of the closest radio galaxies to Earth, so its active galactic nucleus has been extensively studied by professional astronomers. The galaxy is also the fifth-brightest in the sky, making it an ideal amateur astronomy target. It is only visible from the Southern Hemisphere and low northern latitudes.
The centre of the galaxy contains a supermassive black hole with a mass of 55 million solar masses, which ejects a relativistic jet that is responsible for emissions in the X-ray and radio wavelengths. By taking radio observations of the jet separated by a decade, astronomers have determined that the inner parts of the jet are moving at about half of the speed of light. X-rays are produced farther out as the jet collides with surrounding gases, resulting in the creation of highly energetic particles. The X-ray jets of Centaurus A are thousands of light-years long, while the radio jets are over a million light-years long.
More information: European Southern Observatory
Like other starburst galaxies, a collision is suspected to be responsible for the intense burst of star formation. Models have suggested that Centaurus A was a large elliptical galaxy that collided with a smaller spiral galaxy, with which it will eventually merge. For that reason, the galaxy has been for years under particular interest in astronomers. While collisions of spiral galaxies are relatively common, the effects of an elliptical and a spiral collision are not fully known.
NGC 5128 was discovered on 29 April 1826 by James Dunlop during a survey at the Parramatta Observatory.
In 1847 John Herschel described the galaxy as two semi-ovals of elliptically formed nebula appearing to be cut asunder and separated by a broad obscure band parallel to the larger axis of the nebula, in the midst of which a faint streak of light parallel to the sides of the cut appears.
The Einstein Observatory detected an X-ray jet emanating from the nucleus in 1979. Ten years later, young blue stars were found along the central dust band with the Hubble Space Telescope.
The Chandra X-ray Observatory identified in 1999 more than 200 new point sources. Another space telescope, the Spitzer Space Telescope, found a parallelogram-shaped structure of dust in near infrared images of Centaurus A in 2006.
Evidence of gamma emissions with very high energy, more than 100 GeV, was detected by the H.E.S.S-Observatorium in Namibia in 2009.
The following year, Centaurus A was identified as a source of cosmic rays of the highest energies, after years of observations by Pierre Auger Observatory. In 2016 a review of data from Chandra and XMM-Newton, unusual high flares of energy were found in NGC 5128 and the galaxy NGC 4636. Jimmy Erwin of University of Alabama hypothesized the discovery as potentially a black hole in a yet unknown process or an intermediate-mass black hole.
Centaurus A may be described as having a peculiar morphology. As seen from Earth, the galaxy looks like a lenticular or elliptical galaxy with a superimposed dust lane. The peculiarity of this galaxy was first identified in 1847 by John Herschel, and the galaxy was included in Halton Arp's Atlas of Peculiar Galaxies, published in 1966, as one of the best examples of a disturbed galaxy with dust absorption. The galaxy's strange morphology is generally recognized as the result of a merger between two smaller galaxies.
More information: Nine Planets
The bulge of this galaxy is composed mainly of evolved red stars. The dusty disk, however, has been the site of more recent star formation; over 100-star formation regions have been identified in the disk.
Two supernovae have been detected in Centaurus A. The first supernova, named SN 1986G, was discovered within the dark dust lane of the galaxy by R. Evans in 1986. It was later identified as a Type Ia supernova, which forms when a white dwarf's mass grows large enough to ignite carbon fusion in its center, touching off a runaway thermonuclear reaction, as may happen when a white dwarf in a binary star system strips gas away from the other star. SN 1986G was used to demonstrate that the spectra of type Ia supernovae are not all identical, and that type Ia supernovae may differ in the way that they change in brightness over time.
The second supernova, dubbed SN2016adj, was discovered by Backyard Observatory Supernova Search in February 2016 and was initially classified as a Type II supernova based on its H-alpha emission line. A subsequent classification found the spectrum best resembled the Type Ib core-collapse supernova 1999dn.
Distance estimates to Centaurus A established since the 1980s typically range between 3–5 Mpc. Classical Cepheids discovered in the heavily obscured dust lane of Centaurus A yield a distance between ~3–3.5 Mpc, depending on the nature of the extinction law adopted and other considerations.
More information: Constellation Guide
Mira's variables and Type II Cepheids were also discovered in Centaurus A, the latter being rarely detected beyond the Local Group. The distance to Centaurus A established from several indicators such as Mira variables and planetary nebulae favour a more distant value of ~3.8 Mpc.
Centaurus A is at the centre of one of two subgroups within the Centaurus A/M83 Group, a nearby group of galaxies. Messier 83, the Southern Pinwheel Galaxy, is at the centre of the other subgroup. These two groups are sometimes identified as one group and sometimes identified as two groups. However, the galaxies around Centaurus A and the galaxies around M83 are physically close to each other, and both subgroups appear not to be moving relative to each other. The Centaurus A/M83 Group is located in the Virgo Supercluster.
Centaurus A is located approximately 4° north of Omega Centauri, a globular cluster visible with the naked eye.
Because the galaxy has a high surface brightness and relatively large angular size, it is an ideal target for amateur astronomy observations. The bright central bulge and dark dust lane are visible even in finder scopes and large binoculars, and additional structure may be seen in larger telescopes.
Centaurus A is visible to the naked eye under excellent conditions.
More information: Constellation Guide
We find that we live on an insignificant planet
of a humdrum star lost in a galaxy tucked away
in some forgotten corner of a universe
in which there are far more galaxies than people.
Carl Sagan
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