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NGC 6744
NGC 6744
	Wide Field Imager view of a Milky Way look-alike NGC 6744
Observation data (J2000 epoch)
Constellation	Pavo
Right ascension	19h 09m 46.1785s
Declination	−63° 51′ 26.992″
Redshift	0.002805
Heliocentric radial velocity	841 ± 2 km/s
Distance	23.63 ± 1.68 Mly (7.244 ± 0.514 Mpc)
Group or cluster	Virgo Supercluster
Apparent magnitude (V)	9.14
Characteristics
Type	SAB(r)bc
Size	~171,800 ly (52.68 kpc) (estimated)
Apparent size (V)	20.0′ × 12.9′
Other designations
	Caldwell 101, ESO 104- G 042, IRAS 19051-6357, PGC 62836

NGC 6744 (also known as Caldwell 101 or the Pavo Galaxy^[3]) is an intermediate spiral galaxy in the constellation Pavo (Peacock). Its velocity with respect to the cosmic microwave background is 802 ± 3 km/s, which corresponds to a Hubble distance of 38.6 ± 2.7 Mly (11.82 ± 0.83 Mpc).^[1] However, 21 non redshift measurements give a distance of 23.63 ± 1.68 Mly (7.244 ± 0.514 Mpc).^[2] It was discovered on 30 June 1826 by Scottish astronomer James Dunlop, observing from Parramatta, Australia.^[4]

One of the largest spiral galaxies, NGC 6744 is considered as a Milky Way mimic in the immediate vicinity, displaying flocculent (fluffy) arms and an elongated core.^[5]^[6] It also has at least one distorted companion galaxy (NGC 6744A) superficially similar to one of the Magellanic Clouds.^[7]

NGC 6744 is a LINER galaxy, i.e. its nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.^[6] Also, the galaxy has an active galactic nucleus (AGN) of low luminosity.^[6]

NGC 6744 lies within the Virgo Supercluster.^[8]^[9]

Supernovae

Two supernovae have been observed in NGC 6744:

R. Martin and Berto Monard discovered SN 2005at (type Ic, mag. 16) on 15 March 2005.^[10]^[11]
BlackGEM discovered another astronomical transient, designated SN 2024vjm, on 13 September 2024.^[12] After initial Spectral analysis, the star was classified as a peculiar nova, but further observations showed the object to be a faint type Iax supernova, likely the closest known of this type.^[13]^[14]^[15]

Gallery

Euclid's view of spiral galaxy NGC 6744
The nucleus of NGC 6744 imaged by the Hubble Space Telescope

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "Results for object NGC 6744". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 31 August 2006.
^ ^a ^b "Distance Results for NGC 6744". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 19 June 2010.
^ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
^ Seligman, Courtney. "NGC Objects: NGC 6700–6749". cseligman.com. Retrieved 14 February 2019.
^ "Euclid's new image of spiral galaxy NGC 6744". www.esa.int. Retrieved 11 November 2024.
^ ^a ^b ^c Silva, Patrícia da; Steiner, J. E.; Menezes, R. B. (2018). "NGC 6744: A Nearby Milky Way Twin with a Very Low-luminosity AGN". The Astrophysical Journal. 861 (2): 83. arXiv:1807.02604. Bibcode:2018ApJ...861...83D. doi:10.3847/1538-4357/aac6e3.
^ "NASA/IPAC Extragalactic Database". Results for NGC 6744A. Retrieved 19 June 2010.
^ P. Fouque; E. Gourgoulhon; P. Chamaraux; G. Paturel (1992). "Groups of galaxies within 80 Mpc. II – The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.
^ "Nearby Groups of Galaxies". ned.ipac.caltech.edu. Retrieved 4 May 2018.
^ Martin, R.; Yamaoka, H.; Monard, L. A. G.; Africa, S. (2005). "Supernovae 2005at and 2005au". International Astronomical Union Circular (8496): 1. Bibcode:2005IAUC.8496....1M.
^ "SN 2005at". Transient Name Server. IAU. Retrieved 13 December 2024.
^ "Discovery certificate for object 2024vjm". Transient Name Server. IAU. Retrieved 15 September 2024.
^ "SN 2024vjm". Transient Name Server. IAU. Retrieved 15 September 2024.
^ "AstroNote 2024-258". Transient Name Server. IAU. Retrieved 15 September 2024.
^ "AstroNote 2024-265". Transient Name Server. IAU. Retrieved 20 September 2024.