NGC 4713 is aspiral galaxy in the constellationVirgo. The galaxy lies about 45 millionlight years away from Earth, which means, given its apparent dimensions, that NGC 4713 is approximately 40,000 light years across.[1] It was discovered byWilliam Herschel on April 17, 1786.[3]
The galaxy has a small bright nucleus in a short bar, about 0.35 arcminutes long. A pseudoring with a diameter of 0.4 arcminutes is visible. Two filamentaryspiral arms emerge from the bar with many knots and fragments.[4] The spiral arm pattern is smooth and symmetrical.[5] The galaxy is a strong source ofH-alpha.[6]
In images byHubble Space Telescope NGC 4713 contains a slightly resolvednuclear star cluster with an equivalent-axis half-light radius equal to 0.″07 (5 pc). The mass of the cluster is estimated to be 106.43 ± 0.31 (1.3 – 5.5 millions)M☉. The nucleus also hosts ablack hole with an estimated mass of 104.56 ± 1.66 (800 – 1.7 millions)M☉ based on theSérsic profile of the star cluster.[7] Based on other models, the mass of the central back hole is estimated to be 600 to 9,000 solar masses, which positions it as anintermediate mass black hole.[8] Its nucleus has a spectrum that categorises it as a type 2 transition object, lying between anHII region and aLINER.[9] The galaxy also emitsX-Rays and theFe-K line is faintly detected.[10] The data fromChandra X-ray Observatory show a point X-ray source with a luminosity3.1+1.9 −1.4×1038 erg/s.[8] It is a source of soft X-rays.[11]
The galaxy has a large hydrogen disk, as visible inhydrogen line. The disk appears wrapped beyond the optical disk. The central region of the galaxy, were the bar is located, is deficient in hydrogen.[12] The kinematics suggest that the faint outer disk of the galaxy rotates at an angle with respect to the rest of the galaxy.[13]
^de Vaucouleurs, Gerard Henri; de Vaucouleurs, Antoinette; Shapley, Harlow (1964).Reference catalogue of bright galaxies. Austin: University of Texas Press.Bibcode:1964rcbg.book.....D.
^Vollmer, B.; Soida, M.; Beck, R.; Chung, A.; Urbanik, M.; Chyży, K. T.; Otmianowska-Mazur, K.; Kenney, J. D. P. (May 2013). "Large-scale radio continuum properties of 19 Virgo cluster galaxies: The influence of tidal interactions, ram pressure stripping, and accreting gas envelopes".Astronomy & Astrophysics.553: A116.arXiv:1304.1279.Bibcode:2013A&A...553A.116V.doi:10.1051/0004-6361/201321163.
^Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997). "A Search for 'Dwarf' Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies".The Astrophysical Journal Supplement Series.112 (2):315–390.arXiv:astro-ph/9704107.Bibcode:1997ApJS..112..315H.doi:10.1086/313041.
^Terashima, Yuichi; Hirata, Yoshitaka; Awaki, Hisamitsu; Oyabu, Shinki; Gandhi, Poshak; Toba, Yoshiki; Matsuhara, Hideo (12 November 2015). "A NEW SAMPLE OF OBSCURED AGNs SELECTED FROM THE XMM-NEWTON AND AKARI SURVEYS".The Astrophysical Journal.814 (1): 11.arXiv:1511.00431.Bibcode:2015ApJ...814...11T.doi:10.1088/0004-637X/814/1/11.
^Ghosh, Himel; Mathur, Smita; Fiore, Fabrizio; Ferrarese, Laura (November 2008). "Low-Level Nuclear Activity in Nearby Spiral Galaxies".The Astrophysical Journal.687 (1):216–229.arXiv:0801.4382.Bibcode:2008ApJ...687..216G.doi:10.1086/591508.
^Chung, Aeree; van Gorkom, J. H.; Kenney, Jeffrey D. P.; Crowl, Hugh; Vollmer, Bernd (1 December 2009). "Vla Imaging of Virgo Spirals in Atomic Gas (Viva). I. The Atlas and the H I Properties".The Astronomical Journal.138 (6):1741–1816.Bibcode:2009AJ....138.1741C.doi:10.1088/0004-6256/138/6/1741.
^Watson, Linda C.; Schinnerer, Eva; Martini, Paul; Böker, Torsten; Lisenfeld, Ute (1 June 2011). "Properties of Bulgeless Disk Galaxies. I. Atomic Gas".The Astrophysical Journal Supplement Series.194 (2): 36.arXiv:1010.2497.Bibcode:2011ApJS..194...36W.doi:10.1088/0067-0049/194/2/36.
