NGC 3786 is an intermediate spiral galaxy located 107.5 million light-years[2] away in the northern constellation of Ursa Major. It was discovered by English astronomer John Herschel on April 10, 1831. This object appears to form a close pair with its peculiar neighbor to the north, NGC 3788.[7] They show some indications of interaction, such as minor distortion of the disk or tidal features.[8]
The morphological classification of this galaxy is (R')SA(rs)a,[4] indicating a spiral galaxy (SA) with an outer ring (R'), transitional inner ring (rs), and tightly wound spiral arms (a). The galactic plane is inclined at an angle of 61°±2° to the line of sight from the Earth.[9] A mini-bar structure appears in the circumnuclear region.[4][9] It is a type 1.8 Seyfert galaxy, with a detectable X-ray emission that is being partially absorbed by warm, dusty material along the line of sight.[10] The active galactic nucleus of this galaxy is driven by a supermassive black hole with an estimated mass of 5.0×106M☉.[11] An outburst from the core was observed in 1996[12] and a mid-infrared flare in 2022.[11]
Type Ic supernova[13]SN 1999bu was detected from an image taken April 16, 1999. It was magnitude 17.5 and was located at an offset 1.3″ west and 3.1″ south of the galactic nucleus of NGC 3786.[14] A possible progenitor to this core collapse supernova event was identified in 2003 from archival images.[15] A second supernova, SN 2004bd, was discovered April 7, 2004.[16] This was a type Ia supernova located 4.7″ west and 1.2″ south of the nucleus.[17]
^ abcAfanasiev, V. L.; Shapovalova, A. I. (1996), Buta, R.; Crocker, D. A.; Elmegreen, B. G. (eds.), "The presence of a Bar-Like Structure in the Central Regions of Seyfert Galaxies", Barred galaxies; proceedings of a conference held at the University of Alabama; Tuscaloosa; Alabama; 30 May - 3 June 1995, Astronomical Society of the Pacific Conference Series, vol. 91, San Francisco: Astronomical Society of the Pacific, p. 221, Bibcode:1996ASPC...91..221A.
^Keel, William C. (November 2002), A Selection of Seyfert Galaxies, The Department of Physics and Astronomy at the University of Alabama, retrieved 2023-11-07.
^Komossa, S.; Fink, H. (August 1997), "Dusty warm absorbers in active galaxies: the case of NGC 3786", Astronomische Gesellschaft Abstract Series, 13: 247, Bibcode:1997AGAb...13..247K.
Komossa, S.; Fink, H. (November 1997), "Soft X-ray properties of the Seyfert 1.8 galaxy NGC 3786", Astronomy and Astrophysics, 327: 555–561, arXiv:astro-ph/9707071, Bibcode:1997A&A...327..555K.
^ abSon, Suyeon; et al. (September 2022), "A mid-infrared flare in the Seyfert galaxy NGC 3786: A changing-look event triggered by an obscured tidal disruption event?", The Astrophysical Journal, 937 (1): 3, arXiv:2208.08062, Bibcode:2022ApJ...937....3S, doi:10.3847/1538-4357/ac8a9d, 3.
^Nelson, Brant O. (July 1996), "A Correlated Optical-Infrared Outburst of Markarian 744: The Strongest Evidence Yet for Thermal Dust Reverberation", Astrophysical Journal Letters, 465 (2): L87, Bibcode:1996ApJ...465L..87N, doi:10.1086/310151, S2CID120358976.
^Jha, S.; et al. (April 1999), Green, D. W. E. (ed.), "Supernova 1999bu in NGC 3786", IAU Circular, 7149: 2, Bibcode:1999IAUC.7193....3S.
^Li, W. D. (April 1999), Green, D. W. E. (ed.), "Supernova 1999bu in NGC 3786", IAU Circular, 7145: 1, Bibcode:1999IAUC.7145....1L.
^Armstrong, M.; Mobberley, M. (April 2004), Green, D. W. E. (ed.), "Supernova 2004bd in NGC 3786", IAU Circular, 8316: 1, Bibcode:2004IAUC.8316....1A.
^Hamane, T.; Kinugasa, K.; Kawakita, H.; Yamaoka, H. (April 2004), Green, D. W. E. (ed.), "Supernova 2004bd in NGC 3786", IAU Circular, 8317: 3, Bibcode:2004IAUC.8317....3H.
