NGC 3786 is anspiral galaxy located 107.5 millionlight-years[2] away in the northernconstellation ofUrsa Major. It was discovered by English astronomerJohn 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 ofinteraction, such as minor distortion of the disk ortidal features.[8]
Themorphological classification of this galaxy is (R')SA(rs)a,[4] indicating an unbarred spiral galaxy (SA) with an outer ring (R'), transitional inner ring (rs), and tightly woundspiral arms (a). Thegalactic plane is inclined at an angle of61°±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 1.8Seyfert galaxy, with a detectableX-ray emission that is being partially absorbed by warm, dusty material along the line of sight.[10] Theactive galactic nucleus of this galaxy is driven by asupermassive black hole with an estimated mass of5.0×106M☉.[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 offset1.3″ west and3.1″ south of the galactic nucleus of NGC 3786.[14] A possible progenitor to thiscore collapse supernova event was identified in 2003 from archival images.[15] A second supernova,SN 2004bd, was discovered April 7, 2004.[16] This was atype Ia supernova located4.7″ west and1.2″ 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, retrieved2023-11-07.
^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.
