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.