Gravitational effects of M32 on the spiral arm pattern of M31
1978; IOP Publishing; Volume: 226; Linguagem: Inglês
10.1086/156585
ISSN1538-4357
Autores Tópico(s)Astronomy and Astrophysical Research
Resumoview Abstract Citations (46) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Gravitational effects of M32 on the spiral arm pattern of M31. Byrd, G. G. Abstract A simple computer model of a disk of zero-mass test particles is used to show that certain features of the H I disk and spiral-arm pattern of the Andromeda galaxy, M31, can be explained by gravitational action of its companion galaxy M32. The orbit assumed for M32 was the same as that which was previously shown to explain 21-cm velocity asymmetries in M31. This is additional verification of M32's close orbit, which actually cuts through M31's disk, suggesting that M32 is important in determining the spiral pattern of M31. The results of the model are used to obtain the spiral-arm pattern for the disk of M31, clarifying the identity of several arms which are superposed on other arms by M32's gravitational action. These spiral-arm irregularities are strong enough that failure to consider them may lead to misinterpretation in attempts to verify the density-wave theory in observations, particularly those northwest of the major axis. Publication: The Astrophysical Journal Pub Date: November 1978 DOI: 10.1086/156585 Bibcode: 1978ApJ...226...70B Keywords: Andromeda Galaxy; Elliptical Galaxies; Galactic Structure; Gravitational Effects; Astronomical Models; Computerized Simulation; Density Wave Model; Disks (Shapes); H Lines; Orbital Mechanics; Radial Velocity; Radio Astronomy; Astrophysics; Andromeda Nebula:H I Disk; Andromeda Nebula:Internal Motions; Andromeda Nebula:Spiral Arms full text sources ADS | data products NED (1)
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