ar X iv : a st ro - p h / 98 03 01 2 v 1 3 M ar 1 99 8 IS M 82 A DISK - TRUNCATED BULGE BY A CLOSE ENCOUNTER WITH M 81 ?
نویسنده
چکیده
The rotation curve of the small-mass starburst galaxy M82 has a steep nuclear rise, peaking at 200 pc radius, and then, declines in a Keplerian fashion. This rotation curve mimics that for a central bulge of spiral galaxies with high concentration of stellar mass. The declining rotation indicates that its extended disk mass is missing. In order to explain this peculiar rotation characteristics, we propose a hypothesis that M82 is a surviving central bulge of a much larger disk galaxy, whose outer disk was truncated during a close encounter with M81. We simulate a tidal truncation of the disk of a companion galaxy by a tidal penetration through its more massive parent galaxy. The model can well reproduce the observed peculiar feature of M82. Subject headings: Galaxies: collision – Galaxies: starburst – Galaxies: tidal interaction – Galaxies: bulges
منابع مشابه
ar X iv : a st ro - p h / 98 03 02 5 v 1 3 M ar 1 99 8 RXTE / ASM OBSERVATIONS OF PSR B 1259 − 63
RXTE/ASM observations of PSR B1259−63 near the 1997 periastron passage find no emission brighter than ∼10 times that detected by ASCA during the 1994 periastron encounter, demonstrating that the pulsar is unlikely to have undergone even brief episodes of accretion.
متن کاملar X iv : a st ro - p h / 98 03 21 2 v 1 1 8 M ar 1 99 8 Anisotropy of CMB & Cosmological Model
In this brief review I will touch upon the main points and trends of observational and theoretical cosmology, that influence and change today our understanding of the Universe.
متن کاملar X iv : a st ro - p h / 99 01 23 3 v 1 1 8 Ja n 19 99 Long term BeppoSAX - WFC monitoring of GRS 1758 - 258
Following a series of deep observations of the Galactic Bulge region performed with the Wide Field Cameras telescopes on board BeppoSAX, it has been possible to study throughout a long time period a number of persistent X-ray sources. We report on the behaviour of GRS 1758-258, an X-ray binary suggested as a black hole candidate on the basis of its timing and spectral characteristics. The sourc...
متن کاملar X iv : a st ro - p h / 99 01 10 8 v 1 1 0 Ja n 19 99 Accretion Disk Models
Models of black hole accretion disks are reviewed, with an emphasis on the theory of hard X-ray production. The following models are considered: i) standard, ii) super-critical, iii) two-temperature, and iv) disk+corona. New developments have recently been made in hydrodynamical models of accretion and in phenomenological radiative models fitting the observed X-ray spectra. Attempts to unify th...
متن کاملar X iv : a st ro - p h / 98 03 03 9 v 1 4 M ar 1 99 8 Cosmology With High - Redshift Water Masers
Multi-epoch VLBA observations of the maser in NGC 4258 have yielded a 4% geometrical distance to the galaxy. The potential scientific payoffs of finding similar objects at large distances, in the Hubble flow, are considerable. In this contribution, I discuss the plausibility of detecting high-redshift water masers, and describe a search strategy that we have implemented to realize this objective.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998