C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST22:00:47

2001A&A...367..428A - Astronomy and Astrophysics, volume 367, 428-442 (2001/2-4)

Growth of galactic bulges by mergers. I. Dense satellites.


Abstract (from CDS):

Andredakis et al. (1995MNRAS.275..874A) fit Sersic's law µ(r)∼r1/n to the bulges of the Balcells & Peletier (1994AJ....107..135B) galaxy sample, and infer that n drops with morphological type T from n≃4-6 for S0 to n=1 (exponential) for Sc's. We use collisionless N body simulations to test the assumption that initially the surface brightness profiles of all bulges were exponential, and that the steepening of the profiles toward the early-types is due to satellite accretion. The results are positive. After the accretion of a satellite, bulge-disk fits show that the bulge grows and that the bulge profile index n increases proportional to the satellite mass. For a satellite as massive as the bulge, n rises from 1 to 4. We present kinematic diagnostics on the remnants and disk thickening. The latter suggests that the bulge growth must have occurred before the last formation of a thin disk in the galaxy. The thick disks created by the merger are reminiscent of thick disks seen in early-type edge-on galaxies. The efficiency of the process suggests that present day bulges of late-type spirals showing exponential profiles cannot have grown significantly by collisionless mergers.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: spiral - galaxies: structure

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 985 1
2 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1109 2

    Equat.    Gal    SGal    Ecl

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