SIMBAD references

2012AJ....144...67K - Astron. J., 144, 67 (2012/August-0)

High-resolution H I distributions and multi-wavelength analyses of Magellanic spirals NGC 4618 and NGC 4625.


Abstract (from CDS):

We present a detailed analysis of high-resolution H I observations of the Magellanic spiral galaxies NGC 4618 and NGC 4625. While the H I disk of NGC 4625 is remarkably quiescent with a nearly uniform velocity dispersion and no evidence of H I holes, there is a dynamic interplay between star formation and the distribution of neutral hydrogen in NGC 4618. We calculate the critical density for widespread star formation in each galaxy and find that star formation proceeds even where the surface density of the atomic gas is well below the critical density necessary for global star formation. There are strong spatial correlations in NGC 4618 between UV emission, 1.4 GHz radio continuum emission, and peaks in the H I column density. Despite the apparent overlap of the outer disks of the two galaxies, we find that they are kinematically distinct, indicating that NGC 4618 and NGC 4625 are not interacting. The structure of NGC 4618 and, in particular, the nature of its outer ring are highly suggestive of an interaction, but the timing and nature of such an interaction remain unclear.

Abstract Copyright:

Journal keyword(s): galaxies: individual (NGC 4618, NGC 4625) - galaxies: irregular - galaxies: kinematics and dynamics

Nomenclature: Fig. 8, Table 1: [KW2012] N (Nos 1-6).

Simbad objects: 26

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2012AJ....144...67K and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact