SIMBAD references

2008ApJ...688..931K - Astrophys. J., 688, 931-944 (2008/December-1)

X-ray tail in NGC 7619.


Abstract (from CDS):

We present new observational results of NGC 7619, an elliptical galaxy with a prominent X-ray tail and a dominant member of the Pegasus group. With Chandra and XMM-Newton observations, we confirm the presence of a long X-ray tail in the southwest direction; moreover, we identify for the first time a sharp discontinuity of the X-ray surface brightness in the opposite (northeast) side of the galaxy. The density, temperature, and pressure jump at the northeast discontinuity suggest a Mach number ∼1, corresponding to a galaxy velocity of ∼500 km/s, relative to the surrounding hot gas. Spectral analysis of these data shows that the iron abundance of the hot gaseous medium is much higher (1-2 solar) near the center of NGC 7619 and in the tail extending from the core than in the surrounding regions (≤1/2 solar), indicating that the gas in the tail is originated from the galaxy. The possible origin of the head-tail structure is either ongoing ram pressure stripping or sloshing. The morphology of the structure is more in line with a ram pressure stripping phenomenon, while the position of NGC 7619 at the center of the Pegasus I group, and its dominance, would prefer sloshing.

Abstract Copyright:

Journal keyword(s): galaxies: individual (NGC 7619) - galaxies: individual (NGC 7626) - Galaxies: ISM - X-Rays: Galaxies

CDS comments: ULX in table 2 is EQ J2320+0811

Simbad objects: 21

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2008ApJ...688..931K and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact