C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET22:50:00

2003A&A...401..443M - Astronomy and Astrophysics, volume 401, 443-461 (2003/4-2)

XMM observation of M 87. II. Abundance structure of the interstellar and intergalactic medium.


Abstract (from CDS):

Based on a detailed study of the temperature structure of the intracluster medium in the halo of M 87, abundance profiles of 7 elements, O, Mg, Si, S, Ar, Ca, and Fe are derived. In addition, abundance ratios are derived from the ratios of line strengths, whose temperature dependences are small within the temperature range of the ICM of M 87. The abundances of Si, S, Ar, Ca and Fe show strong decreasing gradients outside 2' and become nearly constant within the radius at ∼1.5 solar. The Fe/Si ratio is determined to be 0.9 solar with no radial gradient. In contrast, the O abundance is less than a half of the Si abundance at the center and has a flatter gradient. The Mg abundance is ∼1 solar within 2', which is close to stellar abundance within the same radius. The O/Si/Fe pattern of M 87 is located at the simple extension of that of Galactic stars. The observed Mg/O ratio is about 1.25 solar, which is also the same ratio as for Galactic stars. The O/Si/Fe ratio indicates that the SN Ia contribution to Si and Fe becomes important towards the center and SN Ia products have similar abundances of Si and Fe at least around M 87, which may reflect dimmer SN Ia observed in old stellar systems. The S abundance is similar to the Si abundance at the center, but has a steeper gradient. This result suggests that the S/Si ratio of SN II products is much smaller than the solar ratio.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M 87 - galaxies: intergalactic medium - galaxies: ISM - X-rays: galaxies: clusters

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 664 2
2 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6347 3
3 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 550 0
4 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1048 1

    Equat.    Gal    SGal    Ecl

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