Volume 375, Number 1, August III 2001
|Page(s)||L14 - L17|
|Published online||15 August 2001|
On the metal abundance in the core of M 87
Istituto di Fisica Cosmica, CNR, via Bassini 15, 20133 Milano, Italy
2 Università di Milano Bicocca, Dip. di Fisica, P.za della Scienza 3 20133 Milano, Italy
Corresponding author: S. Molendi, firstname.lastname@example.org
Accepted: 19 June 2001
We revisit the XMM-Newton observation of M 87 to make a new and more detailed measurement of the metal abundance profile. After having verified that spectral fits with single temperature models show a dramatic abundance drop within 1 arcmin of the cluster core, we show that more appropriate models, which include a multi-temperature component to account for the strong temperature gradient observed in M 87, and a power-law component to account for the emission of the nucleus and knot A, give a substantially flat abundance profile. The drastic abundance decrement found by fitting a single temperature component to the data is an artifact known as "Fe-bias" (Buote [CITE]a,b) following from the application of an oversimplified spectral model to the data.
Key words: X-rays: galaxies / galaxies: clusters: general / galaxies: individual: M 87
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.