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, email@example.com
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
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