On the metal abundance in the core of M87

Details On the metal abundance in the core of M87 On the metal abundance in the core of M87

2001-06-29

arxiv.org/abs/astro-ph/0106553v1

Astronomy and Astrophysics

Astrophysics

To appear in A&A Letters

Scientific paper

10.1051/0004-6361:20010871

We revisit the XMM-Newton observation of M87 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 M87, 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 2000a,b) following from the application of an oversimplified spectral model to the data.

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