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The distance to the Sagittarius dwarf spheroidal galaxy from the red giant branch tip

Authors

  • L. Monaco,

    1. INAF – Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34131, Trieste, Italy
    2. INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy
    3. Università di Bologna – Dipartimento di Astronomia, via Ranzani 1, 40127, Bologna, Italy
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  • M. Bellazzini,

    Corresponding author
    1. INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy
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  • F.R. Ferraro,

    Corresponding author
    1. Università di Bologna – Dipartimento di Astronomia, via Ranzani 1, 40127, Bologna, Italy
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  • E. Pancino

    Corresponding author
    1. INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy
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E-mail: lmonaco@ts.astro.it (LM); michele.bellazzini@bo.astro.it (MB); francesco.ferraro3@unibo.it (FRF); elena.pancino@bo.astro.it (EP)

ABSTRACT

We derived the distance to the central region of the Sagittarius (Sgr) dwarf spheroidal galaxy from the red giant branch tip. The obtained distance modulus is (mM)0= 17.10 ± 0.15, corresponding to a heliocentric distance D= 26.30 ± 1.8 Kpc. This estimate is in good agreement with the distance obtained from RR Lyrae (RR Ly) stars of the globular cluster M 54, located in the core of the Sgr galaxy, once the most accurate estimate of the cluster metallicity and the most recent calibration of the MV(RR Ly) versus [Fe/H] relation are adopted.

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