A cold stellar stream in Pegasus

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2019-01-01

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We report the serendipitous discovery of a stellar stream in the constellation Pegasus in the south Galactic hemisphere. The stellar stream was detected using the SDSS Data Release 14 by means of a matched filter in the colour-magnitude diagram that is optimized for a stellar population that is 8 Gyr old with [Fe/H] = -0.46 dex, and located at heliocentric distance of 18 kpc. The candidate stream is faint (turn-off point at r0 ∼19.6), sparse and barely visible in SDSS photometry. It is also detected in the (shallower) Pan-STARRs data. The residual stellar density in the (u - g)0, (g - r)0 colour-colour diagram gives the same estimate for the age and [Fe/H] of this stellar population. The stream is located at a Galactic coordinates (l, b) = (79.4°, -24.6°) and extends over 9° (2.5 kpc), with a width of 112 pc. The narrow width suggests a globular cluster progenitor.

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Monthly Notices of the Royal Astronomical Society, v. 486, n. 1, p. 843-850, 2019.

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