A Cold Stellar Stream in Pegasus. (arXiv:1903.08840v1 [astro-ph.GA])

A Cold Stellar Stream in Pegasus. (arXiv:1903.08840v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Perottoni_H/0/1/0/all/0/1">H. D. Perottoni</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martin_C/0/1/0/all/0/1">C. Martin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Newberg_H/0/1/0/all/0/1">H. J. Newberg</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rocha_Pinto_H/0/1/0/all/0/1">H. J. Rocha-Pinto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Almeida_Fernandes_F/0/1/0/all/0/1">F. de Almeida-Fernandes</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gomes_Junior_A/0/1/0/all/0/1">A. R. Gomes-Junior</a>

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
color–magnitude diagram that is optimised 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 (turnoff point at $r_0 sim$ 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 $(u-g)_0$, $(g-r)_0$
color–color 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$^circ$ (2.5 kpc), with a width of 112 pc. The
narrow width suggests a globular cluster progenitor.

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