GD-1: The Relic of an Old Metal-poor Globular Cluster

Li, Guang -Wei; Yanny, Brian; Wu, Yue

doi:10.3847/1538-4357/aaed29

GD-1: The Relic of an Old Metal-poor Globular Cluster

Journal Article · Tue Dec 18 00:00:00 EST 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aaed29· OSTI ID:1498554

^[1]; ^[2]; Wu, Yue ^[1]

Chinese Academy of Sciences (CAS), Beijing (China)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Combining data from Gaia DR2, SDSS DR14 and LAMOST DR6, we update the fit tomodel of the properties of the stellar stream GD-1 and find that it has an ageof $$\sim 13$$ Gyr, [Fe/H] of $$-2.2\pm 0.12$$, and a distance from the sun of $$\sim 8$$ kpc. We tabulate 6D phase-space fiducial points along the GD-1 streamorbit over a 90$$^\circ$$ arc. The fitted orbit shows that the stream has aneccentricity $$e \sim 0.3$$, perigalacticon of 14.2 kpc, apogalacticon of 27.0 kpc and inclination $$i \sim 40^{\circ}$$. There is evidence along the arc for 4candidate stellar overdensities, one candidate gap, two candidate stellarunderdensities and is cut off at $$\phi_1 \sim 2^{\circ}$$ (in the stream-aligned$$(\phi_1,\phi_2)$$ coordinate system. The spur originating at $$\phi_1 \sim -40^{\circ}$$ implies stars were pulled away from the stream traceby an encounter (potentially a dark matter subhalo). The narrowest place ( FWHM$$\sim 44.6$$ pc) of the GD-1 trace is at $$(\phi_1, \phi_2^c) \sim (-14^{\circ},0.15^{\circ})$$, which is $$\sim (178.18^{\circ}, 52.19^{\circ})$$ in (R. A.,Decl.), where the progenitor is possibly located. In conclusion, we also find six BHB and 10BS spectroscopic stars in the GD-1 stream.

View Accepted Manuscript (DOE)

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1498554

Report Number(s):: FERMILAB-PUB--18-746-CD; arXiv:1811.06427; 1722223

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 869; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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