Mapping the anisotropic Galactic stellar halo with blue horizontal branch stars

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Volume 690 (October 2024)

A&A, 690 (2024) A166

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Table 1.

Galactic coordinates and heliocentric distance used in this work for Hecules-Aquila Cloud North and South (HAC-N and HAC-S, Belokurov et al. 2007a; Watkins et al. 2009; Sesar et al. 2010; Simion et al. 2014), Virgo OverDensity (VOD, Jurić et al. 2008; Bonaca et al. 2012), and Pisces (Nie et al. 2015; Belokurov et al. 2019).

Name	(l, b) [deg]	d_⊙ [kpc]	r_br [kpc]	(α_in, α_out)
HAC-S	30 ° < l < 60 ° , − 45 ° < b < −20°	10–20	$24 . 8_{- 1.0}^{+ 0.8}$ $24.8^{+0.8}_{-1.0}$	$(- 3 . 0_{- 0.1}^{+ 0.1}, - 5 . 3_{- 0.2}^{+ 0.2})$ $(-3.0^{+0.1}_{-0.1}, -5.3^{+0.2}_{-0.2})$
HAC-N	30 ° < l < 60 ° ,20 ° < b < 45°	10–20	$22 . 3_{- 1.2}^{+ 1.3}$ $22.3^{+1.3}_{-1.2}$	$(- 2 . 8_{- 0.2}^{+ 0.2}, - 5 . 7_{- 0.3}^{+ 0.3})$ $(-2.8^{+0.2}_{-0.2}, -5.7^{+0.3}_{-0.3})$
VOD	270 ° < l < 330 ° , − 45 ° < b < −20°	10–20	$22 . 4_{- 3.4}^{+ 3.6}$ $22.4^{+3.6}_{-3.4}$	$(- 2 . 8_{- 0.3}^{+ 0.4}, - 4 . 2_{- 0.2}^{+ 0.2})$ $(-2.8^{+0.4}_{-0.3}, -4.2^{+0.2}_{-0.2})$
Pisces	(74 ° , − 47 ° )	60–100	–	$(- 3 . 8_{- 2.5}^{+ 0.7}, - 3 . 8_{- 0.3}^{+ 0.2})$ $(-3.8^{+0.7}_{-2.5}, -3.8^{+0.2}_{-0.3})$

Notes. For the latter, we indicate the centre of a 20° region satisfying the regions associated with Pisces as in Belokurov et al. (2019) and Conroy et al. (2021). We also show the slopes and break radius, r_br, of a two-power law fit of these regions obtained in this work. For comparison, the average profile within the whole LSDR9 footprint has $r_{br} = 19 . 1_{- 1.8}^{+ 1.7}$ $r_{\mathrm{br}} = 19.1^{+1.7}_{-1.8}$ kpc and $(α_{in}, α_{out}) = (- 2 . 9_{- 0.1}^{+ 0.2}, - 4 . 5_{- 0.1}^{+ 0.1})$ $(\alpha_{\mathrm{in}}, \alpha_{\mathrm{out}}) = (-2.9^{+0.2}_{-0.1}, -4.5^{+0.1}_{-0.1})$ .

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