Erratum: VERITAS deep observations of the dwarf spheroidal galaxy Segue 1 [Phys. Rev. D 85, 062001 (2012)]

Figure 1

Upper limits for the velocity-weighted annihilation cross section, $⟨\sigma \nu ⟩$, with 95% C.L. as a function of WIMP particle mass for different end state particles. The gray band represents a range of generic values for the annihilation cross section in the case of thermally produced dark matter. Left: Hadronic channels $b\overline{b}$, $W^{+}{W}^{-}$ and ${\tau }^{+}{\tau }^{-}$. Right: Leptonic channels of $e^{+}{e}^{-}$ and ${\mu }^{+}{\mu }^{-}$.

Figure 2

The 95% C.L. lower limits from the VERITAS observations of Segue 1 on the decay lifetime as a function of the dark matter particle mass. Left: Bosonic dark matter decaying to two identical particles: $b\overline{b}$, $W^{+}{W}^{-}$, ${\tau }^{+}{\tau }^{-}$, $e^{+}{e}^{-}$ and ${\mu }^{+}{\mu }^{-}$. The black star and the black cross denote the best fits to the Fermi and PAMELA data considering the ${\mu }^{+}{\mu }^{-}$ and ${\tau }^{+}{\tau }^{-}$ channels, respectively, and are taken from [2]. Right: Fermionic dark matter decaying to two different particles: $W^{\pm }{l}^{\pm }$ (where $l=e$, $\mu$, $\tau$ ) and $Z^0\nu$. The black triangle indicates the best fit to the Fermi and PAMELA data considering the channel $W^{\pm }{\mu }^{\pm }$, taken from [2].

Figure 3

The 95% C.L. exclusion curves from the VERITAS observations of Segue 1 on $⟨\sigma \nu ⟩/\overline{S}$ as a function of the dark matter particle mass, in the framework of two models with a Sommerfeld enhancement. The expected Sommerfeld enhancement $\overline{S}$ applied to the particular case of Segue 1 has been computed assuming a Maxwellian dark matter relative velocity distribution. The grey band area represents a range of generic values for the annihilation cross section in the case of thermally produced dark matter. Left: Model I (see [3] for details) with winolike neutralino dark matter annihilating to a pair of $W^{+}{W}^{-}$ bosons. Right: Model II (see [4] for details) with a 250 MeV scalar particle decaying into either $e^{+}{e}^{-}$ or ${\mu }^{+}{\mu }^{-}$.

Figure 4

The 95% C.L. exclusion limits on the overall boost factor $B_F$ as a function of the dark matter particle mass from the VERITAS observations of Segue 1, assuming that the dark matter particles annihilate exclusively into ${\mu }^{+}{\mu }^{-}$. The shaded areas are the $2\sigma$ contours derived from the fit to the HESS, PAMELA and Fermi-LAT data. The black dot is an example of a model that simultaneously fits well the HESS, PAMELA and Fermi-LAT data. See [5] for further details.