Table 1
Observed and derived parameters of Sextans A.
| Parameter | Value | Notes |
|
|
||
| α 0 | 10:11:00.1 | J2000a |
| δ 0 | −04:41:42.6 | J2000a |
| l 0 | 246.15° | Gal. long. |
| b 0 | 39.87° | Gal. lat. |
| SGL | 109.00° | Supergal. long. |
| SGB | −40.66° | Supergal. lat. |
| E(B − V) | 0.035 ± 0.002 | Average ± σb |
| (m − M)0 | 25.77 ± 0.12 | |
| D | 1.42 ± 0.08 Mpc | |
| 1 arcsec | 6.9 pc | conv. factor at D=1.42 Mpc |
| V h | 324 ± 1 km s-2 | heliocentric velocityc |
| V g | 163 km s-1 | galactocentric velocityc |
| ⟨[Fe/H] ⟩ | −1.45 | from RGB colourd |
| ϵ | 0.0 | adopted |
| PA | 0° | adopted |
| μV(0) | 23.9 ± 0.1 mag/arcsec2 | central SBe |
| h | 2.5′ | Sérsic scale radius |
| r h | 1.8′ | Observedf |
| V tot | 11.7 ± 0.2 | Observedf |
| M V | −14.2 ± 0.3 | |
| L V |
|
total V luminosity |
| M HI | 6.2 × 107 M⊙ | gaseous massg |
| M dyn | ~ 1 × 109 M⊙ | total massh |
Notes.
Averaged over the whole FoV from the reddening maps by Schlegel et al. (1998), as re-calibrated by Schlafly & Finkbeiner (2011).
From McConnachie (2012).
From synthetic CMD fit on HST photometry by Dolphin et al. (2003).
Average of μV for Rϵ< 1.8′. Not corrected for extinction. The μV(0) values extrapolated from fits with not fully adequate models (e.g. exponential models) can differ significantly from this observed value.
From Ott et al. (2012).
See Sect. 5.
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