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The revised distance to NGC 55

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Presentation on theme: "The revised distance to NGC 55"— Presentation transcript:

1 The revised distance to NGC 55
The revised distance to NGC 55 G. C. Van de Steene (ROB) G. H. Jacoby (WIYN) C. Praet (U. Gent) H. Dejonghe (U. Gent) Seattle, APN

2 NGC 55 SB(s)m Sculptor Group i = 85° Vhelio 111 km/s
NGC 55 SB(s)m Sculptor Group i = 85° Vhelio 111 km/s R ′9 =8.8 kpc M0B DSS ESO, PNe beyond the MW Seattle, APN

3 Data WFI at ESO 2.2 m telescope July 1999. FOV 34'. Seeing ~1.5".
Data WFI at ESO 2.2 m telescope July 1999. FOV 34'. Seeing ~1.5". OIII/ % 2h35min 518/ h20min Hα/ % 3h Reduced with the mscred package in iraf PNe by blinking Point sources, [OIII]>Hα, no continuum ESO, PNe beyond the MW Seattle, APN

4 PNe Candidates 2004-05-19 ESO, PNe beyond the MW 2003-08-29
Seattle, APN

5 PNLF distance 2.6 +/- 0.4 Mpc 2004-05-19 ESO, PNe beyond the MW
PNLF distance 2.6 +/- 0.4 Mpc ESO, PNe beyond the MW Seattle, APN

6 Distance determinations to NGC 300 and NGC 55
Distance determinations to NGC 300 and NGC 55 PNe PNe PNe PNe Cep SG TF TF SG ESO, PNe beyond the MW Seattle, APN

7 The Sculptor Group Karachentsev et al. 2003 2004-05-19
The Sculptor Group Karachentsev et al. 2003 ESO, PNe beyond the MW Seattle, APN

8 Distances Structure + Karachentsev et al. 2003 2004-05-19
Distances Structure + ESO, PNe beyond the MW Karachentsev et al. 2003 Seattle, APN

9 Conclusions We found 21 PNe candidates in NGC 55
Conclusions We found 21 PNe candidates in NGC 55 2.0 < DistNGC55 < 2.6 Mpc +/- 0.4 Mpc It probably forms a pair with NGC 300 and E may be an isolated dwarf galaxy. NGC55 needs a better determined distance. ESO, PNe beyond the MW Seattle, APN


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