Table 2.
General parameters of NGC 5257 and NGC 5258.
| Parameter | NGC 5257 | NGC 5258 | Reference |
|---|---|---|---|
| Coordinates (J2000)a | α = 13h39m52.91s | α = 13h39m57.70s | … |
| δ = +00 ° 50′24.5″ | δ = +00 ° 49′51.1″ | … | |
| Morphological type | SABba | SBba | … |
| SAB(s)b pec HII LIRGb | SA(s)b:pec; HII LINERb | … | |
| SA(rs)b pec | SABb pec | 1 | |
| Heliocentric systemic | 6800 ± 4a,c | 6782 ± 9a,c | … |
| velocity (km s−1) | 6764d | 6765d | 2 |
| Redshiftb | 0.022676 | 0.022539 | … |
| Distance (Mpc) | 98.0 | 97.4 | 3 |
| 100.3e | 99.7e | … | |
| Morphological position anglea (°) | 83.1 | 178 | … |
| Morphological inclinationa (°) | 58 | 34 | … |
| mB (mag) | 11.23 | 14.05 | 1 |
| mR (mag) | 10.28 | 13.18 | 1 |
 (mag) |
10.084 ± 0.047 | 9.962 ± 0.039 | 4 |
| (B − I) | 1.59 | 1.47 | 1 |
g |
11.03 | 13.90 | 1 |
h |
0.51 | 0.42 | 1 |
| R25 = D25/2 in arcsec (kpc) | 53.3 (25.8) | 49.8 (24.1) | 5 |
| RK20 f in arcsec (kpc) | 29.9 (14.49) | 37.6 (18.22) | 4 |
| RHα i in arcsec (kpc) | 17.98 (8.71) | 18.04 (8.75) | … |
| Mean surface brightness | |||
| Within 25 isophote (mag/arcsec−2) | 22.74 | 23.26 | 1 |
| LHα (106 L⊙) | 5 | 6 | 6 |
| LIR (1011 L⊙) | 1.7 | For the whole pair | 7 |
| 2.7 | For the whole pair | 8 | |
| LFIR (1011 L⊙) | 1.7 | … | 9 |
| 2.0 | For the whole pair | 6 | |
| 1.5 | For the whole pair | 8 | |
| 2.0 | For the whole pair | 10 | |
| LIR/LB | 12.0 | For the whole pair | 7 |
| Maximum rotation velocity (km s−1) | 248 ± 10a | 387 ± 19a | … |
| 270j | 250j | 2 | |
| Dynamical mass (1011 M⊙) | 0.28k | 1.10k | 2 |
| Mass in HI (in 1010 M⊙) | 1.2 | 0.98 | 6 |
| 3.39 | For the whole pair | 2 | |
| Mass in H2 (in 1010 M⊙) | 1.32 | 2.40 | 2 |
| SFRl (M⊙ yr−1) | 27.8 | 24.9 | 2,11 |
Notes.
Derived from the maximum radial extent of the CO(1-0) emission: 4.7 kpc (0.18 R25) for NGC 5257, 12 kpc (0.50 R25) for NGC 5258, and the observed rotational velocity divided by sin90.
References. (1) Hernández-Toledo & Puerari (2001); (2) Iono et al. (2005); (3) Mould et al. (2000); (4) (Skrutskie et al. 2006); (5) de Vaucouleurs et al. (1991); (6) Sofue et al. (1993); (7) Bushouse et al. (1998); (8) Dopita et al. (2002); (9) Casasola et al. (2004); (10) Georgakakis et al. (2000); (11) Yun et al. (2001).
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