Table 1.
Properties of VV 655 and NGC 4418.
| VV 655 |
NGC 4418 |
||||
|---|---|---|---|---|---|
| Observed property | Measured | Physical | Measured | Physical | Notes |
| RA (J2000) | 12h27m04 56 |
12h26m54 62 |
(a) | ||
| Dec (J2000) | −00d54m23 2 |
−00d52m39 4 |
(a) | ||
| Redshift | 2202 km s−1 | 34 Mpc | 2106 km s−1 | 34 Mpc | (b) |
| Far-UV Mag. | 16.8 | 4 × 1042 erg s−1 | ... | ... | (c) |
| 3.6 μm Mag. | 12.5 | 2.4 × 109 L⊙ | 9.9 | 2.7 × 1010 L⊙ | (d) |
| HI Mass | 1 × 109 M⊙ | M(HI)/M* ≈ 1/2 | ... | ... | (e) |
| RP(r) | 18″ | 3.0 kpc | 27″ | 4.3 kpc | (f) |
| vrot | 20 km s−1 | 30−90 km s−1 | 130 km s−1 | 150 km s−1 | (g) |
| SFR | ∼0.1 M⊙ yr−1 | ∼3.2 M⊙ yr−1 | (h) | ||
Notes. (a)From the NASA/IPAC Extragalactic Database (NED; https://ned.ipac.caltech.edu/). (b)Systemic HI velocity from Varenius et al. (2017). (c)From GALEX archival images, this paper; NGC 4418 is on the edge of the GALEX field of view and thus its FUV magnitude is not given. (d)From Spitzer archival images, this paper. (e)HI mass from Varenius et al. (2017), measured over the region shown in their Fig. 5; the HI content of NGC 4418 is not well determined due to HI absorption. Stellar mass from L3.6 assuming M/L = 1. (f)r-band Petrosian radius from SDSS-III DR 12. (g)From Varenius et al. (2017) and this paper (VV 655) and Ohyama et al. (2019; NGC 4418). (h)From Varenius et al. (2017), as derived from the 1.4 GHz continuum, and this paper.
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