Using our interferometric angular diameter measurements of seven classical Cepheids reported in Kervella et al. (2003, Paper I), complemented by previously existing measurements, we derive new calibrations of the Cepheids Period–Radius (P–R) and Period–Luminosity (P–L) relations. We obtain a P–R relation of logR = [0.767 ± 0.009] logP + [1.091 ± 0.011], only 1σ away from the relation obtained b...

The stellar mass-to-light ratio gradient in SDSS $r-$band $\nabla (M_*/L_r)$ of a galaxy depends on its mass assembly history, which is imprinted morphology and gradients age, metallicity, initial function (IMF). Taking MaNGA sample 2051 galaxies with masses ranging from $10^9$ to $10^{12}M_\odot$ released DR15, we focus face-on galaxies, without merger bar signatures, investigate the dependenc...

The impact of cooling flows on the T X − L Bol relation for the most luminous clusters. ABSTRACT We examine the effects of cooling flows on the T X − L Bol relation for a sample of the most X-ray luminous (L Bol > 10 45 erg s −1) clusters of galaxies known. Using high-quality ASCA X-ray spectra and ROSAT images we explicitly account for the effects of cooling flows on the X-ray properties of th...

The impact of cooling flows on the T X − L Bol relation for the most X-ray luminous clusters. ABSTRACT We examine the effects of cooling flows on the T X − L Bol relation for a sample of the most X-ray luminous (L Bol > 10 45 erg s −1) clusters of galaxies known. Using high-quality ASCA X-ray spectra and ROSAT images we explicitly account for the effects of cooling flows on the X-ray properties...

We report 4.5 μm luminosities for 27 nearby (D . 5 Mpc) dwarf irregular galaxies measured with the Spitzer Infrared Array Camera. We have constructed the 4.5 μm luminosity-metallicity (L–Z) relation for 25 dwarf galaxies with secure distance and interstellar medium oxygen abundance measurements. The 4.5 μm L–Z relation is 12+log(O/H) = (5.78 ± 0.21) + (−0.122 ± 0.012) M[4.5], where M[4.5] is th...