搜索结果: 1-6 共查到“星系与宇宙学 C:N ratio”相关记录6条 . 查询时间(0.035 秒)
Luminous Infrared Galaxies with the Submillimeter Array. I. Survey Overview and the Central Gas to Dust Ratio
infrared individual
2014/12/23
We present new data obtained with the Submillimeter Array for a sample of 14 nearby luminous and ultraluminous infrared galaxies. The galaxies were selected to have distances DL < 200 Mpc and far-infr...
Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C*
gas dust
2014/12/22
We present Herschel/HIFI observations of the fundamental rotational transitions of ortho- and para-H216O and H218O in absorption towards Sagittarius B2(M) and W31C. The ortho/para ratio in water in th...
On the prior dependence of constraints on the tensor-to-scalar ratio
infl ation, primordial gravitational waves (theory), cosmological parameters from CMBR
2011/10/9
We investigate the prior dependence of constraints on cosmic tensor perturbations. Commonly imposed is the strong prior of the single-field inflationary consistency equation, relating the tensor spect...
On the Lx-L6micron ratio as a diagnostic for Compton-thick AGN
X-rays: general X-rays: di use background X-rays: galaxies Infrared: galaxies
2011/10/11
As the mid-IR luminosity represents a good isotropic proxy of the AGN power, a low X-ray to mid-IR luminosity ratio is often claimed to be a reliable indicator for selecting Compton-thick (CT) AGN. We...
Stellar mass-to-light ratio gradients in galaxies: correlations with mass
dark matter – galaxies : evolution – galaxies : galaxies : general –galaxies : elliptical and lenticular, cD.
2011/10/9
We analyze the stellar mass-to-light ratio (M/L) gradients in a large sample of local galaxies taken from the Sloan Digital Sky Survey, spanning a wide range of stellar masses and morphological types....
Narrow-line seyfert 1 galaxies：the [O III] λ5007/Hβ ratio and photoionization models for the nlr
seyfert 1 galaxies photoionization models λ5007/Hβ ratio
2009/6/5
Narrow-line seyfert 1 galaxies：the [O III] λ5007/Hβ ratio and photoionization models for the nlr。