We have acquired imaging of the bipolar outflow M2-9 in the transitions [O III] λ5007, H I λ6563, [N II] λ6584, and [S II] λλ6717, 6731. As a result, we are...
Density biases and temperature relations for DESIRED H II regions
We present a first study based on the analysis of the DEep Spectra of Ionized REgions Data base (DESIRED). This is a compilation of 190 high signal-to-noise...
Density bounding of giant HII regions and the ionization of the diffuse interstellar medium
Three different types of evidence are presented in favour of the hypothesis that the HII regions in disk galaxies with H-alpha luminosities greater than a...
Density discrepancy between transit-timing variations and radial velocity: Insights from the host star composition
Context. The determination of planetary densities from the masses derived with the radial velocity (RV) and transit-timing variation (TTV) methods reveals...
Density distribution of the cosmological matter field
The one-point probability distribution function (PDF) of the matter density field in the universe is a fundamental property that plays an essential role in...
Density studies on giant extragalactic H II regions
We report the results of a systematic study on the spatial variation of the electron density in a selected group of bright giant H II complexes in the galaxies...
Density waves and star formation in grand-design spirals
Context. H II regions in the arms of spiral galaxies are indicators of recent star-forming processes. They may have been caused by the passage of the density...
Density weighted angular redshift fluctuations: a new cosmological observable
We propose the use of angular fluctuations in the galaxy redshift field as a new way to extract cosmological information in the Universe. This new probe $\delta...
Density, not radius, separates rocky and water-rich small planets orbiting M dwarf stars
Exoplanets smaller than Neptune are common around red dwarf stars (M dwarfs), with those that transit their host star constituting the bulk of known temperate...