17 The Atomic Nature of Matter
... 17.5 Molecules Matter that is a gas or liquid at room temperature is usually made of molecules. Matter made of molecules may contain all the same kind of molecule, or it may be a mixture of different kinds of molecules. Purified water contains almost entirely H2O molecules, but clean air contains mo ...
... 17.5 Molecules Matter that is a gas or liquid at room temperature is usually made of molecules. Matter made of molecules may contain all the same kind of molecule, or it may be a mixture of different kinds of molecules. Purified water contains almost entirely H2O molecules, but clean air contains mo ...
The MAGNUM survey: positive feedback in the nuclear region of
... interstellar absorption. The fit is expected to be definitely degenerate in terms of the possible linear combinations of SSPs, but this is irrelevant to our goal: a realistic model of the star formation history and metallicity distribution is not required to ensure just an accurate stellar continuum ...
... interstellar absorption. The fit is expected to be definitely degenerate in terms of the possible linear combinations of SSPs, but this is irrelevant to our goal: a realistic model of the star formation history and metallicity distribution is not required to ensure just an accurate stellar continuum ...
Importance of the bonus lines (depends on excitation)
... and IC 342, M82 presents systematically low abundances of the molecules NH3 , CH3 OH, CH3 CN, HNCO, and SiO (Mauesberger & Henkel 1989, A&A 223, 79; Weiss et al. 2001, ApJ 554, L143). 2.- Wolfire et al. (1990, ApJ 358, 116) modeled the C II , Si II , and O I emission and estimateda UV field of G0 =1 ...
... and IC 342, M82 presents systematically low abundances of the molecules NH3 , CH3 OH, CH3 CN, HNCO, and SiO (Mauesberger & Henkel 1989, A&A 223, 79; Weiss et al. 2001, ApJ 554, L143). 2.- Wolfire et al. (1990, ApJ 358, 116) modeled the C II , Si II , and O I emission and estimateda UV field of G0 =1 ...
Diapositiva 1
... of baryonic matter if thermal energy deposition rate per unit solid angle sufficiently large. -rays produced in internal shocks when blobs of ultra-relativistic matter in the jet collide with each other. When the jet hits the ISM, the afterglow is produced ...
... of baryonic matter if thermal energy deposition rate per unit solid angle sufficiently large. -rays produced in internal shocks when blobs of ultra-relativistic matter in the jet collide with each other. When the jet hits the ISM, the afterglow is produced ...
GAS KINEMATICS ON GMC SCALES IN M51 WITH PAWS: CLOUD
... without streaming go on to efficiently form stars. We argue that this is the result of reduced surface pressure felt by clouds embedded in an ambient medium undergoing large streaming motions, which prevents collapse. Indeed, the variation in gas depletion time expected based on the observed streami ...
... without streaming go on to efficiently form stars. We argue that this is the result of reduced surface pressure felt by clouds embedded in an ambient medium undergoing large streaming motions, which prevents collapse. Indeed, the variation in gas depletion time expected based on the observed streami ...
Nuclear Astrophysics
... compared to the lifetimes of 12C and 14N to destruction by protons. In other words, as soon as a 12C + p (or 14N + p) reaction creates 13N (15O) , the newly produced 13N (15O) basically decay before the next new 13N (15O) is made. In this limiting case, the 13N and 15O abundances will quickly reach ...
... compared to the lifetimes of 12C and 14N to destruction by protons. In other words, as soon as a 12C + p (or 14N + p) reaction creates 13N (15O) , the newly produced 13N (15O) basically decay before the next new 13N (15O) is made. In this limiting case, the 13N and 15O abundances will quickly reach ...
Ultra faint dwarfs: probing early cosmic star formation
... formation. During reionization (6 < z < 9) the interplay between these two feedback types is quite complicated and no consensus is found on the evolution of Msf (z) (see for example Fig. 25 of Ciardi & Ferrara 2005). Instead of modeling in detail the build-up of LW and ionizing UV backgrounds, we in ...
... formation. During reionization (6 < z < 9) the interplay between these two feedback types is quite complicated and no consensus is found on the evolution of Msf (z) (see for example Fig. 25 of Ciardi & Ferrara 2005). Instead of modeling in detail the build-up of LW and ionizing UV backgrounds, we in ...
Star Formation in Disks: Spiral Arms, Turbulence, and Triggering
... results in the dense gas. Spiral density waves in the stars and stellar bars can do this, as mentioned in the previous section. Among the various sources of ISM energy, we include supernovae, HII regions and stellar winds as stellar sources, and galaxy rotation as an energy source for the magnetic fi ...
... results in the dense gas. Spiral density waves in the stars and stellar bars can do this, as mentioned in the previous section. Among the various sources of ISM energy, we include supernovae, HII regions and stellar winds as stellar sources, and galaxy rotation as an energy source for the magnetic fi ...
Module P8.2 Atomic spectra and the hydrogen atom
... Figure 2 (a) What happens when a parallel beam of yellow sodium light is shone on to a diffraction grating? When the light emerges from the grating it does not produce broad bands of light in each order, corresponding to the full range of yellow light (580 nm to 600 nm), but rather lines at definite ...
... Figure 2 (a) What happens when a parallel beam of yellow sodium light is shone on to a diffraction grating? When the light emerges from the grating it does not produce broad bands of light in each order, corresponding to the full range of yellow light (580 nm to 600 nm), but rather lines at definite ...
Colliding molecular clouds in head
... kpc away and at the systemic velocity of the UGC 813/6 pair, about 5200 km s−1 . Following Condon et al. (2002) we use the optical convention (v = cz) for all velocities. The atomic hydrogen (Hi) column densities are extremely high in the bridge region, reaching about 3 × 1021 cm−2 . Two Hi peaks, H ...
... kpc away and at the systemic velocity of the UGC 813/6 pair, about 5200 km s−1 . Following Condon et al. (2002) we use the optical convention (v = cz) for all velocities. The atomic hydrogen (Hi) column densities are extremely high in the bridge region, reaching about 3 × 1021 cm−2 . Two Hi peaks, H ...
Spectra of Cosmic Ray Protons and Helium Produced in Supernova
... cosmic ray halo boundaries into intergalactic space, where cosmic ray density is negligible. We employ the plain diffusion model with a flat cosmic ray halo (Ginzburg & Ptuskin 1976; Strong et al. 2007) for calculations of cosmic ray propagation in the Galaxy. The leaky-box approximation to the diff ...
... cosmic ray halo boundaries into intergalactic space, where cosmic ray density is negligible. We employ the plain diffusion model with a flat cosmic ray halo (Ginzburg & Ptuskin 1976; Strong et al. 2007) for calculations of cosmic ray propagation in the Galaxy. The leaky-box approximation to the diff ...
Astronomy Astrophysics
... obviously reduced if grains are destroyed in the strong shocks generated in cloud collisions (whether in atomic or molecular clouds). There is a further reason for why clouds which are not initially dense will not be able to contract. In both systems, and particularly the Taffy galaxies, the spirals ...
... obviously reduced if grains are destroyed in the strong shocks generated in cloud collisions (whether in atomic or molecular clouds). There is a further reason for why clouds which are not initially dense will not be able to contract. In both systems, and particularly the Taffy galaxies, the spirals ...
Atoms are the building blocks of most matter.
... All of the matter that we encounter in our daily lives, as well as matter in the sun and other stars, is made up of elements. Twenty-three percent of the matter in the universe is composed of an unseen dark matter. Astrophysicists believe this dark matter is made up of particles not yet detected. Wh ...
... All of the matter that we encounter in our daily lives, as well as matter in the sun and other stars, is made up of elements. Twenty-three percent of the matter in the universe is composed of an unseen dark matter. Astrophysicists believe this dark matter is made up of particles not yet detected. Wh ...
Interactions of Ammonia with a NiO( 100) Surface
... calculation based on thermal desorption analysis. Their results showed that Ed decreases significantly with increasing ammonia coverage. The variation of Ed as a function of NH3 coverage was interpreted to be due to repulsive lateral interactions between neighboringNH3 dipoles. These results are not ...
... calculation based on thermal desorption analysis. Their results showed that Ed decreases significantly with increasing ammonia coverage. The variation of Ed as a function of NH3 coverage was interpreted to be due to repulsive lateral interactions between neighboringNH3 dipoles. These results are not ...
Microplasma
Microplasmas are plasmas of small dimensions, ranging from tens to thousands of micrometers. They can be generated at a variety of temperatures and pressures, existing as either thermal or non-thermal plasmas. Non-thermal microplasmas that can maintain their state at standard temperatures and pressures are readily available and accessible to scientists as they can be easily sustained and manipulated under standard conditions. Therefore, they can be employed for commercial, industrial, and medical applications, giving rise to the evolving field of microplasmas.