It had to be at a high galactic latitude, because infrared'cirrus', the diffuse, wispy infrared emission believed to be caused by warm dust grains in cool clouds of hydrogen gas ( H I regions ).
12.
While the high Galactic latitudes covered by the LAS make it suitable for observations of sources outside the Milky Way, the survey also targets Galactic sources, incorporating a second pass in J to measure proper motions of nearby stars.
13.
The anisotropy of the star density in the night sky makes the galactic coordinate system very useful for coordinating surveys, both those that require high densities of stars at low galactic latitudes, and those that require a low density of stars at high galactic latitudes.
14.
The anisotropy of the star density in the night sky makes the galactic coordinate system very useful for coordinating surveys, both those that require high densities of stars at low galactic latitudes, and those that require a low density of stars at high galactic latitudes.
15.
The details of the analysis is as follows : A sample of 6 gamma-ray faint NS sources not reported in the first Fermi gamma-ray source catalog that are good candidates are selected for this analysis, based on age, surface magnetic field, distance, and galactic latitude.
16.
The DXS ( extra-Galactic ) covers an area of 35 square degrees in JK to a depth of K = 21.0 with 5 square degrees also imaged in H . The survey fields are at high Galactic latitudes with low extinction, and are chosen to overlap with deep observations made at other wavelengths.
