Learn More
A large portion of the Galaxy (ℓ = 123 • to 164 • , b = −6 • to −35 •), which samples regions of the Local (Orion) spiral arm and the more distant Perseus arm, has been mapped with the Wisconsin H-Alpha Mapper (WHAM) in the [S II] λ6716 and [N II] λ6583 lines. By comparing these data with the maps from the WHAM Hα Sky Survey, we begin an investigation of(More)
The Wisconsin H-Alpha Mapper (WHAM) has completed a survey in Balmer α of the entire Northern sky above declination −30 •. This survey provides the first calibrated, velocity-resolved map of the Hα emission from the Galaxy. With one-degree spatial resolution, 12 km s −1 velocity resolution, and sensitivity to features as faint as 0.1 R (EM ∼ 0.2 cm −6 pc),(More)
The extremely faint, temperature sensitive " auroral " emission line [N II] λ5755 has been detected from the low density ionized gas along the sight line toward l = 130. o 0, b = −7. o 5 using the Wisconsin Hα Mapper (WHAM). The intensity of this emission line, relative to the red nebular line [N II] λ6584, is found to be twice that observed in bright,(More)
The Wisconsin H-Alpha Mapper (WHAM) Northern Sky Survey is revealing that many intermediate-velocity (k m s Ϫ1) neutral clouds and complexes have an associated ionized component. We present the first Fv F ≤ 100 LSR map of the Ha emission from an intermediate-or high-velocity structure: Complex K. This large, high-latitude feature stretches from to 70Њ,t o(More)
The Wisconsin Hα Mapper (WHAM) Northern Sky Survey has revealed a loop of H II reaching 1300 pc from the Galactic midplane above the Cas OB6 association in the Perseus sprial arm. This enormous feature surrounds and extends far above the " W4 Chimney " identified by Normandeau et al. and appears to be associated with the star formation activity near the(More)
It has been suggested that high velocity clouds may be distributed throughout the Local Group and are therefore not in general associated with the Milky Way galaxy. With the aim of testing this hypothesis, we have made observations in the Hα line of high velocity clouds selected as the most likely candidates for being at larger than average distances. We(More)
The Wisconsin Hα Mapper (WHAM) is a new facility dedicated to the study of faint optical emission lines from diffuse interstellar gas. During its first 18 months of operation, WHAM carried out a survey of the interstellar Hα emission associated with the warm, ionized component of the interstellar medium. The observations consisted of 37,000 spectra obtained(More)
We have used the Wisconsin Hα Mapper (WHAM) facility to measure the interstellar Hα emission toward the high Galactic latitude O star HD 93521 (ℓ = 183. • 1, b = + 62. • 2). Three emission components were detected along this line of sight. These components have radial velocities of –10 km s −1 , – 51 km s −1 , and –90 km s −1 with respect to the local(More)