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Article overview
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GHIGLS: HI mapping at intermediate Galactic latitude using the Green Bank Telescope | P. G. Martin
; K. P. M. Blagrave
; D. Pinheiro Goncalves
; Felix J. Lockman
; A. I. Boothroyd
; M.-A. Miville-Deschenes
; G. Joncas
; G. Stephan
; | Date: |
29 Apr 2015 | Abstract: | This paper introduces the data cubes from GHIGLS, our deep Green Bank
Telescope surveys of the 21-cm line emission of HI in targeted fields at
intermediate Galactic latitude. The GHIGLS fields together cover over 800
square degrees at 9.55’ spatial resolution. The HI spectra have an effective
velocity resolution about 1.0 km/s and cover at least -450 < v < +250 km/s.
GHIGLS highlights that even at intermediate Galactic latitude the interstellar
medium is very complex. Spatial structure of the HI is quantified through power
spectra of maps of the column density, NHI. For our featured representative
field, centered on the North Ecliptic Pole, the scaling exponents in power-law
representations of the power spectra of NHI maps for low, intermediate, and
high velocity gas components (LVC, IVC, and HVC) are -2.90 +/- 0.03, -2.55 +/-
0.04, and -2.66 +/- 0.06, respectively. After Gaussian decomposition of the
line profiles, NHI maps were also made corresponding to the broad and narrow
line components in the LVC range; for these maps the exponents are -2.8 +/- 0.1
and -2.2 +/- 0.2, respectively, the latter revealing more small scale structure
in the cold neutral medium (CNM). There is evidence that filamentary structure
in the HI CNM is oriented parallel to the Galactic magnetic field. The power
spectrum analysis also offers insight into the various contributions to
uncertainty in the data. The effect of 21-cm line opacity on the GHIGLS NHI
maps is estimated. | Source: | arXiv, 1504.7723 | Services: | Forum | Review | PDF | Favorites |
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