II/249 WHAM Northern Sky Survey, V-1.1 (Haffner+, 2003)
The Wisconsin H-Alpha Mapper Northern Sky Survey
Haffner L.M., Reynolds R.J., Tufte S.L., Madsen G.J., Jaehnig K.,
Percival J.W.
<Astrophys. J. Suppl. Ser. 149, 405 (2003)>
=2003ApJS..149..405H 2003ApJS..149..405H
ADC_Keywords: Surveys ; Photometry, H-alpha
Keywords: Galaxy: halo - H II regions - ISM: atoms - ISM: structure
Description:
The Wisconsin H-Alpha Mapper has been designed to produce a survey of
H-Alpha emission from the interstellar medium (ISM) over the entire
northern sky. The instrument combines a 0.6 meter telescope and a
dual-etalon 15cm Fabry-Perot spectrometer. In the primary spectral
mode, an exposure captures a 200km/s spectral region with 8-12km/s
velocity resolution from a one-degree beam on the sky. With a
large-aperture design and modern CCD technology, WHAM can detect
Galactic emission as faint as 0.05 Rayleighs in a 30 second exposure.
For gas at 10000K, this observed intensity corresponds to an emission
measure of about 0.1cm-6pc, more than 10 million times fainter than
the Orion Nebula.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 60 37565 WHAM Northern Sky Survey - V 1.1
wham-11.fit 2880 16400 *FITS version of the catalog
--------------------------------------------------------------------------------
Note on wham-11.fit: this file includes the array of 101 intensities
for the velocity range
--------------------------------------------------------------------------------
See also:
http://www.astro.wisc.edu/wham/ : WHAM Home Page
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 10 F7.3 deg GLON Galactic Longitude
14- 20 F7.3 deg GLAT Galactic Latitude
24- 30 F7.3 2.4x10-7mW/m2/sr IHa Hα intensity (1)
36- 40 F5.3 2.4x10-7mW/m2/sr e_IHa Standard error of the intensity (1) (2)
47- 50 I4 -- Block Block designation of observation (3)
53- 60 F8.3 2.4x10-7mW/m2/sr Iori Original Intensity (4)
--------------------------------------------------------------------------------
Note (1): 1 Rayleigh = 10+6/(4*pi)photons/cm2/s/sr
= 2.4x10-7erg/cm2/s/sr at Hα.
Note (2): Formal propagation only. This error does not reflect
systematic issues discussed int the text. If listed as zero, the
original observation is likely contaminated by a bright star (see
text). The intensity listed in IHa is then an average of the nearest
neighbors within one degree of the original.
Note (3): The numeric block designation for this observation.
Blocks of data are taken sequentially in time and are physically close
on the sky (see text). Systematics remaining in the data are thus
often linked to this parameter.
Note (4): If column 3 represents the average of nearest neighbors
(e_IHa=0; see Note 2), this column contains the original (unmodified)
intensity for reference.
--------------------------------------------------------------------------------
Acknowledgements: L.M. Haffner
(End) Patricia Bauer [CDS] 02-Aug-2003