Possible ISO Polarimetry Targets
Our two favorite sources now are Ophiuchus (mostly the core region),
which is discussed & documented in our original proposal, and should
still be observed if practical, and NGC1333, which is discussed below.
Both of these sources contain moderately bright embedded clusters, which
should heat the dust and give it a better chance of aligning.
Below, please examine the two maps of NGC1333. They both show IRAS
100 micron maps, one in 1950 coordiinates (for overlay with literature
references) and one in 2000 coordinates, for ISO reference.
AG suggests that we target a region centered on Akeson et al.'s mm peak
(which is at 3h26m5s, 31deg 03' 14" (1950)). Akeson et al (1996, ApJLetters,
456, L45) find polarization which peaks at about 8% for 3 mm emission.
We should aim to sample:
- the Akeson et al. postion
- as many neighboring positions as is practical, including those
along the direction of the outflow in NGC1333 (N-S near the source, but
45deg on larger scales... see Blake et al. 1995, ApJ, 441, 689).
Also:
- One or more of the Hildebrand et al "calibration" (bright)
extended sources should also be observed, separated by as many months
as possible.
- An "off" position for each source. "Offs"
for Ophiuchus are given in the original proposal. Offs for NGC1333 need
to be identified (by Rene?), based on quantitative examination of maps
like the ones shown below. IRSKY can be used to find low points near the
peaks, and the "background" or "off" positions will
be much fainter than the source for NGC1333.
IRAS 100 micron image (1950 coords)
IRAS 100 micron image (2000 coords)
- Image size(degrees): 4.00000 x 4.00000
- Image size(pixels): 300 x 300
- Requested Center: ngc1333
- Center(degrees): 52.2566, 31.3485
- Coordinate System: Equatorial
- Map projection: Gnomonic
- Equinox: 2000.00
