Deep GLIMPSE: Exploring the Far Side of the Galaxy

Deep GLIMPSE

Exploring the Far Side of the Galaxy

A Spitzer Cycle 8 Exploration Science Program

The Deep GLIMPSE project was awarded 600 hours of priority 2 time and 200 hours of priority 3 time. The priority 2 time covers longitudes of 30 < l < 65, -30 > l > -95, with a latitude width of about 2.0 degrees. The priority 3 time includes re-observations of some of the original GLIMPSE survey at deeper exposures. The priority 3 areas observed are l=330 to 350 deg, b=-2.0 to 0.1 deg and l=25 to 30 deg, b=+0.5 to 2.7 deg.

Deep GLIMPSE Areal Coverage

The Deep GLIMPSE priority 2 & 3 AORs are overlayed over the GLIMPSE I, II, 3D and Vela Carina areal coverages. Solid Red are Deep GLIMPSE priority 2 areas observed as of 09-21-2012. Solid Blue are the Deep GLIMPSE priority 3 regions that have been observed. Blue/Red hatched areas are re-planned priority 2 areas. All areas have been observed.

Proposal Abstract

We propose to re-observe and enhance the original GLIMPSE survey region following the Galactic warp at a Galactocentric distance of 13 kpc to survey the far outer Galaxy. The new survey will cover longitudes of 15 < l < 65, -15 > l > -95, with a latitude width of 2.5 degrees; 55% of the survey will overlap with GLIMPSE, and 45% will cover new territory. The survey strategy of 3 HDR visits on each sky position will increase the dynamic range over GLIMPSE by a factor of 13 on the faint end and 3 on the bright end. The survey will be enhanced by several complementary surveys and near-IR, mid-IR, far-IR, submm, and radio wavelengths. Deep GLIMPSE will allow us to map stellar Galactic structure out to the edge of the stellar disk; map star formation and H II regions in the far outer Galaxy; improve our estimate of the star formation rate (SFR) of the Galaxy and study the SFR as a function of Galactocentric distance; study low-mass as well as high-mass star formation in the Galactic plane and determine stellar mass functions and evolutionary timescales of YSOs as a function of stellar mass and environment; continue to catalog PAH bubbles, IRDCs, YSO outflows, stellar clusters, external galaxies, brown dwarfs, and more; and search for dwarf galaxies hidden by the Galactic midplane.

Deep GLIMPSE proposal

Observations/Data Processing

Observations started March 11, 2012. Here is the summary of the priority 2 AORs
and areal coverage.
o=observed; s=scheduled

Seg Date     Long Range AORs Hrs   Processing Status
--- -------- ----------- -- -----  --------------------------------------
o 1 20120528 264.7 270.3 25  27.9  *source lists,images made
o 2 20130218 269.8 274.1 19  20.8  source extraction almost done
o 3 20130304 273.9 281.1 31  35.6
o 4 20120310 280.8 288.1 31  35.0  *source lists,images made
o 5 20120320 287.8 295.0 30  34.9  source lists,images made
o 6 20120330 294.8 302.1 29  34.7  source lists,images made
o 7 20120408 301.9 309.1 28  34.7  source lists,images made
o 8 20120420 308.8 316.0 25  34.6  source lists,images made
                                   avoided Alf Cen 315.73, -0.68
o 9 20120428 315.7 323.2 31  36.9  source lists,images made
o10 20120510 322.7 330.2 32  37.2  source lists,images made

o11 20120605  29.4  34.8 25  35.8  source lists,images made
o12 20121115  34.3  39.7 24  34.5  source lists,images made
o13 20121122  39.3  44.7 24  34.5  source lists,images made
o14 20121129  44.3  49.7 24  34.7  source lists,images made
o15 20121206  49.3  54.7 24  34.6  source lists,images made 
o16 20121213  54.3  59.7 24  34.6  source lists,images made
o17 20121220  59.3  65.1 25  37.2  source lists,images made
                 Total: 451 578.2

*There were some IRAC frames that were not pointing refined and thus have poorer
positions. The l=264-266, 266-268 and 286-288 deg source lists
have been re-made, without these frames.

Priority 3 time

Seg Date     Long Range   Lat range  AORs Hrs   Processing Status
--- -------- ----------- ------------ -- -----  --------------------------------------
o 1 20121015 329.8 335.2 -2.05  +0.10 22  39.6  source lists;images made
o 2 20121022 334.8 340.2 -2.00  +0.10 23  39.5  source lists;images made
o 3 20121029 339.8 345.2 -2.00  +0.10 24  39.8  source lists;images made
o 4 20121105 344.8 350.2 -2.00  +0.10 24  39.5  source lists;images made
o 5 20121112 024.8 030.0  0.50  +2.70 24  39.9  source lists,images made
                         Total:      116 198.3

Deep GLIMPSE visibilities

The Color code is as follows:
Green - Visibility of Priority 2 segments
Red - Visibility of Priority 3 segments
Yellow - Initial planned observations of Priority 2 obs
Orange - Actually Observed Data
Dark Blue - Replanned Priority 2 segments
Lt Blue - Newly planned Priority 3 segments

GLIMPSE surveys areal coverages

GLIMPSE360 Areal Coverage
[GLIMPSE360 areal coverage]

MSX 8 micron image of the Outer Galactic plane from Price et al. 2001. The GL360 survey limits are shown with solid red lines and are based on the midplane of the CO/HI warp at a Galactocentric radius of 13 kpc (Binney & Merrifield 1998); the dashed line shows the position of the warp at 14 kpc. The filled circles show the mean latitude of red IRAS sources, binned by 10 deg in longitude. Rectangular boxes show regions previously observed with IRAC. In the small programs, the exact orientation of the observing strip is not shown, and is placed vertically on the figure.

GLIMPSE,GLIMPSEII,GLIMPSE3D areal coverage

[GLIMPSE,GLIMPSEII,GLIMPSE3D areal coverage]
COBE/DIRBE 4.9 um map of infrared intensity in the Galactic plane. The dotted lines show the area already observed by GLIMPSEI and GLIMPSEII. The vertical extensions for GLIMPSE3D are shown with solid lines.

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April 04, 2013

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