antennae aors steve lord lord@ipac caltech edu june 25 26 2009 hexgal planning n.
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Antennae AORs (Steve Lord lord@ipac.caltech.edu June 25, 26 2009 HEXGAL Planning. The Antennae Observations

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The Antennae Observations

The PACS team has in principal agreed on complimentary observation with us. E. Sturm is doing 6.5 hours with PACS on two pointings covering the overlap region and NGC 4039 hot spots. They will do [CII] [NII] 122 um, [NIII] 57 um, and [OI] 63 um. We will complement this study doing the same four lines with PACS on NGC 4038.

We will also cover (in our 20h program) the same 3 regions, producing HIFI maps of:

[CI] 492 GHz, [CI] 810 GHz, CO (J=9-8) 1037 GHz, and [CII] 1901 GHz

Time was economized in three ways -

Offsetting the need for wider than 1 GHz stability at the all but the lowest frequency by using “fast chop” where we will need multiple subbands for the 200 km/s wide lines expected.

Now always Nyquist sampling but instead just using full (touching) coverage

Mapping only where the 8 um IRAC image peaks.

If any new-found efficiency allows for more observations – we should make the [CII] overlap map Nyquist sampled and wider.

We will have some sampling of 3 regions – the very hot shocked gas near N4039 – (see the following H2 map of Brandl (AstroPh) , the elongated overlap region, and the starburst ring around NGC 4038.

shocks to the south
Shocks to the south

South overlap has a UV hard field

South nuclei has shocked H2

Overlap has 50% of the NIR flux

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Current Antennae Science Team:

Lord, van derWerf, Kramer,Tabatabaei

All are welcome…

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IRS study of Brandl et al 2009 is at the left – The Lower (East) shows the 2 PACS GTKP fields Upper box is our PACS field on N4038 (All fields are observing [NII] 122um [CII] [NIII] [OI] 63um. Circles are our two CII 1901 GHz maps (3.4, 3.9h)