1 / 15

Allen et al. (2005)

Johnstone et al. (2000). Allen et al. (2005). Tracing Dense Core Structure with NH 3. Oph B2. NH 3 (1,1) int. intensity (GBT). 850 m m continuum (JCMT). NH 3 emission shows excellent (but not perfect) correspondence with dust continuum emission. Tracing Dense Core Structure with NH 3.

mingan
Download Presentation

Allen et al. (2005)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Johnstone et al. (2000) Allen et al. (2005)

  2. Tracing Dense Core Structure with NH3 Oph B2 NH3 (1,1) int. intensity (GBT) 850 mm continuum (JCMT) NH3 emission shows excellent (but not perfect) correspondence with dust continuum emission

  3. Tracing Dense Core Structure with NH3 Oph B2 NH3 (1,1) int. intensity (GBT+ATCA) 850 mm continuum (JCMT) NH3 emission shows excellent (but not perfect) correspondence with dust continuum emission

  4. Tracing Dense Core Structure with NH3 NH3 (1,1) in Oph B B3 B2 B1 Friesen et al. (2006, in preparation) Only 20/48 hr observed so far, rest scheduled for October+

  5. Tracing Dense Core Structure with NH3 NH3 in Oph B, C & F Over next semester, will get more GBT and new VLA data: • with (1,1) and (2,2) lines, will derive kinetic temperature across several Oph cores • with opacity, column densities + NH3 abundances • with line widths, probe velocities; with TK, get thermal and non-thermal motions simultaneously, dynamics

  6. Promise of a GBT K-band FPA 5 Rationales for a K-band FPA • increase NH3 observing speed by >1 order of magnitude, map dense cores faster and with better sampling • allow for more serendipitous discovery (early cores?) with wider areal coverage of maps • maximize usage of “precious” K-band conditions at GB • improve core statistics significantly with NH3 follow-up of new Galactic surveys • will provide crucial single-dish data for K-band EVLA projects

  7. Promise of a GBT K-band FPA Gould Belt: 3D schematic Grenier (2004) Gould Belt consists of SF molecular clouds within 500 pc including Orion, Taurus, Ophiuchus, Perseus, Serpens, etc.

  8. Cepheus Flare IC 5146 Orion R CrA Pipe Nebula Taurus Ophiuchus Serpens ~110 sq. deg. atAv ≥ 3 ~1000 sq. deg. atAv ≥ 1 Lupus Nutter (2005), after Cambrésy (1999)

  9. New Local SF Surveys: JCMT Legacy Survey: using SCUBA-2/HARP to map Gould’s Belt clouds to Av = 1-2 in 450/850 mm + lines, polarization in sub-regions (2006+) Herschel GT Key Project: using SPIRE/PACS to map entirety of Gould’s Belt clouds to Av > 3 at 80/110, 170, 250, 360, 520 mm (2008+) Spitzer c2d2 Legacy: using IRAC+MIPS over GB clouds (2003-2007) Promise of a GBT K-band FPA SCUBA-2 HARP Herschel Space Observatory Spitzer Space Telescope

  10. Promise of a GBT K-band FPA Infrared Dark Clouds:Extinction features in the mid-IR MSX 8 mm continuum from Jackson (2005) ~10,000 cold dust clouds seen in silhouette against warmer background dust.

  11. Promise of a GBT K-band FPA l = 326-335 deg, |b| < 1 deg

  12. New Galactic Plane Surveys: JCMT Legacy Survey: (JPS) using SCUBA-2 to map |b| < 1 (2006+) Herschel OT Key Project: (HiGal) using SPIRE/PACS to map |b| < 1 (2008+; not yet approved) Spitzer Legacy: (GLIMPSE1, 2, & 3, MIPSGAL) (2003-2007), using IRAC and MIPS over various ranges of l HI Surveys: (IGPS, etc.), high-resolution 21 cm mapping Promise of a GBT K-band FPA SCUBA-2 Herschel Space Observatory Spitzer Space Telescope

  13. Summary: K-band FPA • synergistic, unique data to other single-dish FPAs • allow large surveys of NH3 emission, yielding kinetic temperatures, column densities, and insight into the dense core dynamics; improve core statistics • maximize use of “precious” K-band conditions in Green Bank • provide crucial single-dish data for K-band EVLA projects in NH3, CCS, HC3N, RRLs, H2O masers, etc. • a 10 x 10 array could yield 5’ x 5’ full-beam coverage

  14. Mr. KLEAN K-band Line Emission Array of Nrao Now with the Power of Ammonia!

More Related