SAM = SOAR Adaptive Module


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  • Improved angular resolution at optical and infrared wavelengths 
  • Uniform and selective compensation of low-altitude turbulence
  • A relatively wide field (3 arcminutes)
  • FWHM resolution improved to 0.3"-0.5" under good conditions
  • Integrated CCD Imager
  • Correction achieved using a low-altitude Rayleigh laser guide star and two (or one) tip-tilt guide stars (R<18)


March 25, 2014. The report on SAM science verification is posted. Get the report here.
In March 2014, SAM executed two observing proposals. The image below taken on March 4, 2014, shows gravitational arc MACS1206.2-0847 (combined from two 12-min. exposures in the i' and r' filters, FWHM resolution of 0.36 and 0.39 arcsec, respectively).
Arc

February 2014. The SAM science verification program is finished in the January 2014 run. The picture below shows gravitational arcs in the galaxy cluster Abel 370 as seen by by the SDSS, HST, and SAM (from SV proposal by G.~Caminha et al.)
Abel 370

The FULL IMAGE shows an amazing picture where almost every source is a distant galaxy, partially resolved by SAM, and only few are stars. The dark shadow on the left is produced by the SAM guide probe wich used a guide star at the periphery of the science field (this is a region of low star density). Several gravitational arcs are seen in the image. Elongation of galaxies caused by the weak lensing is also noticeable. The images were taken on September 29, 2013 under non-optimal conditions and has a FWHM resolution of 0.5 arcsec. Five 5-min. exposures in the SDSS i' and r' filters were combined to produce the picture.


December 3, 2013. The report on SAM commissioning is posted. Get the report here.

February 2013. Composite image of the planetary nebula NGC~2440 taken with SAM on February 26, 2013. The (r,g,b) colors correspond to the B,V,Halpha, the FWHM resolution is 0.35 arcsec in all bands.
NGC 2440

January 24, 2013. The paper based on SAM LGS data has been submitted to the Astronomical Journal.
Title: SOAR adaptive optics observations of the globular cluster NGC 6496
Authors: Luciano Fraga, Andrea Kunder, Andrei Tokovinin.
See the published paper at Astro-ph: :1304.4880 [Full reference: 2013, AJ, 145, 165]

January 18, 2013. Science verification of SAM starts this semester, 2013A. The deadline for the proposals is March 15, 2013. See the Call for Proposals

May 15, 2012. On the engineering night of May 8/9 SAM reached a resolutin of 0.26" in the I band, showing substantial gain over open-loop data. The image fragment (click to enlarge) shows globular cluster NGC 6496.
NGC 6496, I-band

Filter I: exposure 120c, resolution 0.26" (closed-loop) and 0.51" (open loop).





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