{"id":5399,"date":"2016-08-12T15:12:42","date_gmt":"2016-08-13T01:12:42","guid":{"rendered":"http:\/\/www.eaobservatory.org\/jcmt\/?page_id=5399"},"modified":"2023-07-31T11:38:25","modified_gmt":"2023-07-31T21:38:25","slug":"harp-rasters","status":"publish","type":"page","link":"https:\/\/www.eaobservatory.org\/jcmt\/instrumentation\/heterodyne\/observing-modes\/harp-rasters\/","title":{"rendered":"HARP rasters"},"content":{"rendered":"

Note: When HARP has only 12\/16 receptors available smooth maps are archived best using 1\/8 array spacing or half beam spacing. Unless smoothing do not go below 1\/4 array spacing.\u00a0<\/span><\/p>\n

Below is a comparison of HARP raster observations made with all different Scan Spacings which are available in the OT.<\/p>\n

All observations made towards NGC7538IRS1 180×180 arcsec (basket weaving) on 20160608 (scans 70 – 94), CO(3-2) bandwidth 1000 MHz.
\nObserving times are from FITS header (DATE-END – DATE-OBS).
\nFor comparison are given times from the OT and the ITC
\nThe intensity scale is the same in all plots (rms 0.5 – 2.0 K; time 0.5 – 17 sec).<\/p>\n

The figures show the following:
\nLeft: Integrated intensity
\nMiddle: RMS
\nRight: Effective integration time (EFF_TIME)<\/p>\n

Color codes for the integration times:
\nRed-orange: 13.3 seconds
\nYellow: 10.9 seconds
\nGreen: 9.0 seconds
\nLight blue: 6.2 seconds
\nDark blue: 3.0 seconds
\nBlack: 1.0 seconds<\/p>\n

The black square indicates the approximate size and location of the requested 180″x180″ field<\/p>\n

Average rms within 180″x180″ field:
\n1 array overlap: 0.80 K (minimum 0.54 K; maximum 1.31 K)
\n3\/4 array overlap: 0.76 K (minimum 0.48 K; maximum 1.48 K)
\n1\/2 array overlap: 0.73 K (minimum 0.55 K; maximum 1.19 K)
\n1\/4 array overlap: 0.80 K (minimum 0.60 K; maximum 1.46 K)
\n1\/8 array overlap: 0.75 K (minimum 0.58 K; maximum 1.10 K)
\n1 sample overlap: 0.78 K (minimum 0.56 K; maximum 1.17 K)<\/p>\n

Scan 70, 71; 1 array overlap; 2 sec; 4:24 + 4:23 = 8:47; OT 10:30; ITC 5:19
\n\"ngc7538_raster_1\"<\/a>\"ngc7538_raster_1_rms\"<\/a>\"ngc7538_raster_1_time\"<\/a><\/p>\n

Scan 73, 76; 3\/4 array overlap; 1.5 sec; 4:53 + 4:57 = 9:50; OT 11:55; ITC 6:03
\n\"ngc7538_raster_2\"<\/a>\"ngc7538_raster_2_rms\"<\/a>\"ngc7538_raster_2_time\"<\/a><\/p>\n

Scan 77, 79; 1\/2 array overlap; 1 sec; 4:47 + 4:51 = 9:38; OT 11:42; ITC 5:55
\n\"ngc7538_raster_3\"<\/a>\"ngc7538_raster_3_rms\"<\/a>\"ngc7538_raster_3_time\"<\/a><\/p>\n

Scan 91, 92; 1\/4 array overlap; 0.5 sec; 5:15 + 5:19 = 10:34; OT 12:40; ITC 6:24
\n\"ngc7538_raster_4\"<\/a>\"ngc7538_raster_4_rms\"<\/a>\"ngc7538_raster_4_time\"<\/a><\/p>\n

Scan 81, 87; 1\/8 array overlap; 0.25 sec; 5:45 + 5:56 = 11:41; OT 15:51; ITC 7:59
\n\"ngc7538_raster_5\"<\/a>\"ngc7538_raster_5_rms\"<\/a>\"ngc7538_raster_5_time\"<\/a><\/p>\n

Scan 94, 96; 1 sample overlap; 0.125 sec; 7:50 + 7:57 = 15:47; OT 22:50; ITC 11:29
\n\"ngc7538_raster_6\"<\/a>\"ngc7538_raster_6_rms\"<\/a>\"ngc7538_raster_6_time\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Note: When HARP has only 12\/16 receptors available smooth maps are archived best using 1\/8 array spacing or half beam spacing. Unless smoothing do not go below 1\/4 array spacing.\u00a0 Below is a comparison of HARP raster observations made with all different Scan Spacings which are available in the OT.\u2026 Continue reading<\/a><\/p>\n","protected":false},"author":10,"featured_media":0,"parent":166,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/5399"}],"collection":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/comments?post=5399"}],"version-history":[{"count":23,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/5399\/revisions"}],"predecessor-version":[{"id":12919,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/5399\/revisions\/12919"}],"up":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/166"}],"wp:attachment":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/media?parent=5399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}