... This algorithm is designed to pick up sources that have either extents much greater than that of the points-spread function or any other sources that were not picked up by the point-source detection algorithm. ... nESources - the total number of extended-sources detected so far . ... eLevelImage - a two-dimension array that stores the pixels assigned to the extended-sources- each pixel assigned to the source is set equal to the number assigned to the source. ... x - stores the pixel index i . ...

Next: Astrometry Up: Star DetectionAstrometry, and Previous: Restoration Methods Evaluated . The first criterion used to evaluate the restoration techniques is the ability to detect stars in the restored image without ``detecting'' noise and restoration artifacts. We used a simple detection algorithm which finds the local maximum in the restored image above a user-supplied threshold. ... Numerous artifacts around bright stars make star detection very difficult in the linear restorations. ...

HI source finding algorithms Comparing the general purpose Duchamp algorithm to a purpose built HI source finding algorithm Talk Outline · Common elements of source finding algorithms · The Duchamp algorithm · · · · Algorithm Strengths Draw-backs Improvements · An alternative HI source finder algorithm · Key differences · Algorithm · Preliminary work · Conclusion Common elements of general ...

... CELLMAP -- prepares x-ray qp file for DETECT. ... Running Snrmap .. ... Input xray Qpoe : xdata $rp110590.qp Output xray image : rp110590_cmp ROSAT PSPC Cellsize in arcsecs - 30 [h/b]| 45 [s]| 60 [s/h/b]| 120 [s/h/b]: 30 Energy Band (soft|hard|broad) (broad): hard xdata $rp110590.qp[bl=20,pi=52:201][128:639,128:639] - rp110590_cmp.imh add rp110590_cmp.imh,cellsize = 30 rp110590_cmp.imh updated xdata $rp110590.qp[pi=52:201] de snrmap Input xray image : rp110590_cmp Output snrmap ...

... Download the code document. A new version will be released soon with a more detailed document. An X-ray source detection algorithm, optimally designed to detected faint extended sources, making use of Voronoi tessellation and Friend-of-Friend technique. ... This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License. Download sweepline.py . ... ROSAT 400d . ROSAT MACS . ROSAT WARPS . ROSAT REFLEX . ... XMM XCS . ...

The deferred photometric pipeline of SNLS uses only photometry to detect and classify type Ia supernovae (SNe Ia). The advantages of a photometric sample include larger number of events classified as type Ia, larger redshift coverage and no need for spectroscopic observations. ... First, a subtracted image stack treatment was developed to reduce the number of non SN-like events using morphological component analysis. ... Second, a new classification using photometric SN redshifts is introduced. ...

... The measured gravitational waves match those expected from two large black holes merging after a death spiral in a distant galaxy, with the resulting new black hole momentarily vibrating in a rapid ringdown . ... The featured illustration depicts the two merging black holes with the signal strength of the two detectors over 0.3 seconds superimposed across the bottom. ... Two Black Holes Merge . Advanced LIGO: Gravitational Wave Detectors Upgraded . ... A Step Toward Gravitational Wave Detection ...

... During the analysis of the surveys carried out on RATAN-600, it was found that almost one fifth of the detected sources shows significant radio flux variations. ... We used the data from "Cold" radio surveys carried out with RATAN-600 in 1980-1994 to search for radio sources with significant flux variability. ... On possibility of detection of variable sources using the data of Cold surveys carried out on RATAN-600. ... Detection of Variable Sources Using the Data of "Cold" Surveys. ...

... 2016 February 11 . LIGO Detects Gravitational Waves from Merging Black Holes . ... The first-ever detection was made by both facilities of the Laser Interferometer Gravitational-Wave Observatory (LIGO) in Washington and Louisiana simultaneously last September. ... The measured gravitational waves match those expected from two large black holes merging after a death spiral in a distant galaxy, with the resulting new black hole momentarily vibrating in a rapid ringdown . ... About APOD | ...

... The standard science quicklook processing produces over a dozen sky maps at each downlink, and these maps are automatically searched for potential transient point sources. ... We have found that a heuristic modification of a formula derived by Li & Ma (1983) provides reasonably accurate estimates of p -values for point source detections even for very low p -value detections. ... Case 1u. The most straightforward approach uses the signal , where . ... To get a p -value, use . ...

Next: Regularization of the Up: Regularization from significant Previous: Regularization from significant . Van Cittert's iteration is: . ... The regularization by the significant structures leads to: . The basic idea of our method consists of detecting, at each scale, structures of a given size in the residual and putting them in the restored image . ... is the restored image, which does not contain any noise, and is the final residual which does not contain any structure. ...