Software design for panoramic astronomical pipeline processing

Shamir, Lior; Nemiroff, Robert J.; Torrey, David O.; Pereira, W. E.

doi:10.1111/j.1365-2966.2005.09903.x

Cited by 3 publications

(5 citation statements)

References 27 publications

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“…If only one object is found, the object is scanned for peaks using a point spread function detection algorithm (Shamir & Nemiroff 2005a,b), and if more than one peak is found the image is considered a potential galaxy merger. The peak detection code is part of the Wolf open source image analysis package (Shamir et al 2006;Shamir 2012a). It should be noted that the same technique can also be used for automatic detection of recoiling supermassive black holes.…”

Section: Methodsmentioning

confidence: 99%

Automatic detection and quantitative assessment of peculiar galaxy pairs in Sloan Digital Sky Survey

Shamir¹,

Wallin²

2014

Monthly Notices of the Royal Astronomical Society

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We applied computational tools for automatic detection of peculiar galaxy pairs. We first detected in SDSS DR7 ∼400,000 galaxy images with i magnitude <18 that had more than one point spread function, and then applied a machine learning algorithm that detected ∼26,000 galaxy images that had morphology similar to the morphology of galaxy mergers. That dataset was mined using a novelty detection algorithm, producing a short list of 500 most peculiar galaxies as quantitatively determined by the algorithm. Manual examination of these galaxies showed that while most of the galaxy pairs in the list were not necessarily peculiar, numerous unusual galaxy pairs were detected. In this paper we describe the protocol and computational tools used for the detection of peculiar mergers, and provide examples of peculiar galaxy pairs that were detected.

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Section: Methodsmentioning

confidence: 99%

Automatic detection and quantitative assessment of peculiar galaxy pairs in Sloan Digital Sky Survey

Shamir¹,

Wallin²

2014

Monthly Notices of the Royal Astronomical Society

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“…Once a flash is recorded it is compared to previous images to check if the flash is persistent and rotates with the sky. If a flash appears to be rotating with the sky for at least two images, the system alerts on that flash as an optical transient candidate (Shamir et al 2006).…”

Section: Softwarementioning

confidence: 99%

Frequency Limits on Naked-Eye Optical Transients Lasting From Minutes to Years

Shamir¹,

Nemiroff

2009

The Astronomical Journal

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How often do bright optical transients occur on the sky but go unreported? To constrain the bright end of the astronomical transient function, a systematic search for transients that become bright enough to be noticed by the unaided eye was conducted using the all-sky monitors of the Night Sky Live network. Two fisheye continuous cameras (CONCAMs) operating over three years created a data base that was searched for transients that appeared in time-contiguous CCD frames. Although a single candidate transient was found , the lack of more transients is used here to deduce upper limits to the general frequency of bright transients. To be detected, a transient must have increased by over three visual magnitudes to become brighter than visual magnitude 5.5 on the time scale of minutes to years. It is concluded that, on the average, fewer than 0.0040 (t dur /60 seconds) transients with duration t dur between minutes and hours, occur anywhere on the sky at any one time. For transients on the order of months to years, fewer than 160 (t dur /1 year) occur, while for transients on the order of years to millennia, fewer than 50 (t dur /1 year) 2 occur.

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“…If a flash appears to be rotating with the sky for several consecutive images, and/or recorded simultaneously by two distant cameras, the flash is alerted as an optical transient candidate. A more detailed description of the all-sky transient detection mechanism is available at (Shamir et al 2006).…”

Section: Transient Detection Using All-sky Camerasmentioning

confidence: 99%

“…On the night of 2006 April 20, a flash was recorded by two CONCAM all-sky cameras located in Cerro Pacho ´n, Chile, and La Palma, Spain. The flash was detected by the transient detection software described in Shamir et al (2006). The first image recording the flash was taken in Cerro Pacho ´n at 00:19:43 UT, and the flash was clearly recorded by the next two images taken there at 00:23:39 and 00:27:35 UT.…”

Section: Optical Transient 060420mentioning

confidence: 99%

“…One 180 s exposure is taken every 236 s, and the resulting 1024 # 1024 FITS images are transmitted to the main server, where they are copied to the public domain and can be accessed online. 1 The images are processed by a software program that finds and alerts on de-tection of optical transients (Shamir et al 2006). The limiting stellar magnitude is dependent on the camera, lens, and site and can get up to 6.8 near the image center (Shamir 2005a).…”

Section: Introductionmentioning

confidence: 99%

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OT 060420: A Seemingly Optical Transient Recorded by All‐Sky Cameras

Shamir

Nemiroff

2006

PUBL ASTRON SOC PAC

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We report on a ∼5th magnitude flash detected for approximately 10 minutes by two CONCAM all-sky cameras located in Cerro Pachon -Chile and La Palma -Spain. A third all-sky camera, located in Cerro Paranal -Chile did not detect the flash, and therefore the authors of this paper suggest that the flash was a series of cosmic-ray hits, meteors, or satellite glints. Another proposed hypothesis is that the flash was an astronomical transient with variable luminosity. In this paper we discuss bright optical transient detection using fish-eye all-sky monitors, analyze the apparently false-positive optical transient, and propose possible causes to false optical transient detection in all-sky cameras.

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Software design for panoramic astronomical pipeline processing

Cited by 3 publications

References 27 publications

Automatic detection and quantitative assessment of peculiar galaxy pairs in Sloan Digital Sky Survey

Automatic detection and quantitative assessment of peculiar galaxy pairs in Sloan Digital Sky Survey

Frequency Limits on Naked-Eye Optical Transients Lasting From Minutes to Years

OT 060420: A Seemingly Optical Transient Recorded by All‐Sky Cameras

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