SCUBA-2: an update on the performance of the 10,000 pixel bolometer camera after two years of science operation at the JCMT

Bintley, Dan; Holland, W. S.; MacIntosh, Michael J.; Friberg, Per; Bell, Graham S.; Berke, Daniel A.; Berry, D. S.; Berthold, Ryan; Cookson, Jamie; Coulson, I. M.; Currie, Malcolm J.; Dempsey, Jessica T.; Gibb, A. G.; Gorges, Bryan H.; Graves, Sarah; Jenness, Tim; Johnstone, Doug; Parsons, Harriet; Thomas, H. S.; Walther, Craig; Wouterloot, J. G. A.

doi:10.1117/12.2055231

Cited by 21 publications

(11 citation statements)

References 10 publications

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“…Each individual survey field is sampled using a regular grid (see Fig. 3 of Moore et al 2015) of eleven circular tiles with diameter of one degree, observed using the pong3600 mode of SCUBA-2 (Bintley et al 2014). Each individual pong3600 takes 40-45 minutes to observe and reaches a pixel-to-pixel rms of ∼ 92 mJy beam −1 in the assigned weather band, when reduced with 3-arcsec pixels.…”

Section: Observing Strategymentioning

confidence: 99%

The JCMT Plane Survey: first complete data release – emission maps and compact source catalogue

Eden

Moore

Plume

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the first data release of the James Clerk Maxwell Telescope (JCMT) Plane Survey (JPS), the JPS Public Release 1 (JPSPR1). JPS is an 850-µm continuum survey of six fields in the northern inner Galactic Plane in a longitude range of = 7 • -63 • , made with the Sub-millimetre Common-User Bolometer Array 2 (SCUBA-2). This first data release consists of emission maps of the six JPS regions with an average pixel-to-pixel noise of 7.19 mJy beam −1 , when smoothed over the beam, and a compact-source catalogue containing 7,813 sources. The 95 per cent completeness limits of the catalogue are estimated at 0.04 Jy beam −1 and 0.3 Jy for the peak and integrated flux densities, respectively. The emission contained in the compact-source catalogue is 42 ± 5 per cent of the total and, apart from the large-scale (greater than 8 arcmin) emission, there is excellent correspondence with features in the 500-µm Herschel maps. We find that, with two-dimensional matching, 98 ± 2 per cent of sources within the fields centred at = 20 • , 30 • , 40 • and 50 • are associated with molecular clouds, with 91 ± 3 per cent of the = 30 • and 40 • sources associated with dense molecular clumps. Matching the JPS catalogue to Herschel 70-µm sources, we find that 38 ± 1 per cent of sources show evidence of ongoing star formation. The images and catalogue will be a valuable resource for studies of star formation in the Galaxy and the role of environment and spiral arms in the star formation process.

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Section: Observing Strategymentioning

confidence: 99%

The JCMT Plane Survey: first complete data release – emission maps and compact source catalogue

Eden

Moore

Plume

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…Perseus was observed by SCUBA-2 at 450 µm and 850 µm in ten ∼ 30 ′ fields. Each field was observed multiple times with a PONG1800 observing pattern, where the instrument makes five square scans that are successively rotated by 18 • on the sky (see Kackley et al 2010;Holland et al 2013;Bintley et al 2014). Each field was reduced separately and then mosaicked together using the SMURF package in Starlink (Jenness et al 2011;Chapin et al 2013;Currie et al 2014) using user-defined masks to identify regions of bright emission in a second iteration of the reduction (e.g., see Mairs et al 2015).…”

Section: Scuba-2 Observationsmentioning

confidence: 99%

Embedded binaries and their dense cores

Sadavoy

Stahler

2017

Monthly Notices of the Royal Astronomical Society

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We explore the relationship between young, embedded binaries and their parent cores, using observations within the Perseus Molecular Cloud. We combine recently published VLA observations of young stars with core properties obtained from SCUBA-2 observations at 850 µm. Most embedded binary systems are found toward the centres of their parent cores, although several systems have components closer to the core edge. Wide binaries, defined as those systems with physical separations greater than 500 au, show a tendency to be aligned with the long axes of their parent cores, whereas tight binaries show no preferred orientation. We test a number of simple, evolutionary models to account for the observed populations of Class 0 and I sources, both single and binary. In the model that best explains the observations, all stars form initially as wide binaries. These binaries either break up into separate stars or else shrink into tighter orbits. Under the assumption that both stars remain embedded following binary breakup, we find a total star formation rate of 168 Myr −1 . Alternatively, one star may be ejected from the dense core due to binary breakup. This latter assumption results in a star formation rate of 247 Myr −1 . Both production rates are in satisfactory agreement with current estimates from other studies of Perseus. Future observations should be able to distinguish between these two possibilities. If our model continues to provide a good fit to other star-forming regions, then the mass fraction of dense cores that becomes stars is double what is currently believed.

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“…Using a higher TES bias and lower heater setting will in general put more of the sub-array into transition but reduces the detector responsivity. We have found, however, that a lower TES bias gives improved detector noise performance 9 . The optimum array setup for scan mode observing is therefore a compromise between the noise performance of individual detectors and the number of working detectors on each sub-array, in order to give the overall fastest mapping speed of the instrument.…”

Section: Flux Jumpingmentioning

confidence: 98%

SCUBA-2 Fourier transform spectrometer (FTS-2) commissioning results

et al. 2014

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We present the latest commissioning results and instrument performance for the SCUBA-2 imaging Fourier Transform Spectrometer (FTS-2) installed at the James Clerk Maxwell Telescope (JCMT). This ancillary instrument provides intermediate spectral resolution (R ~10 to 5000) across both the 450 and 850 µm atmospheric transmission windows with a FOV of ~5 arcmin 2 . The superconducting TES sensors and SQUID readout of SCUBA-2 present unique challenges for operation of an FTS; the sensitivity requirements demand high detector linearity and stability in addition to control of systematic atmospheric and optical spillover effects. We discuss the challenges encountered during commissioning and ongoing efforts to mitigate their effects.

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SCUBA-2: an update on the performance of the 10,000 pixel bolometer camera after two years of science operation at the JCMT

Cited by 21 publications

References 10 publications

The JCMT Plane Survey: first complete data release – emission maps and compact source catalogue

The JCMT Plane Survey: first complete data release – emission maps and compact source catalogue

Embedded binaries and their dense cores

SCUBA-2 Fourier transform spectrometer (FTS-2) commissioning results

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