Kevin Lacaille
A5014410598- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Molecular Spectroscopy and Structure
- Radio Astronomy Observations and Technology
- Atomic and Molecular Physics
- Advanced Combustion Engine Technologies
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Atmospheric and Environmental Gas Dynamics
- Quantum Chromodynamics and Particle Interactions
- Scientific Research and Discoveries
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Superconducting Materials and Applications
- Laser Design and Applications
- High-pressure geophysics and materials
Dalhousie University
2017-2024
McMaster University
2017-2024
We present the first results from B-fields In STar-forming Region Observations (BISTRO) survey, using Sub-millimetre Common-User Bolometer Array 2 (SCUBA-2) camera, with its associated polarimeter (POL-2), on James Clerk Maxwell Telescope (JCMT) in Hawaii. discuss survey's aims and objectives. describe rationale behind questions which survey will aim to answer. The most important of these is role magnetic fields star formation process scale individual filaments cores dense regions. data...
We present sensitive 850$\mu$m imaging of the COSMOS field using 640hr new and archival observations taken with SCUBA-2 at East Asian Observatory's James Clerk Maxwell Telescope. The survey (S2COSMOS) achieves a median noise level $\sigma_{850\mu{\mathrm{m}}}$=1.2mJy/beam over an area 1.6 sq. degree (MAIN; HST/ACS footprint), $\sigma_{850\mu{\mathrm{m}}}$=1.7mJy/beam additional 1 supplementary (SUPP) coverage. catalogue 1020 127 sources detected significance >4$\sigma$ >4.3$\sigma$ in MAIN...
Context. Molecular filaments and hubs have received special attention recently thanks to new studies showing their key role in star formation. While the (column) density velocity structures of both been carefully studied, magnetic field (B-field) properties yet be characterized. Consequently, B-fields formation evolution hub-filament systems is not well constrained. Aims. We aim understand B-field its interplay with turbulence gravity dynamical NGC 6334 filament network that harbours...
Abstract Most protostars have luminosities that are fainter than expected from steady accretion over the protostellar lifetime. The solution to this problem may lie in episodic mass accretion—prolonged periods of very low punctuated by short bursts rapid accretion. However, timescale and amplitude for variability at phase is almost entirely unconstrained. In A James Clerk Maxwell Telescope/SCUBA-2 Transient Survey Protostars Nearby Star-forming Regions, we monitoring monthly with SCUBA-2...
We present the results of dust emission polarization measurements Ophiuchus-B (Oph-B) carried out using Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter (POL-2) on James Clerk Maxwell Telescope (JCMT) in Hawaii. This work is part B-fields In Star-forming Region Observations (BISTRO) survey initiated to understand role magnetic fields star formation for nearby star-forming molecular clouds. a first look at geometry and strength Oph-B. The field...
The low dust temperatures (<14 K) of Planck Galactic cold clumps (PGCCs) make them ideal targets to probe the initial conditions and very early phase star formation. "TOP-SCOPE" is a joint survey program targeting ∼2000 PGCCs in J = 1–0 transitions CO isotopologues ∼1000 850 μm continuum emission. objective surveys (SMT 10 m, KVN 21 NRO 45 m) statistically study occurring during formation evolution molecular clouds, across wide range environments. observations, data analysis, example science...
Abstract We present 850 μ m imaging polarimetry data of the ρ Oph-A core taken with Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part our ongoing survey project, <?CDATA ${\boldsymbol{B}}$?> -fields In STar forming RegiOns (BISTRO). The polarization vectors are used to identify orientation magnetic field projected on plane sky at a resolution 0.01 pc. 10 subregions distinct fractions angles in 0.2 pc core; some them can be coherent structure Oph...
We present new observations of the active star-formation region NGC 1333 in Perseus molecular cloud complex from James Clerk Maxwell Telescope B-Fields In Star-forming Region Observations (BISTRO) survey with POL-2 instrument. The BISTRO data cover entire (~1.5 pc x 2 pc) at 0.02 resolution and spatially resolve polarized emission individual filamentary structures for first time. inferred magnetic field structure is as a whole, each filament aligned different position angles relative to...
Abstract We present the B -fields mapped in IRDC G34.43+0.24 using 850 μ m polarized dust emission observed with POL-2 instrument at James Clerk Maxwell telescope. examine magnetic field geometries and strengths northern, central, southern regions of filament. The overall geometry is ordered aligned closely perpendicular to filament’s main axis, particularly containing central clumps MM1 MM2, whereas MM3 north has orientations its major axis. are uniform large (POL-2 14″ SHARP 10″) small...
We report 850~$\mu$m dust polarization observations of a low-mass ($\sim$12 $M_{\odot}$) starless core in the $\rho$ Ophiuchus cloud, C, made with POL-2 instrument on James Clerk Maxwell Telescope (JCMT) as part JCMT B-fields In STar-forming Region Observations (BISTRO) survey. detect an ordered magnetic field projected plane sky core. The across $\sim$0.1~pc shows predominant northeast-southwest orientation centering between $\sim$40$^\circ$ to $\sim$100$^\circ$, indicating that is well...
Abstract We present 850 μ m polarimetric observations toward the Serpens Main molecular cloud obtained using POL-2 polarimeter on James Clerk Maxwell Telescope as part of B-fields In STar-forming Region Observations survey. These probe magnetic field morphology about 6000 au scales, which consists cores and six filaments with different physical properties such density star formation activity. Using histogram relative orientation (HRO) technique, we find that fields are parallel to in...
We present James Clerk Maxwell Telescope Submillimetre Common-User Bolometer Array 2 (SCUBA-2) 850 & 450 $\mu$m observations ($\sigma_{850}\sim0.5$ mJy, $\sigma_{450}\sim5$ mJy) of the HS1549+19 and HS1700+64 survey fields containing two largest known galaxy over-densities at $z=2.85$ $2.30$, respectively. detect 56 sub-millimetre galaxies (SMGs) with SNR $> 4$ over $\sim 50$ arcmin$^2$ flux densities 3 - 17 mJy. The number counts indicate in $3$-arcmin diameter core region ($\sim 1.5$ Mpc...
Abstract We report 850 μ m continuum polarization observations toward the filamentary high-mass star-forming region NGC 2264, taken as part of B -fields In STar forming Regions Observations large program on James Clerk Maxwell Telescope. These data reveal a well-structured nonuniform magnetic field in 2264C and 2264D regions with prevailing orientation around 30° from north to east. Field strength estimates virial analysis major clumps indicate that is globally dominated by gravity, while...
JINGLE is a new JCMT legacy survey designed to systematically study the cold interstellar medium of galaxies in local Universe. As part we perform 850 µm continuum measurements with SCUBA-2 for representative sample 193 Herschel-selected M* > 109 M⊙, as well integrated CO(2–1) line fluxes RxA3m subset 90 these galaxies. The selected from fields covered by Herschel-ATLAS that are also targeted MaNGA optical integral-field spectroscopic survey. observations combined multiwavelength ancillary...
We have used the Submillimeter Array at 860$\,\mu$m to observe brightest SCUBA-2 sources in 4$\,$deg$^{2}$ of Cosmology Legacy Survey. targeted 75 single-dish 850$\,\mu$m down $S_{850}\,{\approx}\,8\,$mJy, achieving an average synthesized beam 2.4$^{\prime\prime}$ and rms $\sigma_{860}\,{=}\,1.5\,$mJy our primary beam-corrected maps. searched maps for $4\sigma$ peaks, corresponding $S_{860}\,{\gtrsim}\,6\,$mJy sources, detected 59 single galaxies three pairs galaxies. include study 28...
We identify multi-wavelength counterparts to 1147 submillimeter sources from the S2COSMOS SCUBA-2 survey of COSMOS field by employing a recently developed radio+machine-learning method trained on large sample Atacama Large Millimeter/submillimeter Array (ALMA)–identified galaxies (SMGs), including 260 SMGs identified in AS2COSMOS pilot survey. In total, we 1222 optical/near-infrared (NIR)/radio 897 with S850 > 1.6 mJy, yielding an overall identification rate (78 ± 9)%. find that (22 5)% have...
Abstract We report the first high spatial resolution measurement of magnetic fields surrounding LkH α 101, part Auriga–California molecular cloud. The observations were taken with POL-2 polarimeter on James Clerk Maxwell Telescope within framework B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization thermal dust emission at 850 μ m is found to be mostly associated redshifted gas component field displays a relatively complex morphology. Two variants...
We study the HII regions associated with NGC 6334 molecular cloud observed in sub-millimeter and taken as part of B-fields In STar-forming Region Observations (BISTRO) Survey. particular, we investigate polarization patterns magnetic field morphologies these regions. Through pattern pressure calculation analyses, several bubbles indicate that gas lines have been pushed away from bubble, toward an almost tangential (to bubble) morphology. densest 6334, where morphology is similar to...
Abstract We present the 850 μ m polarization observations toward IC 5146 filamentary cloud taken using Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated polarimeter (POL-2), mounted on James Clerk Maxwell Telescope, as part of B -fields In STar forming Regions Observations. This work is aimed at revealing magnetic field morphology within a core-scale (≲1.0 pc) hub-filament structure (HFS) located end parsec-scale filament. To investigate whether observed traces in HFS,...
We present the results of simultaneous 450 $\mu$m and 850 polarization observations toward massive star forming region NGC 2071IR, a target BISTRO (B-fields in Star-Forming Region Observations) Survey, using POL-2 polarimeter SCUBA-2 camera mounted on James Clerk Maxwell Telescope. find pinched magnetic field morphology central dense core region, which could be due to rotating toroidal disk-like structure bipolar outflow originating from young stellar object, IRS 3. Using modified...
We present 850 $\mu$m dust polarization observations of the massive DR21 filament from B-fields In STar-forming Region Observations (BISTRO) survey, using POL-2 polarimeter and SCUBA-2 camera on James Clerk Maxwell Telescope. detect ordered magnetic fields perpendicular to parsec-scale ridge main filament. sub-filaments, are mainly parallel filamentary structures smoothly connect compare Planck study field 0.1--10 pc scales. The revealed in data well aligned with those data, indicating a...
We present and analyze observations of polarized dust emission at 850 $\mu$m towards the central 1 pc $\times$ hub-filament structure Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on James Clerk Maxwell Telescope (JCMT) as part BISTRO (B-fields in Star-forming Region Observations) survey. orientations magnetic field follow spiral Mon R2, which well-described by an axisymmetric model. estimate turbulent component using angle difference between our best-fit model underlying...
Abstract We present observations of polarized dust emission at 850 μ m from the L43 molecular cloud, which sits in Ophiuchus cloud complex. The data were taken using SCUBA-2/POL-2 on James Clerk Maxwell Telescope as a part BISTRO large program. is dense ( <?CDATA ${N}_{{{\rm{H}}}_{2}}\sim {10}^{22}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>N</mml:mi> </mml:mrow> <mml:mi mathvariant="normal">H</mml:mi> <mml:mn>2</mml:mn>...