Publications (95)
JCMT BISTRO Observations: Magnetic Field Morphology of Bubbles Associated with NGC 6334
Mehrnoosh Tahani, Pierre Bastien, Ray S. Furuya +142
We study the HII regions associated with the NGC 6334 molecular cloud observed in the sub-millimeter and taken as part of the B-fields In STar-forming Region Observations (BISTRO)…
The JCMT BISTRO survey: alignment between outflows and magnetic fields in dense cores/clumps
Hsi-Wei Yen, Patrick M. Koch, Charles L. H. Hull +43
We compare the directions of molecular outflows of 62 low-mass Class 0 and I protostars in nearby (<450 pc) star-forming regions with the mean orientations of the magnetic fields o…
Relativistic Maxwell-Bloch Equations with Applications to Astrophysics
Ningyan Fang, Victor Botez, Fereshteh Rajabi +1
We derive relativistic Maxwell-Bloch equations for potential applications in astronomical environments, where various radiative processes are known to occur, including the maser ac…
HAWC+/SOFIA Multiwavelength Polarimetric Observations of OMC-1
David T. Chuss, B-G Andersson, John Bally +35
We report new polarimetric and photometric maps of the massive star-forming region OMC-1 using the HAWC+ instrument on the Stratospheric Observatory for Infrared Astronomy (SOFIA).…
Probing the Magnetic Field with Molecular ion Spectra. II
Martin Houde, Ruisheng Peng, Thomas G. Phillips +2
We present further observational evidence in support of our earlier proposal (Houde et al. 2000) for detecting the presence of the magnetic field in molecular clouds by comparing s…
The Twisted Magnetic Field of the Protobinary L483
Erin G. Cox, Giles Novak, Sarah Sadavoy +16
We present H-band (1.65 m) and SOFIA HAWC+ 154 m polarization observations of the low-mass core L483. Our H-band observations reveal a magnetic field that is overwhelmingly…
The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-Forming Region
Simon Coudé, Pierre Bastien, Martin Houde +118
We present the POL-2 850 m linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations (BISTRO)…
B-fields in Star-Forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main
Woojin Kwon, Kate Pattle, Sarah Sadavoy +149
We present 850 m polarimetric observations toward the Serpens Main molecular cloud obtained using the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT) as part of t…
Dispersion of Magnetic Fields in Molecular Clouds. II
Martin Houde, John E. Vaillancourt, Roger H. Hildebrand +2
We expand our study on the dispersion of polarization angles in molecular clouds. We show how the effect of signal integration through the thickness of the cloud as well as across…
Filamentary Network and Magnetic Field Structures Revealed with BISTRO in the High-Mass Star-Forming Region NGC2264 : Global Properties and Local Magnetogravitational Configurations
Jia-Wei Wang, Patrick M. Koch, Seamus D. Clarke +154
We report 850 m continuum polarization observations toward the filamentary high-mass star-forming region NGC 2264, taken as part of the B-fields In STar forming Regions Observa…
Magnetic Field in The Isolated Massive Dense Clump IRAS 20126+4104
Hiroko Shinnaga, Giles Novak, John E. Vaillancourt +8
We measured polarized dust emission at 350um towards the high-mass star forming massive dense clump IRAS 20126+4104 using the SHARC II Polarimeter, SHARP, at the Caltech Submillime…
Matrix decompositions in Quantum Optics: Takagi/Autonne, Bloch-Messiah/Euler, Iwasawa, and Williamson
Martin Houde, Will McCutcheon, Nicolás Quesada
In this note we summarize four important matrix decompositions commonly used in quantum optics, namely the Takagi/Autonne, Bloch-Messiah/Euler, Iwasawa, and Williamson decompositio…
A Tale of Three: Magnetic Fields along the Orion Integral-Shaped Filament as Revealed by JCMT BISTRO survey
Jintai Wu, Keping Qiu, Frederick Poidevin +152
As part of the BISTRO survey, we present JCMT 850 m polarimetric observations towards the Orion Integral-Shaped Filament (ISF) that covers three portions known as OMC-1, OMC-2,…
Triggered superradiance and fast radio bursts
Martin Houde, Fereshteh Rajabi, B. M. Gaensler +2
In this paper we develop a model for fast radio bursts (FRBs) based on triggered superradiance (SR) and apply it to previously published data of FRB 110220 and FRB 121102. We show…
Magnetic Fields in Massive Star-Forming Regions (MagMaR) II. Tomography Through Dust and Molecular Line Polarization in NGC 6334I(N)
Paulo C. Cortes, Patricio Sanhueza, Martin Houde +13
Here, we report ALMA detections of polarized emission from dust, CS(), and CS() toward the high-mass star-forming region NGC6334I(N). A…
Interacting superradiance samples: modified intensities and timescales, and frequency shifts
Martin Houde, Fereshteh Rajabi
We consider the interaction between distinct superradiance (SR) systems and use the dressed state formalism to solve the case of two interacting two-atom SR samples at resonance. W…
A broad survey of spectro-temporal properties from FRB 20121102A
Mohammed A. Chamma, Fereshteh Rajabi, Aishwarya Kumar +1
We survey the spectro-temporal properties of fast radio bursts from FRB 20121102A observed by earlier studies across a wide range of frequencies. We investigate 167 bursts from FRB…
The JCMT BISTRO Survey: Studying the Complex Magnetic Field of L43
Janik Karoly, Derek Ward-Thompson, Kate Pattle +155
We present observations of polarized dust emission at 850 m from the L43 molecular cloud which sits in the Ophiuchus cloud complex. The data were taken using SCUBA-2/POL-2 on t…
The Link between Magnetic Fields and Cloud/Star Formation
Hua-bai Li, Alyssa Goodman, T. K. Sridharan +4
The question whether magnetic fields play an important role in the processes of molecular cloud and star formation has been debated for decades. Recent observations have revealed a…
Non-Zeeman Circular Polarization of Molecular Rotational Spectral Lines
Martin Houde, Talayeh Hezareh, Scott Jones +1
We present measurements of circular polarization from rotational spectral lines of molecular species in Orion KL, most notably 12CO (J=2 - 1), obtained at the Caltech Submillimeter…
Non-Zeeman Circular Polarization of Molecular Spectral Lines in the ISM
Mohammed Chamma, Martin Houde, Josep Miquel Girart +1
Accurately measuring the magnetic field in the ISM is essential for understanding star-formation processes. We searched archival data of the Submillimeter Array (SMA) for evidence…
An Upper Limit on Gas Production from 3200 Phaethon
Paul A. Wiegert, Martin Houde, Ruisheng Peng
Asteroid 3200 Phaethon resembles a comet in some ways, including a highly-eccentric orbit (e=0.89) and a strong associated meteor shower (the Geminids). Yet this object has never b…
Perfect pulsed inline twin-beam squeezers
Martin Houde, Nicolás Quesada
Perfect inline squeezers are both spectrally pure and have identical input and output temporal modes, allowing one to squeeze an arbitrary input quantum state in the sole input mod…
Misalignment of Magnetic Fields and Outflows in Protostellar Cores
Charles L. H. Hull, Richard L. Plambeck, Alberto D. Bolatto +22
We present results of 1.3 mm dust polarization observations toward 16 nearby, low-mass protostars, mapped with ~2.5" resolution at CARMA. The results show that magnetic fields in p…
TADPOL: A 1.3 mm Survey of Dust Polarization in Star-forming Cores and Regions
Charles L. H. Hull, Richard L. Plambeck, Woojin Kwon +22
We present λ1.3 mm CARMA observations of dust polarization toward 30 star-forming cores and 8 star-forming regions from the TADPOL survey. We show maps of all sources, and compare…
Tracing the Magnetic Field in Orion A
Martin Houde, C. Darren Dowell, Roger. H. Hildebrand +5
We use extensive 350 um polarimetry and continuum maps obtained with Hertz and SHARC II along with HCN and HCO+ spectroscopic data to trace the orientation of the magnetic field in…
The JCMT BISTRO Survey: The Magnetic Fields of the IC 348 Star-forming Region
Youngwoo Choi, Woojin Kwon, Kate Pattle +150
We present 850 m polarization observations of the IC 348 star-forming region in the Perseus molecular cloud as part of the B-fields In STar-forming Region Observation (BISTRO)…
Non-Zeeman Circular Polarization of CO rotational lines in SNR IC 443
Talayeh Hezareh, Helmut Wiesemeyer, Martin Houde +2
Context: We investigate non-Zeeman circular polarization and linear polarization levels of up to 1% of CO spectral line emission detected in a shocked molecular clump around…
Characterizing Magnetized Turbulence in M51
Martin Houde, Andrew Fletcher, Rainer Beck +3
We use previously published high-resolution synchrotron polarization data to perform an angular dispersion analysis with the aim of charactering magnetized turbulence in M51. We fi…
The far-infrared polarization spectrum of Rho Ophiuchi A from HAWC+/SOFIA observations
Fabio P. Santos, David T. Chuss, C. Darren Dowell +23
We report on polarimetric maps made with HAWC+/SOFIA toward Rho Oph A, the densest portion of the Rho Ophiuchi molecular complex. We employed HAWC+ bands C (89 m) and D (154 $Î…
Dicke's Superradiance in Astrophysics. II -- The OH 1612 MHz Line
Fereshteh Rajabi, Martin Houde
We apply the concept of superradiance introduced by Dicke in 1954 to the OH molecule 1612 MHz spectral line often used for the detection of masers in circumstellar envelopes of evo…
The Alignment of the Magnetic Field and Collimated Outflows in Star-forming Regions: the Case of NGC 2071
Martin Houde, Thomas G. Phillips, Pierre Bastien +2
The magnetic field is believed to play a crucial role in the process of star formation. From the support it provides during the initial collapse of molecular clouds to the creation…
The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333
Yasuo Doi, Tetsuo Hasegawa, Ray S. Furuya +135
We present new observations of the active star-formation region NGC 1333 in the Perseus molecular cloud complex from the James Clerk Maxwell Telescope B-Fields In Star-forming Regi…
Maps of Magnetic Field Strength in the OMC-1 using HAWC+ FIR Polarimetric data
Jordan A. Guerra, David T. Chuss, C. Darren Dowell +4
Far-infrared (FIR) dust polarimetry enables the study of interstellar magnetic fields via tracing of the polarized emission from dust grains that are partially aligned with the dir…
Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds
Hua-bai Li, Martin Houde
We study the turbulent velocity dispersion spectra of the coexistent HCN and HCO+ molecular species as a function of length scale in the M17 star-forming molecular cloud. We show t…
Parametric processes in nonlinear structures with reflections: a transfer matrix method approach
Salvador Poveda-Hospital, Tadeu Tassis, Yves-Alain Peter +2
The Transfer Matrix Method is a powerful numerical tool for simulating wave propagation in layered media. It has been widely applied in many fields, although its use is typically r…
Quantum Fisher information analysis for absorption measurements with undetected photons
Martin Houde, Franz Roeder, Christine Silberhorn +2
We theoretically compare the quantum Fisher information (QFI) for three configurations of absorption spectroscopy with undetected idler photons: an SU(1,1) interferometer with inte…
Probing the Magnetic Field with Molecular Ion Spectra
Martin Houde, Pierre Bastien, Ruisheng Peng +2
Observations of the effect of the magnetic field on its environment are usually achieved with techniques which rely on the interaction with the spin of the particles under study. B…
Alignment Between Flattened Protostellar Infall Envelopes and Ambient Magnetic Fields
Nicholas L. Chapman, Jacqueline A. Davidson, Paul F. Goldsmith +10
We present 350 micron polarization observations of four low-mass cores containing Class 0 protostars: L483, L1157, L1448-IRS2, and Serp-FIR1. This is the second paper in a larger s…
Dispersion of Magnetic Fields in Molecular Clouds. I
Roger H. Hildebrand, Larry Kirby, Jessie L. Dotson +2
We describe a method for determining the dispersion of magnetic field vectors about large-scale fields in turbulent molecular clouds. The method is designed to avoid inaccurate est…
The Apparent Velocity and Acceleration of Relativistically Moving Objects
Austen Berlet, Dennis G. C. McKeon, Farrukh Chishtie +1
Although special relativity limits the actual velocity of a particle to , the velocity of light, the observed velocity need not be the same as the actual velocity as the observe…
Gain-induced group delay in spontaneous parametric down-conversion
Guillaume Thekkadath, Martin Houde, Duncan England +4
Strongly-driven nonlinear optical processes such as spontaneous parametric down-conversion and spontaneous four-wave mixing can produce multiphoton nonclassical beams of light whic…
High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons
Martin Houde, Franz Roeder, Christine Silberhorn +2
We study theoretically how high-gain effects affect the measurement outcome of visible signal spectra in undetected photon measurement schemes. We consider two interferometric conf…
A First Look at BISTRO Observations of The Oph-A core
Jungmi Kwon, Yasuo Doi, Motohide Tamura +119
We present 850 m imaging polarimetry data of the Oph-A core taken with the Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2), as part of ou…
Tracing Turbulent Ambipolar Diffusion in Molecular Clouds
Hua-bai Li, Martin Houde, Shih-ping Lai +1
Though flux freezing is a good approximation frequently assumed for molecular clouds, ambipolar diffusion (AD) is inevitable at certain scales. The scale at which AD sets in can be…
Parametric processes in nonlinear structures with reflections: an asymptotic-field approach
Tadeu Tassis, Salvador Poveda-Hospital, Nicolás Quesada +1
The generation of engineered quantum states of light via nonlinear processes is fundamental for quantum technologies based on photons. Although embedding nonlinear materials within…
A Joint-Chirp-Rate-Time-Frequency Transform for BBH Merger Gravitational Wave Signal Detection
Xiyuan Li, Martin Houde, Jignesh Mohanty +1
Low-latency detection of Binary Black Hole (BBH) and Binary Neutron Star (BNS) merger Gravitational Wave (GW) signals is essential for enabling multi-messenger observations of such…
A simple relationship for the spectro-temporal structure of bursts from FRB 121102
Fereshteh Rajabi, Mohammed A. Chamma, Christopher M. Wyenberg +2
We consider a simple dynamical and relativistic model to explain the spectro-temporal structure often displayed by repeating fast radio bursts (FRBs). We show how this model can ac…
Revealing the diverse magnetic field morphologies in Taurus dense cores with sensitive sub-millimeter polarimetry
Chakali Eswaraiah, Di Li, Ray S. Furuya +142
We have obtained sensitive dust continuum polarization observations at 850 m in the B213 region of Taurus using POL-2 on SCUBA-2 at the James Clerk Maxwell Telescope (JCMT), as…
Characterization of Turbulence from Submillimeter Dust Emission
Shadi Chitsazzadeh, Martin Houde, Roger H. Hildebrand +1
In this paper we use our recent technique for estimating the turbulent component of the magnetic field to derive the structure functions of the unpolarized emission as well as that…
Topological quantum fluctuations and travelling wave amplifiers
Vittorio Peano, Martin Houde, Florian Marquardt +1
It is now well-established that photonic systems can exhibit topological energy bands; similar to their electronic counterparts, this leads to the formation of chiral edge modes wh…
Dispersion of Magnetic Fields in Molecular Clouds. III
Martin Houde, Ramprasad Rao, John E. Vaillancourt +1
We apply our technique on the dispersion of magnetic fields in molecular clouds to high spatial resolution Submillimeter Array polarization data obtained for Orion KL in OMC-1, IRA…
Observations of Carbon Radio Recombination Lines with the NenuFAR telescope. I. Cassiopeia A and Cygnus A
Lucie Cros, Antoine Gusdorf, Philippe Salomé +26
Carbon Radio Recombination Lines (CRRLs) at decametre wavelengths trace the diffuse phase of the interstellar medium (ISM) of the Galaxy. Their observation allows to measure physic…
The JCMT BISTRO Survey: An 850/450m Polarization Study of NGC 2071IR in OrionB
A-Ran Lyo, Jongsoo Kim, Sarah Sadavoy +143
We present the results of simultaneous 450 m and 850 m polarization observations toward the massive star forming region NGC 2071IR, a target of the BISTRO (B-fields in Star…
Explaining Recurring Maser Flares in the ISM Through Large-scale Entangled Quantum Mechanical States
Fereshteh Rajabi, Martin Houde
We apply Dicke's theory of superradiance introduced in 1954 to the methanol 6.7 GHz and water 22 GHz spectral lines, often detected in molecular clouds as signposts for the early s…
Astronomical masers and Dicke's superradiance
Fereshteh Rajabi, Martin Houde
We consider the radiation properties and processes of a gas with a population inversion using the formalism based on the Maxwell-Bloch equations. We focus on the maser action and D…
Variability, flaring and coherence -- the complementarity of the maser and superradiance regimes
Martin Houde, Fereshteh Rajabi, Gordon C. MacLeod +5
We discuss the role that coherence phenomena can have on the intensity variability of spectral lines associated with maser radiation. We do so by introducing the fundamental cooper…
Superradiance from a Relativistic Source
Christopher Wyenberg, Fereshteh Rajabi, Martin Houde
We construct a model of cooperative superradiant emission from a highly relativistic multi-particle source. We revise an existing model of the literature for a relativistic two-lev…
Polarizing Grids, Their Assemblies and Beams of Radiation
Martin Houde, Rachel L. Akeson, John E. Carlstrom +3
This article gives an analysis of the behavior of polarizing grids and reflecting polarizers by solving Maxwell's equations, for arbitrary angles of incidence and grid rotation, fo…
Dispersion of Magnetic Fields in Molecular Clouds. IV - Analysis of Interferometry Data
Martin Houde, Charles L. H. Hull, Richard L. Plambeck +2
We expand on the dispersion analysis of polarimetry maps toward applications to interferometry data. We show how the filtering of low-spatial frequencies can be accounted for withi…
Transient Structure in the Non-linear Superradiance Regime of Widely Doppler Broadened Media
Christopher Wyenberg, Fereshteh Rajabi, Mohammed Chamma +2
We investigate transient radiation processes in the non-linear superradiance (SR) regime of the Doppler broadened Maxwell-Bloch equations when the velocity distribution is of total…
The JCMT BISTRO Survey: The Magnetic Field In The Starless Core Ophiuchus C
Junhao Liu, Keping Qiu, David Berry +128
We report 850~m dust polarization observations of a low-mass (12 ) starless core in the Ophiuchus cloud, Ophiuchus C, made with the POL-2 instrument on th…
Dicke's Superradiance in Astrophysics. I -- The 21 cm Line
Fereshteh Rajabi, Martin Houde
We have applied the concept of superradiance introduced by Dicke in 1954 to astrophysics by extending the corresponding analysis to the magnetic dipole interaction characterizing t…
Ultrashort-pulse-pumped, single-mode type-0 squeezers in lithium niobate nanophotonics
Martin Houde, Liam Beaudoin, Robert Kwolek +3
We present design principles for ultrashort-pulse, type-0 phase-matched optical parametric amplifiers to generate and measure spectrally pure degenerate squeezed light. We consider…
On the Measurement of the Magnitude and Orientation of the Magnetic Field in Molecular Clouds
Martin Houde, Pierre Bastien, Jessie L. Dotson +6
We demonstrate that the combination of Zeeman, polarimetry and ion-to-neutral molecular line width ratio measurements permits the determination of the magnitude and orientation of…
Waveguided sources of consistent, single-temporal-mode squeezed light: the good, the bad, and the ugly
Martin Houde, Nicolás Quesada
We study theoretically how the brightness of pumps, with fixed profiles, affects the temporal mode structure of squeezed states generated by fixed parametric waveguided sources. We…
The generation and transformation of polarisation signals in molecular lines through collective anisotropic resonant scattering
Martin Houde, Boy Lankhaar, Fereshteh Rajabi +1
We discuss the existence of elliptical polarisation in rotational spectral lines of CO and other molecules within the context of the Anisotropic Resonant Scattering (ARS) model. We…
Impact of propagation effects on the spectro-temporal properties of Fast Radio Bursts
Aishwarya Kumar, Fereshteh Rajabi, Martin Houde
We present a mathematical analysis of propagation-induced distortions in the spectro-temporal properties of Fast Radio Bursts (FRBs). Within the Triggered Relativistic Dynamical Mo…
Topological phase transitions and chiral inelastic transport induced by the squeezing of light
Vittorio Peano, Martin Houde, Christian Brendel +2
We show how the squeezing of light can lead to the formation of topological states. Such states are characterized by non-trivial Chern numbers, and exhibit protected edge modes whi…
Magnetically regulated collapse in the B335 protostar? II. Observational constraints on gas ionization and magnetic field coupling
Victoria Cabedo, Anaelle Maury, Josep Miquel Girart +4
Non-ideal magnetohydrodynamic effects that rule the coupling of the magnetic field to the circumstellar gas during the low-mass star formation process depend heavily on the local p…
Magnetic Fields and Infall Motions in NGC 1333 IRAS 4
Michael Attard, Martin Houde, Giles Novak +5
We present single-dish 350 micron dust continuum polarimetry as well as HCN and HCO+ J=4-3 rotational emission spectra obtained on NGC 1333 IRAS 4. The polarimetry indicates a unif…
ALMA observations of dust polarization and molecular line emission from the Class 0 protostellar source Serpens SMM1
Charles L. H. Hull, Josep M. Girart, Åukasz Tychoniec +10
We present high angular resolution dust polarization and molecular line observations carried out with the Atacama Large Millimeter/submillimeter Array (ALMA) toward the Class 0 pro…
Quantum coherence and the invisible Universe: Subradiance as a dark matter mechanism
Martin Houde, Fereshteh Rajabi, Lamies Sati +1
The origin of dark matter in galactic halos, one of the deepest unsolved problems in astrophysics, may find an unexpected contribution from the quantum mechanics of ordinary atomic…
Observational Determination of the Turbulent Ambipolar Diffusion Scale and Magnetic Field Strength in Molecular Clouds
Talayeh Hezareh, Martin Houde, Carolyn McCoey +1
We study the correlation of the velocity dispersion of the coexisting molecules H13CN and H13CO+ and the turbulent energy dissipation scale in the DR21(OH) star-forming region. The…
The Removal of Artificially Generated Polarization in SHARP Maps
Michael Attard, Martin Houde, Giles Novak +1
We characterize the problem of artificial polarization for the Submillimeter High Angular Resolution Polarimeter (SHARP) through the use of simulated data and observations made at…
First BISTRO observations of the dark cloud Taurus L1495A-B10: the role of the magnetic field in the earliest stages of low-mass star formation
Derek Ward-Thompson, Janik Karoly, Kate Pattle +155
We present BISTRO Survey 850 μm dust emission polarisation observations of the L1495A-B10 region of the Taurus molecular cloud, taken at the JCMT. We observe a roughly triangular…
Non-Zeeman Circular Polarization of Molecular Maser Spectral Lines
Martin Houde
We apply the anisotropic resonant scattering model developed to explain the presence of non-Zeeman circular polarization signals recently detected in the $^{12}\mathrm{CO}\;\left(J…
Probing the Turbulent Ambipolar Diffusion Scale in Molecular Clouds with Spectroscopy
Talayeh Hezareh, Timea Csengeri, Martin Houde +2
We estimate the turbulent ambipolar diffusion length scale and magnetic field strength in the massive dense cores CygX-N03 and CygX-N53, located in the Cygnus-X star-forming region…
The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2
Jihye Hwang, Jongsoo Kim, Kate Pattle +157
We present and analyze observations of polarized dust emission at 850 m towards the central 1 pc 1 pc hub-filament structure of Monoceros R2 (Mon R2). The data are obt…
JCMT BISTRO survey: Magnetic Fields within the Hub-Filament Structure in IC 5146
Jia-Wei Wang, Shih-Ping Lai, Chakali Eswaraiah +130
We present the 850 m polarization observations toward the IC5146 filamentary cloud taken using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated pola…
Evaluating the Magnetic Field Strength in Molecular Clouds
Martin Houde
We discuss an extension to the Chandrasekhar-Fermi method for the evaluation of the mean magnetic field strength in molecular clouds to cases where the spatial orientation of the f…
Magnetic fields towards Ophiuchus-B derived from SCUBA-2 polarization measurements
Archana Soam, Kate Pattle, Derek Ward-Thompson +121
We present the results of dust emission polarization measurements of Ophiuchus-B (Oph-B) carried out using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its…
Polarisation Observations of VY Canis Majoris Water Vapour 5{32}-4{41} 620.701 GHz Maser Emission with HIFI
Martin Harwit, Martin Houde, Paule Sonnentrucker +26
CONTEXT: Water vapour maser emission from evolved oxygen-rich stars remains poorly understood. Additional observations, including polarisation studies and simultaneous observation…
The Submillimetre Universe
Douglas Scott, Pauline Barmby, Pierre Bastien +19
Submillimetre continuum radiation allows us to probe cold objects, particularly the earliest, dusty phases of star formation, high-redshift galaxies and circumstellar disks. The su…
Machine-learning approaches to dispersion measure estimation for fast radio bursts
Hosein Rajabi, Zhejian Liu, Fereshteh Rajabi +1
Fast radio bursts (FRBs) are bright, mostly millisecond-duration transients of extragalactic origin whose emission mechanisms remain unknown. As FRB signals propagate through ioniz…
Controlling a Telescope Chopping Secondary Mirror Assembly Using a Signal Deconvolution Technique
Martin Houde, Lynn C. Holt, Hiroshige Yoshida +1
We describe a technique for improving the response of a telescope chopping secondary mirror assembly by using a signal processing method based on the Lucy deconvolution technique.…
The JCMT BISTRO-2 Survey: Magnetic Fields of the Massive DR21 Filament
Tao-Chung Ching, Keping Qiu, Di Li +154
We present 850 m dust polarization observations of the massive DR21 filament from the B-fields In STar-forming Region Observations (BISTRO) survey, using the POL-2 polarimeter…
Evidence of a shared spectro-temporal law between sources of repeating fast radio bursts
Mohammed A. Chamma, Fereshteh Rajabi, Christopher M. Wyenberg +2
We study the spectro-temporal characteristics of two repeating fast radio bursts (FRBs), namely, FRB 20180916B and FRB 20180814A, and combine the results with those from our earlie…
A Four-Stokes-Parameter Spectral Line Polarimeter at the Caltech Submillimeter Observatory
Talayeh Hezareh, Martin Houde
We designed and built a new Four-Stokes-Parameter spectral line Polarimeter (FSPPol) for the Caltech Submillimeter Observatory (CSO). The simple design of FSPPol does not include a…
Astronomical Image Processing with Array Detectors
Martin Houde, John E. Vaillancourt
We address the question of astronomical image processing from data obtained with array detectors. We define and analyze the cases of evenly, regularly, and irregularly sampled maps…
Observations of magnetic fields surrounding LkH 101 taken by the BISTRO survey with JCMT-POL-2
Nguyen Bich Ngoc, Pham Ngoc Diep, Harriet Parsons +146
We report the first high spatial resolution measurement of magnetic fields surrounding LkH 101, a part of the Auriga-California molecular cloud. The observations were taken wit…
Explaining fast radio bursts through Dicke's superradiance
Martin Houde, Abhilash Mathews, Fereshteh Rajabi
Fast Radio Bursts (FRBs), characterized by strong bursts of radiation intensity at radio wavelengths lasting on the order of a millisecond, have yet to be firmly associated with a…
Validating the Sub-Burst Slope Law: A Comprehensive Multi-Source Spectro-Temporal Analysis of Repeating Fast Radio Bursts
Katie Brown, Mohammed A. Chamma, Fereshteh Rajabi +3
We conduct a comprehensive spectro-temporal analysis of repeating Fast Radio Bursts (FRBs) utilizing nine distinct sources, the largest sample to date. Our data set includes 175 su…
First results from BISTRO -- a SCUBA-2 polarimeter survey of the Gould Belt
Derek Ward-Thompson, Kate Pattle, Pierre Bastien +111
We present the first results from the B-fields In STar-forming Region Observations (BISTRO) survey, using the Sub-millimetre Common-User Bolometer Array 2 (SCUBA-2) camera, with it…
The Hertz/VPM polarimeter: Design and first light observations
Megan Krejny, David Chuss, Christian Drouet d'Aubigny +10
We present first results of Hertz/VPM, the first submillimeter polarimeter employing the dual Variable-delay Polarization Modulator (dual-VPM). This device differs from previously…