The Simons Observatory: Galactic Science Goals and Forecasts

Abstract

Observing in six frequency bands from 27 to 280 GHz over a large sky area, the Simons Observatory (SO) is poised to address many questions in Galactic astrophysics in addition to its principal cosmological goals. In this work, we provide quantitative forecasts on astrophysical parameters of interest for a range of Galactic science cases. We find that SO can: constrain the frequency spectrum of polarized dust emission at a level of $\Delta {\beta }_d\lesssim 0.01$ and thus test models of dust composition that predict that ${\beta }_d$ in polarization differs from that measured in total intensity; measure the correlation coefficient between polarized dust and synchrotron emission with a factor of two greater precision than current constraints; exclude the non-existence of exo-Oort clouds at roughly 2.9$\sigma$ if the true fraction is similar to the detection rate of giant planets; map more than 850 molecular clouds with at least 50 independent polarization measurements at 1 pc resolution; detect or place upper limits on the polarization fractions of CO(2-1) emission and anomalous microwave emission at the 0.1% level in select regions; and measure the correlation coefficient between optical starlight polarization and microwave polarized dust emission in $1^{\circ }$ patches for all lines of sight with $N_{\mathrm{H}}\gtrsim 2\times 10^{20}$ cm${}^{-2}$. The goals and forecasts outlined here provide a roadmap for other microwave polarization experiments to expand their scientific scope via Milky Way astrophysics.

arXiv commentSubmitted to AAS journals. 33 pages, 10 figures

References in corpus (189)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The NumPy array: a structure for efficient numerical computation
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Efficient Computation of CMB anisotropies in closed FRW models
• Theory of Star Formation
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
• The Milky Way in Molecular Clouds: A New Complete CO Survey
• Control of star formation by supersonic turbulence
• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• The Simons Observatory: Science goals and forecasts
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Interstellar Turbulence I: Observations and Processes
• New Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
• Star Clusters Across Cosmic Time
• The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
• A New Model of the Galactic Magnetic Field
• Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS
• Planck Early Results: The Planck mission
• BICEP2 / Keck Array x: Constraints on Primordial Gravitational Waves using Planck, WMAP, and New BICEP2/Keck Observations through the 2015 Season
• Determination of Inflationary Observables by Cosmic Microwave Background Anisotropy Experiments
• Electric Dipole Radiation from Spinning Dust Grains
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
• CMB-S4 Science Case, Reference Design, and Project Plan
• Evidence for a Distant Giant Planet in the Solar System
• Planck 2018 results. IV. Diffuse component separation
• Planck intermediate results. XXXV. Probing the role of the magnetic field in the formation of structure in molecular clouds
• A unified pseudo-$C_{\ell }$ framework
• Physical properties of molecular clouds for the entire Milky Way disk
• A Super-Alfvenic Model of Dark Clouds
• Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc
• The Quest for B Modes from Inflationary Gravitational Waves
• Diffuse Galactic Emission from Spinning Dust Grains
• Debris Disks: Structure, Composition, and Variability
• The Big Problems in Star Formation: the Star Formation Rate, Stellar Clustering, and the Initial Mass Function
• The global dust modelling framework THEMIS (The Heterogeneous dust Evolution Model for Interstellar Solids)
• Planck intermediate results. LVII. Joint Planck LFI and HFI data processing
• CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
• Measurements of the E-Mode Polarization and Temperature-E-Mode Correlation of the CMB from SPT-3G 2018 Data
• Hints for a Turnover at the Snow Line in the Giant Planet Occurrence Rate
• An Imprint of Molecular Cloud Magnetization in the Morphology of the Dust Polarized Emission
• An Anomalous Component of Galactic Emission
• Inefficient star formation through turbulence, magnetic fields and feedback
• The Python Sky Model: software for simulating the Galactic microwave sky
• Detection and Characterization of Cold Interstellar Dust and PAH Emission from COBE Observations
• Magnetically Aligned HI Fibers and the Rolling Hough Transform
• Planck 2013 results. XIII. Galactic CO emission
• The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters
• Magnetic Dipole Microwave Emission from Dust Grains
• Planck 2018 results. XI. Polarized dust foregrounds
• Density Studies of MHD Interstellar Turbulence: Statistical Moments, Correlations and Bispectrum
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Planets and Celestial Calibration Sources
• Planck 2018 results. XII. Galactic astrophysics using polarized dust emission
• Planck intermediate results. XXII. Frequency dependence of thermal emission from Galactic dust in intensity and polarization
• The Atacama Cosmology Telescope: likelihood for small-scale CMB data
• Polarized Far-Infrared and Submillimeter Emission from Interstellar Dust
• Is Turbulence in the Interstellar Medium Driven by Feedback or Gravity? An Observational Test
• Planck intermediate results. XX. Comparison of polarized thermal emission from Galactic dust with simulations of MHD turbulence
• The Planet Nine Hypothesis
• A refined model for spinning dust radiation
• Low-Mach-number turbulence in interstellar gas revealed by radio polarization gradients
• MILCA, a Modified Internal Linear Combination Algorithm to extract astrophysical emissions from multi-frequency sky maps
• Shaping the Kuiper belt size spectrum by shattering large but strengthless bodies
• Molecular Cloud Evolution IV: Magnetic Fields, Ambipolar Diffusion, and the Star Formation Efficiency
• Magnetic Nanoparticles in the Interstellar Medium: Emission Spectrum and Polarization
• Planck Early Results: Origin of the submm excess dust emission in the Magellanic Clouds
• Galactic microwave emission at degree angular scales
• A new, large-scale map of interstellar reddening derived from HI emission
• Cool Jupiters greatly outnumber their toasty siblings: Occurrence rates from the Anglo-Australian Planet Search
• LiteBIRD: JAXA's new strategic L-class mission for all-sky surveys of cosmic microwave background polarization
• The Physics of Star Cluster Formation and Evolution
• Quiescent Cores and the Efficiency of Turbulence-Accelerated, Magnetically Regulated Star Formation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Bayesian Estimation of CMB Polarization Maps
• Neutral hydrogen structures trace dust polarization angle: Implications for cosmic microwave background foregrounds
• Observational Constraints on the Physical Properties of Interstellar Dust in the Post-Planck Era
• What are we learning from the relative orientation between density structures and the magnetic field in molecular clouds?
• The Demographics of Long-Period Comets
• Balloon-Borne Submillimeter Polarimetry of the Vela C Molecular Cloud: Systematic Dependence of Polarization Fraction on Column Density and Local Polarization-Angle Dispersion
• Dust in the diffuse interstellar medium: Extinction, emission, linear and circular polarisation
• The Websky Extragalactic CMB Simulations
• Submillimeter to centimeter excess emission from the Magellanic Clouds. II. On the nature of the excess
• Maximum Likelihood algorithm for parametric component separation in CMB experiments
• The State-of-Play of Anomalous Microwave Emission (AME) Research
• A Complete ALMA Map of the Fomalhaut Debris Disk
• Mapping the Magnetic Interstellar Medium in Three Dimensions Over the Full Sky with Neutral Hydrogen
• Planck intermediate results. XXI. Comparison of polarized thermal emission from Galactic dust at 353 GHz with interstellar polarization in the visible
• Dust models compatible with Planck intensity and polarization data in translucent lines of sight
• The mass-Peak Patch algorithm for fast generation of deep all-sky dark matter halo catalogues and its N-Body validation
• The S-PASS view of polarized Galactic Synchrotron at 2.3 GHz as a contaminant to CMB observations
• The Dielectric Function of "Astrodust" and Predictions for Polarization in the 3.4$\mu$m and 10$\mu$m Features
• Modulation of CMB polarization with a warm rapidly-rotating half-wave plate on the Atacama B-Mode Search (ABS) instrument
• Constraints on $\Lambda$CDM Extensions from the SPT-3G 2018 $EE$ and $TE$ Power Spectra
• GHIGLS: HI mapping at intermediate Galactic latitude using the Green Bank Telescope
• The nature of the E-B decomposition of CMB polarization
• Sub-millimeter to centimeter excess emission from the Magellanic Clouds. I. Global spectral energy distribution
• S-band Polarization All Sky Survey (S-PASS): survey description and maps
• Cold Milky Way Hi gas in filaments
• Physical Processes in Star Formation
• From parallel to perpendicular -- On the orientation of magnetic fields in molecular clouds
• An application of an optimal statistic for characterising relative orientations
• The Submm and mm Excess of the SMC: Magnetic Dipole Emission from Magnetic Nanoparticles?
• Modeling the Anomalous Microwave Emission with Spinning Nanoparticles: No PAHs Required
• Relative Alignment Between the Magnetic Field and Molecular Gas Structure in the Vela C Giant Molecular Cloud using Low and High Density Tracers
• The structure and statistics of interstellar turbulence
• The Effects of Magnetic Fields and Protostellar Feedback on Low-mass Cluster Formation
• Properties of Interstellar Turbulence from Gradients of Linear Radio Polarization Maps
• Matching dust emission structures and magnetic field in high-latitude cloud L1642: comparing Herschel and Planck maps
• The Origin of Parity Violation in Polarized Dust Emission and Implications for Cosmic Birefringence
• QUIJOTE Scientific Results. II. Polarisation Measurements of the Microwave Emission in the Galactic molecular complexes W43 and W47 and supernova remnant W44
• BICEP2 III: Instrumental Systematics
• The magnetic field and dust filaments in the Polaris Flare
• The Local Bubble: a magnetic veil to our Galaxy
• Synchrotron Spectral Curvature from 22 MHz to 23 GHz
• Characterization of foreground emission at degree angular scale for CMB B-modes observations. Thermal Dust and Synchrotron signal from Planck and WMAP data
• Polarized galactic synchrotron and dust emission and their correlation
• The C-Band All-Sky Survey (C-BASS): Design and capabilities
• The Atacama Cosmology Telescope: Beam Measurements and the Microwave Brightness Temperatures of Uranus and Saturn
• Far-Infrared to Millimeter Astrophysical Dust Emission. II: Comparison of the Two-Level Systems (TLS) model with Astronomical Data
• Cold gas outflows from the Small Magellanic Cloud traced with ASKAP
• Evidence for Line-of-Sight Frequency Decorrelation of Polarized Dust Emission in $Planck$ Data
• Galactic foreground contributions to the WMAP5 maps
• Constraint on the Polarization of Electric Dipole Emission from Spinning Dust
• Dust-polarization maps for local interstellar turbulence
• Dust polarization and ISM turbulence
• Two Bipolar Outflows and Magnetic Fields in a Multiple Protostar System, L1448 IRS 3
• A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing
• Alfvenic Turbulence Beyond the Ambipolar Diffusion Scale
• Modelling and simulation of large-scale polarized dust emission over the southern Galactic cap using the GASS HI data
• Sensitivity of the Prime-Cam Instrument on the CCAT-prime Telescope
• Dust Polarization Maps from TIGRESS: E/B power asymmetry and TE correlation
• Quantum Suppression of Alignment in Ultrasmall Grains: Microwave Emission from Spinning Dust will be Negligibly Polarized
• Statistical description of dust polarized emission from the diffuse interstellar medium -- A RWST approach
• A new probe of line-of-sight magnetic field tangling
• Bayesian component separation and CMB estimation for the 5-year WMAP temperature data
• Detection of Galactic and Extragalactic Millimeter-Wavelength Transient Sources with SPT-3G
• SPIDER: A Balloon-borne Large-scale CMB Polarimeter
• The Power Spectra of Polarized, Dusty Filaments
• Polarized CO emission from molecular clouds
• The Simons Observatory: gain, bandpass and polarization-angle calibration requirements for B-mode searches
• Paramagnetic alignment of small grains: a novel method for measuring interstellar magnetic fields
• Extreme Starlight Polarization in a Region with Highly Polarized Dust Emission
• A measurement of the CMB E-mode angular power spectrum at subdegree scales from 670 square degrees of POLARBEAR data
• First Observation of the Submillimeter Polarization Spectrum in a Translucent Molecular Cloud
• Using the Starlight Polarization Efficiency Integral to Constrain Shapes and Porosities of Interstellar Grains
• Planck intermediate results. LII. Planet flux densities
• The Atacama Cosmology Telescope: Microwave Intensity and Polarization Maps of the Galactic Center
• The Simons Observatory: Modeling Optical Systematics in the Large Aperture Telescope
• Polarization of thermal molecular lines in the envelope of IK Tau
• PASIPHAE: A high-Galactic-latitude, high-accuracy optopolarimetric survey
• The Atacama Cosmology Telescope: Detection of mm-wave transient sources
• Local Bubble contribution to the 353-GHz dust polarized emission
• Interferometric Mapping of Magnetic Fields: The massive star forming region G34.4+0.23 MM
• Small Aperture Telescopes for the Simons Observatory
• Non-Zeeman Circular Polarization of Molecular Rotational Spectral Lines
• Detection of Spectral Variations of Anomalous Microwave Emission with QUIJOTE and C-BASS
• Resolving Structure in the Debris Disk around HD 206893 with ALMA
• Magnetic Field Orientation in Self-Gravitating Turbulent Molecular Clouds
• A 3D model for CO molecular line emission as a potential CMB polarization contaminant
• The Atacama Cosmology Telescope: A search for Planet 9
• Constraints on the spectral index of polarized synchrotron emission from WMAP and Faraday-corrected S-PASS data
• Non-Zeeman Circular Polarization of CO rotational lines in SNR IC 443
• Full-sky, arcminute-scale, 3D models of Galactic microwave foreground dust emission based on filaments
• Statistics of the Chemical Composition of Solar Analog Stars and Links to Planet Formation
• Studies of Systematic Uncertainties for Simons Observatory: Detector Array Effects
• Designs for next generation CMB survey strategies from Chile
• Tracing Magnetic Field with Synchrotron Polarization Gradients: Parameter Study
• Instrumental systematics biases in CMB lensing reconstruction: a simulation-based assessment
• Lensing simulations by Taylor expansion -- not so inefficient after all
• Maps of the Magellanic Clouds from Combined South Pole Telescope and Planck Data
• Advanced Diagnostics for the Study of Linearly Polarized Emission. II: Application to Diffuse Interstellar Radio Synchrotron Emission
• Probing Oort clouds around Milky Way stars with CMB surveys
• Discovery of Molecular Line Polarization in the Disk of TW Hya
• Detection of Polarized Infrared Emission by Polycyclic Aromatic Hydrocarbons in the MWC 1080 Nebula
• The Simons Observatory: the Large Aperture Telescope (LAT)
• A new perspective on turbulent Galactic magnetic fields through comparison of linear polarisation decomposition techniques
• An Examination of Galactic Polarization with Application to the Planck TB Correlation
• Spin characterisation of systematics in CMB surveys -- a comprehensive formalism
• Simons Observatory Small Aperture Telescope overview
• The link between E-B polarization modes and gas column density from interstellar dust emission
• The POLARBEAR Fourier Transform Spectrometer Calibrator and Spectroscopic Characterization of the POLARBEAR Instrument
• Characterising the Magnetic Fields of Nearby Molecular Clouds using Submillimeter Polarization Observations
• Mapping circumstellar magnetic fields of late-type evolved stars with the Goldreich-Kylafis effect: CARMA observations at $\lambda 1.3$ mm of R Crt and R Leo
• Maser emission from the CO envelope of the asymptotic giant branch star W Hydrae
• Imprint of Distortions in the Oort Cloud on the CMB Anisotropies
• The Statistics of Extended Debris Disks Measured with Gaia and Planck
• The effect of cosmic variance on the characteristics of dust polarization power spectra
• Constraining the Anomalous Microwave Emission Mechanism in the S140 Star Forming Region with Spectroscopic Observations Between 4 and 8 GHz at the Green Bank Telescope
• BeyondPlanck XV. Polarized foreground emission between 30 and 70 GHz
• The Python Sky Model 3 software

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• CMB spectral distortions revisited: a new take on $\mu$ distortions and primordial non-Gaussianities from FIRAS data
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• Full-sky Models of Galactic Microwave Emission and Polarization at Sub-arcminute Scales for the Python Sky Model
• BICEP / Keck XVI: Characterizing Dust Polarization through Correlations with Neutral Hydrogen
• Analysis of Polarized Dust Emission Using Data from the First Flight of SPIDER
• HI filaments as potential compass needles? Comparing the magnetic field structure of the Small Magellanic Cloud to the orientation of GASKAP-HI filaments
• The Atacama Cosmology Telescope: DR6 Power Spectrum Foreground Model and Validation
• Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Resolving the Hot and Ionized Universe through the Sunyaev-Zeldovich effect
• Cosmoglobe DR1. III. First full-sky model of polarized synchrotron emission from all WMAP and Planck LFI data
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• Sensitive 3mm Imaging of Discrete Sources in the Fields of tSZ-Selected Galaxy Clusters
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• The Simons Observatory: Quantifying the impact of beam chromaticity on large-scale B-mode science
• The Hydrostatic Mass Bias and the ${\sigma }_8$ Tension: A Multi-Probe Forecast for Stage-IV/V Surveys
• Extending Galactic foreground emission with neural networks