HAWC+, the Far-Infrared Camera and Polarimeter for SOFIA

Harper, D. A.; Runyan, M. C.; Dowell, C. D.; Wirth, C.; Amato, M.; Ames, Troy; Amiri, M.; Banks, S.; Bartels, A.; Benford, Dominic J.; Berthoud, Marc; Buchanan, Ernest D.; Casey, S. C.; Chapman, Nicholas; Chuss, David T.; Cook, Brant; Derro, Rebecca J.; Dotson, Jessie L.; Evans, R.; Fixsen, D. J.; Gatley, I.; Guerra, Jordan A.; Halpern, M.; Hamilton, Ryan; Hamlin, Louise A.; Hansen, Christopher J.; Heimsath, S.; Hermida, Alfonso; Hilton, G. C.; Hirsch, Robert; Hollister, Matthew I.; Hostetter, Carl F.; Irwin, K. D.; Jhabvala, Christine A.; Jhabvala, M.; Kastner, Joel H.; Kovács, A.; Lin, Sean; Loewenstein, R. F.; Looney, Leslie W.; López-Rodríguez, Enrique; Maher, Stephen F.; Michail, Joseph M.; Miller, Timothy M.; Moseley, S. H.; Novak, Giles; Pernic, R.; Rennick, Timothy S.; Rhody, Harvey; Sandberg, E.; Sandford, Dale; Santos, Fábio P.; Shafer, R. A.; Sharp, Elmer H.; Shirron, Peter; Siah, Javad; Silverberg, R. F.; Sparr, Leroy; Spotz, Robert; Staguhn, Johannes; Toorian, Armen; Towey, Shannon; Tuttle, James; Vaillancourt, John E.; Voellmer, George M.; Volpert, Carolyn G.; Wang, Shu I.; Wollack, Edward J.

doi:10.1142/s2251171718400081

Cited by 113 publications

(113 citation statements)

References 26 publications

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“…Polarimetric data for ρ Oph A were obtained using HAWC+/SOFIA (Harper et al 2018) on May 5 2017 as part of the Guaranteed Time Observing (GTO) program. We used HAWC+ bands C (89 µm) and D (154 µm) that nominally provide angular resolutions of 7.8 and 13.6 FWHM (full width at half maximum), respectively.…”

Section: Observationsmentioning

confidence: 99%

“…The newly commissioned HAWC+ far-IR polarimeter for SOFIA (Dowell et al 2010;Harper et al 2018) allows us to revisit the topic of molecular cloud far-IR polarization spectra, but with better angular resolution and sensitivity. In this work, we present polarimetric observations of the nearby star forming region ρ Oph A obtained with HAWC+ at two different far-IR wavelengths, 89 µm and 154 µm.…”

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confidence: 99%

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The Far-infrared Polarization Spectrum of ρ Ophiuchi A from HAWC+/SOFIA Observations

Santos

Chuss

Dowell

et al. 2019

ApJ

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We report on polarimetric maps made with HAWC+/SOFIA toward ρ Oph A, the densest portion of the ρ Ophiuchi molecular complex. We employed HAWC+ bands C (89 µm) and D (154 µm). The slope of the polarization spectrum was investigated by defining the quantity R DC = p D /p C , where p C and p D represent polarization degrees in bands C and D, respectively. We find a clear correlation between R DC and the molecular hydrogen column density across the cloud. A positive slope (R DC > 1) dominates the lower density and well illuminated portions of the cloud, that are heated by the high mass star Oph S1, whereas a transition to a negative slope (R DC < 1) is observed toward the denser

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Section: Observationsmentioning

confidence: 99%

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confidence: 99%

The Far-infrared Polarization Spectrum of ρ Ophiuchi A from HAWC+/SOFIA Observations

Santos

Chuss

Dowell

et al. 2019

ApJ

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“…The polarimetry observations were carried out with the SOFIA telescope, using the HAWC+ instrument (Harper et al 2018) in summer 2018. We used the band E, with a nominal wavelength of 214 µm (1.4 THz).…”

Section: Polarimetric Datamentioning

confidence: 99%

Magnetic properties of the protostellar core IRAS 15398-3359

Redaelli

Alves

Santos

et al. 2019

A&A

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Context. Magnetic fields can affect significantly the star formation process. The theory of the magnetically-driven collapse in a uniform field predicts that initially the contraction happens along the field lines. When the gravitational pull grows strong enough, the magnetic field lines pinch inwards, giving rise to a characteristic hourglass shape. Aims. We investigate the magnetic field structure of a young Class 0 object, IRAS 15398-3359, embedded in the Lupus I cloud. Previous observations at large scales suggest that this source evolved in an highly magnetised environment. This object thus appears an ideal candidate to study the magnetically driven core collapse in the low-mass regime. Methods. We have performed polarisation observations of IRAS 15398-3359 at 214 µm using the SOFIA/HAWC+ instrument, thus tracing the linearly polarised thermal emission of cold dust. Results. Our data unveil a significant bend of the magnetic field lines due to the gravitational pull. The magnetic field appears ordered and aligned with the large-scale B-field of the cloud and with the outflow direction. We estimate a magnetic field strength of B = 78 µG, expected to be accurate within a factor of two. The measured mass-to-flux parameter is λ = 0.95, indicating that the core is in a transcritical regime.

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“…The arrays are heat-sunk to the package through gold bonds to a diamond-turned, goldplated boss in the package. This design 35 follows heritage from HAWC+ 36 .…”

Section: B 100 Mk Stagementioning

confidence: 99%

Sub-Kelvin cooling for two kilopixel bolometer arrays in the PIPER receiver

Switzer

Ade

Baildon

et al. 2019

Review of Scientific Instruments

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The Primordial Inflation Polarization Explorer (PIPER) is a balloon-borne telescope mission to search for inflationary gravitational waves from the early universe. PIPER employs two 32 × 40 arrays of superconducting transition-edge sensors, which operate at 100 mK. An open bucket dewar of liquid helium maintains the receiver and telescope optics at 1.7 K. We describe the thermal design of the receiver and sub-kelvin cooling with a continuous adiabatic demagnetization refrigerator (CADR). The CADR operates between 70 − 130 mK and provides ≈10 µW cooling power at 100 mK, nearly five times the loading of the two detector assemblies. We describe electronics and software to robustly control the CADR, overall CADR performance in flight-like integrated receiver testing, and practical considerations for implementation in the balloon float environment.

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HAWC+, the Far-Infrared Camera and Polarimeter for SOFIA

Cited by 113 publications

References 26 publications

The Far-infrared Polarization Spectrum of ρ Ophiuchi A from HAWC+/SOFIA Observations

The Far-infrared Polarization Spectrum of ρ Ophiuchi A from HAWC+/SOFIA Observations

Magnetic properties of the protostellar core IRAS 15398-3359

Sub-Kelvin cooling for two kilopixel bolometer arrays in the PIPER receiver

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