The atacama cosmology telescope: Two-season ACTPol extragalactic point sources and their polarization properties

Rahul Datta, Simone Aiola, Steve K. Choi, Mark Devlin, Joanna Dunkley, Rolando Dünner, Patricio A. Gallardo, Megan Gralla, Mark Halpern, Matthew Hasselfield, Matt Hilton, Adam D. Hincks, Shuay Pwu P. Ho, Johannes Hubmayr, Kevin M. Huffenberger, John P. Hughes, Arthur Kosowsky, Carlos H. López-Caraballo, Thibaut Louis, Marius LunguTobias Marriage, Loïc Maurin, Jeff McMahon, Kavilan Moodley, Sigurd K. Naess, Federico Nati, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Heather Prince, Suzanne T. Staggs, Eric R. Switzer, Edward J. Wollack, Gerrit Farren

Research output: Contribution to journalArticle

Abstract

We report onmeasurements of the polarization of extragalactic sources at 148GHzmade during the first two seasons of the Atacama Cosmology Telescope Polarization (ACTPol) survey. The survey covered 680 deg2 of the sky on the celestial equator. Polarization measurements of 169 intensity-selected sources brighter than 30 mJy, that are predominantly active galactic nuclei, are presented. Above a total flux of 215 mJy where the noise bias removal in the polarization measurement is reliable, we detect 26 sources, 14 of which have a detection of linear polarization at greater than 3σ significance. The distribution of the fractional polarization as a function of total source intensity is analysed. Our result is consistent with the scenario that the fractional polarization of our measured radio source population is independent of total intensity down to the limits of our measurements and well described by a Gaussian distribution with a mean fractional polarization pm = 0.028 ± 0.005 and standard deviation σpm = 0.054, truncated at p = 0. Extrapolating this model for the distribution of source polarization below the ACTPol detection threshold, we predict that one could get a clean measure of the Emode polarization power spectrum of the microwave background out to l ≈ 6000 with 1 μK-arcminute maps over 10% of the sky from a future survey. We also study the spectral energy distribution of the total and polarized source flux densities by cross-matching with low radio frequency catalogues. We do not find any correlation between the spectral indices for total flux and polarized flux.

Original languageEnglish (US)
Pages (from-to)5239-5262
Number of pages24
JournalMonthly Notices of the Royal Astronomical Society
Volume486
Issue number4
DOIs
StatePublished - Jul 1 2019

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cosmology
point sources
point source
polarization
telescopes
sky
radio
equators
spectral energy distribution
linear polarization
normal density functions
active galactic nuclei
catalogs
power spectra
standard deviation
radio frequencies
flux density
low frequencies
microwaves
thresholds

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Datta, Rahul ; Aiola, Simone ; Choi, Steve K. ; Devlin, Mark ; Dunkley, Joanna ; Dünner, Rolando ; Gallardo, Patricio A. ; Gralla, Megan ; Halpern, Mark ; Hasselfield, Matthew ; Hilton, Matt ; Hincks, Adam D. ; Ho, Shuay Pwu P. ; Hubmayr, Johannes ; Huffenberger, Kevin M. ; Hughes, John P. ; Kosowsky, Arthur ; López-Caraballo, Carlos H. ; Louis, Thibaut ; Lungu, Marius ; Marriage, Tobias ; Maurin, Loïc ; McMahon, Jeff ; Moodley, Kavilan ; Naess, Sigurd K. ; Nati, Federico ; Niemack, Michael D. ; Page, Lyman A. ; Partridge, Bruce ; Prince, Heather ; Staggs, Suzanne T. ; Switzer, Eric R. ; Wollack, Edward J. ; Farren, Gerrit. / The atacama cosmology telescope : Two-season ACTPol extragalactic point sources and their polarization properties. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 486, No. 4. pp. 5239-5262.
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abstract = "We report onmeasurements of the polarization of extragalactic sources at 148GHzmade during the first two seasons of the Atacama Cosmology Telescope Polarization (ACTPol) survey. The survey covered 680 deg2 of the sky on the celestial equator. Polarization measurements of 169 intensity-selected sources brighter than 30 mJy, that are predominantly active galactic nuclei, are presented. Above a total flux of 215 mJy where the noise bias removal in the polarization measurement is reliable, we detect 26 sources, 14 of which have a detection of linear polarization at greater than 3σ significance. The distribution of the fractional polarization as a function of total source intensity is analysed. Our result is consistent with the scenario that the fractional polarization of our measured radio source population is independent of total intensity down to the limits of our measurements and well described by a Gaussian distribution with a mean fractional polarization pm = 0.028 ± 0.005 and standard deviation σpm = 0.054, truncated at p = 0. Extrapolating this model for the distribution of source polarization below the ACTPol detection threshold, we predict that one could get a clean measure of the Emode polarization power spectrum of the microwave background out to l ≈ 6000 with 1 μK-arcminute maps over 10{\%} of the sky from a future survey. We also study the spectral energy distribution of the total and polarized source flux densities by cross-matching with low radio frequency catalogues. We do not find any correlation between the spectral indices for total flux and polarized flux.",
author = "Rahul Datta and Simone Aiola and Choi, {Steve K.} and Mark Devlin and Joanna Dunkley and Rolando D{\"u}nner and Gallardo, {Patricio A.} and Megan Gralla and Mark Halpern and Matthew Hasselfield and Matt Hilton and Hincks, {Adam D.} and Ho, {Shuay Pwu P.} and Johannes Hubmayr and Huffenberger, {Kevin M.} and Hughes, {John P.} and Arthur Kosowsky and L{\'o}pez-Caraballo, {Carlos H.} and Thibaut Louis and Marius Lungu and Tobias Marriage and Lo{\"i}c Maurin and Jeff McMahon and Kavilan Moodley and Naess, {Sigurd K.} and Federico Nati and Niemack, {Michael D.} and Page, {Lyman A.} and Bruce Partridge and Heather Prince and Staggs, {Suzanne T.} and Switzer, {Eric R.} and Wollack, {Edward J.} and Gerrit Farren",
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Datta, R, Aiola, S, Choi, SK, Devlin, M, Dunkley, J, Dünner, R, Gallardo, PA, Gralla, M, Halpern, M, Hasselfield, M, Hilton, M, Hincks, AD, Ho, SPP, Hubmayr, J, Huffenberger, KM, Hughes, JP, Kosowsky, A, López-Caraballo, CH, Louis, T, Lungu, M, Marriage, T, Maurin, L, McMahon, J, Moodley, K, Naess, SK, Nati, F, Niemack, MD, Page, LA, Partridge, B, Prince, H, Staggs, ST, Switzer, ER, Wollack, EJ & Farren, G 2019, 'The atacama cosmology telescope: Two-season ACTPol extragalactic point sources and their polarization properties', Monthly Notices of the Royal Astronomical Society, vol. 486, no. 4, pp. 5239-5262. https://doi.org/10.1093/mnras/sty2934

The atacama cosmology telescope : Two-season ACTPol extragalactic point sources and their polarization properties. / Datta, Rahul; Aiola, Simone; Choi, Steve K.; Devlin, Mark; Dunkley, Joanna; Dünner, Rolando; Gallardo, Patricio A.; Gralla, Megan; Halpern, Mark; Hasselfield, Matthew; Hilton, Matt; Hincks, Adam D.; Ho, Shuay Pwu P.; Hubmayr, Johannes; Huffenberger, Kevin M.; Hughes, John P.; Kosowsky, Arthur; López-Caraballo, Carlos H.; Louis, Thibaut; Lungu, Marius; Marriage, Tobias; Maurin, Loïc; McMahon, Jeff; Moodley, Kavilan; Naess, Sigurd K.; Nati, Federico; Niemack, Michael D.; Page, Lyman A.; Partridge, Bruce; Prince, Heather; Staggs, Suzanne T.; Switzer, Eric R.; Wollack, Edward J.; Farren, Gerrit.

In: Monthly Notices of the Royal Astronomical Society, Vol. 486, No. 4, 01.07.2019, p. 5239-5262.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The atacama cosmology telescope

T2 - Two-season ACTPol extragalactic point sources and their polarization properties

AU - Datta, Rahul

AU - Aiola, Simone

AU - Choi, Steve K.

AU - Devlin, Mark

AU - Dunkley, Joanna

AU - Dünner, Rolando

AU - Gallardo, Patricio A.

AU - Gralla, Megan

AU - Halpern, Mark

AU - Hasselfield, Matthew

AU - Hilton, Matt

AU - Hincks, Adam D.

AU - Ho, Shuay Pwu P.

AU - Hubmayr, Johannes

AU - Huffenberger, Kevin M.

AU - Hughes, John P.

AU - Kosowsky, Arthur

AU - López-Caraballo, Carlos H.

AU - Louis, Thibaut

AU - Lungu, Marius

AU - Marriage, Tobias

AU - Maurin, Loïc

AU - McMahon, Jeff

AU - Moodley, Kavilan

AU - Naess, Sigurd K.

AU - Nati, Federico

AU - Niemack, Michael D.

AU - Page, Lyman A.

AU - Partridge, Bruce

AU - Prince, Heather

AU - Staggs, Suzanne T.

AU - Switzer, Eric R.

AU - Wollack, Edward J.

AU - Farren, Gerrit

PY - 2019/7/1

Y1 - 2019/7/1

N2 - We report onmeasurements of the polarization of extragalactic sources at 148GHzmade during the first two seasons of the Atacama Cosmology Telescope Polarization (ACTPol) survey. The survey covered 680 deg2 of the sky on the celestial equator. Polarization measurements of 169 intensity-selected sources brighter than 30 mJy, that are predominantly active galactic nuclei, are presented. Above a total flux of 215 mJy where the noise bias removal in the polarization measurement is reliable, we detect 26 sources, 14 of which have a detection of linear polarization at greater than 3σ significance. The distribution of the fractional polarization as a function of total source intensity is analysed. Our result is consistent with the scenario that the fractional polarization of our measured radio source population is independent of total intensity down to the limits of our measurements and well described by a Gaussian distribution with a mean fractional polarization pm = 0.028 ± 0.005 and standard deviation σpm = 0.054, truncated at p = 0. Extrapolating this model for the distribution of source polarization below the ACTPol detection threshold, we predict that one could get a clean measure of the Emode polarization power spectrum of the microwave background out to l ≈ 6000 with 1 μK-arcminute maps over 10% of the sky from a future survey. We also study the spectral energy distribution of the total and polarized source flux densities by cross-matching with low radio frequency catalogues. We do not find any correlation between the spectral indices for total flux and polarized flux.

AB - We report onmeasurements of the polarization of extragalactic sources at 148GHzmade during the first two seasons of the Atacama Cosmology Telescope Polarization (ACTPol) survey. The survey covered 680 deg2 of the sky on the celestial equator. Polarization measurements of 169 intensity-selected sources brighter than 30 mJy, that are predominantly active galactic nuclei, are presented. Above a total flux of 215 mJy where the noise bias removal in the polarization measurement is reliable, we detect 26 sources, 14 of which have a detection of linear polarization at greater than 3σ significance. The distribution of the fractional polarization as a function of total source intensity is analysed. Our result is consistent with the scenario that the fractional polarization of our measured radio source population is independent of total intensity down to the limits of our measurements and well described by a Gaussian distribution with a mean fractional polarization pm = 0.028 ± 0.005 and standard deviation σpm = 0.054, truncated at p = 0. Extrapolating this model for the distribution of source polarization below the ACTPol detection threshold, we predict that one could get a clean measure of the Emode polarization power spectrum of the microwave background out to l ≈ 6000 with 1 μK-arcminute maps over 10% of the sky from a future survey. We also study the spectral energy distribution of the total and polarized source flux densities by cross-matching with low radio frequency catalogues. We do not find any correlation between the spectral indices for total flux and polarized flux.

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