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B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data
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| Zeitschriftentitel: | Monthly Notices of the Royal Astronomical Society: Letters |
|---|---|
| Personen und Körperschaften: | , , |
| In: | Monthly Notices of the Royal Astronomical Society: Letters, 373, 2006, 1, S. L93-L97 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Oxford University Press (OUP)
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| Schlagwörter: |
| author_facet |
Carretti, E. Bernardi, G. Cortiglioni, S. Carretti, E. Bernardi, G. Cortiglioni, S. |
|---|---|
| author |
Carretti, E. Bernardi, G. Cortiglioni, S. |
| spellingShingle |
Carretti, E. Bernardi, G. Cortiglioni, S. Monthly Notices of the Royal Astronomical Society: Letters B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data Space and Planetary Science Astronomy and Astrophysics |
| author_sort |
carretti, e. |
| spelling |
Carretti, E. Bernardi, G. Cortiglioni, S. 1745-3933 1745-3925 Oxford University Press (OUP) Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1111/j.1745-3933.2006.00250.x <jats:title>Abstract</jats:title> <jats:p>We study the contamination of the B-mode of the cosmic microwave background polarization (CMBP) by Galactic synchrotron in the lowest emission regions of the sky. The 22.8-GHz polarization map of the 3-yr Wilkinson Microwave Anisotropy Probe (WMAP) data release is used to identify and analyse such regions. Two areas are selected with signal-to-noise ratio S/N &lt; 2 and S/N &lt; 3, covering ∼16 and ∼26 per cent fraction of the sky, respectively. The polarization power spectra of these two areas are dominated by the sky signal on large angular scales (multipoles ℓ &lt; 15), while the noise prevails on degree scales. Angular extrapolations show that the synchrotron emission competes with the CMBP B-mode signal for tensor-to-scalar perturbation power ratio T/S= 10−3–10−2 at 70 GHz in the 16 per cent lowest emission sky (S/N &lt; 2 area). These values worsen by a factor ∼5 in the S/N &lt; 3 region. The novelty is that our estimates regard the whole lowest emission regions and outline a contamination better than that of the whole high Galactic latitude sky found by the WMAP team (T/S &gt; 0.3). Such regions allow T/S∼ 10−3 to be measured directly which approximately corresponds to the limit imposed by using a sky coverage of 15 per cent. This opens interesting perspectives on the investigation of the inflationary model space in lowest emission regions.</jats:p> <i>B</i>-mode contamination by synchrotron emission from 3-yr <i>Wilkinson Microwave Anisotropy Probe</i> data Monthly Notices of the Royal Astronomical Society: Letters |
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Oxford University Press (OUP), 2006 |
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Oxford University Press (OUP), 2006 |
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1745-3933 1745-3925 |
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Monthly Notices of the Royal Astronomical Society: Letters |
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| title |
B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_unstemmed |
B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_full |
B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_fullStr |
B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_full_unstemmed |
B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_short |
B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_sort |
<i>b</i>-mode contamination by synchrotron emission from 3-yr <i>wilkinson microwave anisotropy probe</i> data |
| topic |
Space and Planetary Science Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.1111/j.1745-3933.2006.00250.x |
| publishDate |
2006 |
| physical |
L93-L97 |
| description |
<jats:title>Abstract</jats:title>
<jats:p>We study the contamination of the B-mode of the cosmic microwave background polarization (CMBP) by Galactic synchrotron in the lowest emission regions of the sky. The 22.8-GHz polarization map of the 3-yr Wilkinson Microwave Anisotropy Probe (WMAP) data release is used to identify and analyse such regions. Two areas are selected with signal-to-noise ratio S/N &lt; 2 and S/N &lt; 3, covering ∼16 and ∼26 per cent fraction of the sky, respectively. The polarization power spectra of these two areas are dominated by the sky signal on large angular scales (multipoles ℓ &lt; 15), while the noise prevails on degree scales. Angular extrapolations show that the synchrotron emission competes with the CMBP B-mode signal for tensor-to-scalar perturbation power ratio T/S= 10−3–10−2 at 70 GHz in the 16 per cent lowest emission sky (S/N &lt; 2 area). These values worsen by a factor ∼5 in the S/N &lt; 3 region. The novelty is that our estimates regard the whole lowest emission regions and outline a contamination better than that of the whole high Galactic latitude sky found by the WMAP team (T/S &gt; 0.3). Such regions allow T/S∼ 10−3 to be measured directly which approximately corresponds to the limit imposed by using a sky coverage of 15 per cent. This opens interesting perspectives on the investigation of the inflationary model space in lowest emission regions.</jats:p> |
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| author | Carretti, E., Bernardi, G., Cortiglioni, S. |
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| description | <jats:title>Abstract</jats:title> <jats:p>We study the contamination of the B-mode of the cosmic microwave background polarization (CMBP) by Galactic synchrotron in the lowest emission regions of the sky. The 22.8-GHz polarization map of the 3-yr Wilkinson Microwave Anisotropy Probe (WMAP) data release is used to identify and analyse such regions. Two areas are selected with signal-to-noise ratio S/N &lt; 2 and S/N &lt; 3, covering ∼16 and ∼26 per cent fraction of the sky, respectively. The polarization power spectra of these two areas are dominated by the sky signal on large angular scales (multipoles ℓ &lt; 15), while the noise prevails on degree scales. Angular extrapolations show that the synchrotron emission competes with the CMBP B-mode signal for tensor-to-scalar perturbation power ratio T/S= 10−3–10−2 at 70 GHz in the 16 per cent lowest emission sky (S/N &lt; 2 area). These values worsen by a factor ∼5 in the S/N &lt; 3 region. The novelty is that our estimates regard the whole lowest emission regions and outline a contamination better than that of the whole high Galactic latitude sky found by the WMAP team (T/S &gt; 0.3). Such regions allow T/S∼ 10−3 to be measured directly which approximately corresponds to the limit imposed by using a sky coverage of 15 per cent. This opens interesting perspectives on the investigation of the inflationary model space in lowest emission regions.</jats:p> |
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| imprint | Oxford University Press (OUP), 2006 |
| imprint_str_mv | Oxford University Press (OUP), 2006 |
| institution | DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Rs1, DE-Pl11, DE-105, DE-14, DE-Ch1, DE-L229 |
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| spelling | Carretti, E. Bernardi, G. Cortiglioni, S. 1745-3933 1745-3925 Oxford University Press (OUP) Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1111/j.1745-3933.2006.00250.x <jats:title>Abstract</jats:title> <jats:p>We study the contamination of the B-mode of the cosmic microwave background polarization (CMBP) by Galactic synchrotron in the lowest emission regions of the sky. The 22.8-GHz polarization map of the 3-yr Wilkinson Microwave Anisotropy Probe (WMAP) data release is used to identify and analyse such regions. Two areas are selected with signal-to-noise ratio S/N &lt; 2 and S/N &lt; 3, covering ∼16 and ∼26 per cent fraction of the sky, respectively. The polarization power spectra of these two areas are dominated by the sky signal on large angular scales (multipoles ℓ &lt; 15), while the noise prevails on degree scales. Angular extrapolations show that the synchrotron emission competes with the CMBP B-mode signal for tensor-to-scalar perturbation power ratio T/S= 10−3–10−2 at 70 GHz in the 16 per cent lowest emission sky (S/N &lt; 2 area). These values worsen by a factor ∼5 in the S/N &lt; 3 region. The novelty is that our estimates regard the whole lowest emission regions and outline a contamination better than that of the whole high Galactic latitude sky found by the WMAP team (T/S &gt; 0.3). Such regions allow T/S∼ 10−3 to be measured directly which approximately corresponds to the limit imposed by using a sky coverage of 15 per cent. This opens interesting perspectives on the investigation of the inflationary model space in lowest emission regions.</jats:p> <i>B</i>-mode contamination by synchrotron emission from 3-yr <i>Wilkinson Microwave Anisotropy Probe</i> data Monthly Notices of the Royal Astronomical Society: Letters |
| spellingShingle | Carretti, E., Bernardi, G., Cortiglioni, S., Monthly Notices of the Royal Astronomical Society: Letters, B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data, Space and Planetary Science, Astronomy and Astrophysics |
| title | B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_full | B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_fullStr | B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_full_unstemmed | B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_short | B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| title_sort | <i>b</i>-mode contamination by synchrotron emission from 3-yr <i>wilkinson microwave anisotropy probe</i> data |
| title_unstemmed | B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data |
| topic | Space and Planetary Science, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.1111/j.1745-3933.2006.00250.x |