A fluctuation analysis of the Bolocam 1.1 mm Lockman Hole Survey

Philip R. MaLoney, Jason Glenn, James E. Aguirre, Sunil R. Golwala, G. T. Laurent, P. A R Ade, J. J. Bock, S. F. Edgington, A. Goldin, D. Haig, A. E. Lange, Philip Mauskopf, H. Nguyen, P. Rossinot, J. Sayers, P. Stover

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We perform a fluctuation analysis of the 1.1 mm Bolocam Lockman Hole Survey, which covers 324 arcmin2 to a very uniform point-source-filtered rms noise level of σ ≃ 1.4 mJy beam -1. The fluctuation analysis has the significant advantage of using all of the available data, since no extraction of sources is performed: direct comparison is made between the observed pixel flux density distribution [P(D)] and the theoretical distributions for a broad range of power-law number count models, n(S) = n0S. We constrain the number counts in the 1-10 mJy range and derive significantly tighter constraints than in previous work: the power-law index δ = 2.7-0.15 +0.18, while the amplitude is n0 = 1595 -238 +85 mJy-1 deg-2, or N(> 1 mJy) = 940-140 +50 deg-2 (95% confidence). At flux densities above 4 mJy, where a valid comparison can be made, our results agree extremely well with those derived from the extracted source number counts by Laurent et al.: the best-fitting differential slope is somewhat shallower (δ = 2.7 vs. 3.2), but well within the 68% confidence limit, and the amplitudes (number of sources per square degree) agree to 10%. At 1 mJy, however [the limit of the P(D) analysis], the shallower slope derived here implies a substantially smaller amplitude for the integral number counts than extrapolation from above 4 mJy would predict. Our derived normalization is about 2.5 times smaller than that determined by the Max-Planck Millimeter Bolometer (MAMBO) at 1.2 mm (Greve et al.). However, the uncertainty in the normalization for both data sets is dominated by the systematic (i.e., absolute flux calibration) rather than statistical errors; within these uncertainties, our results are in agreement. Our best-fit amplitude at 1 mJy is also about a factor of 3 below the prediction of Blain et al., but we are in agreement above a few millijanskys. We estimate that about 7% of the 1.1 mm background has been resolved at 1 mJy.

Original languageEnglish (US)
Pages (from-to)1044-1052
Number of pages9
JournalAstrophysical Journal
Volume635
Issue number2 I
DOIs
StatePublished - Dec 20 2005
Externally publishedYes

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power law
flux density
slopes
confidence limits
bolometers
point sources
point source
density distribution
extrapolation
confidence
pixel
pixels
calibration
analysis
estimates
prediction
predictions
normalisation
comparison
distribution

Keywords

  • Galaxies: high-redshift
  • Galaxies: starburst
  • Submillimeter

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

MaLoney, P. R., Glenn, J., Aguirre, J. E., Golwala, S. R., Laurent, G. T., Ade, P. A. R., ... Stover, P. (2005). A fluctuation analysis of the Bolocam 1.1 mm Lockman Hole Survey. Astrophysical Journal, 635(2 I), 1044-1052. https://doi.org/10.1086/497585

A fluctuation analysis of the Bolocam 1.1 mm Lockman Hole Survey. / MaLoney, Philip R.; Glenn, Jason; Aguirre, James E.; Golwala, Sunil R.; Laurent, G. T.; Ade, P. A R; Bock, J. J.; Edgington, S. F.; Goldin, A.; Haig, D.; Lange, A. E.; Mauskopf, Philip; Nguyen, H.; Rossinot, P.; Sayers, J.; Stover, P.

In: Astrophysical Journal, Vol. 635, No. 2 I, 20.12.2005, p. 1044-1052.

Research output: Contribution to journalArticle

MaLoney, PR, Glenn, J, Aguirre, JE, Golwala, SR, Laurent, GT, Ade, PAR, Bock, JJ, Edgington, SF, Goldin, A, Haig, D, Lange, AE, Mauskopf, P, Nguyen, H, Rossinot, P, Sayers, J & Stover, P 2005, 'A fluctuation analysis of the Bolocam 1.1 mm Lockman Hole Survey', Astrophysical Journal, vol. 635, no. 2 I, pp. 1044-1052. https://doi.org/10.1086/497585
MaLoney PR, Glenn J, Aguirre JE, Golwala SR, Laurent GT, Ade PAR et al. A fluctuation analysis of the Bolocam 1.1 mm Lockman Hole Survey. Astrophysical Journal. 2005 Dec 20;635(2 I):1044-1052. https://doi.org/10.1086/497585
MaLoney, Philip R. ; Glenn, Jason ; Aguirre, James E. ; Golwala, Sunil R. ; Laurent, G. T. ; Ade, P. A R ; Bock, J. J. ; Edgington, S. F. ; Goldin, A. ; Haig, D. ; Lange, A. E. ; Mauskopf, Philip ; Nguyen, H. ; Rossinot, P. ; Sayers, J. ; Stover, P. / A fluctuation analysis of the Bolocam 1.1 mm Lockman Hole Survey. In: Astrophysical Journal. 2005 ; Vol. 635, No. 2 I. pp. 1044-1052.
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AU - MaLoney, Philip R.

AU - Glenn, Jason

AU - Aguirre, James E.

AU - Golwala, Sunil R.

AU - Laurent, G. T.

AU - Ade, P. A R

AU - Bock, J. J.

AU - Edgington, S. F.

AU - Goldin, A.

AU - Haig, D.

AU - Lange, A. E.

AU - Mauskopf, Philip

AU - Nguyen, H.

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AU - Sayers, J.

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N2 - We perform a fluctuation analysis of the 1.1 mm Bolocam Lockman Hole Survey, which covers 324 arcmin2 to a very uniform point-source-filtered rms noise level of σ ≃ 1.4 mJy beam -1. The fluctuation analysis has the significant advantage of using all of the available data, since no extraction of sources is performed: direct comparison is made between the observed pixel flux density distribution [P(D)] and the theoretical distributions for a broad range of power-law number count models, n(S) = n0S-δ. We constrain the number counts in the 1-10 mJy range and derive significantly tighter constraints than in previous work: the power-law index δ = 2.7-0.15 +0.18, while the amplitude is n0 = 1595 -238 +85 mJy-1 deg-2, or N(> 1 mJy) = 940-140 +50 deg-2 (95% confidence). At flux densities above 4 mJy, where a valid comparison can be made, our results agree extremely well with those derived from the extracted source number counts by Laurent et al.: the best-fitting differential slope is somewhat shallower (δ = 2.7 vs. 3.2), but well within the 68% confidence limit, and the amplitudes (number of sources per square degree) agree to 10%. At 1 mJy, however [the limit of the P(D) analysis], the shallower slope derived here implies a substantially smaller amplitude for the integral number counts than extrapolation from above 4 mJy would predict. Our derived normalization is about 2.5 times smaller than that determined by the Max-Planck Millimeter Bolometer (MAMBO) at 1.2 mm (Greve et al.). However, the uncertainty in the normalization for both data sets is dominated by the systematic (i.e., absolute flux calibration) rather than statistical errors; within these uncertainties, our results are in agreement. Our best-fit amplitude at 1 mJy is also about a factor of 3 below the prediction of Blain et al., but we are in agreement above a few millijanskys. We estimate that about 7% of the 1.1 mm background has been resolved at 1 mJy.

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KW - Galaxies: high-redshift

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