Number counts of galex sources in far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) bands

C. Kevin Xu, Jose Donas, Stephane Arnouts, Ted K. Wyder, Mark Seibert, Jorge Iglesias-Páramo, Jeremy Blaizot, Todd Small, Bruno Milliard, David Schiminovich, D. Christopher Martin, Tom A. Barlow, Luciana Blanchi, Yong Ik Byun, Karl Forster, Peter G. Friedman, Timothy M. Heckman, Patrick N. Jelinsky, Young Wook Lee, Barry F. MadoreRoger F. Malina, Patrick Morrissey, Susan G. Neff, R. Michael Rich, Oswald H.W. Siegmund, Alex S. Szalay, Barry Y. Welsh

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Abstract

Number counts of galaxies in two Galaxy Evolution Explorer (GALEX) bands [far-UV (FUV: 1530 A) and near-UV (NUV: 2310 Å); both in AB magnitudes] are reported. They provide for the first time in the literature homogeneously calibrated number counts of UV galaxies continuously covering a very wide range in UV magnitude (14-23.8). Both the FUV and NUV counts are inconsistent with a nonevolution model, whereas they are in good agreement with evolution models (essentially luminosity evolution) derived from the high-z UV luminosity functions of Arnouts et al. We find that the contribution from GAZLEX-detected galaxies to the UV background is 0.68 ± 0.10 nW m-2 sr -1 at 1530 Å and 0.99 ± 0.15 nW m-2 sr -1 at 2310 Å. These are 66% ± 9% and 44% ± 6% of the total contributions of galaxies to the UV background at 1530 Å (1.03 ± 0.15 nW m-2 sr-1) and at 2310 A (2.25 ± 0.32 nW m-2 sr-1). respectively, as estimated using the evolution models. Galaxy counts and star counts in seven regions, each containing a few square degrees of GALEX coverage in an area of ∼4-13 deg2, are compared with each other to study the region-by-region variance. This shows that for the galaxy counts, the cosmic variance is comparable to the net error due to other uncertainties. The star counts increase with decreasing absolute Galactic latitude |b|.

Original languageEnglish
Pages (from-to)L11-L14
JournalAstrophysical Journal
Volume619
Issue number1 II
DOIs
Publication statusPublished - 2005 Jan 20

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galaxies
luminosity
stars
coverings

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Xu, C. K., Donas, J., Arnouts, S., Wyder, T. K., Seibert, M., Iglesias-Páramo, J., ... Welsh, B. Y. (2005). Number counts of galex sources in far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) bands. Astrophysical Journal, 619(1 II), L11-L14. https://doi.org/10.1086/425252
Xu, C. Kevin ; Donas, Jose ; Arnouts, Stephane ; Wyder, Ted K. ; Seibert, Mark ; Iglesias-Páramo, Jorge ; Blaizot, Jeremy ; Small, Todd ; Milliard, Bruno ; Schiminovich, David ; Martin, D. Christopher ; Barlow, Tom A. ; Blanchi, Luciana ; Byun, Yong Ik ; Forster, Karl ; Friedman, Peter G. ; Heckman, Timothy M. ; Jelinsky, Patrick N. ; Lee, Young Wook ; Madore, Barry F. ; Malina, Roger F. ; Morrissey, Patrick ; Neff, Susan G. ; Rich, R. Michael ; Siegmund, Oswald H.W. ; Szalay, Alex S. ; Welsh, Barry Y. / Number counts of galex sources in far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) bands. In: Astrophysical Journal. 2005 ; Vol. 619, No. 1 II. pp. L11-L14.
@article{ca37636555994aad8430f166a5153524,
title = "Number counts of galex sources in far-ultraviolet (1530 {\AA}) and near-ultraviolet (2310 {\AA}) bands",
abstract = "Number counts of galaxies in two Galaxy Evolution Explorer (GALEX) bands [far-UV (FUV: 1530 A) and near-UV (NUV: 2310 {\AA}); both in AB magnitudes] are reported. They provide for the first time in the literature homogeneously calibrated number counts of UV galaxies continuously covering a very wide range in UV magnitude (14-23.8). Both the FUV and NUV counts are inconsistent with a nonevolution model, whereas they are in good agreement with evolution models (essentially luminosity evolution) derived from the high-z UV luminosity functions of Arnouts et al. We find that the contribution from GAZLEX-detected galaxies to the UV background is 0.68 ± 0.10 nW m-2 sr -1 at 1530 {\AA} and 0.99 ± 0.15 nW m-2 sr -1 at 2310 {\AA}. These are 66{\%} ± 9{\%} and 44{\%} ± 6{\%} of the total contributions of galaxies to the UV background at 1530 {\AA} (1.03 ± 0.15 nW m-2 sr-1) and at 2310 A (2.25 ± 0.32 nW m-2 sr-1). respectively, as estimated using the evolution models. Galaxy counts and star counts in seven regions, each containing a few square degrees of GALEX coverage in an area of ∼4-13 deg2, are compared with each other to study the region-by-region variance. This shows that for the galaxy counts, the cosmic variance is comparable to the net error due to other uncertainties. The star counts increase with decreasing absolute Galactic latitude |b|.",
author = "Xu, {C. Kevin} and Jose Donas and Stephane Arnouts and Wyder, {Ted K.} and Mark Seibert and Jorge Iglesias-P{\'a}ramo and Jeremy Blaizot and Todd Small and Bruno Milliard and David Schiminovich and Martin, {D. Christopher} and Barlow, {Tom A.} and Luciana Blanchi and Byun, {Yong Ik} and Karl Forster and Friedman, {Peter G.} and Heckman, {Timothy M.} and Jelinsky, {Patrick N.} and Lee, {Young Wook} and Madore, {Barry F.} and Malina, {Roger F.} and Patrick Morrissey and Neff, {Susan G.} and Rich, {R. Michael} and Siegmund, {Oswald H.W.} and Szalay, {Alex S.} and Welsh, {Barry Y.}",
year = "2005",
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Xu, CK, Donas, J, Arnouts, S, Wyder, TK, Seibert, M, Iglesias-Páramo, J, Blaizot, J, Small, T, Milliard, B, Schiminovich, D, Martin, DC, Barlow, TA, Blanchi, L, Byun, YI, Forster, K, Friedman, PG, Heckman, TM, Jelinsky, PN, Lee, YW, Madore, BF, Malina, RF, Morrissey, P, Neff, SG, Rich, RM, Siegmund, OHW, Szalay, AS & Welsh, BY 2005, 'Number counts of galex sources in far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) bands', Astrophysical Journal, vol. 619, no. 1 II, pp. L11-L14. https://doi.org/10.1086/425252

Number counts of galex sources in far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) bands. / Xu, C. Kevin; Donas, Jose; Arnouts, Stephane; Wyder, Ted K.; Seibert, Mark; Iglesias-Páramo, Jorge; Blaizot, Jeremy; Small, Todd; Milliard, Bruno; Schiminovich, David; Martin, D. Christopher; Barlow, Tom A.; Blanchi, Luciana; Byun, Yong Ik; Forster, Karl; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick N.; Lee, Young Wook; Madore, Barry F.; Malina, Roger F.; Morrissey, Patrick; Neff, Susan G.; Rich, R. Michael; Siegmund, Oswald H.W.; Szalay, Alex S.; Welsh, Barry Y.

In: Astrophysical Journal, Vol. 619, No. 1 II, 20.01.2005, p. L11-L14.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Number counts of galex sources in far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) bands

AU - Xu, C. Kevin

AU - Donas, Jose

AU - Arnouts, Stephane

AU - Wyder, Ted K.

AU - Seibert, Mark

AU - Iglesias-Páramo, Jorge

AU - Blaizot, Jeremy

AU - Small, Todd

AU - Milliard, Bruno

AU - Schiminovich, David

AU - Martin, D. Christopher

AU - Barlow, Tom A.

AU - Blanchi, Luciana

AU - Byun, Yong Ik

AU - Forster, Karl

AU - Friedman, Peter G.

AU - Heckman, Timothy M.

AU - Jelinsky, Patrick N.

AU - Lee, Young Wook

AU - Madore, Barry F.

AU - Malina, Roger F.

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Rich, R. Michael

AU - Siegmund, Oswald H.W.

AU - Szalay, Alex S.

AU - Welsh, Barry Y.

PY - 2005/1/20

Y1 - 2005/1/20

N2 - Number counts of galaxies in two Galaxy Evolution Explorer (GALEX) bands [far-UV (FUV: 1530 A) and near-UV (NUV: 2310 Å); both in AB magnitudes] are reported. They provide for the first time in the literature homogeneously calibrated number counts of UV galaxies continuously covering a very wide range in UV magnitude (14-23.8). Both the FUV and NUV counts are inconsistent with a nonevolution model, whereas they are in good agreement with evolution models (essentially luminosity evolution) derived from the high-z UV luminosity functions of Arnouts et al. We find that the contribution from GAZLEX-detected galaxies to the UV background is 0.68 ± 0.10 nW m-2 sr -1 at 1530 Å and 0.99 ± 0.15 nW m-2 sr -1 at 2310 Å. These are 66% ± 9% and 44% ± 6% of the total contributions of galaxies to the UV background at 1530 Å (1.03 ± 0.15 nW m-2 sr-1) and at 2310 A (2.25 ± 0.32 nW m-2 sr-1). respectively, as estimated using the evolution models. Galaxy counts and star counts in seven regions, each containing a few square degrees of GALEX coverage in an area of ∼4-13 deg2, are compared with each other to study the region-by-region variance. This shows that for the galaxy counts, the cosmic variance is comparable to the net error due to other uncertainties. The star counts increase with decreasing absolute Galactic latitude |b|.

AB - Number counts of galaxies in two Galaxy Evolution Explorer (GALEX) bands [far-UV (FUV: 1530 A) and near-UV (NUV: 2310 Å); both in AB magnitudes] are reported. They provide for the first time in the literature homogeneously calibrated number counts of UV galaxies continuously covering a very wide range in UV magnitude (14-23.8). Both the FUV and NUV counts are inconsistent with a nonevolution model, whereas they are in good agreement with evolution models (essentially luminosity evolution) derived from the high-z UV luminosity functions of Arnouts et al. We find that the contribution from GAZLEX-detected galaxies to the UV background is 0.68 ± 0.10 nW m-2 sr -1 at 1530 Å and 0.99 ± 0.15 nW m-2 sr -1 at 2310 Å. These are 66% ± 9% and 44% ± 6% of the total contributions of galaxies to the UV background at 1530 Å (1.03 ± 0.15 nW m-2 sr-1) and at 2310 A (2.25 ± 0.32 nW m-2 sr-1). respectively, as estimated using the evolution models. Galaxy counts and star counts in seven regions, each containing a few square degrees of GALEX coverage in an area of ∼4-13 deg2, are compared with each other to study the region-by-region variance. This shows that for the galaxy counts, the cosmic variance is comparable to the net error due to other uncertainties. The star counts increase with decreasing absolute Galactic latitude |b|.

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Xu CK, Donas J, Arnouts S, Wyder TK, Seibert M, Iglesias-Páramo J et al. Number counts of galex sources in far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) bands. Astrophysical Journal. 2005 Jan 20;619(1 II):L11-L14. https://doi.org/10.1086/425252