Galaxy And Mass Assembly (GAMA): colour- and luminosity-dependent clustering from calibrated photometric redshifts

L. Christodoulou; C. Eminian; J. Loveday; P. Norberg; I. K. Baldry; P. D. Hurley; S. P. Driver; S. P. Bamford; A. M. Hopkins; J. Liske; J. A. Peacock; J. Bland-Hawthorn; S. Brough; E. Cameron; C. J. Conselice; S. M. Croom; C. S. Frenk; M. Gunawardhana; D. H. Jones; L. S. Kelvin; K. Kuijken; R. C. Nichol; H. Parkinson; K. A. Pimbblet; C. C. Popescu; M. Prescott; A. S. G. Robotham; R. G. Sharp; W. J. Sutherland; E. N. Taylor; D. Thomas; R. J. Tuffs; E. van Kampen; D. Wijesinghe

doi:10.1111/j.1365-2966.2012.21434.x

Galaxy And Mass Assembly (GAMA): colour- and luminosity-dependent clustering from calibrated photometric redshifts

L. Christodoulou, C. Eminian, J. Loveday, P. Norberg, I. K. Baldry, P. D. Hurley, S. P. Driver, S. P. Bamford, A. M. Hopkins, J. Liske, J. A. Peacock, J. Bland-Hawthorn, S. Brough, E. Cameron, C. J. Conselice, S. M. Croom, C. S. Frenk, M. Gunawardhana, D. H. Jones, L. S. KelvinK. Kuijken, R. C. Nichol, H. Parkinson, K. A. Pimbblet, C. C. Popescu, M. Prescott, A. S. G. Robotham, R. G. Sharp, W. J. Sutherland, E. N. Taylor, D. Thomas, R. J. Tuffs, E. van Kampen, D. Wijesinghe

Research output: Contribution to journal › Article › peer-review

Abstract

We measure the two-point angular correlation function of a sample of 4289 223 galaxies with r <19.4 mag from the Sloan Digital Sky Survey (SDSS) as a function of photometric redshift, absolute magnitude and colour down to Mr - 5 log h = -14 mag. Photometric redshifts are estimated from ugriz model magnitudes and two Petrosian radii using the artificial neural network package ANNz, taking advantage of the Galaxy And Mass Assembly (GAMA) spectroscopic sample as our training set. These photometric redshifts are then used to determine absolute magnitudes and colours. For all our samples, we estimate the underlying redshift and absolute magnitude distributions using Monte Carlo resampling. These redshift distributions are used in Limber's equation to obtain spatial correlation function parameters from power-law fits to the angular correlation function. We confirm an increase in clustering strength for sub-L* red galaxies compared with ˜L* red galaxies at small scales in all redshift bins, whereas for the blue population the correlation length is almost independent of luminosity for ˜L* galaxies and fainter. A linear relation between relative bias and log luminosity is found to hold down to luminosities L ˜ 0.03L*. We find that the redshift dependence of the bias of the L* population can be described by the passive evolution model of Tegmark & Peebles. A visual inspection of a random sample from our r <19.4 sample of SDSS galaxies reveals that about 10 per cent are spurious, with a higher contamination rate towards very faint absolute magnitudes due to over-deblended nearby galaxies. We correct for this contamination in our clustering analysis.

Original language	English
Pages (from-to)	1527-1548
Number of pages	22
Journal	Monthly Notices of the Royal Astronomical Society
Volume	425
Issue number	2
DOIs	https://doi.org/10.1111/j.1365-2966.2012.21434.x
Publication status	Published - 11 Sep 2012

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10.1111/j.1365-2966.2012.21434.x

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Christodoulou, L., Eminian, C., Loveday, J., Norberg, P., Baldry, I. K., Hurley, P. D., Driver, S. P., Bamford, S. P., Hopkins, A. M., Liske, J., Peacock, J. A., Bland-Hawthorn, J., Brough, S., Cameron, E., Conselice, C. J., Croom, S. M., Frenk, C. S., Gunawardhana, M., Jones, D. H., ... Wijesinghe, D. (2012). Galaxy And Mass Assembly (GAMA): colour- and luminosity-dependent clustering from calibrated photometric redshifts. Monthly Notices of the Royal Astronomical Society, 425(2), 1527-1548. https://doi.org/10.1111/j.1365-2966.2012.21434.x

Christodoulou, L. ; Eminian, C. ; Loveday, J. ; Norberg, P. ; Baldry, I. K. ; Hurley, P. D. ; Driver, S. P. ; Bamford, S. P. ; Hopkins, A. M. ; Liske, J. ; Peacock, J. A. ; Bland-Hawthorn, J. ; Brough, S. ; Cameron, E. ; Conselice, C. J. ; Croom, S. M. ; Frenk, C. S. ; Gunawardhana, M. ; Jones, D. H. ; Kelvin, L. S. ; Kuijken, K. ; Nichol, R. C. ; Parkinson, H. ; Pimbblet, K. A. ; Popescu, C. C. ; Prescott, M. ; Robotham, A. S. G. ; Sharp, R. G. ; Sutherland, W. J. ; Taylor, E. N. ; Thomas, D. ; Tuffs, R. J. ; van Kampen, E. ; Wijesinghe, D. / Galaxy And Mass Assembly (GAMA) : colour- and luminosity-dependent clustering from calibrated photometric redshifts. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 425, No. 2. pp. 1527-1548.

@article{02671fe2ee874515bc6b9c29e973de29,

title = "Galaxy And Mass Assembly (GAMA): colour- and luminosity-dependent clustering from calibrated photometric redshifts",

abstract = "We measure the two-point angular correlation function of a sample of 4289 223 galaxies with r <19.4 mag from the Sloan Digital Sky Survey (SDSS) as a function of photometric redshift, absolute magnitude and colour down to Mr - 5 log h = -14 mag. Photometric redshifts are estimated from ugriz model magnitudes and two Petrosian radii using the artificial neural network package ANNz, taking advantage of the Galaxy And Mass Assembly (GAMA) spectroscopic sample as our training set. These photometric redshifts are then used to determine absolute magnitudes and colours. For all our samples, we estimate the underlying redshift and absolute magnitude distributions using Monte Carlo resampling. These redshift distributions are used in Limber's equation to obtain spatial correlation function parameters from power-law fits to the angular correlation function. We confirm an increase in clustering strength for sub-L* red galaxies compared with ˜L* red galaxies at small scales in all redshift bins, whereas for the blue population the correlation length is almost independent of luminosity for ˜L* galaxies and fainter. A linear relation between relative bias and log luminosity is found to hold down to luminosities L ˜ 0.03L*. We find that the redshift dependence of the bias of the L* population can be described by the passive evolution model of Tegmark & Peebles. A visual inspection of a random sample from our r <19.4 sample of SDSS galaxies reveals that about 10 per cent are spurious, with a higher contamination rate towards very faint absolute magnitudes due to over-deblended nearby galaxies. We correct for this contamination in our clustering analysis.",

author = "L. Christodoulou and C. Eminian and J. Loveday and P. Norberg and Baldry, {I. K.} and Hurley, {P. D.} and Driver, {S. P.} and Bamford, {S. P.} and Hopkins, {A. M.} and J. Liske and Peacock, {J. A.} and J. Bland-Hawthorn and S. Brough and E. Cameron and Conselice, {C. J.} and Croom, {S. M.} and Frenk, {C. S.} and M. Gunawardhana and Jones, {D. H.} and Kelvin, {L. S.} and K. Kuijken and Nichol, {R. C.} and H. Parkinson and Pimbblet, {K. A.} and Popescu, {C. C.} and M. Prescott and Robotham, {A. S. G.} and Sharp, {R. G.} and Sutherland, {W. J.} and Taylor, {E. N.} and D. Thomas and Tuffs, {R. J.} and {van Kampen}, E. and D. Wijesinghe",

year = "2012",

month = sep,

day = "11",

doi = "10.1111/j.1365-2966.2012.21434.x",

language = "English",

volume = "425",

pages = "1527--1548",

journal = "Monthly Notices of the Royal Astronomical Society ",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Christodoulou, L, Eminian, C, Loveday, J, Norberg, P, Baldry, IK, Hurley, PD, Driver, SP, Bamford, SP, Hopkins, AM, Liske, J, Peacock, JA, Bland-Hawthorn, J, Brough, S, Cameron, E, Conselice, CJ, Croom, SM, Frenk, CS, Gunawardhana, M, Jones, DH, Kelvin, LS, Kuijken, K, Nichol, RC, Parkinson, H, Pimbblet, KA, Popescu, CC, Prescott, M, Robotham, ASG, Sharp, RG, Sutherland, WJ, Taylor, EN, Thomas, D, Tuffs, RJ, van Kampen, E & Wijesinghe, D 2012, 'Galaxy And Mass Assembly (GAMA): colour- and luminosity-dependent clustering from calibrated photometric redshifts', Monthly Notices of the Royal Astronomical Society, vol. 425, no. 2, pp. 1527-1548. https://doi.org/10.1111/j.1365-2966.2012.21434.x

Galaxy And Mass Assembly (GAMA) : colour- and luminosity-dependent clustering from calibrated photometric redshifts. / Christodoulou, L.; Eminian, C.; Loveday, J.; Norberg, P.; Baldry, I. K.; Hurley, P. D.; Driver, S. P.; Bamford, S. P.; Hopkins, A. M.; Liske, J.; Peacock, J. A.; Bland-Hawthorn, J.; Brough, S.; Cameron, E.; Conselice, C. J.; Croom, S. M.; Frenk, C. S.; Gunawardhana, M.; Jones, D. H.; Kelvin, L. S.; Kuijken, K.; Nichol, R. C.; Parkinson, H.; Pimbblet, K. A.; Popescu, C. C.; Prescott, M.; Robotham, A. S. G.; Sharp, R. G.; Sutherland, W. J.; Taylor, E. N.; Thomas, D.; Tuffs, R. J.; van Kampen, E.; Wijesinghe, D.

In: Monthly Notices of the Royal Astronomical Society, Vol. 425, No. 2, 11.09.2012, p. 1527-1548.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Galaxy And Mass Assembly (GAMA)

T2 - colour- and luminosity-dependent clustering from calibrated photometric redshifts

AU - Christodoulou, L.

AU - Eminian, C.

AU - Loveday, J.

AU - Norberg, P.

AU - Baldry, I. K.

AU - Hurley, P. D.

AU - Driver, S. P.

AU - Bamford, S. P.

AU - Hopkins, A. M.

AU - Liske, J.

AU - Peacock, J. A.

AU - Bland-Hawthorn, J.

AU - Brough, S.

AU - Cameron, E.

AU - Conselice, C. J.

AU - Croom, S. M.

AU - Frenk, C. S.

AU - Gunawardhana, M.

AU - Jones, D. H.

AU - Kelvin, L. S.

AU - Kuijken, K.

AU - Nichol, R. C.

AU - Parkinson, H.

AU - Pimbblet, K. A.

AU - Popescu, C. C.

AU - Prescott, M.

AU - Robotham, A. S. G.

AU - Sharp, R. G.

AU - Sutherland, W. J.

AU - Taylor, E. N.

AU - Thomas, D.

AU - Tuffs, R. J.

AU - van Kampen, E.

AU - Wijesinghe, D.

PY - 2012/9/11

Y1 - 2012/9/11

N2 - We measure the two-point angular correlation function of a sample of 4289 223 galaxies with r <19.4 mag from the Sloan Digital Sky Survey (SDSS) as a function of photometric redshift, absolute magnitude and colour down to Mr - 5 log h = -14 mag. Photometric redshifts are estimated from ugriz model magnitudes and two Petrosian radii using the artificial neural network package ANNz, taking advantage of the Galaxy And Mass Assembly (GAMA) spectroscopic sample as our training set. These photometric redshifts are then used to determine absolute magnitudes and colours. For all our samples, we estimate the underlying redshift and absolute magnitude distributions using Monte Carlo resampling. These redshift distributions are used in Limber's equation to obtain spatial correlation function parameters from power-law fits to the angular correlation function. We confirm an increase in clustering strength for sub-L* red galaxies compared with ˜L* red galaxies at small scales in all redshift bins, whereas for the blue population the correlation length is almost independent of luminosity for ˜L* galaxies and fainter. A linear relation between relative bias and log luminosity is found to hold down to luminosities L ˜ 0.03L*. We find that the redshift dependence of the bias of the L* population can be described by the passive evolution model of Tegmark & Peebles. A visual inspection of a random sample from our r <19.4 sample of SDSS galaxies reveals that about 10 per cent are spurious, with a higher contamination rate towards very faint absolute magnitudes due to over-deblended nearby galaxies. We correct for this contamination in our clustering analysis.

AB - We measure the two-point angular correlation function of a sample of 4289 223 galaxies with r <19.4 mag from the Sloan Digital Sky Survey (SDSS) as a function of photometric redshift, absolute magnitude and colour down to Mr - 5 log h = -14 mag. Photometric redshifts are estimated from ugriz model magnitudes and two Petrosian radii using the artificial neural network package ANNz, taking advantage of the Galaxy And Mass Assembly (GAMA) spectroscopic sample as our training set. These photometric redshifts are then used to determine absolute magnitudes and colours. For all our samples, we estimate the underlying redshift and absolute magnitude distributions using Monte Carlo resampling. These redshift distributions are used in Limber's equation to obtain spatial correlation function parameters from power-law fits to the angular correlation function. We confirm an increase in clustering strength for sub-L* red galaxies compared with ˜L* red galaxies at small scales in all redshift bins, whereas for the blue population the correlation length is almost independent of luminosity for ˜L* galaxies and fainter. A linear relation between relative bias and log luminosity is found to hold down to luminosities L ˜ 0.03L*. We find that the redshift dependence of the bias of the L* population can be described by the passive evolution model of Tegmark & Peebles. A visual inspection of a random sample from our r <19.4 sample of SDSS galaxies reveals that about 10 per cent are spurious, with a higher contamination rate towards very faint absolute magnitudes due to over-deblended nearby galaxies. We correct for this contamination in our clustering analysis.

U2 - 10.1111/j.1365-2966.2012.21434.x

DO - 10.1111/j.1365-2966.2012.21434.x

M3 - Article

VL - 425

SP - 1527

EP - 1548

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -

Galaxy And Mass Assembly (GAMA): colour- and luminosity-dependent clustering from calibrated photometric redshifts

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