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Your search keyword '"Jackson, Carole A."' showing total 20 results
Start Over Author "Jackson, Carole A." Publisher blackwell publishing ltd
20 results on '"Jackson, Carole A."'

1. Discovery of HI gas in a young radio galaxy at z = 0.44 using the Australian square kilometre array pathfinder

Author

Allison, J.R., Sadler, Elaine M, Moss, V.A., Whiting, M.T., Hunstead, Richard, Curran, S.J., Croom, Scott M, Glowacki, M., Morganti, Raffaella, Tzioumis, A K, Storey, M., Sweetnam, T., Troup, E., Turner, B., Tuthill, J., Voronkov, M.A., Westmeier, T., Wilson, C.D., Zwaan, M A, Pracy, Michael, Shabala, Stanislav S, Zwaan, M.A., Allen, G, Amy, S.W., Axtens, P., Ball, Lewis, Bannister, Keith, Barker, S., Bell, M., Bock, D. C.-J., Bolton, R., Bowen, M., Boyle, B., Braun, R., Broadhurst, S., Brodrick, D., Brothers, M., Brown, A., Bunton, John D., Cantrall, C., Chapman, J., Cheng, W., Chippendale, A.P., Chung, Y., Cooray, F., Cornwell, T., DeBoer, D., Diamond, P., Edwards, P G, Ekers, Ronald D, Feain, I, Ferris, Richard H, Forsyth, R., Gough, R, Grancea, A., Gupta, N., Guzman, J.C., Hampson, G., Harvey-Smith, L., Haskins, C., Hay, S., Hayman, D.B., Heywood, I., Hotan, A.W., Hoyle, S., Humphreys, B., Indermuehle, B.T., Jacka, C., Jackson, Carole A, Jackson, S., Jeganathan, K., Johnston, S, Joseph, J., Kendall, R., Kesteven, M J, Kiraly, D., Koribalski, Baerbel S, Leach, M., Lenc, Emil, Lensson, E., Mackay, S., Macleod, A., Marquarding, M, Marvil, J., McClure-Griffiths, Naomi, McConnell, D, Mirtschin, P., Norris, R P, Neuhold, S., Ng, A., O’Sullivan, J., Pathikulangara, Joseph, Pearce, S., Phillips, C, Popping, A., Qiao, R.Y., Reynolds, J E, Roberts, P., Sault, Robert J, Schinckel, A., Serra, P., Shaw, R., Shields, M., Shimwell, Timothy W, Allison, J.R., Sadler, Elaine M, Moss, V.A., Whiting, M.T., Hunstead, Richard, Curran, S.J., Croom, Scott M, Glowacki, M., Morganti, Raffaella, Tzioumis, A K, Storey, M., Sweetnam, T., Troup, E., Turner, B., Tuthill, J., Voronkov, M.A., Westmeier, T., Wilson, C.D., Zwaan, M A, Pracy, Michael, Shabala, Stanislav S, Zwaan, M.A., Allen, G, Amy, S.W., Axtens, P., Ball, Lewis, Bannister, Keith, Barker, S., Bell, M., Bock, D. C.-J., Bolton, R., Bowen, M., Boyle, B., Braun, R., Broadhurst, S., Brodrick, D., Brothers, M., Brown, A., Bunton, John D., Cantrall, C., Chapman, J., Cheng, W., Chippendale, A.P., Chung, Y., Cooray, F., Cornwell, T., DeBoer, D., Diamond, P., Edwards, P G, Ekers, Ronald D, Feain, I, Ferris, Richard H, Forsyth, R., Gough, R, Grancea, A., Gupta, N., Guzman, J.C., Hampson, G., Harvey-Smith, L., Haskins, C., Hay, S., Hayman, D.B., Heywood, I., Hotan, A.W., Hoyle, S., Humphreys, B., Indermuehle, B.T., Jacka, C., Jackson, Carole A, Jackson, S., Jeganathan, K., Johnston, S, Joseph, J., Kendall, R., Kesteven, M J, Kiraly, D., Koribalski, Baerbel S, Leach, M., Lenc, Emil, Lensson, E., Mackay, S., Macleod, A., Marquarding, M, Marvil, J., McClure-Griffiths, Naomi, McConnell, D, Mirtschin, P., Norris, R P, Neuhold, S., Ng, A., O’Sullivan, J., Pathikulangara, Joseph, Pearce, S., Phillips, C, Popping, A., Qiao, R.Y., Reynolds, J E, Roberts, P., Sault, Robert J, Schinckel, A., Serra, P., Shaw, R., Shields, M., and Shimwell, Timothy W

Abstract

We report the discovery of a new 21-cm HI absorption system using commissioning data from the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP). Using the 711.5-1015.5 MHz band of ASKAP we were able to conduct a blind search for the 21-cm line in a continuous redshift range between z = 0.4 and 1.0, which has, until now, remained largely unexplored. The absorption line is detected at z = 0.44 towards the GHz-peaked spectrum radio source PKS B1740-517 and demonstrates ASKAP's excellent capability for performing a future wide-field survey for HI absorption at these redshifts. Optical spectroscopy and imaging using the Gemini-South telescope indicates that the HI gas is intrinsic to the host galaxy of the radio source. The narrow [OIII] emission lines show clear double-peaked structure, indicating either large-scale outflow or rotation of the ionized gas. Archival data from the XMM-Newton satellite exhibit an absorbed X-ray spectrum that is consistent with a high column density obscuring medium around the active galactic nucleus. The HI absorption profile is complex, with four distinct components ranging in width from 5 to 300 km s-1 and fractional depths from 0.2 to 20 per cent. In addition to systemic HI gas, in a circumnuclear disc or ring structure aligned with the radio jet, we find evidence for a possible broad outflow of neutral gas moving at a radial velocity of v ~ 300 km s-1. We infer that the expanding young radio source (tage ≈ 2500 yr) is cocooned within a dense medium and may be driving circumnuclear neutral gas in an outflow of ~1 M o˙ yr-1.

Published
2015

2. The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type

Author

Croton, Darren J, Farrar, Glennys R, Norberg, Peder, Colless, Matthew, Peacock, John A, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Croton, Darren J, Farrar, Glennys R, Norberg, Peder, Colless, Matthew, Peacock, John A, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

We use the 2dF Galaxy Redshift Survey to measure the dependence of the b J-band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8h -1 Mpc, and on spectral type, determined from principal component analysis. We find that the galaxy populations at both extremes of density differ significantly from that at the mean density. The population in voids is dominated by late types and shows, relative to the mean, a deficit of galaxies that becomes increasingly pronounced at magnitudes brighter than M bJ, - 5 log 10 h ≲ -18.5. In contrast, cluster regions have a relative excess of very bright early-type galaxies with M bJ, - 5 log 10 h ≲ -21. Differences in the mid- to faint-end population between environments are significant: at M bJ, -5 log 10 h = -18 early- and late-type cluster galaxies show comparable abundances, whereas in voids the late types dominate by almost an order of magnitude. We find that the luminosity functions measured in all density environments, from voids to clusters, can be approximated by Schechter functions with parameters that vary smoothly with local density, but in a fashion that differs strikingly for early- and late-type galaxies. These observed variations, combined with our finding that the faint-end slope of the overall luminosity function depends at most weakly on density environment, may prove to be a significant challenge for models of galaxy formation.

Published
2005

3. The 2dF Galaxy Redshift Survey: stochastic relative biasing between galaxy populations

Author

Wild, Vivienne, Peacock, John A, Lahav, Ofer, Conway, Edward, Maddox, Steve J, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, de Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole, Lewis, Ian, Lumsden, Stuart, Madgwick, Darren, Norberg, Peder, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Wild, Vivienne, Peacock, John A, Lahav, Ofer, Conway, Edward, Maddox, Steve J, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, de Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole, Lewis, Ian, Lumsden, Stuart, Madgwick, Darren, Norberg, Peder, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

It is well known that the clustering of galaxies depends on galaxy type. Such relative bias complicates the inference of cosmological parameters from galaxy redshift surveys, and is a challenge to theories of galaxy formation and evolution. In this paper

Published
2005

4. Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue

Author

Eke, Vincent R, Baugh, Carlton M, Cole, Shaun, Frenk, Carlos S, Norberg, Peder, Peacock, John A, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Eke, Vincent R, Baugh, Carlton M, Cole, Shaun, Frenk, Carlos S, Norberg, Peder, Peacock, John A, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

The construction of a catalogue of galaxy groups from the Two-degree Field Galaxy Red-shift Survey (2dFGRS) is described. Groups are identified by means of a friends-of-friends percolation algorithm which has been thoroughly tested on mock versions of the 2dFGRS generated from cosmological N-body simulations. The tests suggest that the algorithm groups all galaxies that it should be grouping, with an additional 40 per cent of interlopers. About 55 per cent of the ∼190 000 galaxies considered are placed into groups containing at least two members of which ∼29 000 are found. Of these, ∼7000 contain at least four galaxies, and these groups have a median redshift of 0.11 and a median velocity dispersion of 260 km s -1. This 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) catalogue represents the largest available homogeneous sample of galaxy groups. It is publicly available on the World Wide Web.

Published
2004

5. The 2dF Galaxy Redshift Survey: Wiener reconstruction of the cosmic web

Author

Erdogdu, Pirin, Lahav, Ofer, Zaroubi, Saleem, Efstathiou, George, Moody, Stephen, Peacock, John A, Colless, Matthew, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Norberg, Peder, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Erdogdu, Pirin, Lahav, Ofer, Zaroubi, Saleem, Efstathiou, George, Moody, Stephen, Peacock, John A, Colless, Matthew, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Norberg, Peder, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

We reconstruct the underlying density field of the Two-degree Field Galaxy Redshift Survey (2dFGRS) for the redshift range 0.035 < z < 0.200 using the Wiener filtering method. The Wiener filter suppresses shot noise and accounts for selection and incompleteness effects. The method relies on prior knowledge of the 2dF power spectrum of fluctuations and the combination of matter density and bias parameters, however the results are only slightly affected by changes to these parameters. We present maps of the density field. We use a variable smoothing technique with two different effective resolutions: 5 and 10 h-1 Mpc at the median redshift of the survey. We identify all major superclusters and voids in the survey. In particular, we find two large superclusters and two large local voids. The full set of colour maps can be viewed on the World Wide Web at http://www.ast.cam.ac.uk/~pirin.

Published
2004

6. Substructure analysis of selected low-richness 2dFGRS clusters of galaxies

Author

Burgett, William, Vick, Michael, Davis, David, Colless, Matthew, De Propris, Roberto, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Cross, Nicholas J G, Dalton, Gavin, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Hawkins, Edward, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Norberg, Peder, Peacock, John A, Percival, Will J, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Burgett, William, Vick, Michael, Davis, David, Colless, Matthew, De Propris, Roberto, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Cross, Nicholas J G, Dalton, Gavin, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Hawkins, Edward, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Norberg, Peder, Peacock, John A, Percival, Will J, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

Complementary one-, two- and three-dimensional tests for detecting the presence of substructure in clusters of galaxies are applied to recently obtained data from the 2dF Galaxy Redshift Survey. The sample of 25 clusters used in this study includes 16 clusters not previously investigated for substructure. Substructure is detected at or greater than the 99 per cent confidence level in at least one test for 21 of the 25 clusters studied here. From the results, it appears that low-richness clusters commonly contain subclusters participating in mergers. About half of the clusters have two or more components within 0.5 h -1 Mpc of the cluster centroid, and at least three clusters (Abell 1139, Abell 1663 and Abell S333) exhibit velocity-position characteristics consistent with the presence of possible cluster rotation, shear, or infall dynamics. The geometry of certain features is consistent with influence by the host supercluster environments. In general, our results support the hypothesis that low-richness clusters relax to structureless equilibrium states on very long dynamical time-scales (if at all).

Published
2004

7. The 2dF Galaxy Redshift Survey: the clustering of galaxy groups

Author

Padilla, Nelson, Baugh, Carlton M, Eke, Vincent R, Norberg, Peder, Cole, Shaun, Frenk, Carlos S, Croton, Darren J, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peacock, John A, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Padilla, Nelson, Baugh, Carlton M, Eke, Vincent R, Norberg, Peder, Cole, Shaun, Frenk, Carlos S, Croton, Darren J, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peacock, John A, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

We measure the clustering of galaxy groups in the 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) catalogue. The 2PIGG sample has 28 877 groups with at least two members. The clustering amplitude of the full 2PIGG catalogue is weaker than that of 2dFGRS

Published
2004

8. The 2dF Galaxy Redshift Survey: voids and hierarchical scaling models

Author

Croton, Darren, Colless, Matthew, Gaztanaga, Enrique, Baugh, Carlton M, Norberg, Peder, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peacock, John A, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Croton, Darren, Colless, Matthew, Gaztanaga, Enrique, Baugh, Carlton M, Norberg, Peder, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peacock, John A, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

We measure the redshift-space reduced void probability function (VPF) for 2dFGRS volume-limited galaxy samples covering the absolute magnitude range M bJ -5log 10 h = -18 to -22. Theoretically, the VPF connects the distribution of voids to the moments of

Published
2004

9. Galaxy groups in the Two-degree Field Galaxy Redshift Survey: the luminous content of the groups

Author

Eke, Vincent R, Frenk, Carlos S, Baugh, Carlton M, Cole, Shaun, Norberg, Peder, Peacock, John A, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, de Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Eke, Vincent R, Frenk, Carlos S, Baugh, Carlton M, Cole, Shaun, Norberg, Peder, Peacock, John A, Baldry, Ivan K, Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, de Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

The Two-degree Field Galaxy Redshift Survey (2dFGRS) Percolation-Inferred Galaxy Group (2PIGG) catalogue of ∼29 000 objects is used to study the luminous content of galaxy systems of various sizes. Mock galaxy catalogues constructed from cosmological si

Published
2004

10. The 2dF Galaxy Redshift Survey: the blue galaxy fraction and implications for the Butcher-Oemler effect

Author

De Propris, Roberto, Colless, Matthew, Peacock, John A, Couch, Warrick, Driver, Simon, Balogh, Michael, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Cross, Nicholas J G, Dalton, Gavin, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Hawkins, Edward, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Norberg, Peder, Percival, Will J, Peterson, Bruce, Sutherland, William J, Taylor, Keith, De Propris, Roberto, Colless, Matthew, Peacock, John A, Couch, Warrick, Driver, Simon, Balogh, Michael, Baldry, Ivan K, Baugh, Carlton M, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Collins, Chris, Cross, Nicholas J G, Dalton, Gavin, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Hawkins, Edward, Jackson, Carole A, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve J, Madgwick, Darren, Norberg, Peder, Percival, Will J, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

We derive the fraction of blue galaxies in a sample of clusters at z < 0.11 and the general field at the same redshift. The value of the blue fraction is observed to depend on the luminosity limit adopted, cluster-centric radius and, more generally, local galaxy density, but it does not depend on cluster properties. Changes in the blue fraction are due to variations in the relative proportions of red and blue galaxies but the star formation rate for these two galaxy groups remains unchanged. Our results are most consistent with a model where the star formation rate declines rapidly and the blue galaxies tend to be dwarfs and do not favour mechanisms where the Butcher-Oemler effect is caused by processes specific to the cluster environment.

Published
2004

11. The 2dF Galaxy Redshift Survey: clustering properties of radio galaxies

Author

Magliocchetti, Manuela, Maddox, Steve J, Hawkins, Edward, Peacock, John A, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, de Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole, Jones, Bryn, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Norberg, Peder, Peterson, Bruce, Sutherland, William J, Taylor, Keith, Magliocchetti, Manuela, Maddox, Steve J, Hawkins, Edward, Peacock, John A, Bland-Hawthorn, Joss, Bridges, Terry C, Cannon, Russell, Cole, Shaun, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, de Propris, Roberto, Driver, Simon, Efstathiou, George, Ellis, Richard S, Frenk, Carlos S, Glazebrook, Karl, Jackson, Carole, Jones, Bryn, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Norberg, Peder, Peterson, Bruce, Sutherland, William J, and Taylor, Keith

Abstract

The clustering properties of local, S 1.4 GHz ≥ 1 mJy, radio sources are investigated for a sample of 820 objects drawn from the joint use of the Faint Images of the Radio Sky at 20 cm (FIRST) and 2dF Galaxy Redshift surveys. To this aim, we present 271

Published
2004

12. The 2dF Galaxy Redshift Survey: galaxy luminosity functions per spectral type

Author

Madgwick, Darren S, Lahav, Ofer, Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Jackson, Carole, Lewis, Ian, Peterson, B.A, Madgwick, Darren S, Lahav, Ofer, Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Jackson, Carole, Lewis, Ian, and Peterson, B.A

Abstract

not available

Published
2002

16. The 2dF Galaxy Redshift Survey: the population of nearby radio galaxies at the 1-mJy level

Author

Magliocchetti, Manuela, Maddox, Steve, Jackson, Carole, Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Frenk, Carlos S, Lewis, Ian, Peterson, B.A, Taylor, Keith, Magliocchetti, Manuela, Maddox, Steve, Jackson, Carole, Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Frenk, Carlos S, Lewis, Ian, Peterson, B.A, and Taylor, Keith

Abstract

not available

Published
2002

17. Radio sources in the 2dF Galaxy Redshift Survey - II. Local radio luminosity functions for AGN and star-forming galaxies at 1.4 GHz

Author

Sadler, Elaine M, Jackson, Carole, Cannon, Russell, McIntyre, Vincent J, Colless, Matthew, Peterson, B.A, Sadler, Elaine M, Jackson, Carole, Cannon, Russell, McIntyre, Vincent J, Colless, Matthew, and Peterson, B.A

Abstract

We have cross-matched the 1.4-GHz NRAO VLA Sky Survey (NVSS) with the first 210 fields observed in the 2dF Galaxy Redshift Survey (2dFGRS), covering an effective area of 325deg2 (about 20 per cent of the final 2dFGRS area). This yields a set of optical spectra of 912 candidate NVSS counterparts, of which we identify 757 as genuine radio identifications - the largest and most homogeneous set of radio source spectra ever obtained. The 2dFGRS radio sources span the redshift range z=0.005 to 0.438, and are a mixture of active galaxies (60 per cent) and star-forming galaxies (40 per cent). About 25 per cent of the 2dFGRS radio sources are spatially resolved by NVSS, and the sample includes three giant radio galaxies with projected linear size greater than 1Mpc. The high quality of the 2dF spectra means we can usually distinguish unambiguously between AGN and star-forming galaxies. We make a new determination of the local radio luminosity function at 1.4GHz for both active and star-forming galaxies, and derive a local star formation density of 0.022+/-0.004Msolaryr-1Mpc-3 (H0=50kms-1Mpc-1).

Published
2002

18. The 2dF Galaxy Redshift Survey: spectra and redshifts

Author

Colless, Matthew, Dalton, Gavin, Maddox, Steve, Sutherland, Will, Jackson, Carole, Peterson, B.A, Price, Ian, Colless, Matthew, Dalton, Gavin, Maddox, Steve, Sutherland, Will, Jackson, Carole, Peterson, B.A, and Price, Ian

Abstract

The 2dF Galaxy Redshift Survey (2dFGRS) is designed to measure redshifts for approximately 250000 galaxies. This paper describes the survey design, the spectroscopic observations, the redshift measurements and the survey data base. The 2dFGRS uses the 2dF multifibre spectrograph on the Anglo-Australian Telescope, which is capable of observing 400 objects simultaneously over a 2° diameter field. The source catalogue for the survey is a revised and extended version of the APM galaxy catalogue, and the targets are galaxies with extinction-corrected magnitudes brighter than bJ=19.45. The main survey regions are two declination strips, one in the southern Galactic hemisphere spanning 80°×15° around the SGP, and the other in the northern Galactic hemisphere spanning 75°×10° along the celestial equator; in addition, there are 99 fields spread over the southern Galactic cap. The survey covers 2000deg2 and has a median depth of z=0.11. Adaptive tiling is used to give a highly uniform sampling rate of 93 per cent over the whole survey region. Redshifts are measured from spectra covering 3600-8000Å at a two-pixel resolution of 9.0Å and a median S/N of 13pixel-1. All redshift identifications are visually checked and assigned a quality parameter Q in the range 1-5 Q>=3 redshifts are 98.4 per cent reliable and have an rms uncertainty of 85kms-1. The overall redshift completeness for Q>=3 redshifts is 91.8 per cent, but this varies with magnitude from 99 per cent for the brightest galaxies to 90 per cent for objects at the survey limit. The 2dFGRS data base is available on the World Wide Web at http://www.mso.anu.edu.au/2dFGRS.

Published
2001

19. The 2dF Galaxy Redshift Survey: the number and luminosity density of galaxies

Author

Cross, Nicholas, Driver, Simon P, Couch, Warrick, Deeley, Kathryn, Bland-Hawthorn, Joss, Price, Ian, Peterson, B.A, Jackson, Carole, Colless, Matthew, Cross, Nicholas, Driver, Simon P, Couch, Warrick, Deeley, Kathryn, Bland-Hawthorn, Joss, Price, Ian, Peterson, B.A, Jackson, Carole, and Colless, Matthew

Abstract

We present the bivariate brightness distribution (BBD) for the 2dF Galaxy Redshift Survey (2dFGRS) based on a preliminary subsample of 45 000 galaxies. The BBD is an extension of the galaxy luminosity function, incorporating surface brightness information. It allows the measurement of the local luminosity density, jB, and of the galaxy luminosity and surface brightness distributions, while accounting for surface brightness selection biases. The recovered 2dFGRS BBD shows a strong luminosity±surface brightness relation âMB / Ö2:4^1:5 0:5Ümeä; providing a new constraint for galaxy formation models. In terms of the number density, we find that the peak of the galaxy population lies at MB $216:0 mag: Within the well-defined selection limits (224 , MB ,216:0 mag; 18:0 , me , 24:5 mag arcsec22) the contribution towards the luminosity density is dominated by conventional giant galaxies (i.e., 90 per cent of the luminosity density is contained within 222:5 , M , 217:5; 18:0 , me , 23:0Ü: The luminosity-density peak lies away from the selection boundaries, implying that the 2dFGRS is complete in terms of sampling the local luminosity density, and that luminous low surface brightness galaxies are rare. The final value we derive for the local luminosity density, inclusive of surface brightness corrections, is jB à 2:49 ^ 0:20 108 h100 L( Mpc23: Representative Schechter function parameters are M* à 219:75 ^ 0:05; f* à 2:02 ^ 0:02 1022 and aà 21:09 ^ 0:03: Finally, we note that extending the conventional methodology to incorporate surface brightness selection effects has resulted in an increase in the luminosity density of ,37 per cent. Hence surface brightness selection effects would appear to explain much of the discrepancy between previous estimates of the local luminosity density.

Published
2001

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