P. Norberg
A5041585242- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Gamma-ray bursts and supernovae
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Impact of Light on Environment and Health
- Neutrino Physics Research
- CCD and CMOS Imaging Sensors
- Astrophysical Phenomena and Observations
- Gaussian Processes and Bayesian Inference
- Advanced Vision and Imaging
- Statistical Methods and Inference
- Advanced Image Processing Techniques
Fermi National Accelerator Laboratory
2024-2025
Durham University
2015-2024
University of Puerto Rico-Mayaguez
2017-2023
Institute of High Energy Physics
2018-2023
A. Alikhanyan National Laboratory
2023
Stockholm University
2022
Campbell Collaboration
2019
West Africa Vocational Education
2019
University of Edinburgh
2006-2014
UK Astronomy Technology Centre
2007-2014
The 2dF Galaxy Redshift Survey (2dFGRS) is designed to measure redshifts for approximately 250-000 galaxies. This paper describes the survey design, spectroscopic observations, redshift measurements and data base. 2dFGRS uses multifibre spectrograph on Anglo-Australian Telescope, which capable of observing 400 objects simultaneously over a 2° diameter field. source catalogue revised extended version APM galaxy catalogue, targets are galaxies with extinction-corrected magnitudes brighter than...
We present a power-spectrum analysis of the final 2dF Galaxy Redshift Survey (2dFGRS), employing direct Fourier method. The sample used comprises 221 414 galaxies with measured redshifts. investigate in detail modelling selection, improving on previous treatments number respects. A new angular mask is derived, based revisions to photometric calibration. redshift selection function determined by dividing survey according rest-frame colour, and deducing self-consistent treatment k-corrections...
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
The Galaxy And Mass Assembly (GAMA) survey has been operating since February 2008 on the 3.9-m Anglo-Australian Telescope using AAOmega fibre-fed spectrograph facility to acquire spectra with a resolution of R~1300 for 120,862 SDSS selected galaxies. target catalogue constitutes three contiguous equatorial regions centred at 9h (G09), 12h (G12) and 14.5h (G15) each 12 x 4 sq.deg limiting fluxes r < 19.4, 19.8, 19.4 mag respectively (and additional limits other wavelengths). Spectra reliable...
We combine the Two Micron All Sky Survey (2MASS) Extended Source Catalogue and 2dF Galaxy Redshift to produce an infrared selected galaxy catalogue with 17 173 measured redshifts. use this extensive data set estimate luminosity functions in J- KS-bands. The are fairly well fitted by Schechter parameters MJ*−5 log h = −22.36±0.02, αJ −0.93±0.04, ΦJ* 0.0104±0.0016 h3 Mpc−3 J-band MKS*−5 −23.44±0.03, αKS −0.96±0.05, ΦKS* 0.0108±0.0016 KS-band (2MASS Kron magnitudes). These derived assuming a...
The 2dF Galaxy Redshift Survey has now measured in excess of 160-000 galaxy redshifts. This paper presents the power spectrum distribution, calculated using a direct Fourier transform based technique. We argue that, within k-space region , shape this should be close to that linear density perturbations convolved with window function survey. and its convolving effect on estimate are analysed detail. By model spectra, we able fit power-spectrum data provide measure matter content Universe. Our...
We present a detailed analysis of the two-point correlation function, ξ(σ, π), from 2dF Galaxy Redshift Survey (2dFGRS). The large size catalogue, which contains ∼220 000 redshifts, allows us to make high-precision measurements various properties galaxy clustering pattern. effective redshift at our estimates are made is zs≈ 0.15, and similarly luminosity, Ls≈ 1.4L*. estimate redshift-space ξ(s), we measure length, s0= 6.82 ± 0.28 h−1 Mpc. also projected Ξ(σ), real-space ξ(r), can be fit by...
This paper describes the first catalogue of photometrically-derived stellar mass estimates for intermediate-redshift (z < 0.65) galaxies in Galaxy And Mass Assembly (GAMA) spectroscopic redshift survey. These masses, as well full set ancillary population parameters, will be made public part GAMA data release 2. Although database does include NIR photometry, we show that quality our synthesis fits is significantly poorer when these are included. Further, a large fraction galaxies, parameters...
We compute the bispectrum of 2dF Galaxy Redshift Survey (2dFGRS) and use it to measure bias parameter galaxies. This quantifies strength clustering galaxies relative mass in Universe. By analysing 80 × 106 triangle configurations wavenumber range 0.1 < k 0.5 h Mpc−1 (i.e. on scales roughly between 5 30 h−1 Mpc) we find that linear is consistent with unity: b1= 1.04 ± 0.11, quadratic (non-linear) zero: b2=−0.054 0.08. Thus, at least large scales, optically selected do indeed trace underlying...
We have measured the equivalent width of Hα emission line for 11 006 galaxies brighter than Mb=−19 (ΩΛ= 0.7, Ωm= 0.3, H0= 70 km s−1 Mpc−1) at 0.05 < z 0.1 in 2dF Galaxy Redshift Survey (2dFGRS), fields 17 known galaxy clusters. The limited redshift range ensures that our results are insensitive to aperture bias, and residuals from night sky lines. use these measurements trace μ*, star formation rate normalized L*, as a function distance cluster centre, local projected density. find...
The Galaxy And Mass Assembly (GAMA) survey is one of the largest contemporary spectroscopic surveys low redshift galaxies. Covering an area ∼286 deg2 (split among five regions) down to a limiting magnitude r < 19.8 mag, we have collected spectra and reliable redshifts for 238 000 objects using AAOmega spectrograph on Anglo-Australian Telescope. In addition, assembled imaging data from number independent in order generate photometry spanning wavelength range 1 nm–1 m. Here, report recently...
We investigate the dependence of galaxy clustering on luminosity and spectral type using 2dF Galaxy Redshift Survey (2dFGRS). Spectral types are assigned principal-component analysis Madgwick et al. divide sample into two broad classes: galaxies with strong emission lines ('late types') more quiescent ('early types'). measure in real space, free from any distortion pattern owing to peculiar velocities, for a series volume-limited samples. The projected correlation functions both well...
We investigate the dependence of strength galaxy clustering on intrinsic luminosity using Anglo-Australian two degree field redshift survey (2dFGRS). The 2dFGRS is over an order magnitude larger than previous surveys used to address this issue. measure projected two-point correlation function galaxies in a series volume-limited samples. free from any distortion pattern induced by peculiar motions and well described power law pair separation range . real space well-fitted length power-law...
We determine the low-redshift field galaxy stellar mass function (GSMF) using an area of 143 deg^2 from first three years Galaxy And Mass Assembly (GAMA) survey. The magnitude limits this redshift survey are r < 19.4 mag over two thirds and 19.8 one third area. GSMF is determined a sample 5210 galaxies density-corrected maximum volume method. This efficiently overcomes issue fluctuations in number density versus redshift. With H_0 = 70, well described between 10^8 10^11.5 Msun double...
We analyse the observed correlation between galaxy environment and H-alpha emission line strength, using volume-limited samples group catalogues of 24968 galaxies drawn from 2dF Galaxy Redshift Survey (Mb<-19.5) Sloan Digital Sky (Mr<-20.6). characterise by 1) Sigma_5, surface number density determined projected distance to 5th nearest neighbour; 2) rho1.1 rho5.5, three-dimensional estimates obtained convolving distribution with Gaussian kernels dispersion 1.1 Mpc 5.5 Mpc, respectively. find...
Euclid is a space-based survey mission from the European Space Agency designed to understand origin of Universe's accelerating expansion. It will use cosmological probes investigate nature dark energy, matter and gravity by tracking their observational signatures on geometry universe cosmic history structure formation. The optimised for two independent primary probes: Weak gravitational Lensing (WL) Baryonic Acoustic Oscillations (BAO). payload consists 1.2 m Korsch telescope provide large...
We use more than 110500 galaxies from the 2dF galaxy redshift survey (2dFGRS) to estimate b_J-band luminosity function at z=0, taking account of evolution, distribution magnitude measurement errors and small corrections for incompletenessin catalogue. Throughout interval -16.5>M- 5log h>-22, is accurately described by a Schechter with M* -5log h =-19.66+/-0.07, alpha=-1.21+/-0.03 phistar=(1.61+/-0.08) 10^{-2} h^3/Mpc^3, giving an integrated density rho_L=(1.82+/-0.17) 10^8 L_sol/Mpc^3...
We present a test of different error estimators for 2-point clustering statistics, appropriate and future large galaxy redshift surveys. Using an ensemble very dark matter LambdaCDM N-body simulations, we compare internal (jackknife bootstrap) to external ones (Monte-Carlo realizations). For 3-dimensional find that none the methods investigated are able reproduce neither accurately nor robustly errors on 1 25 Mpc/h scales. The standard bootstrap overestimates variance xi(s) by ~40% all...
Using the complete Galaxy and Mass Assembly I (GAMA-I) survey covering ∼142 deg2 to rAB= 19.4, of which ∼47 is 19.8, we create GAMA-I galaxy group catalogue (G3Cv1), generated using a friends-of-friends (FoF) based grouping algorithm. Our algorithm has been tested extensively on one family mock GAMA lightcones, constructed from Λ cold dark matter N-body simulations populated with semi-analytic galaxies. Recovered properties are robust effects interlopers median unbiased in most important...
We present single-S\'ersic two-dimensional model fits to 167,600 galaxies modelled independently in the ugrizYJHK bandpasses using reprocessed Sloan Digital Sky Survey Data Release Seven (SDSS DR7) and UKIRT Infrared Deep Large Area (UKIDSS-LAS) imaging data available from GAMA database. In order facilitate this study we developed SIGMA, an R wrapper around several contemporary astronomy software packages including Source Extractor, PSF Extractor GALFIT 3. SIGMA produces realistic 2D...
This paper describes the organization of database and catalog data products from Pan-STARRS1 $3\pi$ Steradian Survey. The are available in form an SQL-based relational MAST, Mikulski Archive for Space Telescopes at STScI. is described detail, including construction database, provenance data, schema, how tables related. Examples queries a range science goals included.
We use data from the Galaxy And Mass Assembly (GAMA) survey in redshift range 0.01$<$z$<$0.1 (8399 galaxies $g$ to $K_s$ bands) derive stellar mass $-$ half-light radius relations for various divisions of 'early' and 'late'-type samples. find choice division between early late (i.e., colour, shape, morphology) is not particularly critical, however, adopted limits sample selections careful rejection outliers robust fitting methods) are important. In particular we note that samples extending...
We present the first application of a 'multiple-tracer' redshift-space distortion (RSD) analysis to an observational galaxy sample, using data from Galaxy and Mass Assembly (GAMA) survey. Our set is r < 19.8 magnitude-limited sample 178 579 galaxies covering redshift interval z 0.5 area 180 deg2. obtain improvements 10–20 per cent in measurements gravitational growth rate compared single-tracer analysis, deriving correlated variance imprinted distributions overlapping populations. new...