Daniel J. Farrow
A5029995428- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Impact of Light on Environment and Health
- Particle Accelerators and Free-Electron Lasers
- Photocathodes and Microchannel Plates
- Dark Matter and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Gaussian Processes and Bayesian Inference
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Species Distribution and Climate Change
- History and Developments in Astronomy
- COVID-19 epidemiological studies
University of Hull
2023-2024
Max Planck Institute for Extraterrestrial Physics
2015-2023
Ludwig-Maximilians-Universität München
2021-2023
Stuttgart Observatory
2022
Durham University
2013-2020
Optica
2016
Max Planck Society
2016
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 ($...
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 present cosmological parameter constraints from a joint analysis of three probes: the tomographic cosmic shear signal in $\sim$450 deg$^2$ data Kilo Degree Survey (KiDS), galaxy-matter cross-correlation galaxies Galaxies And Mass Assembly (GAMA) survey determined with KiDS weak lensing, and angular correlation function same GAMA galaxies. use fast power spectrum estimators that are based on simple integrals over real-space functions, show they practically unbiased relevant frequency...
We describe data release 3 (DR3) of the Galaxy And Mass Assembly (GAMA) survey. The GAMA survey is a spectroscopic redshift and multi-wavelength photometric in three equatorial regions each 60.0 deg^2 (G09, G12, G15), two southern 55.7 (G02) 50.6 (G23). DR3 consists of: first covering G02 region on H-ATLAS sources regions; updates to released DR2. includes 154809 with secure redshifts across four regions. A subset 95.5% complete r<19.8 over an area 19.5 deg^2, 20086 galaxy redshifts, that...
In Galaxy And Mass Assembly Data Release 4 (GAMA DR4), we make available our full spectroscopic redshift sample. This includes 248682 galaxy spectra, and, in combination with earlier surveys, results 330542 redshifts across five sky regions covering ~250deg^2. The density, is the highest over such a sustained area, has exceptionally high completeness (95 per cent to r_KIDS=19.65mag), and well suited for study of mergers, groups, low (z<0.25) population. DR4 32 value-added tables or...
Abstract Over 3 billion astronomical sources have been detected in the more than 22 million orthogonal transfer CCD images obtained as part of Pan-STARRS1 π survey. 85 instances those automatically and characterized by Pan-STARRS Image Processing Pipeline photometry software, psphot . This fast, automatic, reliable software was developed for project but is easily adaptable to from other telescopes. We describe analysis general well specific case third processing version used first two public...
We describe the survey design, calibration, commissioning, and emission-line detection algorithms for Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). The goal of HETDEX is to measure redshifts over a million Ly$\alpha$ emitting galaxies between 1.88<z<3.52, in 540 deg^2 area encompassing co-moving volume 10.9 Gpc^3. No pre-selection targets involved; instead measurements are accomplished via spectroscopic using suite wide-field integral field units distributed focal plane telescope....
Abstract We present the first publicly released catalog of sources obtained from Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is an integral field spectroscopic survey designed to measure Hubble expansion parameter and angular diameter distance at 1.88 < z 3.52 by using spatial distribution more than a million Ly α -emitting galaxies over total target area 540 deg 2 . The comes contiguous fiber spectra coverage 25 sky 2017 January through 2020 June, where object...
We use the WISE-2MASS infrared galaxy catalog matched with Pan-STARRS1 (PS1) galaxies to search for a supervoid in direction of Cosmic Microwave Background Cold Spot. Our imaging has median redshift $z\simeq 0.14$, and we obtain photometric redshifts from PS1 optical colours create tomographic map distribution. The radial profile centred on Spot shows large low density region, extending over 10's degrees. Motivated by previous results, test underdensities within two angular radii, $5^\circ$,...
The Pan-STARRS1 (PS1) survey has obtained imaging in 5 bands (grizy_P1) over 10 Medium Deep Survey (MDS) fields covering a total of 70 square degrees. This paper describes the search for apparently hostless supernovae (SNe) within first year PS1 MDS data with an aim discovering new superluminous (SLSNe). A 249 transients were discovered down to limiting magnitude M_AB ~ 23.5, which 76 classified as Type Ia SNe. There 57 SNe complete light curves that are likely core-collapse (CCSNe) or SLSNe...
We investigate the dependence of galaxy luminosity function on geometric environment within Galaxy And Mass Assembly (GAMA) survey. The tidal tensor prescription, based Hessian pseudo-gravitational potential, is used to classify cosmic web and define environments: for a given smoothing scale, we every position surveyed region, $0.04<{z}<0.26$, as either void, sheet, filament or knot. consider how choose appropriate thresholds in eigenvalues order partition galaxies approximately evenly...
We measure the projected 2-point correlation function of galaxies in 180 deg$^2$ equatorial regions GAMA II survey, for four different redshift slices between z = 0.0 and z=0.5. To do this we further develop Cole (2011) method producing suitable random catalogues calculation functions. find that more r-band luminous, massive redder are clustered. also red have stronger clustering on scales less than ~3 $h^{-1}$ Mpc. compare to two versions GALFORM galaxy formation model, Lacey et al (in...
We investigate possible signatures of halo assembly bias for spectroscopically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) survey using weak lensing measurements spatially overlapping regions deeper, high-imaging-quality photometric Kilo-Degree Survey. use GAMA with an apparent richness larger than 4 to identify samples comparable mean host masses but a different radial distribution satellite galaxies, which is proxy formation time haloes. measure signal steeper average...
We measure the projected galaxy clustering and galaxy-galaxy lensing signals using Galaxy And Mass Assembly (GAMA) survey Kilo-Degree Survey (KiDS) to study bias. use concept of non-linear stochastic biasing in framework halo occupation statistics constrain parameters unveil origin biasing. The bias function $Γ_{\text{gm}}(r_{\text{p}})$, where $r_{\text{p}}$ is comoving separation, evaluated analytical model from which scale dependence non-linearity stochasticity models can be inferred. Our...
Abstract We present the median-stacked Lyman -α ( Ly α ) surface brightness profiles of 968 spectroscopically selected emitting galaxies (LAEs) at redshifts 1.9 < z 3.5 in early data Hobby-Eberly Telescope Dark Energy Experiment. The LAEs are high-confidence detections with high signal-to-noise ratios observed good seeing conditions (point-spread function FWHM <1.″4), excluding active galactic nuclei. luminosities 10 42.4 –10 43 erg s −1 . detect faint emission radial level <?CDATA...
The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of Universe at $z \sim 2.4$ 1% precision for both $H(z)$ and $D_A(z)$. HETDEX in process mapping excess one million Lyman Alpha emitting (LAE) galaxies a similar number lower-z as tracer large-scale structure. success measurement predicated on post-observation separation with Ly$\alpha$ emission from lower-$z$ interloping galaxies, primarily [OII], low...
Abstract We present the active galactic nuclei (AGN) catalog from fourth data release (HDR4) of Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). HETDEX is an untargeted spectroscopic survey. HDR4 contains 345,874 Integral Field Unit observations 2017 January to 2023 August covering effective area 62.9 deg 2 . With no imaging preselection, our confirmed AGN sample includes low-luminosity AGN, narrow-line and/or red down g ∼ 25. This has 15,940 across redshifts z = 0.1 4.6,...
We directly constrain the non-linear alignment (NLA) model of intrinsic galaxy alignments, analysing most representative and complete flux-limited sample spectroscopic galaxies available for cosmic shear surveys. measure projected position-intrinsic correlations clustering signal using high-resolution imaging from Kilo Degree Survey (KiDS) overlapping with GAMA survey, data Sloan Digital Sky Survey. Separating samples by colour, we make no significant detection blue constraining NLA...
The construction of catalogues a particular type galaxy can be complicated by interlopers contaminating the sample. In spectroscopic surveys this due to misclassification an emission line; for example in Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) low redshift [OII] emitters may make up few percent observed Ly${\alpha}$ emitter (LAE) presence contaminants affects measured correlation functions and power spectra. Previous attempts deal with using cross-correlation function have...
The Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1) survey is acquiring multi-epoch imaging in five bands (gP1, rP1, iP1, zP1, yP1) over the entire sky north of declination −30° (the 3π survey). In 2011 July a test area about 70 deg2 was observed to expected final depth main survey. this, first series papers targeting galaxy count clustering properties combined data, we present detailed investigation into reliability Pan-STARRS1 analysis software. We show that reduction...
The Pan-STARRS1 survey is currently obtaining imaging in 5 bands (grizy) for the $3\pi$ steradian survey, one of largest optical surveys ever conducted. finished will have spatially varying depth, due to strategy. This paper presents a method correct galaxy number counts and clustering this potential systematic based on simplified signal noise measurement. A star separation calibrated using realistic synthetic images also presented, along with an approach mask bright stars. By our techniques...
We study present-day galaxy clustering in the eagle cosmological hydrodynamical simulation. eagle's formation parameters were calibrated to reproduce redshift z = 0.1 stellar mass function, and simulation also reproduces colours well. The volume is too small correctly sample large-scale fluctuations we therefore concentrate on scales smaller than a few mega parsecs. find very good agreement with observed measurements from Galaxy And Mass Assembly (GAMA) survey, when galaxies are binned by...
Abstract We present Ly α and ultraviolet (UV)-continuum luminosity functions (LFs) of galaxies active galactic nuclei (AGNs) at z = 2.0–3.5 determined by the untargeted optical spectroscopic survey Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). combine deep Subaru imaging with HETDEX spectra resulting in 11.4 deg 2 fiber sky coverage, obtaining 18,320 spectroscopically identified emission, 2126 which host type 1 AGNs showing broad (FWHM > 1000 km s −1 ) emission lines. derive...
Abstract We investigate the stellar mass–black hole mass ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi mathvariant="italic"></mml:mi> </mml:mrow> <mml:mo>*</mml:mo> </mml:msub> <mml:mo>–</mml:mo> <mml:mi>BH</mml:mi> </mml:math> ) relation with type 1 active galactic nuclei (AGNs) down to <mml:mo>=</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>7</mml:mn> <mml:mspace width="0.11em"/> </mml:msup> <mml:mi>M</mml:mi>...