Publications (22)
Increasing AGN sample completeness using long-term near-infrared variability
K. Green, E. Elmer, D. T. Maltby +3
In this work, we use 8 years of deep near-infrared imaging to select and study a new set of 601 active galaxies identified through long-term near-infrared (NIR) variability in the…
The role of mass and environment in the build up of the quenched galaxy population since cosmic noon
E. Taylor, O. Almaini, M. Merrifield +4
We conduct the first study of how the relative quenching probability of galaxies depends on environment over the redshift range , using data from the UKIDSS Ultra-Deep…
SDSS-IV MaNGA: Uncovering the Angular Momentum Content of Central and Satellite Early-type Galaxies
Jenny E. Greene, Alexie Leauthaud, Eric Emsellem +18
We study 379 central and 159 satellite early-type galaxies with two-dimensional kinematics from the integral-field survey Mapping Nearby Galaxies at APO (MaNGA) to determine how th…
SDSS-IV MaNGA: Properties of galaxies with kinematically decoupled stellar and gaseous components
Yifei Jin, Yanmei Chen, Yong Shi +30
We study the properties of 66 galaxies with kinematically misaligned gas and stars from MaNGA survey. The fraction of kinematically misaligned galaxies varies with galaxy physical…
The Planetary Nebulae Spectrograph: the green light for Galaxy Kinematics
N. G. Douglas, M. Arnaboldi, K. C. Freeman +10
Planetary nebulae are now well established as probes of galaxy dynamics and as standard candles in distance determinations. Motivated by the need to improve the efficiency of plane…
Probing the kinematic morphology-density relation of early-type galaxies with MaNGA
J. E. Greene, A. Leauthaud, E. Emsellem +17
The "kinematic" morphology-density relation for early-type galaxies posits that those galaxies with low angular momentum are preferentially found in the highest-density regions of…
Nuclear Properties of Nearby Spiral Galaxies from Hubble Space Telescope NICMOS imaging and STIS Spectroscopy
M. A. Hughes, D. Axon, J. Atkinson +16
We investigate the central regions of 23 spiral galaxies using archival NICMOS imaging and STIS spectroscopy. The sample is taken from our program to determine the masses of centra…
Planetary nebulae populations in the haloes of nearby massive early-type galaxies
J. Hartke, M. Arnaboldi, O. Gerhard +8
Planetary nebulae (PNe) are excellent tracers of the metal-poor haloes of nearby early-type galaxies. They are commonly used to trace spatial distribution and kinematics of the hal…
The halo of M105 and its group environment as traced by planetary nebula populations: II. Using kinematics of single stars to unveil the presence of intragroup light around the Leo I galaxies NGC 3384 and M105
J. Hartke, M. Arnaboldi, O. Gerhard +11
M105 is an early-type galaxy in the nearby Leo I group, the closest galaxy group to contain all galaxy types and therefore an excellent environment to explore the low-mass end of i…
The halo of M105 and its group environment as traced by planetary nebula populations: I. Wide-field photometric survey of planetary nebulae in the Leo I group
J. Hartke, M. Arnaboldi, O. Gerhard +6
M105 (NGC 3379) is an early-type galaxy in the Leo I group. This group is the nearest group that contains all main galaxy types and can thus be used as a benchmark to study the pro…
Nuclear properties of a sample of nearby spirals from STIS imaging
C. Scarlata, M. Stiavelli, M. Hughes +17
We present surface photometry for the central regions of a sample of 48 spiral galaxies (mostly unbarred and barred of types Sbc or Sc) observed with the Space Telescope Imaging Sp…
Three dynamically distinct stellar populations in the halo of M49
J. Hartke, M. Arnaboldi, O. Gerhard +6
M49 (NGC 4472) is the dominant galaxy in subcluster B of the Virgo Cluster, and a benchmark for studying the build-up of the extended halos of brightest group galaxies in the outsk…
SNITCH: Seeking a simple, informative star formation history inference tool
R. J. Smethurst, M. Merrifield, C. J. Lintott +7
Deriving a simple, analytic galaxy star formation history (SFH) using observational data is a complex task without the proper tool to hand. We therefore present SNITCH, an open sou…
The black hole mass vs bulge mass relationship in spiral galaxies
A. Marconi, D. Axon, J. Atkinson +15
We describe an on-going HST program aimed at determining the relationship between the nuclear black hole mass and bulge mass in spiral galaxies. We have selected a volume limited s…
Long-term NIR Variability in the UKIDSS Ultra Deep Survey: a new probe of AGN activity at high redshift
E. Elmer, O. Almaini, M. Merrifield +5
We present the first attempt to select AGN using long-term NIR variability. By analysing the K-band light curves of all the galaxies in the UKIDSS Ultra Deep Survey, the deepest NI…
Resolving the Disc-Halo Degeneracy I: A Look at NGC 628
S. Aniyan, K. C. Freeman, M. Arnaboldi +6
The decomposition of the rotation curve of galaxies into contribution from the disc and dark halo remains uncertain and depends on the adopted mass to light ratio (M/L) of the disc…
Integral Field Spectroscopy of 23 Spiral Bulges
D. Batcheldor, D. Axon, D. Merritt +7
We have obtained Integral Field Spectroscopy for 23 spiral bulges using INTEGRAL on the William Herschel Telescope and SPIRAL on the Anglo-Australian Telescope. This is the first 2…
Resolving the Disc-Halo Degeneracy II: NGC 6946
S. Aniyan, A. A. Ponomareva, K. C. Freeman +5
The mass-to-light ratio (M/L) is a key parameter in decomposing galactic rotation curves into contributions from the baryonic components and the dark halo of a galaxy. One direct o…
SDSS-IV MaNGA: Bar pattern speed estimates with the Tremaine-Weinberg method and their error sources
L. Garma-Oehmichen, M. Cano-DÃaz, H. Hernández-Toledo +5
Estimating the bar pattern speed (\Om{}) is one of the main challenges faced in understanding the role of stellar bars in galaxy dynamical evolution. This work aims to characterise…
Mapping the Stellar Dynamics of M31
Helen Merrett, M. Merrifield, K. Kuijken +12
Using the Planetary Nebula Spectrograph, we have observed and measured the velocities for some 2764 PNe in the disk and halo of the Andromeda galaxy. Preliminary analysis using a b…
Infrared lags in the light curves of AGN measured using a deep survey
E. Elmer, M. Merrifield, O. Almaini +2
Information on the structure around active galactic nuclei (AGN) has long been derived from measuring lags in their varying light output at different wavelengths. In principle, inf…
Properties of barred galaxies in the MaNGA galaxy survey
A. Fraser-McKelvie, M. Merrifield, A. Aragón-Salamanca +2
We present the initial results of a census of 684 barred galaxies in the MaNGA galaxy survey. This large sample contains galaxies with a wide range of physical properties, and we a…