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26 papers · 1 filter
Focal ratio degradation in lightly-fused hexabundles
Julia Bryant, Joss Bland-Hawthorn, Lisa Fogarty +2
We are now moving into an era where multi-object wide-field surveys, which traditionally use single fibres to observe many targets simultaneously, can exploit compact integral fiel…
Galaxy And Mass Assembly (GAMA): The large scale structure of galaxies and comparison to mock universes
Mehmet Alpaslan, Aaron S. G. Robotham, Simon Driver +18
From a volume limited sample of 45,542 galaxies and 6,000 groups with we use an adapted minimal spanning tree algorithm to identify and classify large scale structur…
Beating the classical limit: A diffraction-limited spectrograph for an arbitrary input beam
Christopher H. Betters, Sergio G. Leon-Saval, J. Gordon Robertson +1
We demonstrate a new approach to classical fiber-fed spectroscopy. Our method is to use a photonic lantern that converts an arbitrary (e.g. incoherent) input beam into N diffractio…
Galaxy And Mass Assembly (GAMA): improved cosmic growth measurements using multiple tracers of large-scale structure
Chris Blake, Ivan K. Baldry, Joss Bland-Hawthorn +11
We present the first application of a "multiple-tracer" redshift-space distortion (RSD) analysis to an observational galaxy sample, using data from the Galaxy and Mass Assembly sur…
Fossil imprint of a powerful flare at the Galactic Centre along the Magellanic Stream
Joss Bland-Hawthorn, Phil Maloney, Ralph Sutherland +1
The Fermi satellite discovery of the gamma-ray emitting bubbles extending 50 deg (10 kpc) from the Galactic Centre has revitalized earlier claims that our Galaxy has undergone an e…
A RAVE Investigation on Galactic open Clusters I. Radial velocities and metallicities
C. Conrad, R. -D. Scholz, N. V. Kharchenko +25
Context. Galactic open clusters (OCs) mainly belong to the young stellar population in the Milky Way disk, but are there groups and complexes of OCs that possibly define an additio…
The RAdial Velocity Experiment (RAVE): Fourth data release
G. Kordopatis, G. Gilmore, M. Steinmetz +48
We present the stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity), radial velocities, individual abundances and distances determined for 4…
Chromospherically Active Stars in the RAVE Survey. I. The Catalogue
M. Žerjal, T. Zwitter, G. Matijevič +15
RAVE, the unbiased magnitude limited survey of the southern sky stars, contained 456,676 medium-resolution spectra at the time of our analysis. Spectra cover the CaII IRT range whi…
Galactic kinematics and dynamics from RAVE stars
James Binney, Ben Burnett, Georges Kordopatis +15
We analyse the kinematics of ~400000 RAVE stars. We split the sample into hot and cold dwarfs, red-clump and non-clump giants. The kinematics of the clump giants are consistent wit…
Constraints on the Galactic Bar from the Hercules stream as traced with RAVE across the Galaxy
T. Antoja, A. Helmi, W. Dehnen +20
Non-axisymmetries in the Galactic potential (spiral arms and bar) induce kinematic groups such as the Hercules stream. Assuming that Hercules is caused by the effects of the Outer…
New distances to RAVE stars
James Binney, Ben Burnett, Georges Kordopatis +16
Probability density functions are determined from new stellar parameters for the distance moduli of stars for which the RAdial Velocity Experiment (RAVE) has obtained spectra with…
The Epoch of Assembly of Two Galaxy Groups: A comparative study
Matthew Nichols, Joss Bland-Hawthorn
Nearby galaxy groups of comparable mass to the Local Group show global variations that reflect differences in their evolutionary history. Satellite galaxies in groups have higher l…
The asymmetric drift, the local standard of rest, and implications from RAVE data
O. Golubov, A. Just, O. Bienaymé +13
The determination of the LSR is still a matter of debate. The classical value of the tangential peculiar motion of the Sun with respect to the LSR was challenged in recent years, c…
An empirical formula for the distribution function of a thin exponential disc
Sanjib Sharma, Joss Bland-Hawthorn
An empirical formula for a Shu distribution function that reproduces a thin disc with exponential surface density to good accuracy is presented. The formula has two free parameters…
Galaxy and Mass Assembly (GAMA): galaxy radial alignments in GAMA groups
Michael D. Schneider, Shaun Cole, Carlos S. Frenk +10
We constrain the distributions of projected radial alignment angles of satellite galaxy shapes within the Galaxy And Mass Assembly survey group catalogue. We identify the galaxy gr…
Galaxy And Mass Assembly (GAMA): Linking Star Formation Histories and Stellar Mass Growth
Amanda E. Bauer, A. M. Hopkins, M. Gunawardhana +23
We present evidence for stochastic star formation histories in low-mass (M* < 10^10 Msun) galaxies from observations within the Galaxy And Mass Assembly (GAMA) survey. For ~73,000…
Choirs, HI Galaxy Groups: Catalogue and Detection of Star-forming Dwarf Group Members
Sarah M. Sweet, Gerhardt Meurer, Michael J. Drinkwater +24
Hα observations centred on galaxies selected from the HI Parkes All Sky Survey (HIPASS, Barnes et al. 2001) typically show one and sometimes two star-forming galaxies within the ap…
The COS/UVES Absorption Survey of the Magellanic Stream: I. One-Tenth Solar Abundances along the Body of the Stream
Andrew J. Fox, Philipp Richter, Bart P. Wakker +5
The Magellanic Stream (MS) is a massive and extended tail of multi-phase gas stripped out of the Magellanic Clouds and interacting with the Galactic halo. In this first paper of an…
The COS/UVES Absorption Survey of the Magellanic Stream: II. Evidence for a complex enrichment history of the Stream from the Fairall 9 sightline
Philipp Richter, Andrew J. Fox, Bart P. Wakker +5
We present a multi-wavelength study of the Magellanic Stream (MS), a massive gaseous structure in the Local Group that is believed to represent material stripped from the Magellani…
The relation between chemical abundances and kinematics of the Galactic disc with RAVE
C. Boeche, C. Chiappini, I. Minchev +20
Aims: We study the relations between stellar kinematics and chemical abundances of a large sample of RAVE giants in search for selection criteria needed for disentangling different…
The wobbly Galaxy: kinematics north and south with RAVE red clump giants
M. E. K. Williams, M. Steinmetz, J. Binney +23
The RAVE survey, combined with proper motions and distance estimates, can be used to study in detail stellar kinematics in the extended solar neighbourhood (solar suburb). Using th…
Galaxy And Mass Assembly (GAMA): The Life and Times of L* Galaxies
A. S. G. Robotham, J. Liske, S. P. Driver +18
In this work we investigate in detail the effects local environment (groups and pairs) has on galaxies with stellar mass similar to the Milky-Way (L* galaxies). A volume limited sa…
Galaxy And Mass Assembly (GAMA): Spectroscopic analysis
A. M. Hopkins, S. P. Driver, S. Brough +79
The Galaxy And Mass Assembly (GAMA) survey is a multiwavelength photometric and spectroscopic survey, using the AAOmega spectrograph on the Anglo-Australian Telescope to obtain spe…
PRAXIS: a low background NIR spectrograph for fibre Bragg grating OH suppression
Anthony Horton, Simon Ellis, Jon Lawrence +1
Fibre Bragg grating (FBG) OH suppression is capable of greatly reducing the bright sky background seen by near infrared spectrographs. By filtering out the airglow emission lines a…