Publications (39)
SDSS-IV MaNGA: The Different Quenching Histories of Fast and Slow Rotators
Rebecca Smethurst, Karen Masters, Chris Lintott +9
Do the theorised different formation mechanisms of fast and slow rotators produce an observable difference in their star formation histories? To study this we identify quenching sl…
SDSS-IV MaNGA: Cannibalism Caught in the Act -- on the Frequency of Occurrence of Multiple Cores in Brightest Cluster Galaxies
Yun-Hsin Hsu, Yen-Ting Lin, Song Huang +16
Although it is generally accepted that massive galaxies form in a two-phased fashion, beginning with a rapid mass buildup through intense starburst activities, followed by primaril…
The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA Derived Quantities, Data Visualization Tools and Stellar Library
D. S. Aguado, Romina Ahumada, Andres Almeida +230
Twenty years have passed since first light for the Sloan Digital Sky Survey (SDSS). Here, we release data taken by the fourth phase of SDSS (SDSS-IV) across its first three years o…
The separate effect of halo mass and stellar mass on the evolution of massive disk galaxies
Shuang Zhou, Alfonso Aragón-Salamanca, Michael Merrifield
We analyse a sample of massive disk galaxies selected from the SDSS-IV/MaNGA survey to investigate how the evolution of these galaxies depends on their stellar and halo masses. We…
SDSS-IV MaNGA: pattern speeds of barred galaxies
Rui Guo, Shude Mao, E. Athanassoula +5
The MaNGA project has obtained IFU data for several thousand nearby galaxies, including barred galaxies. With the two dimensional spectral and kinematic information provided by IFU…
SDSS-IV MaNGA: When is morphology imprinted on galaxies?
Thomas Peterken, Michael Merrifield, Alfonso Aragón-Salamanca +4
It remains an open question as to how long ago the morphology that we see in a present-day galaxy was typically imprinted. Studies of galaxy populations at different redshifts reve…
The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
Romina Ahumada, Carlos Allende Prieto, Andres Almeida +310
This paper documents the sixteenth data release (DR16) from the Sloan Digital Sky Surveys; the fourth and penultimate from the fourth phase (SDSS-IV). This is the first release of…
SDSS-IV MaNGA: Star formation cessation in low-redshift galaxies I. Dependence on stellar mass and structural properties
Enci Wang, Cheng Li, Ting Xiao +8
We investigate radial gradients in the recent star formation history (SFH) using 1917 galaxies with and integral-field spectroscopy from the ongoing MaNGA survey. For…
Formation of S0s in extreme environments II: the star-formation histories of bulges, discs and lenses
Evelyn J. Johnston, Alfonso Aragón-Salamanca, Amelia Fraser-McKelvie +8
Different processes have been proposed to explain the formation of S0s, including mergers, disc instabilities and quenched spirals. These processes are expected to dominate in diff…
The impact of environment on the lives of disk galaxies as revealed by SDSS-IV MaNGA
Shuang Zhou, Michael Merrifield, Alfonso Aragón-Salamanca +4
Environment has long been known to have significant impact on the evolution of galaxies, but here we seek to quantify the subtler differences that might be found in disk galaxies,…
High-velocity outflows persist up to 1 Gyr after a starburst in recently-quenched galaxies at z > 1
Elizabeth Taylor, David Maltby, Omar Almaini +4
High-velocity outflows are ubiquitous in star-forming galaxies at cosmic noon, but are not as common in passive galaxies at the same epoch. Using optical spectra of galaxies select…
From the Outside Looking in: What can Milky Way Analogues Tell us About the Star Formation Rate of Our Own Galaxy?
Amelia Fraser-McKelvie, Michael Merrifield, Alfonso Aragón-Salamanca
The Milky Way has been described as an anaemic spiral, but is its star formation rate (SFR) unusually low when compared to its peers? To answer this question, we define a sample of…
SDSS-IV MaNGA: Spatially resolved star formation in barred galaxies
Amelia Fraser-McKelvie, Alfonso Aragón-Salamanca, Michael Merrifield +8
Bars inhabit the majority of local-Universe disk galaxies and may be important drivers of galaxy evolution through the redistribution of gas and angular momentum within disks. We i…
The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar and APOGEE-2 Data
Abdurro'uf, Katherine Accetta, Conny Aerts +337
This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete…
Galaxy Zoo: 3D -- Crowd-sourced Bar, Spiral and Foreground Star Masks for MaNGA Target Galaxies
Karen L. Masters, Coleman Krawczyk, Shoaib Shamsi +15
The challenge of consistent identification of internal structure in galaxies - in particular disc galaxy components like spiral arms, bars, and bulges - has hindered our ability to…
SDSS-IV MaNGA: the "G-dwarf problem" revisited
Michael J. Greener, Michael Merrifield, Alfonso Aragón-Salamanca +3
The levels of heavy elements in stars are the product of enhancement by previous stellar generations, and the distribution of this metallicity among the population contains clues t…
SDSS-IV MaNGA: the chemical co-evolution of gas and stars in spiral galaxies
Michael J. Greener, Alfonso Aragón-Salamanca, Michael Merrifield +7
We investigate archaeologically how the metallicity in both stellar and gaseous components of spiral galaxies of differing masses evolve with time, using data from the SDSS-IV MaNG…
SDSS-IV MaNGA: The link between bars and the early cessation of star formation in spiral galaxies
Amelia Fraser-McKelvie, Michael Merrifield, Alfonso Aragón-Salamanca +9
Bars are common in low-redshift disk galaxies, and hence quantifying their influence on their host is of importance to the field of galaxy evolution. We determine the stellar popul…
Are Milky-Way-like galaxies like the Milky Way? A view from SDSS-IV/MaNGA
Shuang Zhou, Alfonso Aragón-Salamanca, Michael Merrifield +3
In this paper, we place the Milky Way (MW) in the context of similar-looking galaxies in terms of their star-formation and chemical evolution histories. We select a sample of 138 M…
SDSS-IV MaNGA: Excavating the fossil record of stellar populations in spiral galaxies
Thomas Peterken, Michael Merrifield, Alfonso Aragón-Salamanca +5
We perform a "fossil record" analysis for ~800 low-redshift spiral galaxies, using STARLIGHT applied to integral field spectroscopic observations from the SDSS-IV MaNGA survey to o…
SDSS-IV MaStar: Theoretical Atmospheric Parameters for the MaNGA Stellar Library
Lewis Hill, Daniel Thomas, Claudia Maraston +16
We calculate the fundamental stellar parameters effective temperature, surface gravity and iron abundance - T, log g, [Fe/H] - for the final release of the Mapping Near…
Where have all the low-metallicity galaxies gone? Tracing evolution in the mass--metallicity plane since a redshift of 0.7
Shuang Zhou, Alfonso Aragón-Salamanca, Michael Merrifield +1
Even over relatively recent epochs, galaxies have evolved significantly in their location in the mass-metallicity plane, which must be telling us something about the latter stages…
A direct test of density wave theory in a grand-design spiral galaxy
Thomas Peterken, Michael Merrifield, Alfonso Aragon-Salamanca +5
The exact nature of the arms of spiral galaxies is still an open question. It has been widely assumed that spiral arms in galaxies with two distinct symmetrical arms are the produc…
Chromodynamical Analysis of Lenticular Galaxies using Globular Clusters and Planetary Nebulae
Emilio J. B. Zanatta, Arianna Cortesi, Ana L. Chies-Santos +7
Recovering the origins of lenticular galaxies can shed light on the understanding of galaxy formation and evolution, since they present properties that can be found in both ellipti…
Kinematically cold and warm planetary nebulae samples, HII regions and supernovae remnants in the disc of the face-on spiral galaxy NGC 628 (M74) -- The Planetary Nebulae Spectrograph with the H arm
Magda Arnaboldi, Ortwin Gerhard, Surya Aniyan +14
We present the results for the galaxy NGC 628 observed with the Planetary Nebulae Spectrograph (PN.S) equipped with the H arm. With the third PN.S arm, the H arm, we measur…
Size, shade or shape? The contribution of galaxies of different types to the star-formation history of the Universe from SDSS-IV MaNGA
Thomas Peterken, Alfonso Aragón-Salamanca, Michael Merrifield +7
By fitting stellar populations to SDSS-IV MaNGA survey observations of ~7000 suitably-weighted individual galaxies, we reconstruct the star-formation history of the Universe, which…
Spectroscopic decomposition of the galaxy and halo of the cD galaxy NGC 3311
Evelyn J. Johnston, Michael Merrifield, Alfonso Aragon-Salamanca
Information on the star-formation histories of cD galaxies and their extended stellar haloes lie in their spectra. Therefore, to determine whether these structures evolved together…
The growth of the central region by acquisition of counter-rotating gas in star-forming galaxies
Yan-Mei Chen, Yong Shi, Christy A. Tremonti +29
Galaxies grow through both internal and external processes. In about 10% of nearby red galaxies with little star formation, gas and stars are counter-rotating, demonstrating the im…
Semi-analytic spectral fitting: simultaneously modelling the mass accumulation and chemical evolution in MaNGA spiral galaxies
Shuang Zhou, Michael Merrifield, Alfonso Aragon-Salamanca
We develop a novel semi-analytic spectral fitting approach to quantify the star-formation histories (SFHs) and chemical enrichment histories (ChEHs) of individual galaxies. We cons…
An analytical model to kinematically identify thin discs in MaNGA galaxies
Meng Yang, Anne-Marie Weijmans, Matthew A. Bershady +3
We present an analytical model to identify thin discs in galaxies, and apply this model to a sample of SDSS MaNGA galaxies. This model fits the velocity and velocity dispersion fie…
The dynamics of S0 galaxies and their Tully-Fisher relation
Anne Mathieu, Michael Merrifield, Konrad Kuijken
This paper investigates the detailed dynamical properties of a relatively homogeneous sample of disc-dominated S0 galaxies, with a view to understanding their formation, evolution…
Photometric Signature of Ultra-Harmonic Resonances in Barred Galaxies
Dhanesh Krishnarao, Zachary J. Pace, Elena D'Onghia +11
Bars may induce morphological features, such as rings, through their resonances. Previous studies suggested that the presence of 'dark-gaps', or regions of a galaxy where the diffe…
SDSS-IV MaNGA: Stellar Population Gradients Within Barred Galaxies
Amelia Fraser-McKelvie, Michael Merrifield, Alfonso Aragón-Salamanca +11
Bars in galaxies are thought to stimulate both inflow of material and radial mixing along them. Observational evidence for this mixing has been inconclusive so far however, limitin…
Untangling galaxy components: full spectral bulge-disc decomposition
Martha Tabor, Michael Merrifield, Alfonso Aragón-Salamanca +3
To ascertain whether photometric decompositions of galaxies into bulges and disks are astrophysically meaningful, we have developed a new technique to decompose spectral data cubes…
Gravitational redshift profiles of MaNGA BCGs
Hongyu Zhu, Shadab Alam, Rupert A. C. Croft +4
The gravitational potential well of an galaxy will lead to a gravitational redshift differential of order 1 km/s between the galaxy core and its outskirts. Cu…
SDSS IV MaNGA: Full spectroscopic bulge-disc decomposition of MaNGA early-type galaxies
Martha Tabor, Michael Merrifield, Alfonso Aragon-Salamanca +5
By applying spectroscopic decomposition methods to a sample of MaNGA early-type galaxies, we separate out spatially and kinematically distinct stellar populations, allowing us to e…
SDSS-IV MaNGA: The Formation Sequence of S0 Galaxies
Amelia Fraser-McKelvie, Alfonso Aragón-Salamanca, Michael Merrifield +5
Gas stripping of spiral galaxies or mergers are thought to be the formation mechanisms of lenticular galaxies. In order to determine the conditions in which each scenario dominates…
Formation of S0s in extreme environments I: clues from kinematics and stellar populations
Lodovico Coccato, Yara L. Jaffé, Arianna Cortesi +8
Despite numerous efforts, it is still unclear whether lenticular galaxies (S0s) evolve from spirals whose star formation was suppressed, or formed trough mergers or disk instabilit…
Time-slicing spiral galaxies with SDSS-IV MaNGA
Thomas Peterken, Amelia Fraser-McKelvie, Alfonso Aragón-Salamanca +6
Spectra of galaxies contain a wealth of information about the stellar populations from which they are made. With integral-field unit (IFU) surveys, such data can be used to map out…