Liverpool Skyline

Astrophysics Research Institute

Dr Christopher Usher

Dr Christopher Usher

Telephone: 0151 231 2917

Publications

Journal article

Chantereau W, Usher C, Bastian N. 2018. Multiple populations within globular clusters in Early-type galaxies Exploring their effect on stellar initial mass function estimates Monthly Notices of the Royal Astronomical Society, 478 >DOI >Link

Usher C, Pastorello N, Bellstedt S, Alabi A, Cerulo P, Chevalier L, Fraser-McKelvie A, Penny S, Foster C, McDermid RM, Schiavon RP, Villaume A. 2017. The WAGGS project - I. The WiFeS Atlas of Galactic Globular cluster Spectra MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 468 :3828-3849 >DOI >Link

Martocchia S, Bastian N, Usher C, Kozhurina-Platais V, Niederhofer F, Cabrera-Ziri I, Dalessandro E, Hollyhead K, Kacharov N, Lardo C, Larsen S, Mucciarelli A, Platais I, Salaris M, Cordero M, Geisler D, Hilker M, Li C, Mackey D. 2017. The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 468 :3150-3158 >DOI >Link

Forbes DA, Alabi A, Brodie JP, Romanowsky AJ, Strader J, Foster C, Usher C, Spitler L, Bellstedt S, Pastorello N, Villaume A, Wasserman A, Pota V. 2017. The SLUGGS Survey: A Catalog of Over 4000 Globular Cluster Radial Velocities in 27 Nearby Early-type Galaxies ASTRONOMICAL JOURNAL, 153 >DOI >Link

Alabi AB, Forbes DA, Romanowsky AJ, Brodie JP, Strader J, Joachim J, Pota V, Pastorello N, Usher CG, Spitler LR, Jennings ZG, Villaume A, Kartha S. 2016. The SLUGGS survey: the mass distribution in early-type galaxies within five effective radii and beyond Monthly Notices of the Royal Astronomical Society, 460 :3838-3860 >DOI

Forbes DA, Alabi A, Romanowsky AJ, Brodie JP, Strader J, Usher CG, Pota V. 2016. The SLUGGS survey: globular clusters and the dark matter content of early-type galaxies Monthly Notices of the Royal Astronomical Society: Letters, 458 :L44-L48 >DOI

Forbes DA, Romanowsky AJ, Pastorello N, Foster C, Brodie JP, Strader J, Usher C, Pota V. 2016. The SLUGGS survey: the assembly histories of individual early-type galaxies MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 457 :1242-1256 >DOI >Link

Foster C, Pastorello N, Roediger J, Brodie JP, Forbes DA, Kartha SS, Pota V, Romanowsky AJ, Spitler LR, Strader J, Usher C, Arnold JA. 2016. The SLUGGS Survey: stellar kinematics, kinemetry and trends at large radii in 25 early-type galaxies MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 457 :147-171 >DOI >Link

Pota V, Brodie JP, Bridges T, Strader J, Romanowsky AJ, Villaume A, Jennings Z, Faifer FR, Pastorello N, Forbes DA, Campbell A, Usher C, Foster C, Spitler LR, Caldwell N, Forte JC, Norris MA, Zepf SE, Beasley MA, Gebhardt K, Hanes DA, Sharples RM, Arnold JA. 2015. A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 450 :1962-1983 >DOI >Link

Pastorello N, Forbes DA, Usher C, Brodie JP, Romanowsky AJ, Strader J, Spitler LR, Alabi AB, Foster C, Jennings ZG, Kartha SS, Pota V. 2015. The SLUGGS survey: combining stellar and globular cluster metallicities in the outer regions of early-type galaxies MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 451 :2625-2639 >DOI >Link

Alabi AB, Foster C, Forbes DA, Romanowsky AJ, Pastorello N, Brodie JP, Spitler LR, Strader J, Usher C. 2015. The SLUGGS survey: globular cluster kinematics in a 'double sigma' galaxy - NGC 4473 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 452 :2208-2219 >DOI >Link

Cappellari M, Romanowsky AJ, Brodie JP, Forbes DA, Strader J, Foster C, Kartha SS, Pastorello N, Pota V, Spitler LR, Usher C, Arnold JA. 2015. SMALL SCATTER AND NEARLY ISOTHERMAL MASS PROFILES TO FOUR HALF-LIGHT RADII FROM TWO-DIMENSIONAL STELLAR DYNAMICS OF EARLY-TYPE GALAXIES ASTROPHYSICAL JOURNAL LETTERS, 804 >DOI >Link

Usher C, Forbes DA, Brodie JP, Romanowsky AJ, Strader J, Conroy C, Foster C, Pastorello N, Pota V, Arnold JA. 2015. The SLUGGS survey: globular cluster stellar population trends from weak absorption lines in stacked spectra MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 446 :369-390 >DOI >Link

Forbes DA, Pastorello N, Romanowsky AJ, Usher C, Brodie JP, Strader J. 2015. The SLUGGS survey: inferring the formation epochs of metal-poor and metal-rich globular clusters MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 452 :1045-1051 >DOI >Link

Penny SJ, Forbes DA, Strader J, Usher C, Brodie JP, Romanowsky AJ. 2014. Ultracompact dwarfs in the Perseus Cluster: UCD formation via tidal stripping MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 439 :3808-3816 >DOI >Link

Brodie JP, Romanowsky AJ, Strader J, Forbes DA, Foster C, Jennings ZG, Pastorello N, Pota V, Usher C, Blom C, Kader J, Roediger JC, Spitler LR, Villaume A, Arnold JA, Kartha SS, Woodley KA. 2014. THE SAGES LEGACY UNIFYING GLOBULARS AND GALAXIES SURVEY (SLUGGS): SAMPLE DEFINITION, METHODS, AND INITIAL RESULTS ASTROPHYSICAL JOURNAL, 796 >DOI >Link

Arnold JA, Romanowsky AJ, Brodie JP, Forbes DA, Strader J, Spitler LR, Foster C, Blom C, Kartha SS, Pastorello N, Pota V, Usher C, Woodley KA. 2014. THE SLUGGS SURVEY: WIDE-FIELD STELLAR KINEMATICS OF EARLY-TYPE GALAXIES ASTROPHYSICAL JOURNAL, 791 >DOI >Link

Pastorello N, Forbes DA, Foster C, Brodie JP, Usher C, Romanowsky AJ, Strader J, Arnold JA. 2014. The SLUGGS survey: exploring the metallicity gradients of nearby early-type galaxies to large radii MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 442 :1003-1039 >DOI >Link

Forbes DA, Pota V, Usher C, Strader J, Romanowsky AJ, Brodie JP, Arnold JA, Spitler LR. 2013. Filling the gap: a new class of old star cluster? MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 435 :L6-L10 >DOI >Link

Strader J, Seth AC, Forbes DA, Fabbiano G, Romanowsky AJ, Brodie JP, Conroy C, Caldwell N, Pota V, Usher C, Arnold JA. 2013. THE DENSEST GALAXY ASTROPHYSICAL JOURNAL LETTERS, 775 >DOI >Link

Usher C, Forbes DA, Spitler LR, Brodie JP, Romanowsky AJ, Strader J, Woodley KA. 2013. The SLUGGS Survey: wide field imaging of the globular cluster system of NGC 4278 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 436 :1172-1190 >DOI >Link

Pota V, Forbes DA, Romanowsky AJ, Brodie JP, Spitler LR, Strader J, Foster C, Arnold JA, Benson A, Blom C, Hargis JR, Rhode KL, Usher C. 2013. The SLUGGS Survey: kinematics for over 2500 globular clusters in 12 early-type galaxies MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 428 :389-420 >DOI >Link

Brodie JP, Usher C, Conroy C, Strader J, Arnold JA, Forbes DA, Romanowsky AJ. 2012. THE SLUGGS SURVEY: NGC 3115, A CRITICAL TEST CASE FOR METALLICITY BIMODALITY IN GLOBULAR CLUSTER SYSTEMS ASTROPHYSICAL JOURNAL LETTERS, 759 >DOI >Link

Usher C, Forbes DA, Brodie JP, Foster C, Spitler LR, Arnold JA, Romanowsky AJ, Strader J, Pota V. 2012. The SLUGGS survey: calcium triplet-based spectroscopic metallicities for over 900 globular clusters MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 426 :1475-1495 >DOI >Link

Usher C, Pfeffer J, Bastian N, Kruijssen JMD, Crain RA, Reina-Campos M. The origin of the 'blue tilt' of globular cluster populations in the E-MOSAICS simulations Monthly Notices of the Royal Astronomical Society, >Link

Bastian NJ. A high fraction of Be stars in young massive clusters: evidence for a large population of near-critically rotating stars Monthly Notices of the Royal Astronomical Society,

Forbes DA, Sinpetru L, Savorgnan G, Romanowsky AJ, Usher C, Brodie J. The SLUGGS Survey: stellar masses and effective radii of early-type galaxies from Spitzer Space Telescope 3.6$μ$m imaging >DOI >Link

Ellison SL, Prochaska JX, Hennawi J, Lopez S, Benn CR, Usher CG, Wolfe AM, Russell DR. The nature of proximate damped Lyman alpha systems >DOI >Link