Giesers, Benjamin

[["dc.bibliographiccitation.firstpage","4788"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Monthly Notices of the Royal Astronomical Society"],["dc.bibliographiccitation.lastpage","4803"],["dc.bibliographiccitation.volume","507"],["dc.contributor.author","Göttgens, Fabian"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Baumgardt, Holger"],["dc.contributor.author","Dreizler, Stefan"],["dc.contributor.author","Giesers, Benjamin"],["dc.contributor.author","Husser, Tim-Oliver"],["dc.contributor.author","den Brok, Mark"],["dc.contributor.author","Fétick, Romain"],["dc.contributor.author","Krajnovic, Davor"],["dc.contributor.author","Weilbacher, Peter M"],["dc.date.accessioned","2021-12-01T09:23:51Z"],["dc.date.available","2021-12-01T09:23:51Z"],["dc.date.issued","2021"],["dc.description.abstract","ABSTRACT We use spectra observed with the integral-field spectrograph Multi Unit Spectroscopic Explorer (MUSE) to reveal the central kinematics of the Galactic globular cluster Messier 80 (M80, NGC 6093). Using observations obtained with the recently commissioned narrow-field mode of MUSE, we are able to analyse 932 stars in the central 7.5 arcsec by 7.5 arcsec of the cluster for which no useful spectra previously existed. Mean radial velocities of individual stars derived from the spectra are compared to predictions from axisymmetric Jeans models, resulting in radial profiles of the velocity dispersion, the rotation amplitude, and the mass-to-light ratio. The new data allow us to search for an intermediate-mass black hole (IMBH) in the centre of the cluster. Our Jeans model finds two similarly probable solutions around different dynamical cluster centres. The first solution has a centre close to the photometric estimates available in the literature and does not need an IMBH to fit the observed kinematics. The second solution contains a location of the cluster centre that is offset by about 2.4 arcsec from the first one and it needs an IMBH mass of 600^{+1700}_{-1400}~\\text{M}_\\odot {}$. N-body models support the existence of an IMBH in this cluster with a mass of up to 6000 M⊙ in this cluster, although models without an IMBH provide a better fit to the observed surface brightness profile. They further indicate that the cluster has lost nearly all stellar-mass black holes. We further discuss the detection of two potential high-velocity stars with radial velocities of 80–90 $\\text{km}\\, \\text{s}^{-1}$ relative to the cluster mean."],["dc.description.abstract","ABSTRACT We use spectra observed with the integral-field spectrograph Multi Unit Spectroscopic Explorer (MUSE) to reveal the central kinematics of the Galactic globular cluster Messier 80 (M80, NGC 6093). Using observations obtained with the recently commissioned narrow-field mode of MUSE, we are able to analyse 932 stars in the central 7.5 arcsec by 7.5 arcsec of the cluster for which no useful spectra previously existed. Mean radial velocities of individual stars derived from the spectra are compared to predictions from axisymmetric Jeans models, resulting in radial profiles of the velocity dispersion, the rotation amplitude, and the mass-to-light ratio. The new data allow us to search for an intermediate-mass black hole (IMBH) in the centre of the cluster. Our Jeans model finds two similarly probable solutions around different dynamical cluster centres. The first solution has a centre close to the photometric estimates available in the literature and does not need an IMBH to fit the observed kinematics. The second solution contains a location of the cluster centre that is offset by about 2.4 arcsec from the first one and it needs an IMBH mass of 600^{+1700}_{-1400}~\\text{M}_\\odot {}$. N-body models support the existence of an IMBH in this cluster with a mass of up to 6000 M⊙ in this cluster, although models without an IMBH provide a better fit to the observed surface brightness profile. They further indicate that the cluster has lost nearly all stellar-mass black holes. We further discuss the detection of two potential high-velocity stars with radial velocities of 80–90 $\\text{km}\\, \\text{s}^{-1}$ relative to the cluster mean."],["dc.identifier.doi","10.1093/mnras/stab2449"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/94772"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-478"],["dc.relation.eissn","1365-2966"],["dc.relation.issn","0035-8711"],["dc.rights.uri","https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model"],["dc.title","Central kinematics of the Galactic globular cluster M80"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A118"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","631"],["dc.contributor.author","Göttgens, Fabian"],["dc.contributor.author","Husser, Tim-Oliver"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Dreizler, Stefan"],["dc.contributor.author","Giesers, Benjamin"],["dc.contributor.author","Kollatschny, Wolfram"],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Roth, Martin M."],["dc.contributor.author","Wendt, Martin"],["dc.date.accessioned","2020-12-10T18:11:53Z"],["dc.date.available","2020-12-10T18:11:53Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1051/0004-6361/201936485"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74170"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","A stellar census in globular clusters with MUSE: A spectral catalogue of emission-line sources"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A114"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","635"],["dc.contributor.author","Husser, Tim-Oliver"],["dc.contributor.author","Latour, Marilyn"],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Dreizler, Stefan"],["dc.contributor.author","Giesers, Benjamin"],["dc.contributor.author","Göttgens, Fabian"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Roth, Martin M."],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Wendt, Martin"],["dc.date.accessioned","2020-12-10T18:11:53Z"],["dc.date.available","2020-12-10T18:11:53Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/201936508"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74171"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","A stellar census in globular clusters with MUSE"],["dc.title.alternative","Extending the CaT-metallicity relation below the horizontal branch and applying it to multiple populations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A3"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","632"],["dc.contributor.author","Giesers, Benjamin"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Dreizler, Stefan"],["dc.contributor.author","Husser, Tim-Oliver"],["dc.contributor.author","Askar, Abbas"],["dc.contributor.author","Göttgens, Fabian"],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Latour, Marilyn"],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Wendt, Martin"],["dc.contributor.author","Roth, Martin M."],["dc.date.accessioned","2020-04-06T07:44:40Z"],["dc.date.available","2020-04-06T07:44:40Z"],["dc.date.issued","2019-09-09"],["dc.description.abstract","We utilize multi-epoch MUSE spectroscopy to study binaries in the core of NGC 3201. Our sample consists of 3553 stars with 54883 spectra in total comprising 3200 main-sequence stars up to 4 magnitudes below the turn-off. Each star in our sample has between 3 and 63 (with a median of 14) reliable radial velocity (RV) measurements within five years of observations. We introduce a statistical method to determine the probability of a star showing RV variations based on the whole inhomogeneous RV sample. Using HST photometry and an advanced dynamical MOCCA simulation of this specific GC we overcome observational biases that previous spectroscopic studies had to deal with. This allows us to infer a binary frequency in the MUSE FoV and enables us to deduce the underlying true binary frequency of (6.75+-0.72) % in NGC 3201. The comparison of the MUSE observations with the MOCCA simulation suggests a significant fraction of primordial binaries. We can also confirm a radial increase of the binary fraction towards the GC centre due to mass segregation. We discovered that in our sample at least (57.5+-7.9) % of blue straggler stars (BSS) are in a binary system. For the first time in a study of GCs, we were able to fit Keplerian orbits to a significant sample of 95 binaries. We present the binary system properties of eleven BSS and show evidence that two BSS formation scenarios, the mass transfer in binary (or triple) star systems and the coalescence due to binary-binary interactions, are present in our data. We also describe the binary and spectroscopic properties of four sub-subgiant (or red straggler) stars. Furthermore, we discovered two new black hole (BH) candidates with minimum masses (Msini) of (7.68+-0.50) M_sun, (4.4+-2.8) M_sun, and refine the minimum mass estimate on the already published BH to (4.53+-0.21) M_sun. These BHs are consistent with an extensive BH subsystem hosted by NGC 3201."],["dc.identifier.arxiv","1909.04050v1"],["dc.identifier.doi","10.1051/0004-6361/201936203"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/63782"],["dc.relation.issn","0004-6361"],["dc.relation.issn","1432-0746"],["dc.title","A stellar census in globular clusters with MUSE: Binaries in NGC 3201"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A69"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","626"],["dc.contributor.author","Göttgens, Fabian"],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Roth, Martin M."],["dc.contributor.author","Dreizler, Stefan"],["dc.contributor.author","Giesers, Benjamin"],["dc.contributor.author","Husser, Tim-Oliver"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Kollatschny, Wolfram"],["dc.contributor.author","Monreal-Ibero, Ana"],["dc.contributor.author","Schmidt, Kasper B."],["dc.contributor.author","Wendt, Martin"],["dc.contributor.author","Wisotzki, Lutz"],["dc.contributor.author","Bacon, Roland"],["dc.date.accessioned","2020-12-10T18:11:48Z"],["dc.date.available","2020-12-10T18:11:48Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1051/0004-6361/201935221"],["dc.identifier.eissn","1432-0746"],["dc.identifier.issn","0004-6361"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74144"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Discovery of an old nova remnant in the Galactic globular cluster M 22"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]