Kamann, Sebastian

[["dc.bibliographiccitation.artnumber","A149"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","588"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Husser, T.-O."],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Emsellem, Eric"],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Wisotzki, Lutz"],["dc.contributor.author","Wendt, M."],["dc.contributor.author","Krajnovic, Davor"],["dc.contributor.author","Roth, M. M."],["dc.contributor.author","Bacon, Roland"],["dc.contributor.author","Dreizler, Stefan"],["dc.date.accessioned","2018-11-07T10:16:10Z"],["dc.date.available","2018-11-07T10:16:10Z"],["dc.date.issued","2016"],["dc.description.abstract","We present a detailed analysis of the kinematics of the Galactic globular cluster NGC 6397 based on more than similar to 18 000 spectra obtained with the novel integral field spectrograph MUSE. While NGC 6397 is often considered a core collapse cluster, our analysis suggests a flattening of the surface brightness profile at the smallest radii. Although it is among the nearest globular clusters, the low velocity dispersion of NGC 6397 of < 5 km s(-1) imposes heavy demands on the quality of the kinematical data. We show that despite its limited spectral resolution, MUSE reaches an accuracy of 1 km s(-1) in the analysis of stellar spectra. We find slight evidence for a rotational component in the cluster and the velocity dispersion profile that we obtain shows a mild central cusp. To investigate the nature of this feature, we calculate spherical Jeans models and compare these models to our kinematical data. This comparison shows that if a constant mass-to-light ratio is assumed, the addition of an intermediate-mass black hole with a mass of 600 M-circle dot brings the model predictions into agreement with our data, and therefore could be at the origin of the velocity dispersion profile. We further investigate cases with varying mass-to-light ratios and find that a compact dark stellar component can also explain our observations. However, such a component would closely resemble the black hole from the constant mass-to-light ratio models as this component must be confined to the central similar to 5 '' of the cluster and must have a similar mass. Independent constraints on the distribution of stellar remnants in the cluster or kinematic measurements at the highest possible spatial resolution should be able to distinguish the two alternatives."],["dc.identifier.doi","10.1051/0004-6361/201527065"],["dc.identifier.isi","000373207800161"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13437"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40984"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation.issn","1432-0746"],["dc.relation.orgunit","Fakultät für Physik"],["dc.title","MUSE crowded field 3D spectroscopy of over 12 000 stars in the globular cluster NGC 6397"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","A75"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","575"],["dc.contributor.author","Bacon, Roland"],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Richard, Johan"],["dc.contributor.author","Contini, Thierry"],["dc.contributor.author","Drake, A."],["dc.contributor.author","Franx, M."],["dc.contributor.author","Tacchella, S."],["dc.contributor.author","Vernet, J."],["dc.contributor.author","Wisotzki, Lutz"],["dc.contributor.author","Blaizot, J."],["dc.contributor.author","Bouche, N."],["dc.contributor.author","Bouwens, R."],["dc.contributor.author","Cantalupo, S."],["dc.contributor.author","Carollo, C. Marcella"],["dc.contributor.author","Carton, D."],["dc.contributor.author","Caruana, Joseph"],["dc.contributor.author","Clement, B."],["dc.contributor.author","Dreizler, Stefan"],["dc.contributor.author","Epinat, Benoit"],["dc.contributor.author","Guiderdoni, B."],["dc.contributor.author","Herenz, E. C."],["dc.contributor.author","Husser, T.-O."],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Kerutt, J."],["dc.contributor.author","Kollatschny, Wolfram"],["dc.contributor.author","Krajnovic, Davor"],["dc.contributor.author","Lilly, S."],["dc.contributor.author","Martinsson, Thomas"],["dc.contributor.author","Michel-Dansac, L."],["dc.contributor.author","Patricio, V."],["dc.contributor.author","Schaye, J."],["dc.contributor.author","Shirazi, Maryam"],["dc.contributor.author","Soto, K."],["dc.contributor.author","Soucail, G."],["dc.contributor.author","Steinmetz, M."],["dc.contributor.author","Urrutia, Tanya"],["dc.contributor.author","Weilbacher, P."],["dc.contributor.author","de Zeeuw, T."],["dc.date.accessioned","2018-11-07T10:00:22Z"],["dc.date.available","2018-11-07T10:00:22Z"],["dc.date.issued","2015"],["dc.description.abstract","We observed Hubble Deep Field South with the new panoramic integral-field spectrograph MUSE that we built and have just commissioned at the VLT. The data cube resulting from 27 h of integration covers one arcmin(2) field of view at an unprecedented depth with a 1 sigma emission-line surface brightness limit of 1 x 10(-19) erg s(-1) cm(-2) arcsec(-2), and contains similar to 90 000 spectra. We present the combined and calibrated data cube, and we performed a first-pass analysis of the sources detected in the Hubble Deep Field South imaging. We measured the redshifts of 189 sources up to a magnitude I-814 = 29.5, increasing the number of known spectroscopic redshifts in this field by more than an order of magnitude. We also discovered 26 Ly alpha emitting galaxies that are not detected in the HST WFPC2 deep broad-band images. The intermediate spectral resolution of 2.3 angstrom allows us to separate resolved asymmetric Ly alpha emitters, [O II] 3727 emitters, and C III] 1908 emitters, and the broad instantaneous wavelength range of 4500 angstrom helps to identify single emission lines, such as [O III] 5007, H beta, and H alpha, over a very wide redshift range. We also show how the three-dimensional information of MUSE helps to resolve sources that are confused at ground-based image quality. Overall, secure identifications are provided for 83% of the 227 emission line sources detected in the MUSE data cube and for 32% of the 586 sources identified in the HST catalogue. The overall redshift distribution is fairly flat to z = 6.3, with a reduction between z = 1.5 to 2.9, in the well-known redshift desert. The field of view of MUSE also allowed us to detect 17 groups within the field. We checked that the number counts of [O II] 3727 and Ly alpha emitters are roughly consistent with predictions from the literature. Using two examples, we demonstrate that MUSE is able to provide exquisite spatially resolved spectroscopic information on the intermediate-redshift galaxies present in the field. This unique data set can be used for a wide range of follow-up studies. We release the data cube, the associated products, and the source catalogue with redshifts, spectra, and emission-line fluxes."],["dc.identifier.doi","10.1051/0004-6361/201425419"],["dc.identifier.isi","000350249100075"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12400"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37789"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation","info:eu-repo/grantAgreement/EC/FP7/339659/EU//MUSICOS"],["dc.relation","info:eu-repo/grantAgreement/EC/FP7/336736/EU//CALENDS"],["dc.relation.issn","1432-0746"],["dc.relation.orgunit","Fakultät für Physik"],["dc.title","The MUSE 3D view of the Hubble Deep Field South"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","A114"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","582"],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Monreal-Ibero, Ana"],["dc.contributor.author","Kollatschny, Wolfram"],["dc.contributor.author","Ginsburg, Adam"],["dc.contributor.author","McLeod, Anna F."],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Sandin, Christer"],["dc.contributor.author","Palsa, Ralf"],["dc.contributor.author","Wisotzki, Lutz"],["dc.contributor.author","Bacon, Roland"],["dc.contributor.author","Selman, Fernando"],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Caruana, Joseph"],["dc.contributor.author","Kelz, Andreas"],["dc.contributor.author","Martinsson, Thomas"],["dc.contributor.author","Pecontal-Rousset, Arlette"],["dc.contributor.author","Richard, Johan"],["dc.contributor.author","Wendt, Martin"],["dc.date.accessioned","2018-11-07T09:50:33Z"],["dc.date.available","2018-11-07T09:50:33Z"],["dc.date.issued","2015"],["dc.description.abstract","We present a new integral field spectroscopic dataset of the central part of the Orion Nebula (M 42), observed with the MUSE instrument at the ESO VLT. We reduced the data with the public MUSE pipeline. The output products are two FITS cubes with a spatial size of similar to 5'9 x 4'9 (corresponding to similar to 0.76 x 0.63 pc(2)) and a contiguous wavelength coverage of 4595 ... 9366 angstrom, spatially sampled at 0 '.2. We provide two versions with a sampling of 1.25 angstrom and 0.85 angstrom in dispersion direction. Together with variance cubes these files have a size of 75 and 110 GiB on disk. They are the largest integral field mosaics to date in terms of information content. We make them available for use in the community. To validate this dataset, we compare world coordinates, reconstructed magnitudes, velocities, and absolute and relative emission line fluxes to the literature values and find excellent agreement. We derive a 2D map of extinction and present de-reddened flux maps of several individual emission lines and of diagnostic line ratios. We estimate physical properties of the Orion Nebula, using the emission line ratios [N II] and [S III] (for the electron temperature T-e) and [S II] and [Cl III] (for the electron density N-e), and show 2D images of the velocity measured from several bright emission lines."],["dc.identifier.doi","10.1051/0004-6361/201526529"],["dc.identifier.isi","000363538500114"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12401"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35728"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation","info:eu-repo/grantAgreement/EC/FP7/339659/EU//MUSICOS"],["dc.relation.issn","1432-0746"],["dc.relation.orgunit","Fakultät für Physik"],["dc.title","A MUSE map of the central Orion Nebula (M 42)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","A148"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","588"],["dc.contributor.author","Husser, Tim-Oliver"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Dreizler, Stefan"],["dc.contributor.author","Wendt, Martin"],["dc.contributor.author","Wulff, Nina"],["dc.contributor.author","Bacon, Roland"],["dc.contributor.author","Wisotzki, Lutz"],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Roth, Martin M."],["dc.contributor.author","Monreal-Ibero, Ana"],["dc.date.accessioned","2018-11-07T10:16:10Z"],["dc.date.available","2018-11-07T10:16:10Z"],["dc.date.issued","2016"],["dc.description.abstract","Aims. We demonstrate the high multiplex advantage of crowded field 3D spectroscopy with the new integral field spectrograph MUSE by means of a spectroscopic analysis of more than 12 000 individual stars in the globular cluster NGC 6397. Methods. The stars are deblended with a point spread function fitting technique, using a photometric reference catalogue from HST as prior, including relative positions and brightnesses. This catalogue is also used for a first analysis of the extracted spectra, followed by an automatic in-depth analysis via a full-spectrum fitting method based on a large grid of PHOENIX spectra. Results. We analysed the largest sample so far available for a single globular cluster of 18 932 spectra from 12 307 stars in NGC 6397. We derived a mean radial velocity of v(rad) = 17.84 +/- 0.07 km s(-1) and a mean metallicity of [Fe/H] = -2.120 +/- 0.002, with the latter seemingly varying with temperature for stars on the red giant branch (RGB). We determine Teff and [Fe/H] from the spectra, and log g from HST photometry. This is the first very comprehensive Hertzsprung-Russell diagram (HRD) for a globular cluster based on the analysis of several thousands of stellar spectra, ranging from the main sequence to the tip of the RGB. Furthermore, two interesting objects were identified; one is a post-AGB star and the other is a possible millisecond-pulsar companion."],["dc.description.sponsorship","BMBF Verbundforschung (project MUSE-AO) [05A14BAC, 05A14MGA]"],["dc.identifier.doi","10.1051/0004-6361/201526949"],["dc.identifier.isi","000373207800160"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13436"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40983"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation.issn","1432-0746"],["dc.relation.orgunit","Fakultät für Physik"],["dc.title","MUSE crowded field 3D spectroscopy of over 12 000 stars in the globular cluster NGC 6397 I. The first comprehensive HRD of a globular cluster"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","A98"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","587"],["dc.contributor.author","Wisotzki, Lutz"],["dc.contributor.author","Bacon, Roland"],["dc.contributor.author","Blaizot, J."],["dc.contributor.author","Brinchmann, Jarle"],["dc.contributor.author","Herenz, E. C."],["dc.contributor.author","Schaye, J."],["dc.contributor.author","Bouche, N."],["dc.contributor.author","Cantalupo, S."],["dc.contributor.author","Contini, Thierry"],["dc.contributor.author","Carollo, C. Marcella"],["dc.contributor.author","Caruana, Joseph"],["dc.contributor.author","Courbot, J.-B."],["dc.contributor.author","Emsellem, Eric"],["dc.contributor.author","Kamann, Sebastian"],["dc.contributor.author","Kerutt, J."],["dc.contributor.author","Leclercq, F."],["dc.contributor.author","Lilly, S. J."],["dc.contributor.author","Patricio, V."],["dc.contributor.author","Sandin, Christer"],["dc.contributor.author","Steinmetz, M."],["dc.contributor.author","Straka, L. A."],["dc.contributor.author","Urrutia, Tanya"],["dc.contributor.author","Verhamme, A."],["dc.contributor.author","Weilbacher, Peter M."],["dc.contributor.author","Wendt, M."],["dc.date.accessioned","2018-11-07T10:17:12Z"],["dc.date.available","2018-11-07T10:17:12Z"],["dc.date.issued","2016"],["dc.description.abstract","We report the detection of extended Ly alpha emission around individual star-forming galaxies at redshifts z = 3-6 in an ultradeep exposure of the Hubble Deep Field South obtained with MUSE on the ESO-VLT. The data reach a limiting surface brightness (1 sigma) of similar to 1 x 10(-19) erg s(-1) cm(-2) arcsec(-2) in azimuthally averaged radial profiles, an order of magnitude improvement over previous narrowband imaging. Our sample consists of 26 spectroscopically confirmed Ly alpha-emitting, but mostly continuum-faint (m(AB) greater than or similar to 27) galaxies. In most objects the Ly alpha emission is considerably more extended than the UV continuum light. While five of the faintest galaxies in the sample show no significantly detected Ly alpha haloes, the derived upper limits suggest that this is due to insufficient S/N. Ly alpha haloes therefore appear to be ubiquitous even for low-mass (similar to 10(8)-10(9) M-circle dot) star-forming galaxies at z > 3. We decompose the Ly alpha emission of each object into a compact component tracing the UV continuum and an extended halo component, and infer sizes and luminosities of the haloes. The extended Ly alpha emission approximately follows an exponential surface brightness distribution with a scale length of a few kpc. While these haloes are thus quite modest in terms of their absolute sizes, they are larger by a factor of 5-15 than the corresponding rest-frame UV continuum sources as seen by HST. They are also much more extended, by a factor similar to 5, than Ly alpha haloes around low-redshift star-forming galaxies. Between similar to 40% and greater than or similar to 90% of the observed Ly alpha flux comes from the extended halo component, with no obvious correlation of this fraction with either the absolute or the relative size of the Ly alpha halo. Our observations provide direct insights into the spatial distribution of at least partly neutral gas residing in the circumgalactic medium of low to intermediate mass galaxies at z > 3."],["dc.identifier.doi","10.1051/0004-6361/201527384"],["dc.identifier.isi","000371589800109"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13433"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41185"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation","info:eu-repo/grantAgreement/EC/FP7/339659/EU//MUSICOS"],["dc.relation","info:eu-repo/grantAgreement/EC/FP7/278594/EU//GASAROUNDGALAXIES"],["dc.relation","info:eu-repo/grantAgreement/EC/FP7/336736/EU//CALENDS"],["dc.relation.issn","1432-0746"],["dc.relation.orgunit","Fakultät für Physik"],["dc.title","Extended Lyman alpha haloes around individual high-redshift galaxies revealed by MUSE"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]