ORCID Profile
0000-0002-3239-4222
Current Organisations
University of Surrey
,
University of Oxford
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Publisher: AIP
Date: 2010
DOI: 10.1063/1.3458512
Publisher: Cambridge University Press (CUP)
Date: 06-2007
DOI: 10.1017/S1743921307014111
Abstract: We examine the dark matter properties of nearby early-type galaxies using planetary nebulae (PNe) as mass probes. We have designed a specialised instrument, the Planetary Nebula Spectrograph (PN.S) operating at the William Herschel telescope, with the purpose of measuring PN velocities with best efficiency. The primary scientific objective of this custom-built instrument is the study of the PN kinematics in 12 ordinary round galaxies. Preliminary results showing a dearth of dark matter in ordinary galaxies (Romanowsky et al . 2003) are now confirmed by the first complete PN.S datasets. On the other hand early-type galaxies with a “regular” dark matter content are starting to be observed among the brighter PN.S target s le, thus confirming a correlation between the global dark-to-luminous mass virial ratio ( f DM = M DM M * ) and the galaxy luminosity and mass.
Publisher: Hindawi Limited
Date: 10-05-2014
DOI: 10.1111/INA.12116
Publisher: EDP Sciences
Date: 05-05-2009
Publisher: Oxford University Press (OUP)
Date: 24-03-2011
Publisher: Wiley
Date: 25-11-2008
Abstract: We use density and temperature profiles obtained from XMM‐Newton observations to derive a potential of NGC 5846 out to 11 R e , thus probing the mass distribution deep into the halo. The inferred circular velocity is significantly higher than the extrapolation of dynamical models implying a halo, more massive than previously thought. Using an I ‐band surfacebrightness profile and a projected velocity dispersion profile consisting of long‐slit kinematic measurements and planetary nebulae (PNe) velocity dispersions, we solve the Jeans equations, assuming a non‐rotating spherical system. The solutions suggest a highly radially anisotropic galaxy outside 0.7 R e with β ∼ 0.75. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Publisher: Oxford University Press (OUP)
Date: 11-04-2009
Publisher: Wiley
Date: 25-11-2008
Abstract: We present first results of a study of the halo kinematics for a s le of early type galaxies using planetary nebulae (PNe) as kinematical tracers. PNe allow to extend up to several effective radii ( R e ) the information from absorption line kinematics (confined to within 1 or 2 R e ), providing valuable information and constraints for merger simulations and galaxy formation models.We find that the specific angular momentum per unit mass has amore complex radial dependence when the halo region is taken into account and that the halo velocity dispersion is related to the total galaxy luminosity, isophotal shape, and number of PNe per unit of luminosity. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Publisher: Oxford University Press (OUP)
Date: 25-11-2010
Publisher: EDP Sciences
Date: 07-2010
Publisher: Oxford University Press (OUP)
Date: 21-02-2009
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Payel Das.