Výsledky vyhledávání - "Mendez, Roberto H."

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Revised Simulations of the Planetary Nebulae Luminosity Function

Autor: Valenzuela, Lucas M., Méndez, Roberto H., Bertolami, Marcelo M. Miller

We describe a revised procedure for the numerical simulation of planetary nebulae luminosity functions (PNLF), improving on previous work (M\'endez & Soffner 1997). The procedure now is based on new H-burning post-AGB evolutionary tracks (Miller Bert

Externí odkaz: http://arxiv.org/abs/1910.08748

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The Planetary Nebulae Luminosity Function (PNLF): current perspectives

Autor: Mendez, Roberto H.

This paper starts with a brief historical review about the PNLF and its use as a distance indicator. Then the PNLF distances are compared with Surface Brightness Fluctuations (SBF) distances and Tip of the Red Giant Branch (TRGB) distances. A Monte C

Externí odkaz: http://arxiv.org/abs/1610.08625

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A kinematic study of planetary nebulae in the dwarf irregular galaxy IC10

Autor: Gonçalves, Denise R., Teodorescu, Ana M., Alves-Brito, Alan, Méndez, Roberto H., Margini, Laura

We present positions, kinematics, and the planetary nebula luminosity function (PNLF) for 35 planetary nebulae (PNe) in the nearest starburst galaxy IC10 extending out to 3kpc from the galaxy's centre. We take advantage of the deep imaging and spectr

Externí odkaz: http://arxiv.org/abs/1207.4459

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Using NMAGIC to probe the dark matter halo and orbital structure of the X-ray bright, massive elliptical galaxy, NGC 4649

Autor: Das, Payel, Gerhard, Ortwin, Mendez, Roberto H., Teodorescu, Ana M., de Lorenzi, Flavio

We create dynamical models of the massive elliptical galaxy, NGC 4649, using the N-body made-to-measure code, NMAGIC, and kinematic constraints from long-slit and planetary nebula (PN) data. We explore a range of potentials based on previous determin

Externí odkaz: http://arxiv.org/abs/1105.3478

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Dark matter content and internal dynamics of NGC 4697: NMAGIC particle models from slit data and planetary nebulae velocities

Autor: De Lorenzi, Flavio, Gerhard, Ortwin, Saglia, Roberto P., Sambhus, Niranjan, Debattista, Victor P., Pannella, Maurilio, Mendez, Roberto H.

We present a dynamical study of NGC 4697, an almost edge-on, intermediate-luminosity, E4 elliptical galaxy, combining new surface brightness photometry, new as well as published long-slit absorption line kinematic data, and published planetary nebula

Externí odkaz: http://arxiv.org/abs/0802.1726

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Kinematic evidence for different Planetary Nebulae Populations in the elliptical galaxy NGC 4697

Autor: Sambhus, Niranjan, Gerhard, Ortwin, Mendez, Roberto H.

Publikováno v: AIPConf.Proc.804:317-321,2006; Astron.J.131:837-848,2006

We have analysed the magnitudes, kinematics and positions of a complete sample of 320 PNs in the elliptical galaxy NGC 4697. We show (i) that the PNs in NGC 4697 do not constitute a single population that is a fair tracer of the distribution of all s

Externí odkaz: http://arxiv.org/abs/astro-ph/0510499

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Stellar spectroscopy far beyond the Local Group

Autor: Bresolin, Fabio, Kudritzki, Rolf-Peter, Mendez, Roberto H., Przybilla, Norbert

Publikováno v: Astrophys.J.548:L159-L163,2001

Multi-object spectroscopic observations of blue supergiants in NGC 3621, a spiral galaxy at a distance of 6.7 Mpc, carried out with the ESO VLT and FORS are presented. We demonstrate the feasibility of quantitative stellar spectroscopy at distances a

Externí odkaz: http://arxiv.org/abs/astro-ph/0012372

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