A catalog of planetary nebula candidates in the Sculptor spiral galaxy NGC300⋆, ⋆ ⋆
Aims. [O III] 5007 Å on-band and off-band images, obtained with the Very Large Telescope (VLT) and FORS 2 spectrograph in two zones (center and outskirts) of the spiral galaxy NGC 300, are analyzed searching for emission line objects. In particular we search for planetary nebula (PN) candidates to a...
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2012 |
| País: | México |
| Institución: | Instituto Nacional de Astrofísica, Óptica y Electrónica |
| Repositorio: | Repositorio Institucional del INAOE |
| Idioma: | inglés |
| OAI Identifier: | oai:inaoe.repositorioinstitucional.mx:1009/1944 |
| Acceso en línea: | http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1944 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/Inspec/Galaxies: individual: NGC 300 info:eu-repo/classification/Inspec/Planetary nebulae: general info:eu-repo/classification/Inspec/HII regions info:eu-repo/classification/Inspec/Galaxies: distances and redshifts info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 |
| Sumario: | Aims. [O III] 5007 Å on-band and off-band images, obtained with the Very Large Telescope (VLT) and FORS 2 spectrograph in two zones (center and outskirts) of the spiral galaxy NGC 300, are analyzed searching for emission line objects. In particular we search for planetary nebula (PN) candidates to analyze their distribution and luminosity properties, to perform follow-up spectroscopy, and to study the planetary nebula luminosity function, PNLF. Methods. In the continuum-subtracted images, a large number of emission line objects were detected. From this sample we selected those objects with stellar appearance and no detectable central star as PN candidates. [O III] 5007 Å instrumental magnitudes were measured and calibrated by using spectrophotometric data from the follow-up spectroscopy. Results. We have identified more than a hundred PN candidates and many compact HII regions. The PN sample is the largest one reported for this galaxy so far. For all the objects we present coordinates, instrumental [Oiii] 5007 magnitudes, and apparent nebular [O III] 5007 fluxes and magnitudes. The [OIII] 5007 observed luminosity function for PNe (PNLF) was calculated for the whole sample and for the central and outskirts samples. The three PNLF are similar within uncertainties. We fit the empirical PNLF to the observed PNLF for all the samples. From our best fit for the whole sample, we derived a maximum value for the apparent magnitudes of m⋆5007 = 22.019± 0.022 and obtained a tentative estimate of the distance modulus m5007–M5007 = 26.29⁺⁰‧¹²₋₀․₂₂ mag, which agrees well with the recent value derived from Cepheid stars. |
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