Angular diameters, fluxes and extinction of compact planetary nebulae: Further evidence for steeper extinction towards the bulge

P. M E Ruffle, A. A. Zijlstra, J. R. Walsh, M. D. Gray, K. Gesicki, D. Minniti, F. Comeron

Resultado de la investigación: Article

41 Citas (Scopus)

Resumen

We present values for angular diameter, flux and extinction for 70 Galactic planetary nebulae observed using narrow-band filters. Angular diameters are derived using constant emissivity shell and photoionization line emission models. The mean of the results from these two models are presented as our best estimate. Contour plots of 36 fully resolved objects are included and the low-intensity contours often reveal an elliptical structure that is not always apparent from full width at half maximum measurements. Flux densities are determined, and for both Hα and [O III] there is little evidence of any systematic differences between observed and catalogued values. Observed Hα extinction values are determined using observed Hα and catalogued radio fluxes. Hα extinction values are also derived from catalogued Hα and Hβ flux values by means of an R v dependent extinction law. R v is then calculated in terms of observed extinction values and catalogued Hα and Hβ flux values. Comparing observed and catalogue extinction values for a subset of bulge objects, observed values tend to be lower than catalogue values calculated with R v = 3.1. For the same subset we calculate 〈R v〉 = 2.0, confirming that toward the bulge interstellar extinction is steeper than R v = 3.1. For the inner Galaxy, a relation with the higher supernova rate is suggested, and that the low-density warm ionized medium is the site of the anomalous extinction. Low values of extinction are also derived using dust models with a turnover radius of 0.08 μm.

Idioma originalEnglish
Páginas (desde-hasta)796-812
Número de páginas17
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen353
N.º3
DOI
EstadoPublished - 21 sep 2004

Huella dactilar

planetary nebulae
extinction
set theory
catalogs
interstellar extinction
emissivity
supernovae
narrowband
photoionization
flux density
dust
plots
turnover
galaxies
filters
shell
radio
filter
radii
estimates

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Citar esto

Ruffle, P. M E ; Zijlstra, A. A. ; Walsh, J. R. ; Gray, M. D. ; Gesicki, K. ; Minniti, D. ; Comeron, F. / Angular diameters, fluxes and extinction of compact planetary nebulae : Further evidence for steeper extinction towards the bulge. En: Monthly Notices of the Royal Astronomical Society. 2004 ; Vol. 353, N.º 3. pp. 796-812.
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abstract = "We present values for angular diameter, flux and extinction for 70 Galactic planetary nebulae observed using narrow-band filters. Angular diameters are derived using constant emissivity shell and photoionization line emission models. The mean of the results from these two models are presented as our best estimate. Contour plots of 36 fully resolved objects are included and the low-intensity contours often reveal an elliptical structure that is not always apparent from full width at half maximum measurements. Flux densities are determined, and for both Hα and [O III] there is little evidence of any systematic differences between observed and catalogued values. Observed Hα extinction values are determined using observed Hα and catalogued radio fluxes. Hα extinction values are also derived from catalogued Hα and Hβ flux values by means of an R v dependent extinction law. R v is then calculated in terms of observed extinction values and catalogued Hα and Hβ flux values. Comparing observed and catalogue extinction values for a subset of bulge objects, observed values tend to be lower than catalogue values calculated with R v = 3.1. For the same subset we calculate 〈R v〉 = 2.0, confirming that toward the bulge interstellar extinction is steeper than R v = 3.1. For the inner Galaxy, a relation with the higher supernova rate is suggested, and that the low-density warm ionized medium is the site of the anomalous extinction. Low values of extinction are also derived using dust models with a turnover radius of 0.08 μm.",
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Angular diameters, fluxes and extinction of compact planetary nebulae : Further evidence for steeper extinction towards the bulge. / Ruffle, P. M E; Zijlstra, A. A.; Walsh, J. R.; Gray, M. D.; Gesicki, K.; Minniti, D.; Comeron, F.

En: Monthly Notices of the Royal Astronomical Society, Vol. 353, N.º 3, 21.09.2004, p. 796-812.

Resultado de la investigación: Article

TY - JOUR

T1 - Angular diameters, fluxes and extinction of compact planetary nebulae

T2 - Further evidence for steeper extinction towards the bulge

AU - Ruffle, P. M E

AU - Zijlstra, A. A.

AU - Walsh, J. R.

AU - Gray, M. D.

AU - Gesicki, K.

AU - Minniti, D.

AU - Comeron, F.

PY - 2004/9/21

Y1 - 2004/9/21

N2 - We present values for angular diameter, flux and extinction for 70 Galactic planetary nebulae observed using narrow-band filters. Angular diameters are derived using constant emissivity shell and photoionization line emission models. The mean of the results from these two models are presented as our best estimate. Contour plots of 36 fully resolved objects are included and the low-intensity contours often reveal an elliptical structure that is not always apparent from full width at half maximum measurements. Flux densities are determined, and for both Hα and [O III] there is little evidence of any systematic differences between observed and catalogued values. Observed Hα extinction values are determined using observed Hα and catalogued radio fluxes. Hα extinction values are also derived from catalogued Hα and Hβ flux values by means of an R v dependent extinction law. R v is then calculated in terms of observed extinction values and catalogued Hα and Hβ flux values. Comparing observed and catalogue extinction values for a subset of bulge objects, observed values tend to be lower than catalogue values calculated with R v = 3.1. For the same subset we calculate 〈R v〉 = 2.0, confirming that toward the bulge interstellar extinction is steeper than R v = 3.1. For the inner Galaxy, a relation with the higher supernova rate is suggested, and that the low-density warm ionized medium is the site of the anomalous extinction. Low values of extinction are also derived using dust models with a turnover radius of 0.08 μm.

AB - We present values for angular diameter, flux and extinction for 70 Galactic planetary nebulae observed using narrow-band filters. Angular diameters are derived using constant emissivity shell and photoionization line emission models. The mean of the results from these two models are presented as our best estimate. Contour plots of 36 fully resolved objects are included and the low-intensity contours often reveal an elliptical structure that is not always apparent from full width at half maximum measurements. Flux densities are determined, and for both Hα and [O III] there is little evidence of any systematic differences between observed and catalogued values. Observed Hα extinction values are determined using observed Hα and catalogued radio fluxes. Hα extinction values are also derived from catalogued Hα and Hβ flux values by means of an R v dependent extinction law. R v is then calculated in terms of observed extinction values and catalogued Hα and Hβ flux values. Comparing observed and catalogue extinction values for a subset of bulge objects, observed values tend to be lower than catalogue values calculated with R v = 3.1. For the same subset we calculate 〈R v〉 = 2.0, confirming that toward the bulge interstellar extinction is steeper than R v = 3.1. For the inner Galaxy, a relation with the higher supernova rate is suggested, and that the low-density warm ionized medium is the site of the anomalous extinction. Low values of extinction are also derived using dust models with a turnover radius of 0.08 μm.

KW - Dust, extinction

KW - Galaxy: bulge

KW - Galaxy: centre

KW - Planetary nebulae: general

UR - http://www.scopus.com/inward/record.url?scp=4744366839&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2004.08113.x

DO - 10.1111/j.1365-2966.2004.08113.x

M3 - Article

AN - SCOPUS:4744366839

VL - 353

SP - 796

EP - 812

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -