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Publications of the Astronomical Society of the Pacific | 1999

The Hii Regions of M33. II. A Photometric Catalog of 1272 Newly Identified Emission Regions

Paul W. Hodge; Jeff Balsley; Ted K. Wyder; Brooke P. Skelton

We have identified a total of 1272 newly recognized emission regions in M33. Combined with the previously cataloged total of 1066 H ii regions and supernova remnants, this brings M33s total to 2338 emission regions. This paper provides photometry of the new objects in Hα, which is combined with data from previous catalogs to produce a global H ii region luminosity function (corrected for incompleteness) that reaches a faint luminosity limit of 2 × 1034 ergs s–1 and shows a broad maximum with a peak frequency at luminosities of 6 × 1035^{35} ergs s–1. We also plot the H ii region size distribution and comment on unusual morphologies.


Publications of the Astronomical Society of the Pacific | 1997

THE LUMINOSITY FUNCTION AND SIZE DISTRIBUTION OF THE H II REGIONS IN M33

Ted K. Wyder; Paul W. Hodge; Brooke P. Skelton

We present Hα fluxes and sizes for most of the H 2 regions in M33 listed in the catalog of Courtes et al. (1987). The observed bright end of the differential luminosity function is approximately a power law with exponent a = -2.40 ± 0.15, while the number counts turn over at an Hα luminosity of approximately 1036.4 erg s-1. After accounting for the effects of incompleteness in our sample, we find that the faint end of the corrected luminosity function remains almost constant instead of turning over. The cumulative size distribution approximately follows an exponential law with scale size D0 = 32 ± 1 pc. We briefly discuss the implications of our results for our understanding of recent high-mass star formation in M3.


Publications of the Astronomical Society of the Pacific | 1999

Emission-Line Properties of the Large Magellanic Cloud Bubble N70

Brooke P. Skelton; William H. Waller; Richard Fredrick Gelderman; L. W. Brown; Bruce E. Woodgate; Adeline Caulet; Robert A. Schommer

We present a spectrophotometric imaging study of the emission bubble N70 (DEM 301) in the Large Magellanic Cloud. N70 is approximately 100 pc in size with a nearly circular shell-like morphology. The nebular emission is powered by an uncertain combination of EUV photons, intense winds, and supernova shock waves from the central population of high-mass stars (the OB association LH 114). We have obtained narrowband images (FWHM ~ 6 A) of N70 in the light of Hα λ6563, [N ii] λ6584, [S ii] λλ6717, 6731, and [O iii] λ5007, along with the corresponding red and green continua. The resulting line fluxes and flux ratios are used to derive ionization rates, nebular densities, volume filling fractions, and excitation indices. The photoionizing luminosity inferred from the embedded stellar population is more than adequate to account for the observed hydrogen ionization rate.We compare the emission-line photometry with that derived from similar imaging of the Orion Nebula and with data collected from the literature on other emission-line regions in the LMC. Compared with the Orion Nebula, N70 shows much higher [S ii]/Hα intensity ratios that increase smoothly with radius—from less than 0.3 near the center to greater than 1.0 toward the outer filamentary shell. The measured intensity ratios in N70 more closely match the range of excitation spanned by giant and supergiant H ii shells and by some of the supernova remnants observed in the LMC. The contending ionization and excitation processes in the interior and outer shell of N70 are evaluated in terms of the available data. EUV photons probably contribute most of the inner nebulas ionization, whereas a combination of photoionization plus collisional ionization and excitation of sulfur atoms by low-velocity shocks seems to best fit the emission-line luminosities and intensity ratios observed in the outer shell. Considerations of the radiative and mechanical energetics that are involved may indicate the need for one or two supernova explosions having occurred during the last ~Myr.


Archive | 2002

An Atlas of Local Group Galaxies

Paul W. Hodge; Brooke P. Skelton; Joy Ashizawa


Archive | 2003

Book Review: An atlas of Local Group galaxies. Astrophysics and Space Science Library, Vol. 221, Dordrecht, Kluwer, XII+418 pp., 2002, ISBN 1-4020-0673-X

Paul W. Hodge; Brooke P. Skelton; Joy Ashizawa


Astrophysics and Space Science | 2003

Book Review: An atlas of local group galaxies / Kluwer Academic, 2002

Paul W. Hodge; Brooke P. Skelton; Joy Ashizawa


Archive | 2002

Table 4b. M33 Emission Regions Identified by Courtès et al. (1987)

Paul W. Hodge; Brooke P. Skelton; Joy Ashizawa


Archive | 2002

M33 Charts 1

Paul W. Hodge; Brooke P. Skelton; Joy Ashizawa


Archive | 2002

Table 1. The Charts

Paul W. Hodge; Brooke P. Skelton; Joy Ashizawa


Archive | 2002

Table 5. IC 1613 Emission Regions

Paul W. Hodge; Brooke P. Skelton; Joy Ashizawa

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Paul W. Hodge

University of Washington

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Ted K. Wyder

University of Washington

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Bruce E. Woodgate

Goddard Space Flight Center

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L. W. Brown

Goddard Space Flight Center

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William H. Waller

Goddard Space Flight Center

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Richard Gelderman

Goddard Space Flight Center

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