Radio and IRAS observations of two nebulae around WO stars: G2.4+1.4 in the Galaxy and Sandage H II region 3 in IC 1613

Details Radio and IRAS observations of two nebulae around WO stars: G2.4+1.4 in the Galaxy and Sandage H II region 3 in IC 1613 Radio and IRAS observations of two nebulae around WO stars: G2.4+1.4 in the Galaxy and Sandage H II region 3 in IC 1613

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439..637g&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 439, no. 2, p. 637-645

Astronomy and Astrophysics

Astronomy

21

H Ii Regions, Infrared Astronomy, Interstellar Matter, Milky Way Galaxy, Radio Astronomy, Stellar Envelopes, Wolf-Rayet Stars, Data Reduction, Infrared Astronomy Satellite, Infrared Imagery, Radio Observation, Radio Spectra, Very Large Array (Vla)

Scientific paper

We present new Very Large Array (VLA) and IRAS observations of two H II regions around WO stars: G2.4 + 1.4 associated with WR 102 in the Galaxy and the Sandage H II region 3 around the WO star in the Local Group galaxy IC 1613. A radio image of G2.4 + 1.4 was made with a resolution of approximately 0.3 pc using the VLA at 1.49 GHz. The radio source shows a thin filamentary shell of 9 x 10 pc (wind-blown bubble) superposed on a more diffuse H II region of about 13-14 pc; the radio shell extends farther to the N and W than indicated by previous radio observations. The radio morphology is in excellent agreement with the deep H alpha images. The radio source has a thermal spectrum. The mass of the ionized gas in the shell is about 100 solar mass, and that of the diffuse H II region is about 150-170 solar mass. IRAS FRESCO images show a prominent source G2.4 + 1.4 at the IRAS bands. The source at 60 and 100 micrometers agrees in shape and position with the bright part of the optical and radio shell. If we assign the IRAS flux densities to heated dust rather than atomic lines, the mass of inferred gas is in reasonable agreement with the values derived from the 1.49 GHz data. There is a large shell-like IR feature approximately 35 pc in size with G2.4 + 1.4 and WR 102 located at its brightest and hottest edge. A thermal radio source with the flux density approximately 0.6 mJy has been detected from the Sandage H II region 3 around the WO star in IC 1613. With a mean density of 3.3/cubic cm an emission measure of 1.1 x 103 pc cm-6 cm, and a mass of ionized gas of 2.8 x 104 solar mass, this object is similar to many of the low-luminosity H II regions in the Large Magellanic Cloud (LMC). The WO star could be the only source of ionization. IRAS FRESCO images of the galaxy IC 1613 show a giant complex of dust and gas 2-3 kpc in size. This complex includes a region of active star formation with a supernova remnant, all known WR stars, and the majority of the giant H II regions in the galaxy. The southern component of the IR complex encompasses the WO nebula Sandage 3.

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