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A Hubble Space Telescope/NICMOS view of the prototypical giant Hii region NGC604 in M33 |
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| Authors: | Rodolfo H Barbá Jesús Maíz Apellániz Enrique Pérez Mónica Rubio Alberto Bolatto Cecilia Fariña Guillermo Bosch Nolan R Walborn |
| Institution: | 1. Departamento de Física, Universidad de La Serena, Benavente 980, La Serena, Chile 2. ICATE-CONICET, San Juan, Argentina 3. Instituto de Astrofísica de Andalucía-CSIC, Camino bajo de Huétor 50, Granada, Spain 4. Departamento de Astronomía, Universidad de Chile, Santiago, Chile 5. Department of Astronomy and Laboratory for Millimeter-Wave Astronomy, University of Maryland, College Park, MD, 20742, USA 6. Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA, 94720, USA 7. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, La Plata, Argentina 8. Instituto de Astrofísica La Plata, CONICET, La Plata, Argentina 9. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, 21218, USA |
| Abstract: | We present the first high-spatial-resolution near-infrared (NIR) imaging of NGC604, obtained with the NICMOS camera onboard the Hubble Space Telescope (HST). These NICMOS broad-band images reveal new NIR point sources, clusters, and diffuse structures. We find an excellent spatial correlation between the 8.4 GHz radio continuum and the 2.2 μm nebular emission. Moreover, massive young stellar object candidates appear aligned with these radio peaks, reinforcing the idea that those areas are star-forming regions. Three different scaled OB associations are recognized in the NICMOS images. The brightest NIR sources in our images have properties that suggest that they are red supergiant stars, of which one was previously known. This preliminary analysis of the NICMOS images shows the complexity of the stellar content of the NGC604 nebula. |
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