Anomalous Hα Emission Line Profile Detected at the Center of DDO 53
Abstract
We present the detection of a very broad (FWHM = 670 ± 17 km s-1), low-intensity Hα emission line component near the center of DDO 53, a star-forming dwarf irregular galaxy located in the M81 group. The broad component is found at the base of a bright and narrow (FWHM = 38 ± 2 km s-1) component. Using WIYN/Sparsepak optical spectroscopy of the region in addition to multiwavelength archival data, we evaluate the plausibility of several candidate sources, and find that stellar winds from embedded young stars are the most likely origin. However, this result is surprising for such a faint H II region.
- Publication:
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The Astrophysical Journal
- Pub Date:
- October 2021
- DOI:
- Bibcode:
- 2021ApJ...919...73K
- Keywords:
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- Interstellar medium;
- Stellar wind bubbles;
- Dwarf irregular galaxies;
- Wolf-Rayet stars;
- Stellar feedback;
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