X-ray sources population in NGC 1559
We present Chandra observation of the nearby spiral galaxy NGC 1559 to study the X-ray sources population in the galaxy. Based on our analysis, we detect twenty-four X-ray sources in the galaxy, of which six have 0.5–8 keV luminosities exceeding 1039 erg s-1, suggesting that they are possibly ul...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit Universiti Kebangsaan Malaysia
2020
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| Online Access: | http://journalarticle.ukm.my/17354/1/02.pdf http://journalarticle.ukm.my/17354/ https://www.ukm.my/jkukm/si-31-2020/ |
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| Institution: | Universiti Kebangsaan Malaysia |
| Language: | English |
| Summary: | We present Chandra observation of the nearby spiral galaxy NGC 1559 to study the X-ray sources population in the
galaxy. Based on our analysis, we detect twenty-four X-ray sources in the galaxy, of which six have 0.5–8 keV luminosities
exceeding 1039 erg s-1, suggesting that they are possibly ultra-luminous X-ray source (ULX) candidates. The remaining
eighteen sources have 0.5–8 keV luminosities below this threshold value, suggesting that they are likely to be X-ray binary
candidates. We perform X-ray spectral analysis for the six ULX candidates and found that in general, their properties are
broadly consistent with that found for other ULXs. The number of X-ray sources found in this galaxy is relatively high
as compared to other galaxies with similar star formation rate of ~2.8 M- yr-1. This however could be attributed to the
relatively high number of supernova occurrence (four) in the galaxy observed in the past years. We did not detect any X-ray
nuclear point source in the galaxy, suggesting that NGC 1559 does not host an active galactic nucleus. This is supported by
its HII optical spectral classification and our infrared analysis using WISE. |
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