Searching for star formation towards the Eos molecular cloud
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916715979341824 |
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| author | Saxena, Suryansh Haworth, Thomas J. Burkhart, Blakesley Dharmawardena, Thavisha Gillen, Edward Pattle, Kate Karoly, Janik Hamden, Erika |
| author_facet | Saxena, Suryansh Haworth, Thomas J. Burkhart, Blakesley Dharmawardena, Thavisha Gillen, Edward Pattle, Kate Karoly, Janik Hamden, Erika |
| contents | The Eos cloud, recently discovered in the far ultraviolet via H$_2$ fluorescence, is one of the nearest known dark molecular clouds to the Sun, with a distance spanning from $\sim94-136$pc. However, with a mass ($\sim5.5\times10^3$M$_\odot$) just under $40$ per cent that of star forming clouds like Taurus and evidence for net molecular dissociation, its evolutionary and star forming status is uncertain. We use Gaia data to investigate whether there is evidence for a young stellar population that may have formed from the Eos cloud. Comparing isochrones and pre-main sequence evolutionary models there is no clear young stellar population in the region. While there are a small number of $<10$Myr stars, that population is statistically indistinguishable from those in similar search volumes at other Galactic latitudes. We also find no unusual spatial or kinematic clustering toward the Eos cloud over distances $70-150$pc. Overall we conclude that the Eos cloud has most likely not undergone any recent substantial star formation, and further study of the dynamics of the cloud is required to determine whether it will do so in the future. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_17850 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Searching for star formation towards the Eos molecular cloud Saxena, Suryansh Haworth, Thomas J. Burkhart, Blakesley Dharmawardena, Thavisha Gillen, Edward Pattle, Kate Karoly, Janik Hamden, Erika Astrophysics of Galaxies The Eos cloud, recently discovered in the far ultraviolet via H$_2$ fluorescence, is one of the nearest known dark molecular clouds to the Sun, with a distance spanning from $\sim94-136$pc. However, with a mass ($\sim5.5\times10^3$M$_\odot$) just under $40$ per cent that of star forming clouds like Taurus and evidence for net molecular dissociation, its evolutionary and star forming status is uncertain. We use Gaia data to investigate whether there is evidence for a young stellar population that may have formed from the Eos cloud. Comparing isochrones and pre-main sequence evolutionary models there is no clear young stellar population in the region. While there are a small number of $<10$Myr stars, that population is statistically indistinguishable from those in similar search volumes at other Galactic latitudes. We also find no unusual spatial or kinematic clustering toward the Eos cloud over distances $70-150$pc. Overall we conclude that the Eos cloud has most likely not undergone any recent substantial star formation, and further study of the dynamics of the cloud is required to determine whether it will do so in the future. |
| title | Searching for star formation towards the Eos molecular cloud |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.17850 |