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A search for low surface brightness dwarf galaxies in different environments

Roberts, Sarah, Davies, Jonathan Ivor, Sabatini, Sabini ORCID:, Driel, Wim van, O'Neil, Karen, Baes, Maarten, Linder, Suzanne, Smith, Rodney and Evans, Rhodri 2004. A search for low surface brightness dwarf galaxies in different environments. Monthly Notices of the Royal Astronomical Society 352 (2) , pp. 478-492. 10.1111/j.1365-2966.2004.07934.x

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According to the cold dark matter (CDM) hierarchical clustering theory of galaxy and large-scale structure formation, there should be numerous low-mass dark matter haloes present in the Universe today. If these haloes contain sufficient stars, they should be detectable as low-luminosity stellar systems or dwarf galaxies. We have previously described a new detection method for faint low surface brightness objects and we have shown that there are relatively large numbers of very faint dwarf galaxies in the nearby Virgo cluster. In this paper, we present results from a similar survey carried out on the Millennium Galaxy strip, which runs along the celestial equator and samples a very different galaxy environment. We show that the dwarf-to-giant galaxy number ratio along this strip ranges from 0.7 : 1 to, at most, 6 : 1, corresponding to a flat luminosity function (α≈−0.8 to −1.0). This is very different to our value of 20 : 1 for the Virgo cluster. There is no population of low surface brightness dwarf galaxies in the field that have gone undetected by the redshift surveys. This result is exactly opposite to what CDM models predict for the environmental dependence of the dark matter mass function, which is that there are proportionally more small dark matter haloes in lower-density environments.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: surveys; galaxies: clusters: individual: Virgo cluster; galaxies: clusters: individual: Ursa Major; galaxies: dwarf
Publisher: Wiley
ISSN: 0035-8711
Last Modified: 05 Aug 2023 03:17

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