Astrophysical Sciences and Technology Colloquium: Are they even galaxies? Extreme mass-to-light ratio, gas-rich systems
Astrophysical Sciences and Technology Colloquium
Are they even galaxies? Extreme mass-to-light ratio, gas-rich systems
Dr. Michael Jones
Post-doctoral Researcher
University of Arizona
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Abstract:
Blind, wide-field radio surveys of neutral hydrogen gas in the local Universe have a history of identifying extreme mass-to-light ratio systems with almost no stars, but significant quantities of cool neutral gas. The properties of some of these systems are so extreme that they beg the question: are they even galaxies? While follow-up observations have generally demonstrated that most of these objects are routine tidal features or high velocity clouds associated with the Milky Way, some are genuinely exceptional objects such as the nearby dwarf galaxy Leo P, the gas-rich stellar system SECCO 1 in the Virgo cluster, and gas-rich ultra-diffuse galaxies in the field. In this talk Dr. Jones will discuss recent findings for this enigmatic class of objects, whether they meet the bar of being "galaxies", possible formation mechanisms, and prospects for future radio surveys over the next 5-10 years.
Speaker Bio:
Dr. Michael Jones is an extragalactic astronomer whose work focuses on gas-rich galaxies in the local Universe. He is currently a post-doctoral researcher working with David Sand and the University of Arizona and was previously a post-doctoral fellow working with Lourdes Verdes-Montenegro at the Institutode Astrofísicade Andalucía in Granada, Spain. He gained his PhD from Cornell University working on the ALFALFA survey, advised by Martha Haynes and Riccardo Giovanelli.
Intended Audience:
All are welcome. Those with interest in the topic.
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