Ultra-Compact High Velocity Clouds In The ALFALFA HI Survey PDF Download
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Author: Elizabeth Ann Kovenz Adams
Publisher:
ISBN:
Category :
Languages : en
Pages : 277
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Author: Elizabeth Ann Kovenz Adams
Publisher:
ISBN:
Category :
Languages : en
Pages : 277
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Author: Nicholas J. Smith
Publisher:
ISBN:
Category : Galaxies
Languages : en
Pages : 0
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Book Description
The Arecibo Legacy Fast ALFA (ALFALFA) survey was a blind neutral hydrogen (HI) survey that scanned 7,000 square degrees of the sky with the Arecibo radio telescope and catalogued more than 30,000 objects. Among those objects are approximately 100 Ultra-Compact High Velocity Clouds (UCHVCs), which are HI clouds that have masses and velocities that suggest that they may reside in low-mass dark matter halos located in or around the Local Group. Crucially, the UCHVCs do not have any known optical counterparts and thus are ideal locations to search for stars associated with as-yet undetected nearby dwarf galaxies. This thesis is a continuation of an optical survey begun by our group. We observed 26 additional UCHVCs with the WIYN 3.5-m telescope, adding to the 23 that were analyzed in Janesh (2018). In addition to analyzing more UCHVCs, I made improvements to the stellar detection pipeline and incorporated additional interactive steps to ensure the accuracy of the results. I also added in a cross-matching routine using data from the Gaia mission and Sloan Digital Sky Survey to remove possible contaminants (e.g., foreground stars, unresolved background galaxies) from our photometry catalog and improve our ability to find genuine stars associated with the HI clouds. From the sample of UCHVCs we analyzed, we identified six dwarf galaxy candidates with absolute V-band magnitudes -2 to -8 and distances between 270 and 870 kpc. We compared the estimated optical properties of our most convincing candidate with predictions from theoretical simulations and a recent census of the Local Group and found them broadly consistent. We also investigated the possibility that one of the UCHVCs is a gas cloud associated with the Galactic globular cluster Pal 3. We identified two stellar overdensities with modest significance at similar distances to Pal 3 and near the HI source, but note that they would imply a much larger gas mass than one would expect to be associated with a globular cluster. Finally, we discussed the future observations and analysis that would be valuable for determining whether the identified stellar overdensities are true dwarf galaxies as well as highlight the dwarf galaxy discoveries expected from the Rubin Observatory.
Author: Vincent de Heij
Publisher:
ISBN:
Category : Hydrogen, Neutral
Languages : en
Pages : 192
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Author: Bärbel Silvia Koribalski
Publisher: Springer Science & Business Media
ISBN: 1402069332
Category : Science
Languages : en
Pages : 375
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Book Description
This timely book presents an overview of the galaxies within the Local Volume, including the Local Group and our closest neighbours, the Andromeda Galaxy and the Magellanic Clouds. Presented here are the latest results from radio, infrared and optical surveys as well as detailed multi-wavelength studies of individual galaxies. The book aims to provide a vibrant forum for presentations and discussions across a broad range of astrophysical topics.
Author: Vincent De Heij
Publisher:
ISBN:
Category : High-velocity clouds (Astrophysics)
Languages : en
Pages : 192
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Author: B. P. Wakker
Publisher:
ISBN:
Category : Clouds
Languages : en
Pages :
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Author: Robert Minchin
Publisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 370
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Book Description
This conference brought together observers and theorists to discuss what we are learning from the current generation of extragalactic neutral hydrogen observations and what prospects lie ahead, with particular emphasis on the exciting prospects for the next 3 to 10 years with the major U.S. facilities.
Author: Stanley Lucas Denny
Publisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 0
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Author: Destry Rose Saul
Publisher:
ISBN:
Category :
Languages : en
Pages :
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We interpret this as evidence that the warm clouds have an ionized component not present with the cold clouds, possibly because they are part of the Galactic fountain.
Author: R. J. Reynolds
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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