Browsing by Author "Clarkson, William I."

Now showing 1 - 4 of 4
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    Chemically Dissected Rotation Curves of the Galactic Bulge from Main-sequence Proper Motions
    (2018) Clarkson, William I.; Calamida, Annalisa; Sahu, Kailash C.; Brown, Thomas M.; Gennaro, Mario; Avila, Roberto J.; Valenti, Jeff; Debattista, Victor P.; Rich, R. Michael; Minniti, D.; Zoccali, Manuela; Aufdemberge, Emily R.
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    Deep drilling in the time domain with DECam: survey characterization
    (2023) Graham, Melissa L.; Knop, Robert A.; Kennedy, Thomas D.; Nugent, Peter E.; Bellm, Eric; Catelan, Márcio; Patel, Avi; Smotherman, Hayden; Soraisam, Monika; Stetzler, Steven; Aldoroty, Lauren N.; Awbrey, Autumn; Baeza-Villagra, Karina; Bernardinelli, Pedro H.; Federica Bianco, Federica; Brout, Dillon; Clarke, Riley; Clarkson, William I.; Collett, Thomas; Davenport, James R.; Fu, Shenming; Gizis, John E.; Heinze, Ari; Hu, Lei; Jha, Saurabh W.; Jurić, Mario; Kalmbach, J. Bryce; Kim, Alex; Lee, Chien-Hsiu; Lidman, Chris; Magee, Mark; Martínez-Vázquez, Clara E.; Matheson, Thomas; Narayan, Gautham; Palmese, Antonella; Phillips, Christopher A.; Rabus, Markus; Rest, Armin; Rodríguez-Segovia, Nicolás; Street, Rachel; Vivas, A. Katherina; Wang, Lifan; Wolf, Nicholas; Yang, Jiawen
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    Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: A Pioneering Process of Community-focused Experimental Design
    (2022) Bianco, Federica B.; Ivezić, Željko; Jones, R. Lynne; Graham, Melissa L.; Marshall, Phil; Saha, Abhijit; Strauss, Michael A.; Yoachim, Peter; Ribeiro, Tiago; Anguita, Timo; Bauer, A. E.; Bauer, Franz E.; Bellm, Eric C.; Blum, Robert D.; Brandt, William N.; Brough, Sarah; Catelan, Márcio; Clarkson, William I.; Connolly, Andrew J.; Gawiser, Eric; Gizis, John E.; Hložek, Renée; Kaviraj, Sugata; Liu, Charles T.; Lochner, Michelle; Mahabal, Ashish A.; Mandelbaum, Rachel; McGehee, Peregrine; Neilsen, Eric H., Jr.; Olsen, Knut A. G.; Peiris, Hiranya V.; Rhodes, Jason; Richards, Gordon T.; Ridgway, Stephen; Schwamb, Megan E.; Scolnic, Dan; Shemmer, Ohad; Slater, Colin T.; Slosar, Anže; Smartt, Stephen J.; Strader, Jay; Street, Rachel; Trilling, David E.; Verma, Aprajita; Vivas, A. K.; Wechsler, Risa H.; Willman, Beth
    Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science Foundation and the U.S. Department of Energy, designed to conduct a multipurpose 10 yr optical survey of the Southern Hemisphere sky: the Legacy Survey of Space and Time. Significant flexibility in survey strategy remains within the constraints imposed by the core science goals of probing dark energy and dark matter, cataloging the solar system, exploring the transient optical sky, and mapping the Milky Way. The survey's massive data throughput will be transformational for many other astrophysics domains and Rubin's data access policy sets the stage for a huge community of potential users. To ensure that the survey science potential is maximized while serving as broad a community as possible, Rubin Observatory has involved the scientific community at large in the process of setting and refining the details of the observing strategy. The motivation, history, and decision-making process of this strategy optimization are detailed in this paper, giving context to the science-driven proposals and recommendations for the survey strategy included in this Focus Issue....
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    RR Lyrae Stars Belonging to the Candidate Globular Cluster Patchick 99
    (2024) Butler, Evan; Kunder, Andrea; Prudil, Zdenek; Covey, Kevin R.; Ball, Macy; Campos, Carlos; Gollnick, Kaylen; Carvajal, Julio Olivares; Hughes, Joanne; Devine, Kathryn; Johnson, Christian I.; Vivas, A. Katherina; Rich, R. Michael; Joyce, Meridith; Simion, Iulia T.; Marchetti, Tommaso; Koch-Hansen, Andreas J.; Clarkson, William I.; Kuss, Rebekah
    Patchick 99 is a candidate globular cluster located in the direction of the Galactic bulge, with a proper motion almost identical to the field and extreme field star contamination. A recent analysis suggests it is a low-luminosity globular cluster with a population of RR Lyrae stars. We present new spectra of stars in and around Patchick 99, targeting specifically the three RR Lyrae stars associated with the cluster as well as the other RR Lyrae stars in the field. A sample of 53 giant stars selected from proper motions and a position on the color-magnitude diagram are also observed. The three RR Lyrae stars associated with the cluster have similar radial velocities and distances, and two of the targeted giants also have radial velocities in this velocity regime and [Fe/H] metallicities that are slightly more metal-poor than the field. Therefore, if Patchick 99 is a bona fide globular cluster, it would have a radial velocity of -92 +/- 10 km s-1, a distance of 6.7 +/- 0.4 kpc (as determined from the RR Lyrae stars), and an orbit that confines it to the inner bulge.