Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Ryan Urquhart"'
Publikováno v:
Journal of Theoretical and Applied Electronic Commerce Research, Vol 17, Iss 2, Pp 636-651 (2022)
Forecast growth in e-commerce home-delivery demand provides retailers with opportunities for expansion and increased levels of investment. To maximise these growth opportunities, retailers face operational and logistical challenges related to order f
Externí odkaz:
https://doaj.org/article/65a46978989a48a48b6cc8cf22153e58
Autor:
Michael G. Jones, Burçin Mutlu-Pakdil, David J. Sand, Richard Donnerstein, Denija Crnojević, Paul Bennet, Catherine E. Fielder, Ananthan Karunakaran, Kristine Spekkens, Jay Strader, Ryan Urquhart, Dennis Zaritsky
Publikováno v:
The Astrophysical Journal Letters, Vol 957, Iss 1, p L5 (2023)
We report the discovery of Pavo, a faint ( M _V = −10.0), star-forming, irregular, and extremely isolated dwarf galaxy at D ≈ 2 Mpc. Pavo was identified in Dark Energy Camera Legacy Survey imaging via a novel approach that combines low surface br
Externí odkaz:
https://doaj.org/article/31fb2bb928764f07913b4eb51ee1d96b
Autor:
Hang Gong, Ryan Urquhart, Alexandr Vinokurov, Yu Bai, Antonio Cabrera-Lavers, Sergei Fabrika, Liang Wang, Jifeng Liu
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 1, p 24 (2023)
We have conducted long-slit spectroscopic observations and analyzed archival radio data for the ultraluminous X-ray source (ULX) NGC 4861 X-1. Our spectral line analysis unveils NGC 4861 X-1 as the fourth ULX situated within an X-ray photoionized neb
Externí odkaz:
https://doaj.org/article/3622760fbbbe416d9f7a680cc99e9d09
Autor:
Teresa Panurach, Ryan Urquhart, Jay Strader, Laura Chomiuk, Arash Bahramian, Craig O. Heinke, Thomas J. Maccarone, James C. A. Miller-Jones, Gregory R. Sivakoff
Publikováno v:
The Astrophysical Journal, Vol 946, Iss 2, p 88 (2023)
The conditions under which accreting neutron stars launch radio-emitting jets and/or outflows are still poorly understood. The ultracompact X-ray binary X1850–087, located in the globular cluster NGC 6712, is a persistent atoll-type X-ray source th
Externí odkaz:
https://doaj.org/article/ece66629c81d46469c069c9789cf4fee
Publikováno v:
Geographical analysis
The use of location models in retail businesses is well‐established, particularly in the grocery sector. Many alternative methods are in use today but the spatial interaction model (SIM) has a proven record of success. To date, that success relates
Autor:
Teresa Panurach, Jay Strader, Arash Bahramian, Laura Chomiuk, James C. A. Miller-Jones, Craig O. Heinke, Thomas J. Maccarone, Laura Shishkovsky, Gregory R. Sivakoff, Evangelia Tremou, Vlad Tudor, Ryan Urquhart
Publikováno v:
Astrophys.J.
Astrophys.J., 2021, 923 (1), pp.88. ⟨10.3847/1538-4357/ac2c6b⟩
Astrophys.J., 2021, 923 (1), pp.88. ⟨10.3847/1538-4357/ac2c6b⟩
Accreting neutron stars in low-mass X-ray binaries show outflows -- and sometimes jets -- in the general manner of accreting black holes. However, the quantitative link between the accretion flow (traced by X-rays) and outflows and/or jets (traced by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dcf5afc57e466c5013d2dce1d3d3092a
http://arxiv.org/abs/2110.00586
http://arxiv.org/abs/2110.00586
Autor:
Ryan Urquhart, Lauren I. McDermott, Jay Strader, Anil C. Seth, Laura Chomiuk, Nadine Neumayer, Dieu D. Nguyen, Evangelia Tremou
Publikováno v:
The Astrophysical Journal. 940:111
We present new radio and X-ray observations of two nearby ($< 4$ Mpc) low-mass early-type galaxies with dynamically-confirmed central black holes: NGC 5102 and NGC 205. NGC 5102 shows a weak nuclear X-ray source and has no core radio emission. Howeve
Autor:
Laura Chomiuk, Kirill Sokolovsky, Elias Aydi, Ryan Urquhart, Miroslav Filipovic, Jennifer L. Sokoloski, Stuart D. Ryder, Michael Rupen, Koji Mukai, Adam Kawash, Brian D. Metzger, Justin D. Linford, Erik C. Kool, Nirupam Roy, Valério A. R. M. Ribeiro, Amy J. Mioduszewski, Miriam M. Nyamai, Keith W. Bannister, Miriam I. Krauss, T. J. N. Nelson, Jay Strader, Jennifer Weston, T. Finzell
We present radio observations (1--40 GHz) for 36 classical novae, representing data from over five decades compiled from the literature, telescope archives, and our own programs. Our targets display a striking diversity in their optical parameters (e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::92795796bcaae8b899b3b87b47c59733
http://arxiv.org/abs/2107.06251
http://arxiv.org/abs/2107.06251
Autor:
Arash Bahramian, Adam Kawash, Ryan Urquhart, Andrej Udalski, Kirill Sokolovsky, Evangelia Tremou, Jay Strader, Samuel J. Swihart, Laura Chomiuk, Elias Aydi
We report the discovery of a new low-mass X-ray binary near the center of the unassociated Fermi GeV gamma-ray source 4FGL J0540.0-7552. The source shows the persistent presence of an optical accretion disk and exhibits extreme X-ray and optical vari
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b70329a0c0bdb690a795c3678d63064
https://hal.archives-ouvertes.fr/hal-03268944
https://hal.archives-ouvertes.fr/hal-03268944
Autor:
James Miller-Jones, Samuel J. Swihart, Yuankun Wang, Jay Strader, Ryan Urquhart, Vlad Tudor, Evangelia Tremou, Gregory R. Sivakoff, Scott M. Ransom, Arash Bahramian, Laura Shishkovsky, Craig O. Heinke, Thomas J. Maccarone, Laura Chomiuk, Alexandra J. Tetarenko
Publikováno v:
Astrophys.J.
Astrophys.J., 2020, 904 (2), pp.147. ⟨10.3847/1538-4357/abb6fc⟩
Astrophys.J., 2020, 904 (2), pp.147. ⟨10.3847/1538-4357/abb6fc⟩
Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars known among Galactic globular clusters. Here we report new deep $2-8\,$GHz radio continuum observations of Terzan\,5 obtained with the Karl G. Jansky Very La
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1943a85843f0f89e159690af3e1bf33b
http://arxiv.org/abs/2009.07286
http://arxiv.org/abs/2009.07286