Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Bryan N. Dorland"'
Autor:
Adam C. Schneider, Jeffrey A. Munn, Frederick J. Vrba, Justice Bruursema, Scott E. Dahm, Stephen J. Williams, Michael C. Liu, Bryan N. Dorland
Publikováno v:
The Astronomical Journal, Vol 166, Iss 3, p 103 (2023)
We present the positions, proper motions, and near-infrared photometry for 966 known objects with spectral types later than M that were observed as part of the the UKIRT Hemisphere Survey (UHS). We augment the photometry and astrometry from UHS with
Externí odkaz:
https://doaj.org/article/4786891e36054da08b264823e41eff76
Autor:
Adam C. Schneider, Frederick J. Vrba, Jeffrey A. Munn, Scott E. Dahm, Justice Bruursema, Stephen J. Williams, Bryan N. Dorland, Jacqueline K. Faherty, Austin Rothermich, Emily Calamari, Michael C. Cushing, Dan Caselden, Martin Kabatnik, William Pendrill, Arttu Sainio, Nikolaj Stevnbak Andersen, Christopher Tanner
We have used data from the UKIRT Hemisphere Survey (UHS) to search for substellar members of the Hyades cluster. Our search recovered several known substellar Hyades members, and two known brown dwarfs that we suggest may be members based on a new ki
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f999e88fc6cd49274a3ca2358286f847
http://arxiv.org/abs/2203.11090
http://arxiv.org/abs/2203.11090
Autor:
Luis C. Fernandez, Nathan J. Secrest, Megan C. Johnson, Henrique R. Schmitt, Travis C. Fischer, Phillip J. Cigan, Bryan N. Dorland
Using simultaneous Very Long Baseline Array and Neil Gehrels Swift Observatory X-ray Telescope observations of the active galactic nucleus (AGN) in NGC 2992 over a six-month observing campaign, we observed a large drop in core 5 cm radio luminosity,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::acc0d72dad7ec7e73d0507f3f7081c18
Autor:
Onic I. Shuvo, Megan C. Johnson, Nathan J. Secrest, Mario Gliozzi, Travis C. Fischer, Phillip J. Cigan, Luis C. Fernandez, Bryan N. Dorland
Publikováno v:
The Astrophysical Journal. 936:76
We present follow-up results from the first Fundamental Reference AGN Monitoring Experiment (FRAMEx) X-ray/radio snapshot program of a volume-complete sample of local hard X-ray-selected active galactic nuclei (AGNs). Here, we added nine new sources
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17474daba4fb1ed827efd7a3c333a299
https://doi.org/10.3847/1538-4357/ac874a
https://doi.org/10.3847/1538-4357/ac874a
Publikováno v:
The Astrophysical Journal Supplement Series. 260:33
Despite their importance for astrometry and navigation, the active galactic nuclei (AGNs) that comprise the International Celestial Reference Frame (ICRF) are relatively poorly understood, with key information such as their spectroscopic redshifts, A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0cc8a5672fcbd07f8e9ce9292dda35e
https://doi.org/10.3847/1538-4365/ac609f
https://doi.org/10.3847/1538-4365/ac609f
Autor:
Megan Johnson, Norbert Zacharias, Nathan J. Secrest, Lucas Hunt, Henrique R. Schmitt, Travis C. Fischer, Bryan N. Dorland, Michael Koss, Luis C. Fernandez, Phillip J. Cigan
Publikováno v:
The Astrophysical Journal. 906:88
We present the first results from the Fundamental Reference AGN Monitoring Experiment (FRAMEx), an observational campaign dedicated to understanding the physical processes that affect the apparent positions and morphologies of AGNs. In this work, we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b2db4a8d7299882feb351e64ab0098d
https://doi.org/10.3847/1538-4357/abca3c
https://doi.org/10.3847/1538-4357/abca3c
The VLBI USNO 2016A (U16A) solution is part of a work-in-progress effort by USNO towards the preparation of the ICRF3. Most of the astrometric improvement with respect to the ICRF2 is due to the re-observation of the VCS sources. Our objective in thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fdca2cf844b915b805eca602089f0c13
Tidal dissipation of kinetic energy, when it is strong enough, tends to synchronize the rotation of planets and moons with the mean orbital motion, or drive it into long-term stable spin-orbit resonances. As the orbital motion undergoes periodic acce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a889746692a6c5f9bfc47bddfa32a37
http://arxiv.org/abs/1511.06287
http://arxiv.org/abs/1511.06287
Proper motions are computed and collected in a catalog using the Hipparcos positions (epoch 1991.25) and URAT1 positions (epoch 2012.3 to 2014.6). The goal is to obtain a significant improvement on the proper motion accuracy of single stars in the no
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::363a524e75e25f6ecf8e3b0b98354794
http://arxiv.org/abs/1509.05626
http://arxiv.org/abs/1509.05626
Publikováno v:
The Astronomical Journal. 127:1052-1058
We report astrometric measurements of η Carinae's Weigelt blobs C and D (also known as speckle objects C and D) derived from observations with the Hubble Space Telescope Wide Field Planetary Camera 2. Using three epochs of data with a temporal basel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee02e2a3c506c30b6bb2cf39f6ad6f4b
https://doi.org/10.1086/380941
https://doi.org/10.1086/380941