Zobrazeno 1 - 10
of 73
pro vyhledávání: '"Christopher A Onken"'
Autor:
Misty C. Bentz, Madison Markham, Sara Rosborough, Christopher A. Onken, Rachel Street, Monica Valluri, Tommaso Treu
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 1, p 25 (2023)
We describe the results of a new reverberation mapping program focused on the nearby Seyfert galaxy NGC 3227. Photometric and spectroscopic monitoring was carried out from 2022 December to 2023 June with the Las Cumbres Observatory network of telesco
Externí odkaz:
https://doaj.org/article/63f2afd015f2408aa248fb3e4e73662b
Autor:
Yang Huang, Timothy C. Beers, Haibo Yuan, Ke-Feng Tan, Wei Wang, Jie Zheng, Chun Li, Young Sun Lee, Hai-Ning Li, Jing-Kun Zhao, Xiang-Xiang Xue, Yujuan Liu, Huawei Zhang, Xue-Ang Sun, Ji Li, Hong-Rui Gu, Christian Wolf, Christopher A. Onken, Jifeng Liu, Zhou Fan, Gang Zhao
Publikováno v:
The Astrophysical Journal, Vol 957, Iss 2, p 65 (2023)
We present precise photometric estimates of stellar parameters, including effective temperature, metallicity, luminosity classification, distance, and stellar age, for nearly 26 million stars using the methodology developed in the first paper of this
Externí odkaz:
https://doaj.org/article/5de56f6438f841df8030381460a4480c
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 1, p 13 (2023)
We present a new constraint on the mass of the black hole in the active S0 galaxy NGC 5273. Due to the proximity of the galaxy at 16.6 ± 2.1 Mpc, we were able to resolve and extract the bulk motions of stars near the central black hole using adaptiv
Externí odkaz:
https://doaj.org/article/7ed5fa00401646b1aabe655f4d4f8e98
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 1, p 29 (2023)
We present the results of a new reverberation mapping campaign for the broad-line active galactic nucleus (AGN) in the edge-on spiral IC 4329A. Monitoring of the optical continuum with V- band photometry and broad emission-line flux variability with
Externí odkaz:
https://doaj.org/article/d4428af9ebab489b8b0fd750c757218a
Autor:
Jiangdan Li, Christopher A Onken, Christian Wolf, Péter Németh, Mike Bessell, Zhenwei Li, Xiaobin Zhang, Jiao Li, Luqian Wang, Lifang Li, Yangping Luo, Hailiang Chen, Kaifan Ji, Xuefei Chen, Zhanwen Han
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 515:3370-3382
Binaries consisting of a hot subdwarf star and an accreting white dwarf (WD) are sources of gravitational wave radiation at low frequencies and possible progenitors of type Ia supernovae if the WD mass is large enough. Here, we report the discovery o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15963dc8d6d7ec7813b2a49143d4d44a
https://doi.org/10.1093/mnras/stac1768
https://doi.org/10.1093/mnras/stac1768
We develop an accretion disc (AD) fitting method, utilising thin and slim disc models and Bayesian inference with the Markov-Chain Monte-Carlo approach, testing it on the most luminous known quasar, SMSS J215728.21-360215.1, at redshift $z=4.692$. Wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5833ec413cc99c393e3ca495750edaf9
http://arxiv.org/abs/2302.10397
http://arxiv.org/abs/2302.10397
We study the relationship between Galactic location ($R, Z$) and photometric activity for 3.6 million M dwarf stars within 1 kpc of the Sun. For this purpose, we identify 906 unique flare events as a proxy for magnetic activity from the SkyMapper Sou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20ca2a0d5b1b12527fb94d2cd20edb30
SkyMapper colours of Seyfert galaxies and changing-look AGN – II. Newly discovered changing-look AGN
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 511:54-70
Changing-look active galactic nuclei (CLAGN) are AGN that change type as their broad emission lines appear or disappear, which is usually accompanied by strong flux changes in their blue featureless continuum. We search for turn-on CLAGN by selecting
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::851f3ccd585f6ac727960ee472604549
https://doi.org/10.1093/mnras/stab3694
https://doi.org/10.1093/mnras/stab3694
We present the results of a new reverberation mapping campaign for the broad-lined active galactic nucleus (AGN) in the edge-on spiral IC4329A. Monitoring of the optical continuum with $V-$band photometry and broad emission-line flux variability with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b7984cd2a9197fe5de9027778caca31
http://arxiv.org/abs/2212.05954
http://arxiv.org/abs/2212.05954
We present a new constraint on the mass of the black hole in the active S0 galaxy NGC 5273. Due to the proximity of the galaxy at $16.6 \pm 2.1$ Mpc, we were able to resolve and extract the bulk motions of stars near the central black hole using AO-a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18eab2bfcf39f7131dd85725bd6526db
http://arxiv.org/abs/2212.02484
http://arxiv.org/abs/2212.02484