Zobrazeno 1 - 10
of 180
pro vyhledávání: '"BRAATZ, J. A."'
Autor:
Kuo, C. Y., Gao, F., Braatz, J. A., Pesce, D. W., Humphreys, E. M. L., Reid, M. J., Impellizzeri, C. M. V., Henkel, C., Wagner, J., Wu, C. E.
High precision mapping of H2O megamaser emission from active galaxies has revealed more than a dozen Keplerian H2O maser disks, which enable a ~4% uncertainty estimate of the Hubble constant as well as providing accurate masses for the central black
Externí odkaz:
http://arxiv.org/abs/2312.16382
Publikováno v:
A&A 682, A25 (2024)
Masers are a unique tool to investigate the emitting gas in the innermost regions of AGNs and to map accretion disks and tori orbiting around supermassive black holes. IC485, which is classified as a LINER or Seyfert galaxy, hosts a bright water mase
Externí odkaz:
http://arxiv.org/abs/2310.08998
Autor:
Pesce, D. W., Braatz, J. A., Reid, M. J., Riess, A. G., Scolnic, D., Condon, J. J., Gao, F., Henkel, C., Impellizzeri, C. M. V., Kuo, C. Y., Lo, K. Y.
We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser data and obtained better distance estimates for four galaxies previously
Externí odkaz:
http://arxiv.org/abs/2001.09213
Autor:
Pesce, D. W., Braatz, J. A., Reid, M. J., Condon, J. J., Gao, F., Henkel, C., Kuo, C. Y., Lo, K. Y., Zhao, W.
As part of the survey component of the Megamaser Cosmology Project, we have discovered a disk megamaser system in the galaxy CGCG 074-064. Using the GBT and the VLA, we have obtained spectral monitoring observations of this maser system at a monthly
Externí odkaz:
http://arxiv.org/abs/2001.04581
Autor:
Kuo, C. Y., Hsiang, J. Y., Chung, H. H., Constantin, A., Chang, Y. -Y., da Cunha, E., Pesce, D., Chien, W. T., Chen, B. Y., Braatz, J. A., Zaw, Ingyin, Matsushita, S., Lin, J. C.
We present a new investigation of the dependence of H2O maser detection rates and properties on the mid-IR AGN luminosity, L_AGN, and the obscuring column density, N_H, based on mid-IR and hard X-ray photometry. Based on spectral energy distribution
Externí odkaz:
http://arxiv.org/abs/1911.10721
Autor:
Kuo, C. Y., Braatz, J. A., Impellizzeri, C. M. V., Gao, F., Pesce, D., Reid, M. J., Condon, J., Kamali, F., Henkel, C., Greene, J. E.
We present VLBI images and kinematics of water maser emission in three active galaxies: NGC 5728, Mrk 1, and IRAS 08452-0011. IRAS 08452-0011 is a triple-peaked H2O megamaser, consistent with a Keplerian rotating disk, indicating a black hole mass of
Externí odkaz:
http://arxiv.org/abs/1910.14314
Akademický článek
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Autor:
Kamali, F., Henkel, C., Koyama, S., Kuo, C. Y., Condon, J. J., Brunthaler, A., Reid, M. J., Greene, J. E., Menten, K. M., Impellizzeri, C. M. V., Braatz, J. A., Litzinger, E., Kadler, M.
Publikováno v:
A&A 624, A42 (2019)
An essential part of the paradigm describing active galactic nuclei is the alignment between the radio jet and the associated rotation axis of the sub-pc sized accretion disks. Because of the small linear and angular scales involved, this alignment h
Externí odkaz:
http://arxiv.org/abs/1902.05545
We report the result of our search for the 380 GHz H2O line emissions from the quadruply lensed QSO MG J0104+0534 at z = 2.639 with the Atacama Large Millimeter/submillimeter Array (ALMA). Our observation shows a tentative detection of the 380 GHz li
Externí odkaz:
http://arxiv.org/abs/1901.04745
Autor:
Zhao, W., Braatz, J. A., Condon, J. J., Lo, K. Y., Reid, M. J., Henkel, C., Pesce, D. W., Greene, J. E., Gao, F., Kuo, C. Y., Impellizzeri, C. M. V.
We present high resolution (sub-mas) VLBI maps of nuclear H2O megamasers for seven galaxies. In UGC6093, the well-aligned systemic masers and high-velocity masers originate in an edge-on, flat disk and we determine the mass of the central SMBH to be
Externí odkaz:
http://arxiv.org/abs/1801.06332