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- W2950391036 abstract "Using spectroastrometry, the GRAVITY at The Very Large Telescope Interferometry successfully revealed the structure and kinematics of the broad-line region (BLR) of 3C 273 with an unprecedented high spatial resolution. Spectroastrometry measures the BLR angular sizes of active galactic nuclei (AGNs) whereas reverberation mapping (RM) of AGNs independently provides their linear sizes. In this paper, we suggest a new scheme making a joint analysis of observations of spectroastrometry and RM of AGNs to measure their cosmological distances. We apply this scheme to 3C 273 observed by both the GRAVITY and RM campaign, and find its angular distance of $551.5_{-78.7}^{+97.3}$ Mpc (with an averaged accuracy of $15%$). The advantages of the scheme rest on the feasibility of directly measuring cosmological distances without the invoking of otherwise calibrations through known cosmic ladders. Moreover, we can easily repeat measurements of selected AGNs to efficiently reduce the statistic and possible systematic measurement uncertainties. With RM campaigns, a GRAVITY-sample with a reasonable size ($sim 25$ AGNs) will provide accurate measurements of distances of the AGNs and hence a new way of measuring the Hubble constant with high precision ($lesssim 3%$) for cosmology." @default.
- W2950391036 created "2019-06-27" @default.
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- W2950391036 date "2019-06-20" @default.
- W2950391036 modified "2023-10-17" @default.
- W2950391036 title "Measuring cosmological distances of active galactic nuclei from spectroastrometry and reverberation mapping: application to 3C 273" @default.
- W2950391036 hasPublicationYear "2019" @default.
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