| Autor: |
Ferris, E R, Blain, A W, Assef, R J, Hatch, N A, Kimball, A, Kim, M, Sajina, A, Silva, A, Stern, D, Diaz-Santos, T, Tsai, C-W, Wylezalek, D |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; Mar2021, Vol. 502 Issue 1, p1527-1548, 22p |
| Abstrakt: |
We present near-IR photometry and spectroscopy of 30 extremely luminous radio and mid-IR-selected galaxies. With bolometric luminosities exceeding ∼1013 |$\rm {L_{\odot }}$| and redshifts ranging from z = 0.880 to 2.853, we use Very Large Telescope instruments X-shooter and Infrared Spectrometer and Array Camera to investigate this unique population of galaxies. Broad multicomponent emission lines are detected in 18 galaxies and we measure the near-IR lines |$\rm {H\,\rm {\beta }}$| , |$\rm{[O\,{\small III}]}\, \rm {\lambda }\rm {\lambda }4959,5007$| , and |$\rm {H\,\rm {\alpha }}$| in 6, 15, and 13 galaxies, respectively, with 10 |$\rm {Ly\,\alpha }$| and 5 C iv lines additionally detected in the UVB arm. We use the broad |$\rm{[O\,{\small III}]}\, \rm {\lambda }5007$| emission lines as a proxy for the bolometric active galactic nucleus luminosity, and derive lower limits to supermassive black hole masses of 107.9–109.4 M⊙ with expectations of corresponding host masses of 1010.4–1012.0 M⊙. We measure |$\rm {\lambda }_{Edd}$| > 1 for eight of these sources at a 2σ significance. Near-IR photometry and SED fitting are used to compare stellar masses directly. We detect both Balmer lines in five galaxies and use these to infer a mean visual extinction of AV = 2.68 mag. Due to non-detections and uncertainties in our |${\rm H}\, \beta$| emission line measurements, we simulate a broad |${\rm H}\, \beta$| line of FWHM = 1480 |$\rm {kms^{-1}}$| to estimate extinction for all sources with measured |${\rm H}\, \alpha$| emission. We then use this to infer a mean AV = 3.62 mag, demonstrating the highly obscured nature of these galaxies, with the consequence of increasing our estimates of black hole masses by a 0.5 orders of magnitude in the most extreme and obscured cases. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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