The black hole masses of extremely luminous radio-WISE selected galaxies
| Autor: | E. R. Ferris, Roberto J. Assef, D. Stern, D. Wylezalek, Nina A. Hatch, Andrew Blain, Amy Kimball, Chao-Wei Tsai, Minjin Kim, Tanio Díaz-Santos, Anna Sajina, Andrea Silva |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Luminous infrared galaxy
Physics Supermassive black hole education.field_of_study 010308 nuclear & particles physics Population Extinction (astronomy) FOS: Physical sciences Balmer series Astronomy and Astrophysics Astrophysics 01 natural sciences Astrophysics - Astrophysics of Galaxies Redshift Galaxy Luminosity symbols.namesake Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences symbols education 010303 astronomy & astrophysics |
| ISSN: | 0035-8711 1365-2966 |
| Popis: | We present near-IR photometry and spectroscopy of 30 extremely luminous radio and mid-IR selected galaxies. With bolometric luminosities exceeding $\sim10^{13}$ $\rm{L_{\odot}}$ and redshifts ranging from $z = 0.880-2.853$, we use VLT instruments X-shooter and ISAAC to investigate this unique population of galaxies. Broad multi-component emission lines are detected in 18 galaxies and we measure the near-IR lines $\rm{H\rm{\beta}}$, $\text{[OIII]}\rm{\lambda}\rm{\lambda}4959,5007$ and $\rm{H\rm{\alpha}}$ in six, 15 and 13 galaxies respectively, with 10 $\rm{Ly\alpha}$ and five CIV lines additionally detected in the UVB arm. We use the broad $\text{[OIII]}\rm{\lambda}5007$ emission lines as a proxy for the bolometric AGN luminosity, and derive lower limits to supermassive black hole masses of $10^{7.9}$-$10^{9.4}$ $\text{M}_{\odot}$ with expectations of corresponding host masses of $10^{10.4}$-$10^{12.0}$ $\text{M}_{\odot}$. We measure $\rm{\lambda}_{Edd}$ > 1 for eight of these sources at a $2\sigma$ 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 $A_{V}$ = 2.68 mag. Due to non-detections and uncertainties in our $\rm{H\rm{\beta}}$ emission line measurements, we simulate a broad $\rm{H\rm{\beta}}$ line of FWHM = 1480 $\rm{kms^{-1}}$ to estimate extinction for all sources with measured $\rm{H\rm{\alpha}}$ emission. We then use this to infer a mean $A_{V}=3.62$ mag, demonstrating the highly-obscured nature of these galaxies, with the consequence of increasing our estimates of black-hole masses by an 0.5 orders of magnitude in the most extreme and obscured cases. Comment: Accepted for publication in MNRAS. 14 pages (+8 page appendix), 11 figures and 9 tables |
| Databáze: | OpenAIRE |
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