Por favor, use este identificador para citar o enlazar este ítem:
http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1519| Submillimeter array identification of the millimeter-selected galaxy SSA22-AzTEC1: a protoquasar in a protocluster? | |
| David Hughes | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Galaxies: formation Galaxies: starburst Infrared: galaxies Quasars: general Submillimeter: galaxies X-rays: galaxies | |
| We present results from Submillimeter Array (SMA) 860 μm subarcsecond astrometry and multiwavelength observations of the brightest millimeter (S₁․₁ₘₘ = 8.4 mJy) source, SSA22-AzTEC1, found near the core of the SSA22 protocluster that is traced by Lyα-emitting galaxies at z = 3.09. We identify a 860 μm counterpart with a flux density of S₈₆₀ μm = 12.2 ± 2.3 mJy and absolute positional accuracy that is better than 0“.3. At the SMA position, we find radio-to-mid-infrared counterparts, whilst no object is found in Subaru optical and near-infrared deep images at wavelengths ≤1μm (J > 25.4 in AB, 2σ). The photometric redshift estimate, using flux densities at ≥24 μm, indicates zₚₕₒₜ = 3.19⁺⁰˙²⁶₋₀․₃₅, consistent with the protocluster redshift. We then model the near-to-mid-infrared spectral energy distribution (SED) of SSA22-AzTEC1, and find that the SED modeling requires a large extinction (A🇻 ≈ 3.4 mag) of starlight from a stellar component with Mₛₜₐᵣ ∼ 10¹⁰˙⁹M⊙, assuming z = 3.1. Additionally, we find a significant X-ray counterpart with a very hard spectrum (Γeff = −0.34⁺⁰˙⁵⁷₋₀.₆₁), strongly suggesting that SSA22-AzTEC1 harbors a luminous active galactic nuclei (AGNs; L🇽 ≈ 3 × 10⁴⁴ erg s⁻¹) behind a large hydrogen column (N🇭 ∼ 10²⁴ cm⁻²). The AGN, however, is responsible for only ∼10% of the bolometric luminosity of the host galaxy, and therefore the star formation activity likely dominates the submillimeter emission. It is possible that SSA22-AzTEC1 is the first example of a protoquasar growing at the bottom of the gravitational potential underlying the SSA22 protocluster. | |
| The Astrophysical Journal | |
| 01-12-2010 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| Tamura, Y., et al., (2010), Submillimeter array identification of the millimeter-selected galaxy SSA22-AzTEC1: a protoquasar in a protocluster?, The Astrophysical Journal, Vol. 724(2):1270–1282, | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
Cargar archivos:
| Fichero | Tamaño | Formato | |
|---|---|---|---|
| 31.-A.pdf | 1.19 MB | Adobe PDF | Visualizar/Abrir |