Spitzer identifications and classifications of submillimeter galaxies in giant, high-redshift Lyman-alpha emission-line nebulae

Abstract

Using Spitzer Space Telescope IRAC (3.6-8um) and MIPS (24um) imaging, as well as Hubble Space Telescope optical observations, we identify the IRAC counterparts of the luminous power sources residing within the two largest and brightest Lyman-alpha emitting nebulae (LABs) in the SA22 protocluster at z=3.09 (LAB1 and LAB2). These sources are also both submillimeter galaxies (SMGs). From their rest-frame optical/near-infrared colors, we conclude that the SMG in LAB1 is likely to be starburst dominated and heavily obscured (Av~3). In contrast, LAB2 has excess rest-frame ~2um emission (over that expected from starlight) and hosts a hard X-ray source at the proposed location of the SMG, consistent with the presence of an active galactic nucleus (AGN). We conclude that LAB1 and LAB2 appear to have very different energy sources despite having similar Lyman-alpha spatial extents and luminosities, although it remains unclear whether on-going star-formation or periodic AGN heating is responsible for the extended Lyman-alpha emission. We find that the mid-infrared properties of the SMGs lying in LAB1 and LAB2 are similar to those of the wider SMG population, and so it is possible that extended Lyman-alpha haloes are a common feature of SMGs in general.

4 pages, 2 figures, accepted for publication in ApJ Letters. Figure 1 downgraded in quality, higher resolution version available on request. Uses emulateapj

References in corpus (2)

• The Hubble Deep Field North SCUBA Super-map IV - Characterizing submillimetre galaxies using deep Spitzer imaging
• Mid-Infrared Identifications of SCUBA Galaxies in the CUDSS 14-Hour Field with the Spitzer Space Telescope

Cited by in corpus (49)

• Lyman-alpha Cooling Emission from Galaxy Formation
• Lyman Alpha Blobs as an Observational Signature of Cold Accretion Streams into Galaxies
• Detections of Lyman Continuum from Star-forming Galaxies at z~3 Through Subaru/Suprime-Cam Narrow-band Imaging
• Gravity-driven Lyman-alpha blobs from cold streams into galaxies
• Discovery of a Giant Lya Emitter Near the Reionization Epoch
• The Chandra Deep Protocluster Survey: Ly-alpha Blobs are powered by heating, not cooling
• Line Transfer through Clumpy, Large-Scale Outflows: Lyman Alpha Absorption and Halos around Starforming Galaxies
• Quasars Probing Quasars IV: Joint Constraints on the Circumgalactic Medium from Absorption and Emission
• Panoramic Survey of Lyman α Emitters at z=3.1
• Deep HeII and CIV Spectroscopy of a Giant Lyman alpha Nebula: Dense Compact Gas Clumps in the Circumgalactic Medium of a z~2 Quasar
• HerMES: The Rest-Frame UV Emission and A Lensing Model for the z=6.34 Luminous Dusty Starburst Galaxy HFLS3
• The Discovery of a Large Lyman-alpha+HeII Nebula at z~1.67: A Candidate Low Metallicity Region?
• IGM Emission Observations with the Cosmic Web Imager: II. Discovery of Extended, Kinematically-Linked Emission around SSA22 Lyman-alpha Blob 2
• Inflow velocities of cold flows streaming into massive galaxies at high redshifts
• A z = 3 Lyman Alpha Blob Associated with a Damped Lyman Alpha System Proximate to its Background Quasar
• The Formation of the massive galaxies in the SSA22 z=3.1 protocluster
• Spitzer observations of extended Lyman-alpha Clouds in the SSA22 field
• A Deep Narrowband Imaging Search for CIV and He II Emission from Ly$\alpha$ Blobs
• Lyman-alpha blobs: polarization arising from cold accretion
• Nature of Lyman Alpha Blobs: Powered by Extreme Starbursts
• Submillimeter Array Identification of the Millimeter-Selected Galaxy SSA22-AzTEC1: A Protoquasar in a Protocluster?
• High-Resolution Submillimeter Imaging of the Ly-alpha Blob1 in SSA 22
• ALMA observations of Lyman-alpha Blob 1: halo sub-structure illuminated from within
• Sub-millimetre galaxies in cosmological hydrodynamic simulations: Source number counts and the spatial clustering
• Dissecting the Lyman Alpha Emission Halo of LAB1
• Ly$\alpha$ Blobs from Cold Streams Undergoing Kelvin-Helmholtz Instabilities
• Infrared and millimetre-wavelength evidence for cold accretion within a z = 2.83 Lyman-alpha blob
• A Successful Broad-band Survey for Giant Lya Nebulae II: Spectroscopic Confirmation
• A Successful Broad-band Survey for Giant Lya Nebulae I: Survey Design and Candidate Selection
• Lyman Alpha and MgII as Probes of Galaxies and their Environments
• Extended Lyman-alpha emission from interacting galaxies at high redshifts
• A submillimeter galaxy illuminating its circumgalactic medium: Ly-alpha scattering in a cold, clumpy outflow
• Subaru/MOIRCS Near-Infrared Imaging in the Proto-Cluster Region at z=3.1
• The Line Polarization Within a Giant Lyman-alpha Nebula
• Where is the fuzz? Undetected Lyman alpha nebulae around QSOs at z~2.3
• Constraining Dust and Molecular Gas Properties in Lyman Alpha Blobs at z~3
• Revisiting the Gas Kinematics in SSA22 Lyman-$\alpha$ Blob 1 with Radiative Transfer Modeling in a Multiphase, Clumpy Medium
• Spitzer Imaging of Herschel-ATLAS Gravitationally Lensed Submillimeter Sources
• CHORUS. III. Photometric and Spectroscopic Properties of Ly$\alpha$ Blobs at $z=4.9-7.0$
• Where Outflows Meet Inflows: Gas Kinematics in SSA22 Lyman-$\alpha$ Blob 2 Decoded by Advanced Radiative Transfer Modelling
• [OIII] Emission and Gas Kinematics in a Lyman-alpha Blob at z ~ 3.1
• Spectro-polarimetry confirms central powering of a Ly$\alpha$ nebula at z=3.09
• The Environment on few Mpc scales of Infrared Luminous Galaxies at Redshifts z~1
• Obscured star formation in Ly-alpha blobs at z = 3.1
• Multi-wavelength properties of 850-$\mu$m selected sources from the North Ecliptic Pole SCUBA-2 survey
• The average submillimetre properties of Lyman-alpha Blobs at z=3
• Spitzer Imaging of Strongly-Lensed Herschel-Selected Dusty Star Forming Galaxies
• Modelling the Evolution of Ly$\alpha$ Blobs and Ly$\alpha$ Emitters
• Molecular lines studies at redshift greater than 1