Extremely-bright submillimeter galaxies beyond the Lupus-I star-forming region

Abstract

We report detections of two candidate distant submillimeter galaxies (SMGs), MM J154506.4$-$344318 and MM J154132.7$-$350320, which are discovered in the AzTEC/ASTE 1.1 mm survey toward the Lupus-I star-forming region. The two objects have 1.1 mm flux densities of 43.9 and 27.1 mJy, and have Herschel/SPIRE counterparts as well. The Submillimeter Array counterpart to the former SMG is identified at 890 $\mu$m and 1.3 mm. Photometric redshift estimates using all available data from the mid-infrared to the radio suggest that the redshifts of the two SMGs are $z_{\mathrm{photo}}\simeq$ 4-5 and 3, respectively. Near-infrared objects are found very close to the SMGs and they are consistent with low-$z$ ellipticals, suggesting that the high apparent luminosities can be attributed to gravitational magnification. The cumulative number counts at $S_{1.1mm}\ge 25$ mJy, combined with other two 1.1-mm brightest sources, are $0.70_{-0.34}^{+0.56}$ deg${}^{-2}$, which is consistent with a model prediction that accounts for flux magnification due to strong gravitational lensing. Unexpectedly, a $z>3$ SMG and a Galactic dense starless core (e.g., a first hydrostatic core) could be similar in the mid-infrared to millimeter spectral energy distributions and spatial structures at least at $\gtrsim 1"$. This indicates that it is necessary to distinguish the two possibilities by means of broad band photometry from the optical to centimeter and spectroscopy to determine the redshift, when a compact object is identified toward Galactic star-forming regions.

arXiv commentAccepted for publication in ApJ. 16 pages, 9 figures, 2 tables

References in corpus (80)

• Stellar population synthesis at the resolution of 2003
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The USNO-B Catalog
• The Spitzer c2d Legacy Results: Star Formation Rates and Efficiencies; Evolution and Lifetimes
• A Redshift Survey of the Submillimeter Galaxy Population
• A Physical Model for the Co-evolution of QSOs and of their Spheroidal Hosts
• Submillimeter Galaxies
• SCUBA: A common-user submillimetre camera operating on the James Clerk Maxwell Telescope
• Dusty Star-Forming Galaxies at High Redshift
• The 10 Meter South Pole Telescope
• The Submillimeter Array
• A Dust-Obscured Massive Maximum-Starburst Galaxy at a Redshift of 6.34
• SCUBA-2: The 10000 pixel bolometer camera on the James Clerk Maxwell Telescope
• A multi-scale multi-frequency deconvolution algorithm for synthesis imaging in radio interferometry
• From Molecular Cores to Planet-forming Disks: A SIRTF Legacy Program
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• Intense Star Formation within Resolved Compact Regions in a Galaxy at z=2.3
• The Mass Distribution of SDSS J1004+4112 Revisited
• An ALMA Survey of Submillimetre Galaxies in the Extended Chandra Deep Field South: The Far-Infrared Properties of SMGs
• SHARC-2 350 Micron Observations of Distant Submillimeter Selected Galaxies
• Extragalactic millimeter-wave sources in South Pole Telescope survey data: source counts, catalog, and statistics for an 87 square-degree field
• HerMES: The SPIRE confusion limit
• ALMA redshifts of millimeter-selected galaxies from the SPT survey: The redshift distribution of dusty star-forming galaxies
• The Intense Starburst HDF850.1 in a Galaxy Overdensity at z=5.2 in the Hubble Deep Field
• The Large APEX Bolometer Camera LABOCA
• An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: High resolution 870um source counts
• Cosmic evolution of submillimeter galaxies and their contribution to stellar mass assembly
• A unified empirical model for infrared galaxy counts based on observed physical evolution of distant galaxies
• Radiation Magnetohydrodynamic Simulations of Protostellar Collapse: Protostellar Core Formation
• AzTEC Millimetre Survey of the COSMOS Field: I. Data Reduction and Source Catalogue
• Gravitational Lens Models Based on Submillimeter Array Imaging of Herschel-selected Strongly Lensed Sub-millimeter Galaxies at z>1.5
• Herschel and SCUBA-2 imaging and spectroscopy of a bright, lensed submillimetre galaxy at z = 2.3
• A Massive Molecular Gas Reservoir in the z=5.3 Submillimeter Galaxy AzTEC-3
• Gas and dust in a submillimeter galaxy at z = 4.24 from the Herschel ATLAS
• HerMES: Candidate Gravitationally Lensed Galaxies and Lensing Statistics at Submillimeter Wavelengths
• Near-Infrared Imaging of Early-Type Galaxies III. The Near-Infrared Fundamental Plane
• The AzTEC mm-Wavelength Camera
• The Properties of the Interstellar Medium within a Star-Forming Galaxy at z=2.3
• The rapid assembly of an elliptical galaxy of 400 billion solar masses at a redshift of 2.3
• Extragalactic millimeter-wave point source catalog, number counts and statistics from 771 square degrees of the SPT-SZ Survey
• A bright z=5.2 lensed submillimeter galaxy in the field of Abell 773: HLSJ091828.6+514223
• Probing the submillimetre number counts at f(850um) < 2mJy
• Deep 1.1 mm-wavelength imaging of the GOODS-South field by AzTEC/ASTE -- II. Redshift distribution and nature of the submillimetre galaxy population
• HerMES: Candidate High-Redshift Galaxies Discovered with Herschel/SPIRE
• The enigmatic core L1451-mm: a first hydrostatic core? or a hidden VeLLO?
• A Comprehensive View of a Strongly Lensed Planck-Associated Submillimeter Galaxy
• A Candidate Detection of the First Hydrostatic Core
• CO J=1-0 spectroscopy of four submillimeter galaxies with the Zpectrometer on the Green Bank Telescope
• Herschel-ATLAS: towards a sample of ~1000 strongly-lensed galaxies
• H2O emission in high-z ultra-luminous infrared galaxies
• The source counts of submillimetre galaxies detected at 1.1 mm
• L1448 IRS2E: A candidate first hydrostatic core
• Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS
• Exposed Long-lifetime First-core: A New Model of First Cores Based on Radiation Hydrodynamics
• Faint End of 1.3 mm Number Counts Revealed by ALMA
• AzTEC/ASTE 1.1-mm Survey of the AKARI Deep Field South: source catalogue and number counts
• Measurements of CO redshifts with Z-Spec for lensed submillimeter galaxies discovered in the H-ATLAS survey
• SPIDER II - The Fundamental Plane of Early-type Galaxies in grizYJHK
• Dynamical Structure of the Molecular Interstellar Medium in an Extremely Bright, Multiply Lensed z~3 Submillimeter Galaxy Discovered with Herschel
• 13CO and C18O emission from a dense gas disk at z=2.3: abundance variations, cosmic rays and the initial conditions for star formation
• The growth of the nuclear black holes in submillimeter galaxies
• Search for Cold Debris Disks around M-dwarfs. II
• Recent star formation in the Lupus clouds as seen by Herschel
• Detection of an ultra-bright submillimeter galaxy in the Subaru/XMM-Newton Deep Field using AzTEC/ASTE
• Properties of Starless and Prestellar Cores in Taurus Revealed by Herschel SPIRE/PACS Imaging
• Deep 1.1 mm-wavelength imaging of the GOODS-S field by AzTEC/ASTE - I. Source catalogue and number counts
• SPT 0538-50: Physical conditions in the ISM of a strongly lensed dusty star-forming galaxy at z=2.8
• Redshift Determination and CO Line Excitation Modeling for the Multiply-Lensed Galaxy HLSW-01
• Ionized nitrogen at high redshift
• Sub-millimetre galaxies in cosmological hydrodynamic simulations: Source number counts and the spatial clustering
• An extended Herschel drop-out source in the center of AS1063, a 'normal' dusty galaxy at z=6.1 or SZ substructures?
• The very bright SCUBA galaxy count: looking for SCUBA galaxies with the Mexican Hat Wavelet
• Discovery of an extremely bright submillimeter galaxy at z=3.93
• A LABOCA survey of submillimeter galaxies behind galaxy clusters
• S0 galaxies in the Coma cluster: Environmental dependence of the S0 offset from the Tully-Fisher relation
• Calculating the transfer function of noise removal by principal component analysis and application to AzTEC observations
• Initial Results from the Nobeyama Molecular Gas Observations of Distant Bright Galaxies
• The dependency of AGN infrared color-selection on source luminosity and obscuration: An observational perspective in CDFS and COSMOS
• Detection of an ultra-bright submillimeter galaxy behind the Small Magellanic Cloud

Cited by in corpus (3)

• FRagmentation and Evolution of dense cores Judged by ALMA (FREJA). I (Overview). Inner $\sim$1000 au structures of prestellar/protostellar cores in Taurus
• ALMA observations of the early stages of substellar formation in the Lupus 1 and 3 molecular clouds
• Hiding behind a curtain of dust: Gas and dust properties of an ultra-luminous strongly-lensed z = 3.75 galaxy behind the Milky Way disk