On the redshift distribution and physical properties of ACT-selected DSFGs.

Autor: Su T; Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, USA., Marriage TA; Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, USA., Asboth V; Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Rd., Vancouver BC V6T 1Z1, Canada., Baker AJ; Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA., Bond JR; Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON, M5S 3H8, Canada., Crichton D; Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, USA., Devlin MJ; Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104 USA., Dünner R; Departamento de Astronomía y Astrofísica, Pontificía Universidad Católica, Casilla 306, Santiago 22, Chile., Farrah D; Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA., Frayer DT; National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944, USA., Gralla MB; Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, USA.; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.; Department of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA., Hall K; Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, USA., Halpern M; Department of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA., Harris AI; Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA., Hilton M; Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban 4041, South Africa., Hincks AD; Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Rd., Vancouver BC V6T 1Z1, Canada.; Department of Physics, University of Rome 'La Sapienza', Piazzale Aldo Moro 5, I-00185 Rome, Italy., Hughes JP; Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA., Niemack MD; Department of Physics, Cornell University, Ithaca, NY 14853, USA., Page LA; Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, USA., Partridge B; Department of Astronomy, Haverford College, Haverford, PA 19041, USA., Rivera J; Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA., Scott D; Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Rd., Vancouver BC V6T 1Z1, Canada., Sievers JL; Astrophysics and Cosmology Research Unit, School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4041, South Africa., Thornton RJ; Department of Physics, West Chester University, 700 S High St, West Chester, PA 19382, USA., Viero MP; Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA., Wang L; SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD, Groningen, The Netherlands., Wollack EJ; NASA/Goddard Space Flight Center, Greenbelt, MD, 20771, USA., Zemcov M; Center for Detectors, School of Physics and Astronomy, Rochester Institute of Technology, 1 Lomb Memorial Dr., Rochester NY 14623, USA.; Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena CA 91109, USA.
Jazyk: angličtina
Zdroj: Monthly notices of the Royal Astronomical Society [Mon Not R Astron Soc] 2017 Jan; Vol. 464 (1), pp. 968-984. Date of Electronic Publication: 2016 Sep 15.
DOI: 10.1093/mnras/stw2334
Abstrakt: We present multi-wavelength detections of nine candidate gravitationally-lensed dusty star-forming galaxies (DSFGs) selected at 218GHz (1.4mm) from the ACT equatorial survey. Among the brightest ACT sources, these represent the subset of the total ACT sample lying in Herschel SPIRE fields, and all nine of the 218GHz detections were found to have bright Herschel counterparts. By fitting their spectral energy distributions (SEDs) with a modified blackbody model with power-law temperature distribution, we find the sample has a median redshift of z = 4.1 - 1.0 + 1.1 (68 per cent confidence interval), as expected for 218GHz selection, and an apparent total infrared luminosity of log 10 ( μ L IR / L ⊙ ) = 13.86 - 0.30 + 0.33 , which suggests that they are either strongly lensed sources or unresolved collections of unlensed DSFGs. The effective apparent diameter of the sample is μ d = 4.2 - 1.0 + 1.7 kpc , further evidence of strong lensing or multiplicity, since the typical diameter of dusty star-forming galaxies is 1.0-2.5 kpc. We emphasize that the effective apparent diameter derives from SED modelling without the assumption of optically thin dust (as opposed to image morphology). We find that the sources have substantial optical depth. ( τ = 4.2 - 1.9 + 3.7 ) to dust around the peak in the modified blackbody spectrum ( λ obs ⩽ 500 μ m), a result that is robust to model choice.
Databáze: MEDLINE