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The detection of a population of submillimeter-bright, strongly lensed galaxies.

Science 330:6005 (2010) 800-804

Authors:

Mattia Negrello, R Hopwood, G De Zotti, A Cooray, A Verma, J Bock, DT Frayer, MA Gurwell, A Omont, R Neri, H Dannerbauer, LL Leeuw, E Barton, J Cooke, S Kim, E da Cunha, G Rodighiero, P Cox, DG Bonfield, MJ Jarvis, S Serjeant, RJ Ivison, S Dye, I Aretxaga, DH Hughes, E Ibar, F Bertoldi, I Valtchanov, S Eales, L Dunne, SP Driver, R Auld, S Buttiglione, A Cava, CA Grady, DL Clements, A Dariush, J Fritz, D Hill, JB Hornbeck, L Kelvin, G Lagache, M Lopez-Caniego, J Gonzalez-Nuevo, S Maddox, E Pascale, M Pohlen, EE Rigby, A Robotham, C Simpson, DJB Smith, P Temi, MA Thompson, BE Woodgate, DG York, JE Aguirre, A Beelen, A Blain, AJ Baker, M Birkinshaw, R Blundell, CM Bradford, D Burgarella, L Danese, JS Dunlop, S Fleuren, J Glenn, AI Harris, J Kamenetzky, RE Lupu, RJ Maddalena, BF Madore, PR Maloney, H Matsuhara, MJ Michaowski, EJ Murphy, BJ Naylor, H Nguyen, C Popescu, S Rawlings, D Rigopoulou, D Scott, KS Scott, M Seibert, I Smail, RJ Tuffs, JD Vieira, PP van der Werf, J Zmuidzinas

Abstract:

Gravitational lensing is a powerful astrophysical and cosmological probe and is particularly valuable at submillimeter wavelengths for the study of the statistical and individual properties of dusty star-forming galaxies. However, the identification of gravitational lenses is often time-intensive, involving the sifting of large volumes of imaging or spectroscopic data to find few candidates. We used early data from the Herschel Astrophysical Terahertz Large Area Survey to demonstrate that wide-area submillimeter surveys can simply and easily detect strong gravitational lensing events, with close to 100% efficiency.
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The detection of a population of submillimeter-bright, strongly lensed galaxies

Science 330:6005 (2010) 800-804

Authors:

M Negrello, R Hopwood, G De Zotti, A Cooray, A Verma, J Bock, DT Frayer, MA Gurwell, A Omont, R Neri, H Dannerbauer, LL Leeuw, E Barton, J Cooke, S Kim, E Da Cunha, G Rodighiero, P Cox, DG Bonfield, MJ Jarvis, S Serjeant, RJ Ivison, S Dye, I Aretxaga, DH Hughes, E Ibar, F Bertoldi, I Valtchanov, S Eales, L Dunne, SP Driver, R Auld, S Buttiglione, A Cava, CA Grady, DL Clements, A Dariush, J Fritz, D Hill, JB Hornbeck, L Kelvin, G Lagache, M Lopez-Caniego, J Gonzalez-Nuevo, S Maddox, E Pascale, M Pohlen, EE Rigby, A Robotham, C Simpson, DJB Smith, P Temi, MA Thompson, BE Woodgate, DG York, JE Aguirre, A Beelen, A Blain, AJ Baker, M Birkinshaw, R Blundell, CM Bradford, D Burgarella, L Danese, JS Dunlop, S Fleuren, J Glenn, AI Harris, J Kamenetzky, RE Lupu, RJ Maddalena, BF Madore, PR Maloney, H Matsuhara, MJ Michaowski, EJ Murphy, BJ Naylor, H Nguyen, C Popescu, S Rawlings, D Rigopoulou, D Scott, KS Scott, M Seibert, I Smail, RJ Tuffs, JD Vieira, PP Van Der Werf, J Zmuidzinas

Abstract:

Gravitational lensing is a powerful astrophysical and cosmological probe and is particularly valuable at submillimeter wavelengths for the study of the statistical and individual properties of dusty star-forming galaxies. However, the identification of gravitational lenses is often time-intensive, involving the sifting of large volumes of imaging or spectroscopic data to find few candidates. We used early data from the Herschel Astrophysical Terahertz Large Area Survey to demonstrate that wide-area submillimeter surveys can simply and easily detect strong gravitational lensing events, with close to 100% efficiency.
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A decelerating jet observed by the EVN and VLB A in the X-ray transient XTE J1752-223

Monthly Notices of the Royal Astronomical Society: Letters 409:1 (2010)

Authors:

J Yang, C Brocksopp, S Corbel, Z Paragi, T Tzioumis, RP Fender

Abstract:

The recently discovered Galactic X-ray transient XTE J1752-223 entered its first known outburst in 2010, emitting from the X-ray to the radio regimes. Its general X-ray properties were consistent with those of a black hole candidate in various spectral states, when ejection of jet components is expected. To verify this, we carried out very long baseline interferometry (VLBI) observations. The measurements were carried out with the European VLBI Network (EVN) and the Very Long Baseline Array (VLBA) at four epochs in 2010 February. The images at the first three epochs show a moving jet component that is significantly decelerated by the last epoch, when a new jet component appears that is likely to be associated with the receding jet side. The overall picture is consistent with an initially mildly relativistic jet, interacting with the interstellar medium or with swept-up material along the jet. The brightening of the receding ejecta at the final epoch can be well explained by initial Doppler deboosting of the emission in the decelerating jet. © 2010 The Authors. Journal compilation © 2010 RAS.
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Herschel-ATLAS: the far-infrared-radio correlation at z \lt 0.5

\mnras 409 (2010) 92-101-92-101

Authors:

MJ Jarvis, DJB Smith, DG Bonfield, MJ Hardcastle, JT Falder, JA Stevens, RJ Ivison, R Auld, M Baes, IK Baldry, SP Bamford, N Bourne, S Buttiglione, A Cava, A Cooray, A Dariush, G de Zotti, JS Dunlop, L Dunne, S Dye, S Eales, J Fritz, DT Hill, R Hopwood, DH Hughes, E Ibar, DH Jones, L Kelvin, A Lawrence, L Leeuw, J Loveday, SJ Maddox, MJ Micha lowski, M Negrello, P Norberg, M Pohlen, M Prescott, EE Rigby, A Robotham, G Rodighiero, D Scott, R Sharp, P Temi, MA Thompson, P van der Werf, E van Kampen, C Vlahakis, G White
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Herschel -ATLAS: Extragalactic number counts from 250 to 500 microns

Astronomy and Astrophysics 518:4 (2010)

Authors:

DL Clements, E Rigby, S Maddox, L Dunne, A Mortier, C Pearson, A Amblard, R Auld, M Baes, D Bonfield, D Burgarella, S Buttiglione, A Cava, A Cooray, A Dariush, G De Zotti, S Dye, S Eales, D Frayer, J Fritz, JP Gardner, J Gonzalez-Nuevo, D Herranz, E Ibar, R Ivison, MJ Jarvis, G Lagache, L Leeuw, M Lopez-Caniego, M Negrello, E Pascale, M Pohlen, G Rodighiero, S Samui, S Serjeant, B Sibthorpe, D Scott, DJB Smith, P Temi, M Thompson, I Valtchanov, P Van Der Werf, A Verma

Abstract:

Aims. The Herschel-ATLAS survey (H-ATLAS) will be the largest area survey to be undertaken by the Herschel Space Observatory. It will cover 550 sq. deg. of extragalactic sky at wavelengths of 100, 160, 250, 350 and 500 μm when completed, reaching flux limits (5σ) from 32 to 145 mJy. We here present galaxy number counts obtained for SPIRE observations of the first ∼14 sq. deg. observed at 250, 350 and 500 μm. Methods. Number counts are a fundamental tool in constraining models of galaxy evolution. We use source catalogs extracted from the H-ATLAS maps as the basis for such an analysis. Correction factors for completeness and flux boosting are derived by applying our extraction method to model catalogs and then applied to the raw observational counts. Results. We find a steep rise in the number counts at flux levels of 100-200 mJy in all three SPIRE bands, consistent with results from BLAST. The counts are compared to a range of galaxy evolution models. None of the current models is an ideal fit to the data but all ascribe the steep rise to a population of luminous, rapidly evolving dusty galaxies at moderate to high redshift. © 2010 ESO.