Zooniverse

Research group

Research theme

Sub department

About

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.
More details from the publisher
More details
Details from ArXiV

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.
More details from the publisher

The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies

(2010)

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 Michalowski, 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
More details from the publisher

The Sudden Death of the Nearest Quasar

ArXiv 1011.0427 (2010)

Authors:

Kevin Schawinski, Daniel A Evans, Shanil Virani, C Megan Urry, William C Keel, Priyamvada Natarajan, Chris J Lintott, Anna Manning, Paolo Coppi, Sugata Kaviraj, Steven P Bamford, Gyula IG Jozsa, Michael Garrett, Hanny van Arkel, Pamela Gay, Lucy Fortson

Abstract:

Galaxy formation is significantly modulated by energy output from supermassive black holes at the centers of galaxies which grow in highly efficient luminous quasar phases. The timescale on which black holes transition into and out of such phases is, however, unknown. We present the first measurement of the shutdown timescale for an individual quasar using X-ray observations of the nearby galaxy IC 2497, which hosted a luminous quasar no more than 70,000 years ago that is still seen as a light echo in `Hanny's Voorwerp', but whose present-day radiative output is lower by at least 2 and more likely by over 4 orders of magnitude. This extremely rapid shutdown provides new insights into the physics of accretion in supermassive black holes, and may signal a transition of the accretion disk to a radiatively inefficient state.
Details from ArXiV
More details from the publisher

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.