Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01

We report on the redshift measurement and CO line excitation of HERMES J105751.1+573027 (HLSW-01), a strongly lensed submillimeter galaxy discovered in Herschel/SPIRE observations as part of the Herschel Multi-tiered Extragalactic Survey (HerMES). HLSW-01 is an ultra-luminous galaxy with an intrinsi...

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Main Authors:	Scott, K., Lupu, R., Aguirre, J., Auld, R., Aussel, H., Baker, A., Beelen, A., Bock, J., Bradford, C., Brisbin, D., Burgarella, D., Carpenter, J., Chanial, P., Chapman, S., Clements, D., Conley, A., Cooray, A., Cox, P., Dowell, C., Eales, S., Farrah, D., Franceschini, A., Frayer, D., Gavazzi, R., Glenn, J., Griffin, M., Harris, A., Ibar, E., Ivison, R., Kamenetzky, J., Kim, S., Krips, M., Maloney, P., Matsuhara, H., Mortier, A., Murphy, E., Naylor, B., Neri, R., Nguyen, H., Oliver, S., Omont, A., Page, M., Papageorgiou, A., Pearson, C., Pérez-Fournon, I., Pohlen, M., Rawlings, J., Raymond, G., Riechers, D., Rodighiero, G., Roseboom, I., Rowan-Robinson, M., Scott, D., Seymour, Nick, Smith, A., Symeonidis, M., Tugwell, K., Vaccari, M., Vieira, J., Vigroux, L., Wang, L., Wright, G., Zmuidzinas, J.
Format:	Journal Article
Published:	2011
Online Access:	http://hdl.handle.net/20.500.11937/30591

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author	Scott, K. Lupu, R. Aguirre, J. Auld, R. Aussel, H. Baker, A. Beelen, A. Bock, J. Bradford, C. Brisbin, D. Burgarella, D. Carpenter, J. Chanial, P. Chapman, S. Clements, D. Conley, A. Cooray, A. Cox, P. Dowell, C. Eales, S. Farrah, D. Franceschini, A. Frayer, D. Gavazzi, R. Glenn, J. Griffin, M. Harris, A. Ibar, E. Ivison, R. Kamenetzky, J. Kim, S. Krips, M. Maloney, P. Matsuhara, H. Mortier, A. Murphy, E. Naylor, B. Neri, R. Nguyen, H. Oliver, S. Omont, A. Page, M. Papageorgiou, A. Pearson, C. Pérez-Fournon, I. Pohlen, M. Rawlings, J. Raymond, G. Riechers, D. Rodighiero, G. Roseboom, I. Rowan-Robinson, M. Scott, D. Seymour, Nick Smith, A. Symeonidis, M. Tugwell, K. Vaccari, M. Vieira, J. Vigroux, L. Wang, L. Wright, G. Zmuidzinas, J.
author_facet	Scott, K. Lupu, R. Aguirre, J. Auld, R. Aussel, H. Baker, A. Beelen, A. Bock, J. Bradford, C. Brisbin, D. Burgarella, D. Carpenter, J. Chanial, P. Chapman, S. Clements, D. Conley, A. Cooray, A. Cox, P. Dowell, C. Eales, S. Farrah, D. Franceschini, A. Frayer, D. Gavazzi, R. Glenn, J. Griffin, M. Harris, A. Ibar, E. Ivison, R. Kamenetzky, J. Kim, S. Krips, M. Maloney, P. Matsuhara, H. Mortier, A. Murphy, E. Naylor, B. Neri, R. Nguyen, H. Oliver, S. Omont, A. Page, M. Papageorgiou, A. Pearson, C. Pérez-Fournon, I. Pohlen, M. Rawlings, J. Raymond, G. Riechers, D. Rodighiero, G. Roseboom, I. Rowan-Robinson, M. Scott, D. Seymour, Nick Smith, A. Symeonidis, M. Tugwell, K. Vaccari, M. Vieira, J. Vigroux, L. Wang, L. Wright, G. Zmuidzinas, J.
author_sort	Scott, K.
building	Curtin Institutional Repository
collection	Online Access
description	We report on the redshift measurement and CO line excitation of HERMES J105751.1+573027 (HLSW-01), a strongly lensed submillimeter galaxy discovered in Herschel/SPIRE observations as part of the Herschel Multi-tiered Extragalactic Survey (HerMES). HLSW-01 is an ultra-luminous galaxy with an intrinsic far-infrared luminosity of L FIR = 1.4 × 1013 L ☉, and is lensed by a massive group of galaxies into at least four images with a total magnification of μ = 10.9 ± 0.7. With the 100 GHz instantaneous bandwidth of the Z-Spec instrument on the Caltech Submillimeter Observatory, we robustly identify a redshift of z = 2.958 ± 0.007 for this source, using the simultaneous detection of four CO emission lines (J = 7 → 6, J = 8 → 7, J = 9 → 8, and J = 10 → 9). Combining the measured line fluxes for these high-J transitions with the J = 1 → 0, J = 3 → 2, and J = 5 → 4 line fluxes measured with the Green Bank Telescope, the Combined Array for Research in Millimeter Astronomy, and the Plateau de Bure Interferometer, respectively, we model the physical properties of the molecular gas in this galaxy. We find that the full CO spectral line energy distribution is described well by warm, moderate-density gas with T kin = 86-235 K and nH2= (1.1-3.5) x 10 3 cm–3. However, it is possible that the highest-J transitions are tracing a small fraction of very dense gas in molecular cloud cores, and two-component models that include a warm/dense molecular gas phase with T kin ~ 200 K, nH2 ~ 10 5 cm–3 are also consistent with these data. Higher signal-to-noise measurements of the J up ≥ 7 transitions with high spectral resolution, combined with high spatial resolution CO maps, are needed to improve our understanding of the gas excitation, morphology, and dynamics of this interesting high-redshift galaxy.
first_indexed	2025-11-14T08:19:39Z
format	Journal Article
id	curtin-20.500.11937-30591
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T08:19:39Z
publishDate	2011
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-305912017-09-13T15:33:37Z Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01 Scott, K. Lupu, R. Aguirre, J. Auld, R. Aussel, H. Baker, A. Beelen, A. Bock, J. Bradford, C. Brisbin, D. Burgarella, D. Carpenter, J. Chanial, P. Chapman, S. Clements, D. Conley, A. Cooray, A. Cox, P. Dowell, C. Eales, S. Farrah, D. Franceschini, A. Frayer, D. Gavazzi, R. Glenn, J. Griffin, M. Harris, A. Ibar, E. Ivison, R. Kamenetzky, J. Kim, S. Krips, M. Maloney, P. Matsuhara, H. Mortier, A. Murphy, E. Naylor, B. Neri, R. Nguyen, H. Oliver, S. Omont, A. Page, M. Papageorgiou, A. Pearson, C. Pérez-Fournon, I. Pohlen, M. Rawlings, J. Raymond, G. Riechers, D. Rodighiero, G. Roseboom, I. Rowan-Robinson, M. Scott, D. Seymour, Nick Smith, A. Symeonidis, M. Tugwell, K. Vaccari, M. Vieira, J. Vigroux, L. Wang, L. Wright, G. Zmuidzinas, J. We report on the redshift measurement and CO line excitation of HERMES J105751.1+573027 (HLSW-01), a strongly lensed submillimeter galaxy discovered in Herschel/SPIRE observations as part of the Herschel Multi-tiered Extragalactic Survey (HerMES). HLSW-01 is an ultra-luminous galaxy with an intrinsic far-infrared luminosity of L FIR = 1.4 × 1013 L ☉, and is lensed by a massive group of galaxies into at least four images with a total magnification of μ = 10.9 ± 0.7. With the 100 GHz instantaneous bandwidth of the Z-Spec instrument on the Caltech Submillimeter Observatory, we robustly identify a redshift of z = 2.958 ± 0.007 for this source, using the simultaneous detection of four CO emission lines (J = 7 → 6, J = 8 → 7, J = 9 → 8, and J = 10 → 9). Combining the measured line fluxes for these high-J transitions with the J = 1 → 0, J = 3 → 2, and J = 5 → 4 line fluxes measured with the Green Bank Telescope, the Combined Array for Research in Millimeter Astronomy, and the Plateau de Bure Interferometer, respectively, we model the physical properties of the molecular gas in this galaxy. We find that the full CO spectral line energy distribution is described well by warm, moderate-density gas with T kin = 86-235 K and nH2= (1.1-3.5) x 10 3 cm–3. However, it is possible that the highest-J transitions are tracing a small fraction of very dense gas in molecular cloud cores, and two-component models that include a warm/dense molecular gas phase with T kin ~ 200 K, nH2 ~ 10 5 cm–3 are also consistent with these data. Higher signal-to-noise measurements of the J up ≥ 7 transitions with high spectral resolution, combined with high spatial resolution CO maps, are needed to improve our understanding of the gas excitation, morphology, and dynamics of this interesting high-redshift galaxy. 2011 Journal Article http://hdl.handle.net/20.500.11937/30591 10.1088/0004-637X/733/1/29 unknown
spellingShingle	Scott, K. Lupu, R. Aguirre, J. Auld, R. Aussel, H. Baker, A. Beelen, A. Bock, J. Bradford, C. Brisbin, D. Burgarella, D. Carpenter, J. Chanial, P. Chapman, S. Clements, D. Conley, A. Cooray, A. Cox, P. Dowell, C. Eales, S. Farrah, D. Franceschini, A. Frayer, D. Gavazzi, R. Glenn, J. Griffin, M. Harris, A. Ibar, E. Ivison, R. Kamenetzky, J. Kim, S. Krips, M. Maloney, P. Matsuhara, H. Mortier, A. Murphy, E. Naylor, B. Neri, R. Nguyen, H. Oliver, S. Omont, A. Page, M. Papageorgiou, A. Pearson, C. Pérez-Fournon, I. Pohlen, M. Rawlings, J. Raymond, G. Riechers, D. Rodighiero, G. Roseboom, I. Rowan-Robinson, M. Scott, D. Seymour, Nick Smith, A. Symeonidis, M. Tugwell, K. Vaccari, M. Vieira, J. Vigroux, L. Wang, L. Wright, G. Zmuidzinas, J. Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01
title	Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01
title_full	Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01
title_fullStr	Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01
title_full_unstemmed	Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01
title_short	Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01
title_sort	redshift determination and co line excitation modeling for the multiply lensed galaxy hlsw-01
url	http://hdl.handle.net/20.500.11937/30591

Redshift determination and CO line excitation modeling for the multiply lensed galaxy HLSW-01

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