%0 Generic %1 Valtchanov2011 %A Valtchanov, Ivan %A Virdee, J. %A Ivison, R. J. %A Swinyard, B. %A van der Werf, P. %A Rigopoulou, D. %A da Cunha, E. %A Lupu, R. %A Benford, D. J. %A Riechers, D. %A Smail, Ian %A Jarvis, M. %A Pearson, C. %A Gomez, H. %A Hopwood, R. %A Altieri, B. %A Birkinshaw, M. %A Coia, D. %A Conversi, L. %A Cooray, A. %A Zotti, G. De %A Dunne, L. %A Frayer, D. %A Leeuw, L. %A Marston, A. %A Negrello, M. %A Portal, M. Sanchez %A Scott, D. %A Thompson, M. A. %A Vaccari, M. %A Baes, M. %A Clements, D. %A Michalowski, M. J. %A Dannerbauer, H. %A Serjeant, S. %A Auld, R. %A Buttiglione, S. %A Cava, A. %A Dariush, A. %A Dye, S. %A Eales, S. %A Fritz, J. %A Ibar, E. %A Maddox, S. %A Pascale, E. %A Pohlen, M. %A Rigby, E. %A Rodighiero, G. %A Smith, D. J. B. %A Temi, P. %A Carpenter, J. %A Bolatto, A. %A Gurwell, M. %D 2011 %K PDR [CII] high-z ism %T Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS %U http://arxiv.org/abs/1105.3924 %X We present Herschel-SPIRE Fourier Transform Spectrometer (FTS) and radio follow-up observations of two Herschel-ATLAS (H-ATLAS) detected strongly lensed distant galaxies. In one of the targeted galaxies H-ATLAS J090311.6+003906 (SDP.81) we detect OIII 88and CII 158lines at a signal-to-noise ratio of ~5. We do not have any positive line identification in the other fainter target H-ATLAS J091305.0-005343 (SDP.130). Currently SDP.81 is the faintest sub-mm galaxy with positive line detections with the FTS, with continuum flux just below 200 mJy in the 200-600 wavelength range. The derived redshift of SDP.81 from the two detections is z=3.043 +/-0.012, in agreement with ground-based CO measurements. This is the first detection by Herschel of the OIII 88line in a galaxy at redshift higher than 0.05. Comparing the observed lines and line ratios with a grid of photo-dissociation region (PDR) models with different physical conditions, we derive the PDR cloud density n ~ 2000 cm^-3 and the far-UV ionizing radiation field G_0 ~ 200 (in units of the Habing field -- the local Galactic interstellar radiation field of 1.6x10^-6 W/m^2). Using the CO derived molecular mass and the PDR properties we estimate the effective radius of the emitting region to be 500-700 pc. These characteristics are typical for star-forming, high redshift galaxies. The radio observations indicate that SDP.81 deviates significantly from the local FIR/radio correlation, which hints that some fraction of the radio emission is coming from an AGN. The constraints on the source size from millimiter-wave observations put a very conservative upper limit of the possible AGN contribution to less than 33%. These indications, together with the high OIII/FIR ratio and the upper limit of OI 63\mum/CII 158suggest that some fraction of the ionizing radiation is likely to originate from an AGN.

@misc{Valtchanov2011, abstract = { We present Herschel-SPIRE Fourier Transform Spectrometer (FTS) and radio follow-up observations of two Herschel-ATLAS (H-ATLAS) detected strongly lensed distant galaxies. In one of the targeted galaxies H-ATLAS J090311.6+003906 (SDP.81) we detect [OIII] 88\mum and [CII] 158\mum lines at a signal-to-noise ratio of ~5. We do not have any positive line identification in the other fainter target H-ATLAS J091305.0-005343 (SDP.130). Currently SDP.81 is the faintest sub-mm galaxy with positive line detections with the FTS, with continuum flux just below 200 mJy in the 200-600 \mum wavelength range. The derived redshift of SDP.81 from the two detections is z=3.043 +/-0.012, in agreement with ground-based CO measurements. This is the first detection by Herschel of the [OIII] 88\mum line in a galaxy at redshift higher than 0.05. Comparing the observed lines and line ratios with a grid of photo-dissociation region (PDR) models with different physical conditions, we derive the PDR cloud density n ~ 2000 cm^{-3} and the far-UV ionizing radiation field G_0 ~ 200 (in units of the Habing field -- the local Galactic interstellar radiation field of 1.6x10^{-6} W/m^2). Using the CO derived molecular mass and the PDR properties we estimate the effective radius of the emitting region to be 500-700 pc. These characteristics are typical for star-forming, high redshift galaxies. The radio observations indicate that SDP.81 deviates significantly from the local FIR/radio correlation, which hints that some fraction of the radio emission is coming from an AGN. The constraints on the source size from millimiter-wave observations put a very conservative upper limit of the possible AGN contribution to less than 33%. These indications, together with the high [OIII]/FIR ratio and the upper limit of [OI] 63\mum/[CII] 158\mum suggest that some fraction of the ionizing radiation is likely to originate from an AGN. }, added-at = {2011-05-20T20:18:47.000+0200}, author = {Valtchanov, Ivan and Virdee, J. and Ivison, R. J. and Swinyard, B. and van der Werf, P. and Rigopoulou, D. and da Cunha, E. and Lupu, R. and Benford, D. J. and Riechers, D. and Smail, Ian and Jarvis, M. and Pearson, C. and Gomez, H. and Hopwood, R. and Altieri, B. and Birkinshaw, M. and Coia, D. and Conversi, L. and Cooray, A. and Zotti, G. De and Dunne, L. and Frayer, D. and Leeuw, L. and Marston, A. and Negrello, M. and Portal, M. Sanchez and Scott, D. and Thompson, M. A. and Vaccari, M. and Baes, M. and Clements, D. and Michalowski, M. J. and Dannerbauer, H. and Serjeant, S. and Auld, R. and Buttiglione, S. and Cava, A. and Dariush, A. and Dye, S. and Eales, S. and Fritz, J. and Ibar, E. and Maddox, S. and Pascale, E. and Pohlen, M. and Rigby, E. and Rodighiero, G. and Smith, D. J. B. and Temi, P. and Carpenter, J. and Bolatto, A. and Gurwell, M.}, biburl = {https://www.bibsonomy.org/bibtex/265c52f2c6ac05b09f9b61bcf5ce6d836/miki}, description = {[1105.3924] Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS}, interhash = {5fc74413d8376f0a7fc86210ca2335a2}, intrahash = {65c52f2c6ac05b09f9b61bcf5ce6d836}, keywords = {PDR [CII] high-z ism}, note = {cite arxiv:1105.3924 Comment: 13 pages, 6 figures, accepted in MNRAS}, timestamp = {2011-05-20T20:18:47.000+0200}, title = {Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS}, url = {http://arxiv.org/abs/1105.3924}, year = 2011 }