Imperial College London
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Dr Clements

Faculty of Natural Sciences, Department of Physics

Reader in Astrophysics
 
 
 
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Contact

 

+44 (0)20 7594 7693d.clements

 
 
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Location

 

1011Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wilson:2017:1538-4357/aa8cc7,
author = {Wilson, D and Cooray, A and Nayyeri, H and Bonato, M and Bradford, CM and Clements, DL and De, Zotti G and Diaz-Santos, T and Farrah, D and Magdis, G and Michalowski, MJ and Pearson, C and Rigopoulou, D and Valtchanov, I and Wang, L and Wardlow, J},
doi = {1538-4357/aa8cc7},
journal = {Astrophysical Journal},
title = {Stacked average far-infrared spectrum of dusty star-forming galaxies from the Herschel/SPIRE Fourier Transform Spectrometer},
url = {http://dx.doi.org/10.3847/1538-4357/aa8cc7},
volume = {848},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present stacked average far-infrared spectra of a sample of 197 dusty star-forming galaxies (DSFGs) at $0.005\lt z\lt 4$ using about 90% of the Herschel Space Observatory SPIRE Fourier Transform Spectrometer (FTS) extragalactic data archive based on 3.5 years of science operations. These spectra explore an observed-frame 447–1568 GHz frequency range, allowing us to observe the main atomic and molecular lines emitted by gas in the interstellar medium. The sample is subdivided into redshift bins, and a subset of the bins are stacked by infrared luminosity as well. These stacked spectra are used to determine the average gas density and radiation field strength in the photodissociation regions (PDRs) of DSFGs. For the low-redshift sample, we present the average spectral line energy distributions of CO and H2O rotational transitions and consider PDR conditions based on observed [C i] 370 and 609 μm, and CO (7-6) lines. For the high-z ($0.8\lt z\lt 4$) sample, PDR models suggest a molecular gas distribution in the presence of a radiation field that is at least a factor of 103 larger than the Milky Way and with a neutral gas density of roughly ${10}^{4.5}$–${10}^{5.5}$ cm−3. The corresponding PDR models for the low-z sample suggest a UV radiation field and gas density comparable to those at high-z. Given the challenges in obtaining adequate far-infrared observations, the stacked average spectra we present here will remain the measurements with the highest signal-to-noise ratio for at least a decade and a half until the launch of the next far-infrared facility.
AU  - Wilson,D
AU  - Cooray,A
AU  - Nayyeri,H
AU  - Bonato,M
AU  - Bradford,CM
AU  - Clements,DL
AU  - De,Zotti G
AU  - Diaz-Santos,T
AU  - Farrah,D
AU  - Magdis,G
AU  - Michalowski,MJ
AU  - Pearson,C
AU  - Rigopoulou,D
AU  - Valtchanov,I
AU  - Wang,L
AU  - Wardlow,J
DO  - 1538-4357/aa8cc7
PY  - 2017///
SN  - 0004-637X
TI  - Stacked average far-infrared spectrum of dusty star-forming galaxies from the Herschel/SPIRE Fourier Transform Spectrometer
T2  - Astrophysical Journal
UR  - http://dx.doi.org/10.3847/1538-4357/aa8cc7
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000412575600010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/60568
VL  - 848
ER  -
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