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Proceedings Article

Sky background subtraction with fiber-fed spectrographs

[+] Author Affiliations
M. Puech, M. Rodrigues, Y. Yang, H. Flores, F. Royer, K. Disseau, F. Hammer

GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)

T. Gonçalves

Univ. Federal do Rio de Janeiro (Brazil)

M. Cirasuolo

SUPA, Institute for Astronomy, Univ. of Edinburgh, Royal Observatory (United Kingdom)

C. J. Evans

UK Astronomy Technology Ctr. (United Kingdom)

G. Li Causi

INAF - Osservatorio Astronomico di Roma (Italy)

R. Maiolino

Univ. of Cambridge (United Kingdom)

C. Melo

European Southern Observatory (Chile)

Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91476L (July 8, 2014); doi:10.1117/12.2055137
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From Conference Volume 9147

  • Ground-based and Airborne Instrumentation for Astronomy V
  • Suzanne K. Ramsay; Ian S. McLean; Hideki Takami
  • Montréal, Quebec, Canada | June 22, 2014

abstract

Fiber-fed spectrographs can now have throughputs equivalent to slit spectrographs. However, the sky subtraction accuracy that can be reached on such instruments has often been pinpointed as one of their major issues, in relation to difficulties in scattered light and flat-field corrections or throughput losses associated with fibers. Using technical time observations with FLAMES-GIRAFFE, two observing techniques, namely dual staring and cross beam switching modes, were tested and the resulting sky subtraction accuracy reached in both cases was quantified. Results indicate that an accuracy of 0.6% on the sky subtraction can be reached, provided that the cross beam switching mode is used. This is very encouraging regarding the detection of very faint sources with future fiber-fed spectrographs such as VLT/MOONS or E-ELT/MOSAIC. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

M. Puech ; M. Rodrigues ; Y. Yang ; H. Flores ; F. Royer, et al.
" Sky background subtraction with fiber-fed spectrographs ", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91476L (July 8, 2014); doi:10.1117/12.2055137; http://dx.doi.org/10.1117/12.2055137


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