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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A treatment procedure for Gemini North/NIFS data cubes: application to NGC 4151

Full text
Author(s):
Menezes, R. B. [1] ; Steiner, J. E. [1] ; Ricci, T. V. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 438, n. 3, p. 2597-2620, MAR 2014.
Web of Science Citations: 26
Abstract

We present a detailed procedure for treating data cubes obtained with the Near-Infrared Integral Field Spectrograph (NIFS) of the Gemini North telescope. This process includes the following steps: correction of the differential atmospheric refraction, spatial re-sampling, Butterworth spatial filtering, `instrumental fingerprint' removal and Richardson-Lucy deconvolution. The clearer contours of the structures obtained with the spatial re-sampling, the high spatial-frequency noise removed with the Butterworth spatial filtering, the removed `instrumental fingerprints' (which take the form of vertical stripes along the images) and the improvement of the spatial resolution obtained with the Richardson-Lucy deconvolution result in images with a considerably higher quality. An image of the Br gamma emission line from the treated data cube of NGC 4151 allows the detection of individual ionized-gas clouds (almost undetectable without the treatment procedure) of the narrow-line region of this galaxy, which are also seen in an {[}O III] image obtained with the Hubble Space Telescope. The radial velocities determined for each one of these clouds seem to be compatible with models of biconical outflows proposed by previous studies. Considering the observed improvements, we believe that the procedure we describe in this work may result in more reliable analysis of data obtained with this instrument. (AU)

FAPESP's process: 12/02268-8 - Galactic nuclei in the local universe: supermassive black holes and stellar archeology of galaxies of high and low masses
Grantee:Roberto Bertoldo Menezes
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/21350-7 - Nuclear and circumnuclear low ionization emission in massive galaxies
Grantee:Tiago Vecchi Ricci
Support type: Scholarships in Brazil - Post-Doctorate