J/A+A/635/A111 M16 SITELLE datacube (Flagey+, 2020)
Wide field-of-view study of the Eagle Nebula with the Fourier transform
imaging spectrograph SITELLE at CFHT.
Flagey N., McLeod A.F., Aguilar L., Prunet S.
<Astron. Astrophys. 635, A111 (2020)>
=2020A&A...635A.111F 2020A&A...635A.111F (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Star Forming Region
Keywords: instrumentation: spectrographs - techniques: imaging spectroscopy -
H II regions - ISM: individual objects: M 16 - Herbig-Haro objects
Abstract:
We present the very first wide-field, 11' by 11', optical spectral
mapping of M16, one of the most famous star-forming regions in the
Galaxy. The data were acquired with the new imaging Fourier transform
spectrograph SITELLE mounted on the Canada-France-Hawaii Telescope
(CFHT).
We obtained three spectral cubes with a resolving power of 10000 (SN1
filter), 1500(SN2 filter) and 600 (SN3 filter), centered on the iconic
Pillars of Creation and the HH 216 flow, covering the main optical
nebular emission lines, namely [OII]λ3726,29 (SN1), Hβ,
[OIII]λ4959,5007 (SN2), [NII]λ6548,84, Hα, and
[SII]λ6717,31 (SN3).
We validate the performance, calibration, and data reduction of
SITELLE, and analyze the structures in the large field-of-view in
terms of their kinematics and nebular emission.
We compared the SITELLE data to MUSE integral field observations and
other spectroscopic and narrow-band imaging data to validate the
performance of SITELLE. We computed gas-phase metallicities via the
strong-line method, performed a pixel-by-pixel fit to the main
emission lines to derive kinematics of the ionized gas, computed the
mass-loss rate of the Eastern pillar (also known as the Spire), and
combined the SITELLE data with near-infrared narrow-band imaging to
characterize the HH 216 flow.
The comparison with previously published fluxes demonstrates very good
agreement. We disentangle the dependence of the gas-phase
metallicities (derived via abundance-tracing line ratios) on the
degree of ionization and obtain metallicities that are in excellent
agreement with the literature. We confirm the bipolar structure of
HH216, find evidence for episodic accretion from the source of the
flow, and identify its likely driving source. We compute the mass-loss
rate of the Spire pillar on the East side of the HII region and find
excellent agreement with the correlation between the mass-loss rate
and the ionizing photon flux from the nearby cluster NGC6611.
Description:
CFHT SITELLE SN1 SN2 SN3 July 10, 2016 and July 1, 2017
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
18 18 48 -13 48.4 M16 = IC 4703
-----------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 135 3 Information on datacube
fits/* . 3 Datacube
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 32 I3 --- Nz Number of pixels along Z-axis
34- 43 A10 "date" Obs.date Observation date
45- 51 F7.1 cm-1 bWAVE Lower value of wavenumber interval
53- 59 F7.1 cm-1 BWAVE Upper value of wavenumber interval
61- 68 F8.5 cm-1 dWAVE Wavenumber resolution
70- 76 I7 Kibyte size Size of FITS file
78-104 A27 --- FileName Name of FITS file, in subdirectory fits
106-135 A30 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Nicolas Flagey, flagey(at)cfht.hawaii.edu
(End) Patricia Vannier [CDS] 14-Feb-2020