J/A+A/481/123 Near-IR IFU spectroscopy of HH99B (Giannini+, 2008)
Near-infrared, IFU spectroscopy unravels the bow-shock HH99B.
Giannini T., Calzoletti L., Nisini B., Davis C.J., Eisloeffel J., Smith M.D.
<Astron. Astrophys. 481, 123 (2008)>
=2008A&A...481..123G 2008A&A...481..123G
ADC_Keywords: YSOs ; Spectroscopy ; Spectra, infrared
Keywords: stars: circumstellar matter - infrared: ISM -
ISM: Herbig-Haro objects - ISM: individual objects: HH99 -
ISM: jets and outflows
Abstract:
We aim at characterising the morphology and the physical parameters
governing the shock physics of the Herbig-Haro object HH99B. We
obtained SINFONI-SPIFFI IFU spectroscopy (R∼2000-4000) between 1.10
and 2.45µm detecting more than 170 emission lines, that, to a
large extent, have never observed before in a Herbig-Haro object. Most
of them come from ro-vibrational transitions of molecular hydrogen
(vup≤7, Eup~<38000K) and [FeII] (Eup~<30000K). In addition, we
observed several hydrogen and helium recombination lines, along with
fine-structure lines of ionic species. All the brightest lines appear
resolved in velocity.
Intensity ratios of ionic lines were compared with predictions of NLTE
models to derive bi-dimensional maps of extinction and electron
density, along with estimates of temperature, fractional ionisation,
and atomic hydrogen post-shock density. The H2 line intensities were
interpreted in the framework of Boltzmann diagrams, from which we have
derived extinction and temperature maps of the molecular gas. From the
intensity maps of bright lines (i.e. H2 2.122µm and
[FeII]1.644µm), the kinematical properties of the shock(s) at work
in the region were delineated. Finally, from selected [FeII] lines,
constraints on the spontaneous emission coefficients of the 1.257,
1.321, and 1.644µm lines are provided.
Description:
Bidimensional images of the lines (175) detected in HH99B and listed
in Tables 1-2. The filename refers to the vacuum wavelength (lambda)
of the line (in micron).
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
19 02 05.6 -36 54 35 HH99B = HH 99B
-----------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table12.dat 66 175 Lines observed in HH99B
notes.dat 68 31 Individual notes
fit/* . 175 Line images in FITS format
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Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- El Element
8 A1 --- n_El [b] Note on [FeII] lines (1)
10- 31 A22 --- Line Line identification
33- 37 A5 --- n_Line Note on line, detailed in notes.dat file
39- 44 F6.4 um lambda0 Vacuum wavelength
46- 51 I6 K Eup Upper level energy
53- 55 I3 --- S/Nmax Maximum signal-to-noise ratio in the
line image (2)
57- 66 A10 --- FileName Name of the file containing the bidimensional
images of the line in subdirectory fit
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Note (1): Lines coming from the same upper level are grouped.
Note (2): In case of blends the reported number refers to the sum of the
blended lines (unless the emission comes from different zones of the bow).
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Byte-by-byte Description of file: notes.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Note Note number
4- 68 A65 --- Text Text of the note
--------------------------------------------------------------------------------
Acknowledgements:
Teresa Giannini, giannini(at)mporzio.astro.it
(End) Patricia Vannier [CDS] 11-Jan-2008