J/ApJ/918/27 VLT/UVES spectrosc. in Orion. II. HH204 (Mendez-delgado+, 2021)
Photoionized Herbig-Haro objects in the Orion Nebula through deep high spectral
resolution spectroscopy.
II. HH 204.
Mendez-delgado J.E., Henney W.J., Esteban C., Garcia-Rojas J.,
Mesa-Delgado A., Arellano-Cordova K.Z.
<Astrophys. J., 918, 27-27 (2021)>
=2021ApJ...918...27M 2021ApJ...918...27M (SIMBAD/NED BibCode)
ADC_Keywords: Spectra, optical; Star Forming Region; Interstellar medium;
H II regions
Keywords: Interstellar medium; Chemical abundances; Herbig-Haro objects;
H II regions
Abstract:
We analyze the physical conditions, chemical composition, and other
properties of the photoionized Herbig-Haro (HH) object HH 204 through
Very Large Telescope echelle spectroscopy and Hubble Space Telescope
imaging. We kinematically isolate the high-velocity emission of HH 204
from the emission of the background nebula and study the subarcsecond
distribution of physical conditions and ionic abundances across the HH
object. We find that low- and intermediate-ionization emission arises
exclusively from gas at photoionization equilibrium temperatures,
whereas the weak high-ionization emission from HH 204 shows a
significant contribution from higher-temperature shock-excited gas. We
separately derive the ionic abundances of HH 204, the emission of the
Orion Nebula, and the fainter diffuse blue layer. In HH 204, the O+
abundance determined from collisional excited lines matches the one
based on recombination lines, while the O2+ abundance is very low,
so that the oxygen abundance discrepancy is zero. The ionic abundances
of Ni and Fe in HH 204 have similar ionization and depletion patterns,
with total abundances that are a factor of 3.5 higher than in the rest
of the Orion Nebula due to dust destruction in the bow shock. We show
that a failure to resolve the kinematic components in our spectra
would lead to significant error in the determination of chemical
abundances (for instance, a 40% underestimate of O), mainly due to
incorrect estimation of the electron density.
Description:
Observations of the photoionized Herbig-Haro (HH) object HH 204 at the
head of the bow shock were made during the nights of 2013 October 28
and 29 under photometric conditions using UVES in the UT2 of the VLT
in Cerro Paranal, Chile. The slit position was centered at the
coordinates RAJ2000=05:35:22.72,DEJ2000=-05:25:20.42 with a position
angle of 137°. The slit width provides an effective spectral
resolution λ/Δλ∼6.5km/s, covering the spectral
range between 3100 and 10420Å.
The 2D spectra (see Figure 2) show three evident components:
(1) the nebular one (the emission of the Orion Nebula), which is
rather homogeneously distributed along the spatial axis of the slit
and occupies the reddest spectral position;
(2) the "diffuse blue layer" (DBL), a slightly blueshifted homogeneous
diffuse component (previously detected by Deharveng 1973A&A....29..341D 1973A&A....29..341D)
that may correspond to a different HII region along the same line of
sight (Garcia-Diaz & Henney 2007AJ....133..952G 2007AJ....133..952G); and
(3) HH 204, the "ball-shaped" blueshifted component.
We define two spatial cuts (shown in Figure 2) covering a spatial area
of 7.38" for cut 1 and 1.97" for cut 2.
The study of the spatial distribution of the emission of HH 204 and
the gas flows that may give rise to it are based in the HST WFPC2
imaging in the F502N (λ=5012), F547M (λ=5446), F656N
(λ=6564), and F658N (λ=6591) filters from program
GO5469.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
05 35 22.59 -05 25 12.9 HH 204 = [M77] HH04
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table9a.dat 95 272 Emission line data from combined spectrum
table9b.dat 196 521 Emission line data from the spectra of cut 1
(spatial area of 7.38", see Figure 2)
table9c.dat 184 312 Emission line data from the spectra of cut 2
(spatial area of 1.97", see Figure 2)
table9d.dat 70 1005 Individual pixel emission line data
from the blue and red arms
fluxhb.dat 28 64 Hβ values per pixel
--------------------------------------------------------------------------------
See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
VI/64 : Recombination line intensities for hydrogenic ions (Storey+ 1995)
V/104 : General Catalogue of Herbig-Haro Objects (Reipurth+, 1999)
VI/141 : Nebular [OIII] collision strengths - SSB (Storey+, 2014)
VI/150 : Recombination coefficients for O II lines - SSB2 (Storey+, 2017)
J/AJ/111/846 : Orion HST survey (O'Dell+ 1996)
J/A+AS/116/573 : Transitions for FeIII (Quinet 1996)
J/A+AS/119/99 : [Ni I] & [Ni II] transition probabilities (Quinet+, 1996)
J/A+AS/119/523 : IRON project XVIII. Fe III data (Zhang 1996)
J/A+AS/126/373 : IRON Project XXVII. Fe IV collision strengths (Zhang+ 1997)
J/A+AS/142/85 : Recombination coefficients for C II lines (Davey+, 2000)
J/A+A/365/268 : IRON Project. XLVII. Ni III (Bautista, 2001)
J/AJ/124/445 : Internal velocities in Orion Nebula (Doi+, 2002)
J/ApJ/573/366 : Infrared photometry of Trapezium cluster (Muench+, 2002)
J/AJ/125/277 : High proper motions in central Orion nebula (O'dell+, 2003)
J/A+A/418/363 : Effective collision strengths for Cl II (Tayal+, 2004)
J/A+A/420/763 : Electron impact excitation of NiII (Bautista+, 2004)
J/AJ/127/3456 : Internal velocities in the Orion Nebula (Doi+, 2004)
J/MNRAS/362/301 : Spectrophot. of the HII region S311 (Garcia-Rojas+, 2005)
J/MNRAS/368/253 : Faint em. lines in M16, M20, NGC3603 (Garcia-Rojas+, 2006)
J/ApJ/644/1006 : HH 529 spectroscopy (Blagrave+, 2006)
J/A+A/469/1203 : IRON project LXIV (Melendez+, 2007)
J/MNRAS/391/1828 : FeIV energy levels & transition prob. (Fischer+, 2008)
J/MNRAS/395/855 : Spectroscopy (310-1040nm) of HH 202 (Mesa-Delgado+, 2009)
J/ApJS/188/32 : Breit-Pauli transition probabilities for SII (Tayal+, 2010)
J/ApJ/780/110 : SIII collision strengths (Grieve+, 2014)
J/A+A/565/A100 : NGC 288 hot horizontal branch stars abund. (Moehler+, 2014)
J/A+A/568/A9 : 300-2500nm flux calibration reference sp. (Moehler+, 2014)
J/ApJ/808/174 : FeII radiative transition rates (Bautista+, 2015)
J/AJ/150/108 : Spectroscopy and HST imaging in ONC (O'Dell+, 2015)
J/ApJ/814/52 : 3600-24700Å deep X-shooter sp. of HH 1 (Giannini+, 2015)
J/ApJS/229/34 : Preionization in radiative shocks (Sutherland+, 2017)
J/ApJ/864/136 : Massive star-forming regions (Binder+, 2018)
Byte-by-byte Description of file: table9a.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 0.1nm lambda [3187.7/10336.5] Rest wavelength; Angstroms
10- 17 A8 --- Ion Ion identifier
19- 25 F7.3 --- F/FHb [0.003/328] Line flux relative to Hβ (1)
27- 33 F7.3 --- I/IHb [0.002/274] Line intensity relative to Hβ
35- 36 I2 % Error [2/38] Percent error
38- 95 A58 --- Notes Additional notes
--------------------------------------------------------------------------------
Note (1): Where F(Hβ)=4.24e-12±1.65e-16erg/cm2/s and
C(Hβ)=0.36±0.02.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table9b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 0.1nm Wave1 [3187.7/10397.8] Rest wavelength; Angstroms
10- 18 A9 --- Ion Ion identifier
20- 27 F8.2 0.1nm OWave1 [3187.5/10397.2]? Observed wavelength in HH204;
Angstroms
29- 35 F7.2 km/s Vel1 [-104/9.6]? Velocity relative to rest velocity
in HH204
37- 41 F5.2 km/s FWHM1 [7.3/39.1]? Full-Width at Half-Maximum in HH204
43- 47 F5.2 km/s e_FWHM1 [0/12.2]? Uncertainty in FWHM1
49- 55 F7.3 --- F/FHb1 [0.002/339]? Line flux relative to Hβ in
HH204 (1)
57- 63 F7.3 --- I/IHb1 [0.002/274]? Line intensity relative to Hβ
in HH204
65- 66 I2 % Error1 [2/40]? Percent error in HH 204
67 A1 --- l_Error1 [:] : = error greater than 40%
68- 75 F8.2 0.1nm OWave2 [3187.8/10370.9]? Observed wavelength in Ori
Neb+"diffuse blue layer" (DBL); Angstroms
77- 81 F5.2 km/s Vel2 [3/42.4]? Velocity relative to rest velocity in
Ori Neb+DBL
83- 87 F5.2 km/s FWHM2 [6.5/44]? Full-Width at Half-Maximum in Ori
Neb+DBL
89- 93 F5.2 km/s e_FWHM2 [0/19.5]? Uncertainty in FWHM2
95- 101 F7.3 --- F/FHb2 [0.004/320]? Line flux relative to Hβ in
Ori Neb+DBL (1)
103- 109 F7.3 --- I/IHb2 [0.003/274]? Line intensity relative to Hβ
in Ori Neb+DBL
111- 112 I2 % Error2 [2/35]? Percent error in Ori Neb+DBL
113 A1 --- l_Error2 [:] : = error greater than 40%
114- 196 A83 --- Notes Additional notes
--------------------------------------------------------------------------------
Note (1): Where F(Hβ)=1.92e-12±8.20e-16erg/cm2/s and
C(Hβ)=0.42±0.02 for HH 204 and
F(Hβ)=1.89e-12±6.90e-16erg/cm2/s and
C(Hβ)=0.31±0.03 for Ori Neb+DBL.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table9c.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 0.1nm Wave1 [3187.7/10336.5] Rest wavelength; Angstroms
10- 17 A8 --- Ion Ion identifier
19- 25 F7.2 0.1nm OWave1 [3726/9531]? Observed wavelength in "diffuse
blue layer" (DBL); Angstroms
27- 31 F5.2 km/s Vel1 [-3.8/22.1]? Velocity relative to rest velocity
in DBL
33- 37 F5.2 km/s FWHM1 [6.9/25.8]? Full-Width at Half-Maximum in DBL
39- 42 F4.2 km/s e_FWHM1 [0/8.3]? Uncertainty in FWHM1
44- 50 F7.3 --- F/FHb1 [0.06/344]? Line flux relative to Hβ in
DBL (1)
52- 58 F7.3 --- I/IHb1 [0.04/278]? Line intensity relative to Hβ
in DBL
60- 61 I2 % Error1 [2/27]? Percent error in DBL
63- 70 F8.2 0.1nm OWave2 [3187.8/10337]? Observed wavelength in Orion
Nebula; Angstroms
72- 76 F5.2 km/s Vel2 [2.8/43.1]? Velocity relative to rest velocity
in Orion Nebula
78- 82 F5.2 km/s FWHM2 [5/40.2]? Full-Width at Half-Maximum in Orion
Nebula
84- 88 F5.2 km/s e_FWHM2 [0/11]? Uncertainty in FWHM2
90- 96 F7.3 --- F/FHb2 [0.007/313]? Line flux relative to Hβ in
Orion Nebula
98- 104 F7.3 --- I/IHb2 [0.005/269]? Line intensity relative to Hβ
in Orion Nebula
106- 107 I2 % Error2 [2/36]? Percent error in Orion Nebula
108 A1 --- l_Error1 [:] : = error greater than 40%
109- 184 A76 --- Notes Additional notes
--------------------------------------------------------------------------------
Note (1): Where F(Hβ)=8.92e-14±6.90e-17erg/cm2/s and
C(Hβ)=0.42±0.09 for DBL and
F(Hβ)=3.36e-13±7.30e-17erg/cm2/s and
C(Hβ)=0.30±0.04 for Orion Nebula.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table9d.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Arm UVES arm identifier ("blue" or "red")
6- 7 I2 --- Pixel [1/42] Pixel number
9- 15 F7.2 0.1nm lambda [3726/9903.5] Rest wavelength; Angstroms
17- 24 A8 --- Ion Ion identifier
26- 32 F7.2 0.1nm OWave [3725.7/9902.9] Observed wavelength; Angstroms
34- 39 F6.2 km/s Vel [-27.4/-8.4] Velocity relative to rest velocity
41- 45 F5.2 km/s FWHM [7.5/29] Full-Width at Half-Maximum
47- 50 F4.2 km/s e_FWHM [0/8] Uncertainty in FWHM
52- 58 F7.3 --- F/FHb [0.02/354] Line flux relative to Hβ (1)
60- 66 F7.3 --- I/IHb [0.01/286] Line intensity relative to Hβ
68- 69 I2 % Error [2/37]? Percent error
70 A1 --- l_Error [:] : = error greater than 40%
--------------------------------------------------------------------------------
Note (1): Where the Hβ fluxes (see fluxhb table) are in units
of erg/cm2/s.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fluxhb.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Arm UVES arm identifier ("blue": 27 occurrences;
or "red": 37 occurrences)
7- 8 I2 --- Pixel [1/42] Pixel number
10- 18 E9.4 mW/m2 Hbeta [1.6e-14/9.8e-14] Hbeta flux
in units of erg/cm2/s
20- 28 E9.4 mW/m2 e_Hbeta [8.5e-18/3.5e-17] Hbeta uncertainty
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Mendez-Delgado et al. Paper I. 2021MNRAS.502.1703M 2021MNRAS.502.1703M
Mendez-Delgado et al. Paper III. 2022MNRAS.514..744M 2022MNRAS.514..744M
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Jan-2023