2007A&A...474..941G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST02:29:23

2007A&A...474..941G - Astronomy and Astrophysics, volume 474, 941-950 (2007/11-2)

Quantitative optical and near-infrared spectroscopy of H2 towards HH 91A.

GREDEL R.

Abstract (from CDS):

Optical and near-infrared spectroscopy of molecular hydrogen in interstellar shocks provide a very powerful probe of the physical conditions that prevail in interstellar shocks. Integral-field spectroscopy of H2 in the optical wavelength region and complementary long-slit near-infrared spectroscopy towards HH91A are used to characterize the ro-vibrational population distribution among H2 levels with excitation energies up to 30000cm–1. The detection of some 200 ro-vibrational lines of molecular hydrogen ranging between 7700Å and 2.3µm is reported. Emission lines which arise from vibrational levels up to v'=8 are detected. The H2 emission arises from thermally excited gas where the bulk of the material is at a temperature of 2750K and where 1% is at 6000K. The total column density of shocked molecular hydrogen is N(H2)=1018cm–2. Non-thermal excitation scenarios such as UV fluorescence do not contribute to the H2 excitation observed towards HH91A. The emission of molecular hydrogen towards HH91A is explained in terms of a slow J-shock that propagates into a low-density medium, that has been swept up by previous episodes of outflows that have occurred in the evolved HH90/91 complex.

Abstract Copyright:

Journal keyword(s): ISM: molecules - ISM: Herbig-Haro objects - ISM: jets and outflows

VizieR on-line data: <Available at CDS (J/A+A/474/941): table1.dat table2.dat table3.dat table4.dat>

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 821 0
2 HH 2A HH 05 36 25.26 -06 47 10.9           ~ 45 0
3 HH 90 HH 05 41 25.2 -01 10 02           ~ 12 0
4 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 581 1
5 HH 91 HH 05 41 58.2 -01 13 37           ~ 27 1
6 HH 91A HH 05 41 58.2 -01 13 37           ~ 12 0
7 LDN 1630 DNe 05 45.5 -00 59           ~ 358 0
8 HH 54 HH 12 55 49.5 -76 56 08           ~ 118 0

    Equat.    Gal    SGal    Ecl

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2021.05.16-02:29:23

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