SIMBAD references

2013ApJ...772L...9F - Astrophys. J., 772, L9 (2013/July-3)

H2 excitation structure on the sightlines to δ Scorpii and ζ ophiuci: first results from the sub-orbital local interstellar cloud experiment.

FRANCE K., NELL N., KANE R., BURGH E.B., BEASLEY M. and GREEN J.C.

Abstract (from CDS):

We present the first science results from the Sub-orbital Local Interstellar Cloud Experiment (SLICE): moderate resolution 1020-1070 Å spectroscopy of four sightlines through the local interstellar medium. High signal-to-noise (S/N) spectra of η Uma, α Vir, δ Sco, and ζ Oph were obtained during a 2013 April 21 rocket flight. The SLICE observations constrain the density, molecular photoexcitation rates, and physical conditions present in the interstellar material toward δ Sco and ζ Oph. Our spectra indicate a factor of two lower total N(H2) than previously reported for δ Sco, which we attribute to higher S/N and better scattered light control in the new SLICE observations. We find N(H2) = 1.5x1019/cm2 on the δ Sco sightline, with kinetic and excitation temperatures of 67 and 529 K, respectively, and a cloud density of nH= 56/cm3. Our observations of the bulk of the molecular sightline toward ζ Oph are consistent with previous measurements (N(H2) ~ 3x1020/cm2 at T01(H2) = 66 K and Texc= 350 K). However, we detect significantly more rotationally excited H2 toward ζ Oph than previously observed. We infer a cloud density in the rotationally excited component of nH~ 7600/cm3 and suggest that the increased column densities of excited H2 are a result of the ongoing interaction between ζ Oph and its environment; also manifest as the prominent mid-IR bowshock observed by WISE and the presence of vibrationally excited H2 molecules observed by the Hubble Space Telescope.

Abstract Copyright:

Journal keyword(s): instrumentation: spectrographs - ISM: molecules - stars: individual (η UMa (HD 120315), α Vir (HD 116658), δ Sco (HD 143275), ζ Oph (HD 149757))

Simbad objects: 7

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