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Title: Fluid dynamics of stellar jets in real time: Third Epoch Hubble Space Telescope images of HH 1, HH 34, AND HH 47

Abstract

We present new, third-epoch Hubble Space Telescope Hα and [S II] images of three Herbig-Haro (HH) jets (HH 1&2, HH 34, and HH 47) and compare the new images with those from previous epochs. The high spatial resolution, coupled with a time series whose cadence is of order both the hydrodynamic and radiative cooling timescales of the flow, allows us to follow the hydrodynamic/magnetohydrodynamic evolution of an astrophysical plasma system in which ionization and radiative cooling play significant roles. Cooling zones behind the shocks are resolved, so it is possible to identify which way material flows through a given shock wave. The images show that heterogeneity is paramount in these jets, with clumps dominating the morphologies of both bow shocks and their Mach disks. This clumpiness exists on scales smaller than the jet widths and determines the behavior of many of the features in the jets. Evidence also exists for considerable shear as jets interact with their surrounding molecular clouds, and in several cases we observe shock waves as they form and fade where material emerges from the source and as it proceeds along the beam of the jet. Fine structure within two extended bow shocks may result from Machmore » stems that form at the intersection points of oblique shocks within these clumpy objects. Taken altogether, these observations represent the most significant foray thus far into the time domain for stellar jets, and comprise one of the richest data sets in existence for comparing the behavior of a complex astrophysical plasma flow with numerical simulations and laboratory experiments.« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [3];  [4];  [5];  [5]
  1. Rice Univ., Houston, TX (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Rice Univ., Houston, TX (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
AWE LANL LLE General Atomics LLNL
OSTI Identifier:
1334724
Grant/Contract Number:  
NA0000904
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 97 MATHEMATICS AND COMPUTING; Herbig-Haro objects; hydrodynamics; ISM: jets and outflows

Citation Formats

Hartigan, P., Frank, A., Foster, J. M., Wilde, B. H., Douglas, M., Rosen, P. A., Coker, R. F., Blue, B. E., and Hansen, J. F. Fluid dynamics of stellar jets in real time: Third Epoch Hubble Space Telescope images of HH 1, HH 34, AND HH 47. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/1/29.
Hartigan, P., Frank, A., Foster, J. M., Wilde, B. H., Douglas, M., Rosen, P. A., Coker, R. F., Blue, B. E., & Hansen, J. F. Fluid dynamics of stellar jets in real time: Third Epoch Hubble Space Telescope images of HH 1, HH 34, AND HH 47. United States. doi:10.1088/0004-637X/736/1/29.
Hartigan, P., Frank, A., Foster, J. M., Wilde, B. H., Douglas, M., Rosen, P. A., Coker, R. F., Blue, B. E., and Hansen, J. F. Fri . "Fluid dynamics of stellar jets in real time: Third Epoch Hubble Space Telescope images of HH 1, HH 34, AND HH 47". United States. doi:10.1088/0004-637X/736/1/29. https://www.osti.gov/servlets/purl/1334724.
@article{osti_1334724,
title = {Fluid dynamics of stellar jets in real time: Third Epoch Hubble Space Telescope images of HH 1, HH 34, AND HH 47},
author = {Hartigan, P. and Frank, A. and Foster, J. M. and Wilde, B. H. and Douglas, M. and Rosen, P. A. and Coker, R. F. and Blue, B. E. and Hansen, J. F.},
abstractNote = {We present new, third-epoch Hubble Space Telescope Hα and [S II] images of three Herbig-Haro (HH) jets (HH 1&2, HH 34, and HH 47) and compare the new images with those from previous epochs. The high spatial resolution, coupled with a time series whose cadence is of order both the hydrodynamic and radiative cooling timescales of the flow, allows us to follow the hydrodynamic/magnetohydrodynamic evolution of an astrophysical plasma system in which ionization and radiative cooling play significant roles. Cooling zones behind the shocks are resolved, so it is possible to identify which way material flows through a given shock wave. The images show that heterogeneity is paramount in these jets, with clumps dominating the morphologies of both bow shocks and their Mach disks. This clumpiness exists on scales smaller than the jet widths and determines the behavior of many of the features in the jets. Evidence also exists for considerable shear as jets interact with their surrounding molecular clouds, and in several cases we observe shock waves as they form and fade where material emerges from the source and as it proceeds along the beam of the jet. Fine structure within two extended bow shocks may result from Mach stems that form at the intersection points of oblique shocks within these clumpy objects. Taken altogether, these observations represent the most significant foray thus far into the time domain for stellar jets, and comprise one of the richest data sets in existence for comparing the behavior of a complex astrophysical plasma flow with numerical simulations and laboratory experiments.},
doi = {10.1088/0004-637X/736/1/29},
journal = {Astrophysical Journal},
number = 1,
volume = 736,
place = {United States},
year = {2011},
month = {7}
}

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