THE 15–20 μm EMISSION IN THE REFLECTION NEBULA NGC 2023
نویسندگان
چکیده
منابع مشابه
Near - Infrared Spectroscopy of Molecular Hydrogen Emission in Four Reflection Nebulae : NGC 1333 , NGC 2023 , NGC 2068 , and NGC 7023
We present near-infrared spectroscopy of fluorescent molecular hydrogen (H2) emission from NGC 1333, NGC 2023, NGC 2068, and NGC 7023 and derive the physical properties of the molecular material in these reflection nebulae. Our observations of NGC 2023 and NGC 7023 and the physical parameters we derive for these nebulae are in good agreement with previous studies. Both NGC 1333 and NGC 2068 hav...
متن کاملPhysical Conditions in the Foreground Gas of Reflection Nebulae : NGC 2023 , vdB 102 , and NGC 7023
Guest Observer, McDonald Observatory, University of Texas at Austin. Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.
متن کاملNear - IR Fluorescent Molecular Hydrogen Emission from NGC 2023
Spectra from 1 to 2 ·5 μm, at 230–430 spectral resolution, are presented of the fluorescent molecular hydrogen line emission from two locations in the reflection nebula NGC 2023. Over 100 H2 lines can be identified in the spectra, although blending and poor atmospheric transmission mean that reliable level column densities can only be obtained from 35 lines. This latter group includes lines fro...
متن کاملPhysical Conditions in the Photodissociation Region of NGC 2023
Observations of the far-infrared ne-structure emission lines of OI] (63, 146 m), C II] (158 m), and Si II] (35 m) and the adjacent continua were obtained for the reeection nebula NGC 2023 with the Cryogenic Grating Spectrometer (CGS) aboard the Kuiper Airborne Observatory (KAO). These ne-structure lines originate from a warm, atomic photodissociation region (PDR), where gas has been heated by t...
متن کاملNear - Infrared Spectroscopy of Molecular Filaments in the Reflection Nebula NGC 7023 Paul Martini
We present near-infrared spectroscopy of fluorescent molecular hydrogen (H2) emission from molecular filaments in the reflection nebula NGC 7023. We derive the relative column densities of H2 rotational-vibrational states from the measured line emission and compare these results with several model photodissociation regions covering a range of densities, incident UV-fields, and excitation mechan...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/747/1/44