74 MHz Discrete HiiAbsorption Regions Toward the Inner Galaxy | Zendy

Michael E. Nord | Zendy; P. A. Henning | Zendy; Richard J. Rand | Zendy; T. Joseph W. Lazio | Zendy; N. E. Kassim | Zendy

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74 MHz Discrete HiiAbsorption Regions Toward the Inner Galaxy

Author(s) -

Michael E. Nord,

P. A. Henning,

Richard J. Rand,

T. Joseph W. Lazio,

N. E. Kassim

Publication year - 2006

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/504407

Subject(s) - physics , emissivity , astrophysics , surface brightness , galaxy , brightness , absorption (acoustics) , cosmic ray , brightness temperature , astronomy , angular resolution (graph drawing) , synchrotron , optics , mathematics , combinatorics

At low radio frequencies (< 100 MHz), classical HII regions may becomeoptically thick (optical depth > 1) and can be observed as discrete absorptionregions against the Galactic nonthermal background emission created by Galacticcosmic ray electrons spiraling around magnetic fields. In this work we present74 MHz observations in the region 26>l>-15, -5

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