Extended soft x-ray source in Delphinus: H2027+19

Journal Article · Sun Jun 01 00:00:00 EDT 1980 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/183262· OSTI ID:5097057

Stern, R A; Charles, P A; Walker, B C; Nugent, J J; Garmire, G P

We report the detection of an extended (approx.3/sup 0/) source of soft X-ray emission. H2027+19, observed with the HEAO 1 A-2 experiment. The object emits primarily in the 0.16--0.4 keV band, with a total flux in this band of approx.2 x 10/sup -11/ ergs cm/sup -2/ S/sup -1/. Although our data can be formally modeled with two discrete sources, a detailed analysis suggests that this alternative is not likely to be the case. We fine that both simple continuum and coronal plasma models provide good fits to the observed pulse-height spectrum. The source parameters are restricted to 10/sup 5.8/ <10/sup 6.5/K, N/sub x/<10/sup 21.3/ cm/sup -2/ (Raymond and Smith plasma), and 10/sup 5.8/<10/sup 7.0/, N/sub x/<10/sup 21.2/ (exponential+Gaunt factor) at the 90% confidence level. The most likely physical models are either that the source is an old supernova remnant or that it is a region of enhanced soft X-ray emission surrounding an H I cloud imbedded in a cornal plasma, as suggested by Hayakawa et al. for the Lupus Loop.

• Research Organization: Institute of Plasma Research and Department of Applied Physics, Stanford University
• OSTI ID: 5097057
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Vol. 238:2
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC X-RAY SOURCES
X-RAY SPECTRA
H1 REGIONS
SUPERNOVA REMNANTS
EMISSION SPECTRA
EXPERIMENTAL DATA
SOFT X RADIATION
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
DATA
ELECTROMAGNETIC RADIATION
INFORMATION
IONIZING RADIATIONS
NUMERICAL DATA
RADIATIONS
SPECTRA
X RADIATION
640103* - Astrophysics &amp; Cosmology- Quasi-Stellar
Radio
&amp; X-Ray Sources- (-1987)