scholarly journals Mid-Infrared Hydrogen Recombination Line Emission From the Maser Star MWC 349A

1997 ◽  
Vol 114 ◽  
pp. 2658 ◽  
Author(s):  
Howard A. Smith ◽  
V. Strelnitski ◽  
J. W. Miles ◽  
D. M. Kelly ◽  
J. H. Lacy
Keyword(s):  
Line Emission ◽  
Recombination Line ◽  
Mid Infrared ◽  
Hydrogen Recombination

scholarly journals Two New Recombination-Line Results

1974 ◽  
Vol 60 ◽  
pp. 81-85
Author(s):  
F. J. Kerr ◽  
P. D. Jackson ◽  
G. R. Knapp ◽  
R. L. Brown
Keyword(s):  
Line Emission ◽  
Recombination Line ◽  
Ionized Gas ◽  
Dark Cloud ◽  
Hydrogen Recombination

This paper reports two new recombination-line results. The first is the detection of carbon line emission from the dark cloud near ϱ Ophiuchi, and the second discusses the origin of hydrogen recombination line emission associated with ionized gas outside known discrete continuum sources.

scholarly journals 3.2. ISO spectroscopy of the Galactic center and starburst nuclei

1998 ◽  
Vol 184 ◽  
pp. 91-92 ◽  
Author(s):  
D. Lutz
Keyword(s):  
Galactic Center ◽  
Galactic Nuclei ◽  
Recombination Line ◽  
Infrared Space Observatory ◽  
Deep Minimum ◽  
Mid Infrared ◽  
Hydrogen Recombination ◽  
External Galaxies ◽  
Infrared Extinction

Since its launch in November 1995, the Infrared Space Observatory ISO has converted mid-infrared spectroscopy into a mature tool. Due to its proximity, brightness, and the wealth of complementary information, the center of our Galaxy remains a unique testbed for studies of galactic nuclei. A first analysis of the 2.4-45μm spectrum obtained with ISO-SWS (Fig. 1) has been presented by Lutz et al. (1996a). One of the surprises is a determination of the mid-infrared extinction law from comparison of the Galactic center hydrogen recombination line fluxes and case B expectations: The extinction law clearly lacks the deep minimum near 7μm expected for standard graphite/silicate mixes. External galaxies are less close to the ideal ‘screen’ case and cannot provide the detail of the GC recombination line spectrum needed to derive an extinction law. However, simple ratios of the strongest recombination lines are inconsistent with a classical extinction law and any dust configuration.

scholarly journals Probing Sagittarius A* accretion with ALMA

2016 ◽  
Vol 11 (S322) ◽  
pp. 21-24
Author(s):  
Elena Murchikova
Keyword(s):  
Galactic Center ◽  
Accretion Rate ◽  
Recombination Line ◽  
Ionized Gas ◽  
X Ray ◽  
Sagittarius A ◽  
Hydrogen Recombination ◽  
Unique Probe ◽  
Cool Gas

AbstractThe submm Hydrogen recombination line technique can be used as a probe of the Galactic Center. We present the results of our H30α observations of ionized gas from within 0.015 pc around SgrA*. The observations were obtained on ALMA in cycle 3. The line was not detected, but we were able to set a limit on the mass of the cool gas (T~ 104 K) at 2 × 10−3M⊙. This is the unique probe of gas cooler than T ~106 K traced by X-ray emission. The total amount of gas near SgrA* gives us clues to understanding the accretion rate of SgrA*.

Observations of Recombination-Line Emission in the Direction of Two Supernova Remnants

1973 ◽  
Vol 183 ◽  
pp. L143 ◽  
Author(s):  
Diego A. Cesarsky ◽  
Catherine J. Cesarskly
Keyword(s):  
Supernova Remnants ◽  
Line Emission ◽  
Recombination Line

An Attempt to Detect Recombination Line Emission from the Cygnus X-3 Outburst

1972 ◽  
Vol 239 (95) ◽  
pp. 126-126 ◽  
Author(s):  
B. G. LESLIE ◽  
W. A. DENT
Keyword(s):  
Line Emission ◽  
Recombination Line
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