On the radio and near-infrared hydrogen recombination-line emission from M82

1980 ◽  
Vol 238 ◽  
pp. 41 ◽  
Author(s):  
L. F. Rodriguez ◽  
E. J. Chaisson
Keyword(s):  
Near Infrared ◽  
Line Emission ◽  
Recombination Line ◽  
Hydrogen Recombination

Observations of infrared hydrogen recombination line emission from external galaxies

1984 ◽  
Vol 279 ◽  
pp. 563 ◽  
Author(s):  
S. C. Beck ◽  
S. Beckwith ◽  
I. Gatley
Keyword(s):  
Line Emission ◽  
Recombination Line ◽  
Hydrogen Recombination ◽  
External Galaxies

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 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

Radio Recombination Line Emission from Ultracompact HII Regions

1990 ◽  
pp. 83-92 ◽  
Author(s):  
E. Churchwell ◽  
C. M. Walmsley ◽  
D. O. S. Wood ◽  
H. Steppe
Keyword(s):  
Line Emission ◽  
Hii Regions ◽  
Recombination Line ◽  
Radio Recombination Line ◽  
Ultracompact Hii

scholarly journals Flybys in protoplanetary discs – II. Observational signatures

2019 ◽  
Vol 491 (1) ◽  
pp. 504-514 ◽  
Author(s):  
Nicolás Cuello ◽  
Fabien Louvet ◽  
Daniel Mentiplay ◽  
Christophe Pinte ◽  
Daniel J Price ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Near Infrared ◽  
Scattered Light ◽  
Line Emission ◽  
Star Clusters ◽  
Post Process ◽  
Accretion Rates ◽  
Fu Ori ◽  
Hydrodynamical Simulations ◽  
Multiwavelength Observations

ABSTRACT Tidal encounters in star clusters perturb discs around young protostars. In Cuello et al., we detailed the dynamical signatures of a stellar flyby in both gas and dust. Flybys produce warped discs, spirals with evolving pitch angles, increasing accretion rates, and disc truncation. Here, we present the corresponding observational signatures of these features in optical/near-infrared scattered light and (sub) millimetre continuum and CO line emission. Using representative prograde and retrograde encounters for direct comparison, we post-process hydrodynamical simulations with radiative transfer methods to generate a catalogue of multiwavelength observations. This provides a reference to identify flybys in recent near-infrared and submillimetre observations (e.g. RW Aur, AS 205, HV Tau and DO Tau, FU Ori, V2775 Ori, and Z CMa).

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*.

A Search for Deuterium Recombination-Line Emission from Orion a

1973 ◽  
Vol 184 ◽  
pp. 397 ◽  
Author(s):  
Diego A. Cesarsky
Keyword(s):  
Line Emission ◽  
Recombination Line

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

scholarly journals Near-infrared observations of star formation and gas flows in the NUGA galaxy NGC 1365

2019 ◽  
Vol 622 ◽  
pp. A128 ◽  
Author(s):  
Nastaran Fazeli ◽  
Gerold Busch ◽  
Mónica Valencia-S. ◽  
Andreas Eckart ◽  
Michal Zajaček ◽  
...  
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Galaxy Evolution ◽  
Large Scale ◽  
Near Infrared ◽  
Molecular Gas ◽  
Nuclear Region ◽  
Stellar Kinematics ◽  
Hydrogen Recombination ◽  
Ngc 1365

In the framework of understanding the gas and stellar kinematics and their relations to AGNs and galaxy evolution scenarios, we present spatially resolved distributions and kinematics of the stars and gas in the central ∼800 pc radius of the nearby Seyfert galaxy NGC 1365. We obtained H + K- and K-band near-infrared (NIR) integral-field observations from VLT/SINFONI. Our results reveal strong broad and narrow emission-line components of ionized gas (hydrogen recombination lines Paα and Brγ) in the nuclear region, as well as hot dust with a temperature of ∼1300 K, both typical for type-1 AGNs. From MBH − σ* and the broad components of hydrogen recombination lines, we find a black-hole mass of (5 − 10)×106 M⊙. In the central ∼800 pc, we find a hot molecular gas mass of ∼615 M⊙, which corresponds to a cold molecular gas reservoir of (2 − 8)×108 M⊙. However, there is a molecular gas deficiency in the nuclear region. The gas and stellar-velocity maps both show rotation patterns consistent with the large-scale rotation of the galaxy. However, the gaseous and stellar kinematics show deviations from pure disk rotation, which suggest streaming motions in the central < 200 pc and a velocity twist at the location of the ring which indicates deviations in disk and ring rotation velocities in accordance with published CO kinematics. We detect a blueshifted emission line split in Paα, associated with the nuclear region only. We investigate the star-formation properties of the hot spots in the circumnuclear ring which have starburst ages of ≲10 Myr and find indications for an age gradient on the western side of the ring. In addition, our high-resolution data reveal further substructure within this ring which also shows enhanced star forming activity close to the nucleus.

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