scholarly journals An Infrared Emission‐Line Galaxy atz= 2.43

1998 ◽  
Vol 504 (1) ◽  
pp. 107-112 ◽  
Author(s):  
S. V W. Beckwith ◽  
D. Thompson ◽  
F. Mannucci ◽  
S. G. Djorgovski
Keyword(s):  
Emission Line ◽  
Infrared Emission ◽  
Line Galaxy

scholarly journals Exploring the link between C IV outflow kinematics and sublimation-temperature dust in quasars

2020 ◽  
Author(s):  
Matthew J Temple ◽  
Manda Banerji ◽  
Paul C Hewett ◽  
Amy L Rankine ◽  
Gordon T Richards
Keyword(s):  
Emission Line ◽  
High Frequency ◽  
Infrared Emission ◽  
Black Hole Mass ◽  
Sublimation Temperature ◽  
Continuum Source ◽  
Broad Emission ◽  
Line Region ◽  
Using Data

Abstract Using data from SDSS, UKIDSS and WISE, we investigate the properties of the high-frequency cutoff to the infrared emission in ≃5000 carefully selected luminous (Lbol ∼ 1047) type 1 quasars. The strength of ≃2 μm emission, corresponding to emission from the hottest ($T>1200\rm \, K$) dust in the sublimation zone surrounding the central continuum source, is observed to correlate with the blueshift of the C iv λ1550 emission line. We therefore find that objects with stronger signatures of nuclear outflows tend to have a larger covering fraction of sublimation-temperature dust. When controlling for the observed outflow strength, the hot dust covering fraction does not vary significantly across our sample as a function of luminosity, black hole mass or Eddington fraction. The correlation between the hot dust and the C iv line blueshifts, together with the lack of correlation between the hot dust and other parameters, therefore provides evidence of a link between the properties of the broad emission line region and the infrared-emitting dusty regions in quasars.

scholarly journals The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: final emission line galaxy target selection

2017 ◽  
Vol 471 (4) ◽  
pp. 3955-3973 ◽  
Author(s):  
A. Raichoor ◽  
J. Comparat ◽  
T. Delubac ◽  
J.-P. Kneib ◽  
Ch Yèche ◽  
...  
Keyword(s):  
Emission Line ◽  
Target Selection ◽  
Line Galaxy

scholarly journals An Emission-Line Galaxy Survey with the UK Schmidt Telescope

1987 ◽  
Vol 121 ◽  
pp. 53-55
Author(s):  
M. Kalafi ◽  
A. Savage ◽  
A.R. Good ◽  
R.D. Cannon ◽  
M.G. Yates
Keyword(s):  
Emission Line ◽  
Large Scale ◽  
Preliminary Investigation ◽  
Schmidt Telescope ◽  
Large Area ◽  
Number Magnitude ◽  
Emission Line Galaxies ◽  
Galaxy Populations ◽  
The Uk ◽  
Line Galaxy

The use of objective prisms in conjunction with the large area coverage afforded by Schmidt telescopes provides a very powerful means of detecting large numbers of emission-line galaxies, and allows one to study their large scale distribution. An important question that has yet to be fully addressed is the relationship between the number-magnitude distributions of the normal field galaxy and emission-line galaxy populations. A comparison such as this would effectively probe the evolution with time of these active objects. For example, study of the distant (z = 0.458) cluster of galaxies associated with 3C 295 (Dressler & Gunn 1983) indicates that emission-line objects may have been far more numerous in the past than at present. As a preliminary investigation in advance of a larger project, we report here on a search for emission-line galaxies in four United Kingdom 1.2m Schmidt Telescope (UKST) objective prism fields.

scholarly journals H2 and HI Emission Line Imaging of the Ring Nebula NGC 6720

1989 ◽  
Vol 131 ◽  
pp. 170-170
Author(s):  
M. A. Greenhouse ◽  
T. L. Hayward ◽  
H. A. Thronson
Keyword(s):  
Emission Line ◽  
Atomic Hydrogen ◽  
Molecular Hydrogen ◽  
Angular Resolution ◽  
Infrared Emission ◽  
Stellar Winds ◽  
Recombination Line ◽  
Ring Nebula ◽  
Line Imaging ◽  
Spatial Stratification

We present infrared emission line images of the v = 1 → 0 S(1) transition of molecular hydrogen and Brγ recombination line of atomic hydrogen which cover the entire extent of NGC 6720, the Ring Nebula. The maps presented here are the highest angular resolution images of these transitions yet produced for this object, and have very low relative positional uncertainty. As a result, we clearly resolve the spatial stratification of the ionized and shocked molecular zones within the nebula discussed previously by Beckwith et al. (1978). The relative spatial distribution of molecular and ionized hydrogen we observe is typical of several planetaries which exhibit shocked H2 emission (eg. see Zuckerman and Gatley 1987), and is similar to that predicted by the interacting-stellar-winds model of planetary nebulae formation (see Volk and Kwok 1985 and references therein).

scholarly journals Understanding the Nebular Spectrum of SN 1987A

1996 ◽  
Vol 145 ◽  
pp. 223-234
Author(s):  
Richard McCray
Keyword(s):  
Emission Line ◽  
Infrared Emission ◽  
Emission Lines ◽  
Low Density ◽  
Simple Method ◽  
Sn 1987A ◽  
Hydrogen Recombination ◽  
Inner Envelope

The nebular spectra of supernovae differ from those of better-known emission nebulae in that many of the emission lines are optically thick. Here we sketch the theory for interpreting such spectra, and show how it can be used to interpret prominent emission line systems in the spectrum of SN 1987A. As examples, we describe: (1) a simple method to infer the density of OI from observations of the evolution of the doublet ratio in [O I]λλ6300; (2) new kind of hydrogen recombination hne spectrum; (3) an analysis showing that the Call infrared emission lines must come from primordial, not newly-synthesized, calcium; (4) a theory for the Fe/Co/Ni emission lines that shows that the inner envelope of SN 1987A must have a foamy texture, in which low density radioactive bubbles of Fe/Co/Ni reside in a massive substrate of hydrogen, helium, and other elements.

Spectroscopy of KISS Emission-Line Galaxy Candidates. III. A Second Set of MDM Observations

2005 ◽  
Vol 130 (2) ◽  
pp. 496-505 ◽  
Author(s):  
Anna Jangren ◽  
Gary Wegner ◽  
John J. Salzer ◽  
Jessica K. Werk ◽  
Caryl Gronwall
Keyword(s):  
Emission Line ◽  
Line Galaxy

scholarly journals The Far‐Infrared Emission Line and Continuum Spectrum of the Seyfert Galaxy NGC 1068

2005 ◽  
Vol 623 (1) ◽  
pp. 123-136 ◽  
Author(s):  
Luigi Spinoglio ◽  
Matthew A. Malkan ◽  
Howard A. Smith ◽  
Eduardo Gonzalez‐Alfonso ◽  
Jacqueline Fischer
Keyword(s):  
Emission Line ◽  
Seyfert Galaxy ◽  
Far Infrared ◽  
Infrared Emission ◽  
Continuum Spectrum ◽  
Ngc 1068

Spectroscopy of KISS Emission-Line Galaxy Candidates. II. Hobby-Eberly Telescope Observations

2004 ◽  
Vol 128 (2) ◽  
pp. 644-661 ◽  
Author(s):  
Caryl Gronwall ◽  
Anna Jangren ◽  
John J. Salzer ◽  
Jessica K. Werk ◽  
Robin Ciardullo
Keyword(s):  
Emission Line ◽  
Line Galaxy

scholarly journals SPATIALLY RESOLVEDHSTGRISM SPECTROSCOPY OF A LENSED EMISSION LINE GALAXY ATz∼ 1

2012 ◽  
Vol 754 (1) ◽  
pp. 17 ◽  
Author(s):  
Brenda L. Frye ◽  
Mairead Hurley ◽  
David V. Bowen ◽  
Gerhardt Meurer ◽  
Keren Sharon ◽  
...  
Keyword(s):  
Emission Line ◽  
Line Galaxy
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