The surface brightness of spiral galaxies – IV. Correlations with far-infrared emission

1988 ◽  
Vol 231 (2) ◽  
pp. 359-366 ◽  
Author(s):  
Steven Phillipps ◽  
Michael Disney
Keyword(s):  
Surface Brightness ◽  
Spiral Galaxies ◽  
Far Infrared ◽  
Infrared Emission

scholarly journals 7.9. Far-infrared emission and gas to dust ratio in discs and central regions of galaxies

1998 ◽  
Vol 184 ◽  
pp. 309-310
Author(s):  
Y.D. Mayya ◽  
T.N. Rengarajan
Keyword(s):  
Spiral Galaxies ◽  
Radial Profile ◽  
Neutral Hydrogen ◽  
Far Infrared ◽  
Infrared Emission ◽  
Profile Data ◽  
V Band ◽  
Ngc 6946 ◽  
Radial Profiles ◽  
Central Regions

We study the radial profiles of radio comtinuum (RC) and far-infrared (FIR) emissions and also the gas to dust ratio for a sample of 22 spiral galaxies. For this, we use the data from IRAS HiRES FIR maps, available VLA 20 cm maps and radial profile data available on neutral hydrogen (H) and molecular hydrogen (H2, derived from velocity integrated CO intensity). In order to have enough resolution with the 1-1.5 arcminute IRAS beam, the galaxies chosen were large sized and had a 60 μm flux density of more than 5 Jy. The sample consists of: NGC 628, NGC 2403, NGC 2841, NGC 2903, NGC 3079, NGC 3198, NGC 3627, NGC 3628, NGC 4192, NGC 4254, NGC 4303, NGC 4321, NGC 4501, NGC 4535, NGC 4569, NGC 4656, NGC 4736, NGC 5033, NGC 5055, NGC 6503, NGC 6946 and NGC 7331. For 13 of these galaxies information is also available on metallicity (z) and V band CCD maps.

scholarly journals Modelling the ArH+ emission from the Crab nebula

2017 ◽  
Vol 472 (4) ◽  
pp. 4444-4455 ◽  
Author(s):  
F. D. Priestley ◽  
M. J. Barlow ◽  
S. Viti
Keyword(s):  
Surface Brightness ◽  
Crab Nebula ◽  
Dissociative Recombination ◽  
Cosmic Ray ◽  
Far Infrared ◽  
Ionization Rate ◽  
Infrared Emission ◽  
Upper Limits ◽  
Vibration Rotation ◽  
The Crab Nebula

Abstract We have performed combined photoionization and photodissociation region (PDR) modelling of a Crab nebula filament subjected to the synchrotron radiation from the central pulsar wind nebula, and to a high flux of charged particles; a greatly enhanced cosmic-ray ionization rate over the standard interstellar value, ζ0, is required to account for the lack of detected [C i] emission in published Herschel SPIRE FTS observations of the Crab nebula. The observed line surface brightness ratios of the OH+ and ArH+ transitions seen in the SPIRE FTS frequency range can only be explained with both a high cosmic-ray ionization rate and a reduced ArH+ dissociative recombination rate compared to that used by previous authors, although consistent with experimental upper limits. We find that the ArH+/OH+ line strengths and the observed H2 vibration–rotation emission can be reproduced by model filaments with nH = 2 × 104 cm−3, ζ = 107ζ0 and visual extinctions within the range found for dusty globules in the Crab nebula, although far-infrared emission from [O i] and [C ii] is higher than the observational constraints. Models with nH = 1900 cm−3 underpredict the H2 surface brightness, but agree with the ArH+ and OH+ surface brightnesses and predict [O i] and [C ii] line ratios consistent with observations. These models predict HeH+ rotational emission above detection thresholds, but consideration of the formation time-scale suggests that the abundance of this molecule in the Crab nebula should be lower than the equilibrium values obtained in our analysis.

Far-infrared emission and star formation in spiral galaxies

1989 ◽  
Vol 342 ◽  
pp. 759 ◽  
Author(s):  
G. Trinchieri ◽  
G. Fabbiano ◽  
R. Bandiera
Keyword(s):  
Star Formation ◽  
Spiral Galaxies ◽  
Far Infrared ◽  
Infrared Emission

scholarly journals The far-infrared view of M87 as seen by the Herschel Space Observatory

2010 ◽  
Vol 6 (S275) ◽  
pp. 145-149
Author(s):  
M. Baes ◽  
M. Clemens ◽  
E. M. Xilouris ◽  
J. Fritz ◽  
W. D. Cotton ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Radio Galaxy ◽  
Dust Emission ◽  
Far Infrared ◽  
Infrared Emission ◽  
Virgo Cluster ◽  
Synchrotron Emission ◽  
Space Observatory ◽  
Infrared Excess ◽  
Dust Component

AbstractThe origin of the far-infrared emission from the nearby radio galaxy M87 remains a matter of debate. Some studies find evidence of a far-infrared excess due to thermal dust emission, whereas others propose that the far-infrared emission can be explained by synchrotron emission without the need for an additional dust emission component. We observed M87 with PACS and SPIRE as part of the Herschel Virgo Cluster Survey (HeViCS). We compare the new Herschel data with a synchrotron model based on infrared, submm and radio data to investigate the origin of the far-infrared emission. We find that both the integrated SED and the Herschel surface brightness maps are adequately explained by synchrotron emission. At odds with previous claims, we find no evidence of a diffuse dust component in M87.

scholarly journals Intracluster Dust and Far Infrared Emission

2001 ◽  
Vol 204 ◽  
pp. 67-67
Author(s):  
Cristina C. Popescu ◽  
Richard J. Tuffs ◽  
Jörg Fischera ◽  
Heinrich Völk
Keyword(s):  
Spiral Galaxies ◽  
Dust Emission ◽  
Cosmic Ray ◽  
Far Infrared ◽  
Infrared Emission ◽  
Discrete Source ◽  
Injection Rate ◽  
Virgo Cluster ◽  
Optical Extinction ◽  
Young Clusters

We make predictions for the diffuse far-infrared (FIR) emission from dust in the intracluster medium (ICM) of the Virgo cluster. The dust injection rate from known sources in the cluster is unlikely to give rise to a detectable diffuse FIR IC emission. However, the outer regions of dynamically young clusters have a further potential source of IC grains since they are still accreting freshly infalling spiral galaxies which are presumably contained in an accreting intergalactic medium (IGM). We show that cosmic ray driven winds from the infalling spirals can inject grains into a subvirial IGM that is external to the observed X-ray-emitting ICM. Predictions for the Virgo cluster are generalised to other clusters, and the possibility of detection of dynamically young clusters at cosmological distances is discussed. Although dominated by the discrete source emission from galactic disks, it is possible that diffuse submillimeter dust emission from the ICM could be detected in experiments similar to those designed to map the submillimeter excess due to the Sunyaev-Zeldovich effect in distant clusters. We further discuss the implications of our proposed scenario for the optical extinction in clusters, as well as for the properties and dust content of the IGM. Further implications for the environmental effects on the chemical evolution of spiral galaxies are also considered.

Far infrared emission from magnetically quantised 2DEGs in GaAs/(AlGa)As heterojunctions

1994 ◽  
Vol 305 (1-3) ◽  
pp. 280-284 ◽  
Author(s):  
N.N. Zinov'ev ◽  
R. Fletcher ◽  
L.J. Challis ◽  
B. Sujak-Cyrul ◽  
A.V. Akimov ◽  
...  
Keyword(s):  
Far Infrared ◽  
Infrared Emission

scholarly journals Far-Infrared Emission from Clumpy Irregular Galaxies

1987 ◽  
Vol 115 ◽  
pp. 647-647
Author(s):  
U. Klein ◽  
J. Heidmann ◽  
R. Wielebinski ◽  
E. Wunderlich
Keyword(s):  
Star Formation ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Hubble Constant ◽  
Far Infrared ◽  
Hii Regions ◽  
Infrared Emission ◽  
Star Forming ◽  
Irregular Galaxies

The four clumpy irregular galaxies Mkr 8, 296,297 and 325 have been observed by IRAS. All galaxies have been detected in at least two of the four detector bands. The ratios of the 100 to 60-m flux densities are comparable to those of HII regions or violently star forming galaxies. The average star formation rate in clumpy irregular galaxies is of the order of a few solar masses per year (based on their average far-infrared luminosity and a Hubble constant of 75 km s−1 Mpc−1.

Energy Sources of the Far‐Infrared Emission of M33

2004 ◽  
Vol 154 (1) ◽  
pp. 259-265 ◽  
Author(s):  
J. L. Hinz ◽  
G. H. Rieke ◽  
K. D. Gordon ◽  
P. G. Perez‐Gonzalez ◽  
C. W. Engelbracht ◽  
...  
Keyword(s):  
Far Infrared ◽  
Infrared Emission ◽  
Energy Sources
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