scholarly journals A spatially resolved radio spectral index study of the dwarf irregular galaxy NGC 1569

2018 ◽  
Vol 475 (4) ◽  
pp. 5116-5132
Author(s):  
Jonathan Westcott ◽  
Elias Brinks ◽  
Luke Hindson ◽  
Robert Beswick ◽  
Volker Heesen
Keyword(s):  
Spectral Index ◽  
Irregular Galaxy ◽  
Spatially Resolved ◽  
Index Study ◽  
Ngc 1569

scholarly journals THE ROLE OF THE MAGNETIC FIELD IN THE INTERSTELLAR MEDIUM OF THE POST-STARBURST DWARF IRREGULAR GALAXY NGC 1569

2010 ◽  
Vol 712 (1) ◽  
pp. 536-557 ◽  
Author(s):  
Amanda A. Kepley ◽  
Stefanie Mühle ◽  
John Everett ◽  
Ellen G. Zweibel ◽  
Eric M. Wilcots ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Interstellar Medium ◽  
Irregular Galaxy ◽  
The Magnetic Field ◽  
Ngc 1569

scholarly journals A LOFAR-uGMRT spectral index study of distant radio halos

2021 ◽  
Author(s):  
G. Di Gennaro ◽  
R. J. van Weeren ◽  
R. Cassano ◽  
G. Brunetti ◽  
M. Brüggen ◽  
...  
Keyword(s):  
Spectral Index ◽  
Index Study ◽  
Radio Halos

scholarly journals A Nonthermal Superbubble in the Irregular Galaxy IC 10

1988 ◽  
Vol 101 ◽  
pp. 465-467
Author(s):  
Evan D. Skillman
Keyword(s):  
High Resolution ◽  
Spectral Index ◽  
Supernova Remnant ◽  
Radio Continuum ◽  
Irregular Galaxy ◽  
Large Size ◽  
Ic 10

AbstractNew high resolution radio continuum images of the nearby irregular galaxy IC 10 have revealed a large (> 250 pc) nonthermal source. The source is roughly circular with a spectral index of ∼ –0.5, and is most likely a very large supernova remnant. Its large size suggests that it is the result of several supernovae, and may be related to the supershells observed in our own and other galaxies.

scholarly journals THE STELLAR AND GAS KINEMATICS OF THE LITTLE THINGS DWARF IRREGULAR GALAXY NGC 1569

2012 ◽  
Vol 144 (5) ◽  
pp. 152 ◽  
Author(s):  
Megan Johnson ◽  
Deidre A. Hunter ◽  
Se-Heon Oh ◽  
Hong-Xin Zhang ◽  
Bruce Elmegreen ◽  
...  
Keyword(s):  
Irregular Galaxy ◽  
Gas Kinematics ◽  
Ngc 1569

scholarly journals Aperture Synthesis Observations of the Supernova Remnant G73.9+0.9

1988 ◽  
Vol 101 ◽  
pp. 297-300
Author(s):  
P. Chastenay ◽  
S. Pineault
Keyword(s):  
Spectral Index ◽  
Supernova Remnant ◽  
Aperture Synthesis ◽  
Radio Continuum ◽  
General Morphology ◽  
Spatially Resolved ◽  
A Value ◽  
Shell Type

AbstractRadio continuum observations, obtained with the DRAO Synthesis Telescope, are presented of the new supernova remnant (SNR) G73.9+0.9. Our map at 1420 MHz shows indications of spatially resolved knots of emission in the brightest part of the remnant. The 408 MHz map, although of lower resolution, shows the same general morphology. The spectral index α (Sv∝v−α) between 1420 and 408 MHz is about 0.5, a value typical for shell type SNRs. The morphology however is more suggestive of a filled centre SNR.

The spectral index study for Fermi blazars

2021 ◽  
Vol 366 (1) ◽  
Author(s):  
Zhihao Ouyang ◽  
Hubing Xiao ◽  
Yini Zheng ◽  
Peishan Xu ◽  
Junhui Fan
Keyword(s):  
Spectral Index ◽  
Index Study

scholarly journals Radio observations and spectral index study of the SNR G126.2+1.6

2006 ◽  
Vol 447 (1) ◽  
pp. 205-211 ◽  
Author(s):  
W. W. Tian ◽  
D. A. Leahy
Keyword(s):  
Spectral Index ◽  
Radio Observations ◽  
Index Study

scholarly journals The Star Clusters in the Starburst Irregular Galaxy NGC 1569

2000 ◽  
Vol 120 (5) ◽  
pp. 2383-2401 ◽  
Author(s):  
Deidre A. Hunter ◽  
Robert W. O’Connell ◽  
J. S. Gallagher ◽  
Tammy A. Smecker-Hane
Keyword(s):  
Star Clusters ◽  
Irregular Galaxy ◽  
Ngc 1569

scholarly journals (1) Radio spectral index variations of the SNR HB3 (2) Radio spectral index study of the SNRs OA184 and VRO42.05.01

2006 ◽  
Vol 451 (3) ◽  
pp. 991-991 ◽  
Author(s):  
W. W. Tian ◽  
D. A. Leahy
Keyword(s):  
Spectral Index ◽  
Index Study

scholarly journals Narrow-Line Seyfert 1 Galaxies With Absorbed Jets–Insights From Radio Spectral Index Maps

2021 ◽  
Vol 8 ◽  
Author(s):  
Emilia Järvelä ◽  
Marco Berton ◽  
Luca Crepaldi
Keyword(s):  
Radio Emission ◽  
Spectral Index ◽  
Large Scale ◽  
Wide Frequency Range ◽  
Narrow Line ◽  
Host Galaxies ◽  
Relativistic Jets ◽  
Additional Information ◽  
Spatially Resolved ◽  
Index Maps

Narrow-line Seyfert 1 (NLS1) galaxies are active galactic nuclei (AGN) believed to be in the early stages of their evolution. A fraction of them have been found to host relativistic jets. Due to the lack of large-scale diffuse radio emission they are believed to be experiencing one of their first activity cycles, and can offer us an opportunity to study the early evolution of more powerful AGN, such as radio galaxies and flat-spectrum radio quasars. Recently, a group of intriguing jetted NLS1s was discovered: based on high radio frequency data they host relativistic jets, but in the JVLA observations they all showed steep radio spectra at least up to 9.0 GHz, indicating very strong absorption at these frequencies. In this paper we study a subset of these sources in detail by employing spatially resolved radio spectral index maps at central frequencies of 1.6, 5.2, and 9.0 GHz. With spectral index maps we can disentangle the different radio emission components over the radio-emitting region, and get insights into the production mechanisms of radio emission. In addition, we study their host galaxies in relation to the radio emission to investigate if the host can provide us additional information regarding the origin of the radio emission, or the launching mechanism of the jets. It is fascinating how different the sources studied are, and certainly more, especially wide frequency-range, and high-resolution observations will be needed to understand their history and current properties, such as the reason behind the extraordinary radio spectra.

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