A multifrequency radio continuum and IRAS faint source survey of markarian galaxies

Bicay, M. D.; Kojoian, G.; Seal, James; Dickinson, D. F.; Malkan, Matthew A.

doi:10.1086/192168

Cited by 52 publications

(46 citation statements)

References 1 publication

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“…We have detected a third of the total 6 cm single-dish Ñux of 23 mJy in Mrk 1089 (Bicay et al 1995), which implies that most of the 6 cm Ñux is extended on size scales greater than 30A. The 6/2 spectral index from our integrated Ñuxes of the compact emission from the galaxy is ]0.5, so it is dominated by optically thick emission.…”

Section: Meaning Of Rising Spectramentioning

confidence: 69%

“…The radio emission of starburst galaxies is an important diagnostic of the starburst and of other forms of galactic activity (see Klein & Emerson 1981 ;Turner & Ho 1983Deeg 1994 ;Bicay et al 1995 ;de Jong et al 1985 ;Wunderlich, Klein, & Wielebinski 1987 ;Duric et al 1986 ;Deeg, Duric, & Brinks 1997 and references therein for an overview of this use of the radio spectrum). Radio emission from starburst regions in external galaxies can be analyzed as a superposition of nonthermal synchrotron emission from supernovae and thermal emission from H II regions.…”

Section: Introductionmentioning

confidence: 99%

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High-Resolution Radio Maps of Wolf-Rayet Galaxies: Optically Thick H [CSC]ii[/CSC] Regions?

Beck

Turner

Kovo

2000

The Astronomical Journal

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We present 20, 6, 3.6, and 2 cm Very Large Array maps and continuum-free Ha images of nine WolfRayet galaxies. The radio maps were made with high spatial resolution to reject extended emission and to emphasize the star formation regions. The ratio of Ha to radio is at least a factor of 10 lower than predicted, indicating that the radio emission is from highly obscured sources. We map the radio spectral index, a across each galaxy. In all the sample galaxies except one, the radio spectrum is much (S l P la), Ñatter than in spiral starburst galaxies, suggesting that free-free emission is more dominant in the dwarfs and that these are very young starbursts that have produced few supernovae. In many of the galaxies, there are regions where the spectrum rises from 6 to 2 cm. This requires that the radio emission be optically thick at wavelengths as short as 2 cm. In these optically thick regions, the emission measure, electron density, and ionizing Ñuxes must be very high, and they are probably the youngest parts of the starburst. The deduced ionization of these sources implies stellar content of hundreds to many thousands of O stars, which means that they may be responsible for a signiÐcant fraction of the total infrared luminosities of the galaxies. We discuss what these sources imply for the history and evolution of the starburst in each galaxy.

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Section: Meaning Of Rising Spectramentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

High-Resolution Radio Maps of Wolf-Rayet Galaxies: Optically Thick H [CSC]ii[/CSC] Regions?

Beck

Turner

Kovo

2000

The Astronomical Journal

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“…In the last 30 years, the galaxy was observed several times in several radio bands, for example, the WSRT at 1.4 GHz (Meurs & Wilson 1981), VLA at 5 GHz (Ulvestad & Wilson 1984;Ulvestad et al 1995), and Green Bank telescope at 1.4 GHz (Bicay et al 1995). However, no extended emission was found.…”

Section: Mrk 783mentioning

confidence: 99%

Kiloparsec-scale emission in the narrow-line Seyfert 1 galaxy Mrk 783

Congiu

Berton

Giroletti

et al. 2017

A&A

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We present the first results of a radio survey of 79 narrow-line Seyfert 1 (NLS1) carried out with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A configuration aimed at studying the radio properties of these sources. We report the detection of extended emission in one object: Mrk 783. This is intriguing, since the radio-loudness parameter R of this object is close to the threshold between radio-quiet and radio-loud active galactic nuclei (AGN). The galaxy is one of the few NLS1 showing such an extended emission at z < 0.1. The radio emission is divided into a compact core component and an extended component, observed on both sides of the nucleus and extending from 14 kpc southeast to 12 kpc northwest. There is no sign of a collimated jet and the shape of the extended component is similar to those of some Seyfert galaxies. The properties of the emission are compatible with a relic produced by the intermittent activity cycle of the AGN.

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“…Similarly, Cicone et al (2014) reported the ratio of the kinetic energy of the outflow to the AGN bolometric luminosity in 14 low-z luminous AGNs (including ULIRGs) is up to 5%, also based on CO observations. The value of this ratio is close to predicted value from theoretical model for explaining the M BH − σ relation in local galaxies (e.g., Silk & Rees Weaver et al 2010;(8) Dasyra et al 2011;(9) Gallimore et al 2006;(10) 1.4 GHz data from Nagar et al 2005;(11) FIRST catalog (Faint Images of the Radio Sky at Twenty-cm); (12) Sramek 1975;(13) 4.89 GHz data from Laurent-Muehleisen et al 1997;(14) 1.4 GHz data from Condon et al 1998;(15) Bicay et al 1995;(16) Taylor et al 2006;(17) 4.89 GHz data from Ulvestad & Wilson 1984;(18) 4.85 GHz data from Gregory et al 1994;(19) de Vaucouleurs et al 1991, RC3 (Third Reference Catalog of Bright Galaxies), photographic magnitude; (20) 4680Å data from Petrosian et al 2007; (21) 1998; King 2010). Therefore, it is likely that powerful AGN-driven outflows can give impacts on NLR clouds and consequently cause fast shocks in NLRs.…”

Section: 4mentioning

confidence: 99%

Near-Infrared Spectroscopy of Nearby Seyfert Galaxies: Is There Evidence for Shock Excitation in Narrow-Line Regions?

Terao

Nagao

Hashimoto

et al. 2016

ApJ

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One of the unsettled, important problems in active galactic nuclei (AGNs) is the major ionization mechanism of gas clouds in their narrow-line regions (NLRs). In order to investigate this issue, we present our J-band spectroscopic observations for a sample of 26 nearby Seyfert galaxies. In our study, we use the flux ratio of the following two forbidden emission lines, [Fe ii]1.257µm and [P ii]1.188µm because it is known that this ratio is sensitive to the ionization mechanism. We obtain the [Fe ii]/[P ii] flux ratio or its lower limit for 19 objects. In addition to our data, we compile this flux ratio (or its lower limit) of 23 nearby Seyfert galaxies from the literature. Based on the collected data, we find that three Seyfert galaxies show very large lower limits of [Fe ii]/[P ii] flux ratios ( 10); NGC 2782, 5005, and Mrk 463. It is thus suggested that the contribution of the fast shock in the gas excitation is significantly large for them. However, more than half of Seyfert galaxies in our sample show moderate [Fe ii]/[P ii] flux ratios (∼2), that is consistent to the pure photoionization by power-law ionizing continuum emission. We also find that the [Fe ii]/[P ii] flux ratio shows no clear correlation with the radio loudness, suggesting that the radio jet is not the primary origin of shocks in NLRs of Seyfert galaxies.

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A multifrequency radio continuum and IRAS faint source survey of markarian galaxies

Cited by 52 publications

References 1 publication

High-Resolution Radio Maps of Wolf-Rayet Galaxies: Optically Thick H [CSC]ii[/CSC] Regions?

High-Resolution Radio Maps of Wolf-Rayet Galaxies: Optically Thick H [CSC]ii[/CSC] Regions?

Kiloparsec-scale emission in the narrow-line Seyfert 1 galaxy Mrk 783

Near-Infrared Spectroscopy of Nearby Seyfert Galaxies: Is There Evidence for Shock Excitation in Narrow-Line Regions?

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