The nuclear activity of interacting galaxies

Dahari, O.

doi:10.1086/191021

Cited by 154 publications

(106 citation statements)

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“…In order to do this we have used the information from references quoted in Sect. 2 and the following ones, which were useful for classification according to stellar population and/or emitting gas characteristics: Heckman et al (1980);Caldwell (1984); Dahari (1985); Filippenko & Sargent (1985); Bica & Alloin (1987a,b); Davies et al (1987); Bettoni & Buson (1987); Gregg (1989); Bonatto et al (1989);Terlevich et al (1991);Bica et al (1991); Buson et al (1993); Osterbrock & Martel (1993); Goudfrooij et al (1994);Gelderman & Whittle (1994); Storchi-Bergmann et al (1995).…”

Section: Spectral Groupsmentioning

confidence: 99%

Ultraviolet properties of early-type galaxies

Bonatto

Bica

Pastoriza

et al. 1996

Astron. Astrophys. Suppl. Ser.

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Abstract. -We analyse the UV properties of early-type galaxies from their UV spectra in the IUE library, including both normal and active nuclei. We co-added the spectra, and hence the objects into groups of similar spectral properties in the UV, also taking into account their properties in the visible/near-infrared ranges. Although, owing to the presence of a residual fixed pattern noise, IUE data cannot be improved by co-addition as expected for spectra containing only random noise, this procedure still provided spectra of higher signal/noise ratio than in previous studies, often based on individual spectra and therefrom derived colour indices. Thanks to the co-adding procedure, information on spectral features can now be assessed. The red stellar population groups exhibit a far-UV flux at different levels. The higher ones denote the presence of the UV turnup, which possibly exhibits absorption features, at least as detected through the IUE aperture. As to the blue stellar population groups and/or AGNs, we have carried out simple syntheses with UV star cluster templates and galaxy spectra in order to infer the properties such as burst ages and contamination by an active nucleus. It has been possible to derive information on the extinction law affecting some internally reddened galaxies; there are cases where the presence of the λ2200Å absorption feature suggests a reddening law similar to the Galactic one, and others without the λ2200Å feature, suggesting that it is rather an SMC type law which applies, then.

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Section: Spectral Groupsmentioning

confidence: 99%

Ultraviolet properties of early-type galaxies

Bonatto

Bica

Pastoriza

et al. 1996

Astron. Astrophys. Suppl. Ser.

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“…They present a bar with 3 nearly aligned bright clumps. The nature of one of them, galactic nuclei or a foreground star, is debated in the literature (Chincarini & Heckathorn 1973;Dahari 1985). Prominent dust lanes are visible north of the bar.…”

Section: Introductionmentioning

confidence: 99%

Studying the spatially resolved Schmidt-Kennicutt law in interacting galaxies: the case of Arp 158

Boquien¹,

Lisenfeld²,

Duc³

et al. 2011

A&A

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Context. Recent studies have shown that star formation in mergers does not seem to follow the same Schmidt-Kennicutt relation as in spiral disks, presenting a higher star formation rate (SFR) for a given gas column density. Aims. In this paper we study why and how different models of star formation arise. To do so we examine the process of star formation in the interacting system Arp 158 and its tidal debris. Methods. We perform an analysis of the properties of specific regions of interest in Arp 158 using observations tracing the atomic and the molecular gas, star formation, the stellar populations as well as optical spectroscopy to determine their exact nature and their metallicity. We also fit their spectral energy distribution with an evolutionary synthesis code. Finally, we compare star formation in these objects to star formation in the disks of spiral galaxies and mergers. Results. Abundant molecular gas is found throughout the system and the tidal tails appear to have many young stars compared to their old stellar content. One of the nuclei is dominated by a starburst whereas the other is an active nucleus. We estimate the SFR throughout the systems using various tracers and find that most regions follow closely the Schmidt-Kennicutt relation seen in spiral galaxies with the exception of the nuclear starburst and the tip of one of the tails. We examine whether this diversity is due to uncertainties in the manner the SFR is determined or whether the conditions in the nuclear starburst region are such that it does not follow the same Schmidt-Kennicutt law as other regions. Conclusions. Observations of the interacting system Arp 158 provide the first evidence in a resolved fashion that different star-forming regions in a merger may be following different Schmidt-Kennicutt laws. This suggests that the physics of the interstellar medium at a scale no larger than 1 kpc, the size of the largest gravitational instabilities and the injection scale of turbulence, determines the origin of these laws.

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“…Transfer of mass between the inner and outer regions of the g component may be induced by the gravitational effects of a bar-like potential near the center of the galaxy. This potential may be intrinsic to the galaxy (Simkin et al 1980) or produced by a companion galaxy passing by the host galaxy (Dahari 1985;Keel et al 1985;Lin et al 1988). …”

Section: Distribution Of the Line-emitting Gas In Active Galaxiesmentioning

confidence: 99%

The line-emitting gas in active galaxies - A probe of the nuclear engine

Veilleux¹

1993

PASP

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ABSTRACT. This paper reviews some of the basic questions regarding the structure of the engine powering active galactic nuclei (AGN), the nature of the interaction between the AGN and the host galaxy, and the origin and evolution of AGN. The study of the dynamics and physical characteristics of the line-emitting gas in these objects has proven fruitful in addressing many of these issues. Recent advances in optical and infrared detector technology combined with the development of superior ground-based instruments have produced efficient new tools for the study of the line-emitting gas on nuclear (R % 1 pc) and galactic {R £ 50 pc) scales. Programs which take advantage of two of these new techniques, Fabry-Perot imaging spectroscopy and infrared spectroscopy, are described in this paper. The origin of nuclear activity in galaxies is also addressed in a third project which aims at determining the nature of luminous infrared galaxies.

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The nuclear activity of interacting galaxies

Cited by 154 publications

References 0 publications

Ultraviolet properties of early-type galaxies

Ultraviolet properties of early-type galaxies

Studying the spatially resolved Schmidt-Kennicutt law in interacting galaxies: the case of Arp 158

The line-emitting gas in active galaxies - A probe of the nuclear engine

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