Relationships of the Active Nucleus, Galaxy, and Environment

Fricke, K. J.; Kollatschny, W.

doi:10.1007/978-94-009-0963-2_135

Cited by 18 publications

(8 citation statements)

References 62 publications

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“…1). As the bulk of our sample consists of Sy 1 objects, the preference for early types may reflect that Sy 1 galaxies tend to have smaller T than Sy 2 ones (Fricke & Kollatschny 1989;Koulouridis et al 2006). The trend of active galaxies being earlier types than inactive ones has already been noted by Terlevich et al (1987;see also Hunt & Malkan 1999).…”

Section: Seyfert Samplementioning

confidence: 62%

Optical multiband surface photometry of a sample of Seyfert galaxies

Slavcheva-Mihova

Mihov

2010

A&A

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Context. Parallel analysis of the large-scale morphology and local environment of matched active and control galaxy samples plays an important role in studies of the fueling of active galactic nuclei. Aims. We carry out a detailed morphological characterization of a sample of 35 Seyfert galaxies and a matched sample of inactive galaxies in order to compare the evidence of non-axisymmetric perturbation of the potential and, in the second part of this paper, to be able to perform a multicomponent photometric decomposition of the Seyfert galaxies. Methods. We constructed contour maps, BVR C I C profiles of the surface brightness, ellipticity, and position angle, as well as colour index profiles. We further used colour index images, residual images, and structure maps, which helped clarify the morphology of the galaxies. We studied the presence of close companions using literature data. Results. By straightening out the morphological status of some of the objects, we derived an improved morphological classification and built a solid basis for a further multicomponent decomposition of the Seyfert sample. We report hitherto undetected (to our knowledge) structural components in some Seyfert galaxies -a bar (Ark 479), an oval/lens (Mrk 595), rings (Ark 120, Mrk 376), a nuclear bar and ring (Mrk 352), and nuclear dust lanes (Mrk 590). We compared the large-scale morphology and local environment of the Seyfert sample to those of the control one and found that (1) the two samples show similar incidences of bars, rings, asymmetries, and close companions; (2) the Seyfert bars are generally weaker than the bars of the control galaxies; (3) the bulk of the two samples shows morphological evidence of non-axisymmetric perturbations of the potential or close companions; (4) the fueling of Seyfert nuclei is not directly related to the large-scale morphology and local environment of their host galaxies.

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Section: Seyfert Samplementioning

confidence: 62%

Optical multiband surface photometry of a sample of Seyfert galaxies

Slavcheva-Mihova

Mihov

2010

A&A

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“…The concept that nuclear activity in Seyfert galaxies and quasars is triggered by gravitational interactions with the environment of AGN has received much observational and theoretical support (reviewed by Fricke & Kollatschny 1989). Our galaxies show disturbed morphologies and tidal arms as signatures of former gravitational interaction.…”

Section: Introductionmentioning

confidence: 74%

Long-Term Variability of AGN

Bischoff

Kollatschny

Dietrich³

1997

International Astronomical Union Colloquium

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“…da Costa et al (1998) classified it as Im (10) galaxy. Following to Fricke & Kollatschny (1989) it is a faint Hα emitter. Our morphological study confirms the spiral nature of this galaxy (Sa classification).…”

Section: Maps-ngp O_442_2131626 Van Denmentioning

confidence: 99%

Early-type galaxies with core collapse supernovae

Hakobyan¹,

Петросян²,

McLean

et al. 2008

A&A

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Aims. It is widely accepted that the progenitors of core collapse SNe are young massive stars and therefore their host galaxies are mostly spiral or irregular galaxies dominated by a young stellar population. Surprisingly, among morphologically classified hosts of core collapse SNe, we find 22 cases where the host has been classified as an Elliptical or S0 galaxy. Methods. To clarify this apparent contradiction, we carry out a detailed morphological study and an extensive literature search for additional information on the sample objects. Results. Our results are as follows: 1. Of 22 "early type" objects, 17 are in fact misclassified spiral galaxies, one is a misclassified irregular, and one is a misclassified ring galaxy. 2. Of the 3 objects maintaining the early type classification, one (NGC 2768) is a suspected merger remnant, another (NGC 4589) is definitely a merger, and the third (NGC 2274) is in close interaction. The presence of some amount of young stellar population in these galaxies is therefore not unexpected. Conclusions. These results confirm the presence of a limited, but significant, number of core collapse SNe in galaxies generally classified as early-type. In all cases, anyway, there are independent indicators of the presence in host galaxies of recent star formation due to merging or gravitational interaction.

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Relationships of the Active Nucleus, Galaxy, and Environment

Cited by 18 publications

References 62 publications

Optical multiband surface photometry of a sample of Seyfert galaxies

Optical multiband surface photometry of a sample of Seyfert galaxies

Long-Term Variability of AGN

Early-type galaxies with core collapse supernovae

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