A unified model for the evolution of galaxies and quasars

Kauffmann, Guinevere; Haehnelt, Martin G.

doi:10.1046/j.1365-8711.2000.03077.x

Cited by 1,128 publications

(1,274 citation statements)

References 95 publications

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“…Statistical studies on available spectral information also reveal that there is a Seyfert l/QSO excess in the single nucleus category. Therefore, our results strongly support the argument of Kauffmann & Haehnelt (2000) that bulge and supermassive black hole may both grow in galaxy merging. And they also give some hints to a possible close relation of central black hole with properties of its host galaxy's bulge (Gebhardt et ale 2000).…”

Section: Some Hints For Merging Dynamics 175supporting

confidence: 89%

Merging Galaxies with Multiple Nuclei from HST ULIRGs Snapshot Survey

Cui

Xia

Deng

et al. 2001

Symp. - Int. Astron. Union

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Abstract.We perform photometric measurements on a large HST snapshot imaging survey sample of 97 ultraluminous infrared galaxies (ULIRGs). We classify all the sources into three categories with multiple, double and single nucleus/nuclei, mainly based on a quantitative criterion of I-band luminosity. The resultant fractions of multiple, double and single nucleus/nuclei ULIRGs are 18%, 39% and 43%, respectively. This supports the multiple merger scenario as a possible origin of ULIRGs, in addition to the commonly-accepted pair merger model. Further statistical studies indicate that the fraction of AGN increases from multiple (18%) to double (39%) and then to single (43%) nucleus/nuclei ULIRGs. For the single nucleus category, there is a high luminosity tail in the luminosity distribution, which corresponds to a Seyfert l/QSO excess. This supports the statement that active galactic nuclei tend to appear at final merging stage. For multiple and double mergers, we also find a considerably high fraction of very close nucleus pairs (e.g., 2/3 for those separated by less than 5 kpc). This strengthens the conclusion that systems at late merging phase preferentially host ULIRGs.

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Section: Some Hints For Merging Dynamics 175supporting

confidence: 89%

Merging Galaxies with Multiple Nuclei from HST ULIRGs Snapshot Survey

Cui

Xia

Deng

et al. 2001

Symp. - Int. Astron. Union

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“…At least out to a redshift of three, the overall evolution in the rates of starformation and black hole accretion track one another rather well: a steep rise by about an order-of-magnitude from z = 0 to 1 and then relatively little change between z = 1 to 3 (e.g., Marconi et al 2004). Coupled with the tight correlation between the mass of the black hole and the velocity dispersion and mass of the galactic bulge within which it resides (e.g., Gultekin et al 2009;Marconi & Hunt 2003;Haring & Rix 2004), there is 4 T. M. Heckman then compelling evidence for a close connection between the formation of the black hole and that of its host galaxy (e.g., Kauffmann & Haehnelt 2000;Granato et al 2001).…”

Section: Introductionmentioning

confidence: 99%

The Co-Evolution of Galaxies and Black Holes: Current Status and Future Prospects

Heckman

2009

Proc. IAU

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Abstract. I begin by summarizing the evidence that there is a close relationship between the evolution of galaxies and supermassive black holes. They evidently share a common fuel source, and feedback from the black hole may be needed to suppress over-cooling in massive galaxies.I then review what we know about the co-evolution of galaxies and black holes in the modern universe (z < 1). We now have a good documentation of which black holes are growing (the lower mass ones), where they are growing (in the less massive early-type galaxies), and how this growth is related in a statistical sense to star formation in the central region of the galaxy. The opportunity in the next decade will be to use the new observatories to undertake ambitious programs of 3-D imaging spectroscopy of the stars and gas in order to understand the actual astrophysical processes that produce the demographics we observe. At high redshift (z > 2), the most massive black holes and the progenitors of the most massive galaxies are forming. Here, we currently have a tantalizing but fragmented view of their co-evolution. In the next decade, the huge increase in sensitivity and discovery power of our observatories will enable us to analyze the large, complete samples we need to achieve robust and clear results.

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“…Major mergers have been widely suggested as a triggering mechanism of AGN activity (e.g. Kauffmann & Haehnelt 2000;Hopkins et al 2005). Secular processes (disk instabilities, minor mergers, recycled gas from dying stars, galaxy bars etc.)…”

Section: Introductionmentioning

confidence: 99%

Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies

Gürkan¹,

Hardcastle²,

Jarvis³

et al. 2015

Mon. Not. R. Astron. Soc.

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We examine the relationship between star formation and AGN activity by constructing matched samples of local (0 < z < 0.6) radio-loud and radio-quiet AGN in the Herschel-ATLAS fields. Radio-loud AGN are classified as high-excitation and low-excitation radio galaxies (HERGs, LERGs) using their emission lines and WISE 22-µm luminosity. AGN accretion and jet powers in these active galaxies are traced by [OIII] emission-line and radio luminosity, respectively. Star formation rates (SFRs) and specific star formation rates (SSFRs) were derived using Herschel 250-µm luminosity and stellar mass measurements from the SDSS−MPA-JHU catalogue. In the past, star formation studies of AGN have mostly focused on high-redshift sources to observe the thermal dust emission that peaks in the far-infrared, which limited the samples to powerful objects. However, with Herschel we can expand this to low redshifts. Our stacking analyses show that SFRs and SSFRs of both radio-loud and radioquiet AGN increase with increasing AGN power but that radio-loud AGN tend to have lower SFR. Additionally, radio-quiet AGN are found to have approximately an order of magnitude higher SSFRs than radio-loud AGN for a given level of AGN power. The difference between the star formation properties of radio-loud and -quiet AGN is also seen in samples matched in stellar mass.

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A unified model for the evolution of galaxies and quasars

Cited by 1,128 publications

References 95 publications

Merging Galaxies with Multiple Nuclei from HST ULIRGs Snapshot Survey

Merging Galaxies with Multiple Nuclei from HST ULIRGs Snapshot Survey

The Co-Evolution of Galaxies and Black Holes: Current Status and Future Prospects

Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies

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