Numerous Old Starburst Galaxies in the Local Universe

Mouri, Hideaki; Taniguchi, Yoshiaki

doi:10.1086/317883

Cited by 3 publications

(7 citation statements)

References 31 publications

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“…Mrk starburst galaxies have burst ages of order 10 7 yr and account for 3% of all the galaxies (Balzano 1983;Calzetti 1997). Old starburst galaxies studied by Mouri & Taniguchi (2000) have burst ages of order 10 8 yr and account for 30%-40% of all the galaxies. These number fractions are too large to be explained by a single series of burst events in a galaxy, which has an age of order 10 10 yr.…”

Section: B Comments On Nuclear-starburst Galaxiesmentioning

confidence: 97%

“…The starburst age affects the flux density ratio S 100 /S 60 (Mouri & Taniguchi 2000). A starburst region consists of star clusters.…”

Section: Properties Of Circumnuclear Starburstsmentioning

confidence: 99%

“…Although some of the Seyfert galaxies appear to suffer from the AGN component with low S 100 /S 60 , an important fraction of them has S 100 /S 60 > 2. The median value S 100 /S 60 = 2.29 was obtained for a sample of old starburst galaxies by Mouri & Taniguchi (2000;Appendix B). These galaxies have starburst ages of order 10 8 yr.…”

Section: Properties Of Circumnuclear Starburstsmentioning

confidence: 99%

“…Their vigorous AGNs could readily overwhelm the starbursts. If a supermassive black hole does not exist at the center, a starburst galaxy evolves to an old starburst galaxy such as those studied by Mouri & Taniguchi (2000;Appendix B). The origin of a supermassive black hole is attributable to a past starburst episode.…”

Section: Possible Evolutionary Scenariomentioning

confidence: 99%

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Far‐Infrared Census of Starburst‐Seyfert Connection

Mouri

Taniguchi

2002

ApJ

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Far-infrared flux densities are newly extracted from the IRAS database for the RSA and CfA complete samples of Seyfert galaxies. These data are used to classify the Seyfert galaxies into those where the far-infrared continuum emission is dominated by the active galactic nucleus (AGN), circumnuclear starburst, or host galaxy.While AGN-dominant objects consist of comparable numbers of Seyfert 1 and 2 galaxies, starburst-and host-dominant objects consist preferentially of Seyfert 2 galaxies. Thus, in addition to the dusty torus, the circumnuclear starburst region and host galaxy are important in hiding the broad-line region.Morphologically, starburst-dominant Seyfert galaxies are of later types and more strongly interacting than AGN-dominant Seyfert galaxies. In a later-type galaxy, the AGN central engine has a lower Eddington luminosity, and the gaseous content is higher. The gas is efficiently supplied to the starburst via a galaxygalaxy interaction. Morphologies of host-dominant Seyfert galaxies are of various types.Since starbursts in Seyfert galaxies are older than those in classical starburst galaxies, we propose an evolution from starburst to starburst-dominant Seyfert to host-dominant Seyfert for a late-type galaxy. An evolution from AGN-dominant Seyfert to host-dominant Seyfert is proposed for an early-type galaxy. These sequences have durations of a few × 10 8 yr and occur repeatedly within a galaxy during its evolution from a late type to an early type.

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Section: B Comments On Nuclear-starburst Galaxiesmentioning

confidence: 97%

“…The starburst age affects the flux density ratio S 100 /S 60 (Mouri & Taniguchi 2000). A starburst region consists of star clusters.…”

Section: Properties Of Circumnuclear Starburstsmentioning

confidence: 99%

Section: Properties Of Circumnuclear Starburstsmentioning

confidence: 99%

Section: Possible Evolutionary Scenariomentioning

confidence: 99%

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Far‐Infrared Census of Starburst‐Seyfert Connection

Mouri

Taniguchi

2002

ApJ

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“…This implies that BCG progenitors probably are not a rare type of gas-rich low-mass galaxy (see, however, Salzer & Norton 1999). On the other hand, the recent results by Mouri & Taniguchi (2000), based on far-IR tracers of recent SF, indicate that up to ∼(30−40)% of the galaxies in their magnitudelimited sample within the galactic neighborhood have experienced SF activity during the last 100 Myr. The evidence that such a large fraction of galaxies experience episodes of significantly enhanced SF emphasizes the importance of BCG studies.…”

Section: Introductionmentioning

confidence: 99%

The Hamburg/SAO Survey for low metallicity blue compact H II galaxies (HSS–LM)

Ugryumov

Engels

Pustilnik

et al. 2002

A&A

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Abstract. We present the description and the first results of a new project devoted to the search for extremely metaldeficient blue compact/H -galaxies (BCGs) and to the creation of a well selected large BCG sample with strong emission lines. Such galaxies should be suitable for reliable determination of their oxygen abundance through the measurement of the faint [O ] λ 4363 Å line. The goals of the project are two-fold: a) to discover a significant number of new extremely metalpoor galaxies (Z 1/20 Z ), and b) to study the metallicity distribution of local BCGs. Selection of candidates for follow-up slit spectroscopy is performed on the database of objective prism spectra of the Hamburg Quasar Survey. The sky region is limited by δ ≥ 0• and b II ≤ −30• . In this paper we present the results of the follow-up spectroscopy conducted with the Russian 6 m telescope. The list of observed candidates contained 52 objects, of which 46 were confirmed as strong-lined BCGs (EW([O ] λ 5007) ≥ 100 Å). The remaining five lower excitation ELGs include three BCGs, and two galaxies classified as SBN (Starburst Nucleus) and DANS (Dwarf Amorphous Nucleus Starburst). One object is identified as a quasar with a strong Lyα emission line near λ 5000 Å (z ∼ 3). We provide a list with coordinates, measured radial velocities, B-magnitudes, equivalent widths EW([O ] λ 5007) and EW(Hβ) and for the 46 strong-lined BCGs the derived oxygen abundances 12+log(O/H). The abundances range between 7.42 and 8.4 (corresponding to metallicities between 1/30 and 1/3 Z ). The sample contains four galaxies with Z 1/20 Z , of which three are new discoveries. This demonstrates the high efficiency of the new project to find extremely metal-deficient galaxies. The radial velocities of the strong-lined ELGs range between 500 and 19 000 km s −1 with a median value of ∼6400 km s −1 . The typical B-magnitudes of the galaxies presented are 17. m 0−18. m 0.

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Emission-line galaxies from SDSS DR4: Statistical studies of the current star formation

Izotova

Parnovsky

2008

Kinemat. Phys. Celest. Bodies

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Numerous Old Starburst Galaxies in the Local Universe

Cited by 3 publications

References 31 publications

Far‐Infrared Census of Starburst‐Seyfert Connection

Far‐Infrared Census of Starburst‐Seyfert Connection

The Hamburg/SAO Survey for low metallicity blue compact H II galaxies (HSS–LM)

Emission-line galaxies from SDSS DR4: Statistical studies of the current star formation

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