[ITAL]HUBBLE SPACE TELESCOPE[/ITAL][ITAL]Hubble Space Telescope[/ITAL] Observations of Nearby Radio-Loud Early-Type Galaxies

Kleijn, G. A. Verdoes; Baum, S. A.; Zeeuw, P. T. de; O’Dea, C. P.

doi:10.1086/301135

Cited by 96 publications

(140 citation statements)

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“…This roughly doubles the total number of early-type galaxies that have been imaged with the HST . Together with the data taken so far and with similar samples of spiral bulges (Phillips et al 1996 ;Carollo et al 1997b ;Carollo, Stiavelli, & Mack 1998) and radio galaxies (de Ko † et al 1996 ;McCarthy et al 1997 ;Martel et al 1999 ;Verdoes Kleijn et al 1999) these images provide a database for the investigation of correlations of properties such as dust, metallicity, colors, activity, and nuclear structure.…”

Section: Introductionmentioning

confidence: 80%

WFPC2 Images of the Central Regions of Early-Type Galaxies. I. The Data

Rest

Bosch

Jaffe

et al. 2001

The Astronomical Journal

207

377

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We present high-resolution R-band images of the central regions of 67 early-type galaxies obtained with the Wide Field and Planetary Camera 2 (WFPC2) aboard the Hubble Space T elescope (HST ). This homogeneously selected sample roughly doubles the number of early-type galaxies that have now been imaged at HST resolution and complements similar data on the central regions of radio galaxies and the bulges of spiral galaxies. Our sample strikingly conÐrms the complex morphologies of the central regions of early-type galaxies which have become apparent from previous studies with HST . In particular, we detect dust, either in the form of nuclear disks or with a Ðlamentary distribution, in 43% of all galaxies, in good agreement with previous estimates. In addition, we Ðnd evidence for embedded stellar disks in a remarkably large fraction of 51%. In 14 of those galaxies the disklike structures are misaligned with the main galaxy, suggesting that they correspond to stellar bars in S0 galaxies. We analyze the luminosity proÐles of the galaxies in our sample and classify galaxies according to their central cusp slope. To a large extent we conÐrm the results from previous HST surveys in that early-type galaxies reveal a clear dichotomy : the bright ellipticals are generally boxy and have luminosity proÐles that (M B [ [20.5) break from steep outer power laws to shallow inner cusps (referred to as "" core ÏÏ galaxies). The fainter ellipticals, on the other hand, typically have disky isophotes and luminosity proÐles that lack a clear break and have a steep central cusp (referred to as "" power-law ÏÏ galaxies). The advantages and shortcomings of classiÐcation schemes utilizing the extrapolated central cusp slope c are discussed, and it is shown that c might be an inadequate representation for galaxies whose luminosity proÐle slope changes smoothly with radius rather than resembling a broken power law. Thus, we introduce a new, alternative parameter and show how this a †ects the classiÐcation. In fact, we Ðnd evidence for an "" intermediate ÏÏ class of galaxies that cannot unambiguously be classiÐed as either core or power-law galaxies and that have central cusp slopes and absolute magnitudes intermediate between those of core and power-law galaxies. It is unclear at present, however, whether these galaxies make up a physically distinct class or whether distance and/or resolution e †ects cause them to lose their distinct core or power-law characteristics.

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Section: Introductionmentioning

confidence: 80%

WFPC2 Images of the Central Regions of Early-Type Galaxies. I. The Data

Rest

Bosch

Jaffe

et al. 2001

The Astronomical Journal

207

377

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“…Siegel 1956) gives a probability of 0.9% that the distribution in Table 4 is due to chance. It should also be mentioned that if we limit ourselves to sources with a jet and with redshift z < 0.03 (like the objects discussed by Verdoes Kleijn et al 1999), then dust is detected even in 80% of the cases, against the 53% overall. This increase in the detection of dust features in more nearby galaxies regards only sources with a radio jet: if no jet is present the fraction of sources with dust is close to 50%, both for nearby sources and for the sources with z > 0.03.…”

Section: The Detection Of Dustmentioning

confidence: 96%

“…Send offprint requests to: H. R. de Ruiter, e-mail: deruiter@bo.astro.it Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555 and by STScI grant These studies revealed the presence of new and interesting features, some of them almost exclusively associated to low luminosity FR I radio galaxies. For example, the HST observations have shown the presence of dust in a large fraction of weak (FR I) radio galaxies which takes the form of extended nuclear disks (Jaffe et al 1993;de Koff et al 1996;de Juan et al 1996;Verdoes Kleijn et al 1999). Such structures have been naturally identified with the reservoir of material which will ultimately accrete into the central black hole.…”

Section: Introductionmentioning

confidence: 99%

HST images of B2 radio galaxies: A link between circum-nuclear dust and radio properties?

Ruiter

Parma

Capetti

et al. 2002

A&A

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Abstract. Almost 60% of the B2 low luminosity radio galaxies have been observed with the Hubble Space Telescope. We present an analysis of the dust features, which are often present in the form of circum-nuclear disks or lanes, and show that there are correlations between radio source and dust properties. It is found that nearby radio sources in which a jet has been detected tend to have dust more often than sources without jets; the dust is often in the form of disks or lanes. Moreover the radio jets are close to perpendicular to the disk or lane in the weaker radio sources (with P < 10 24 WHz −1 ). In stronger sources the orientation effect appears to be weak or even absent. Also the dust masses found in the weaker radio sources are smaller than in the stronger ones (log M/M ∼ 3 against 5 respectively). More generally it appears that there is a correlation between dust mass and total radio power (for those sources in which dust has been detected); we show that this correlation is not induced by redshift.

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“…However we should also take into account the possibility that our sample is biased by considering much higher dust prevalence in certain classes of early type galaxies. This happens for instance in radioloud galaxies, having dust detection probability of about 90% (van Dokkum & Franx, 1995;Verdoes Kleijn et al 1999). Our sample hosts one radio galaxy: NGC 7626 (Hibbard & Sansom 2003).…”

Section: Dust Originmentioning

confidence: 99%

HST/ACS observations of shell galaxies: inner shells, shell colours and dust

Sikkema

Carter²,

Peletier

et al. 2007

A&A

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Context. Shells in Elliptical Galaxies are faint, sharp-edged features, believed to provide evidence for a merger event. Accurate photometry at high spatial resolution is needed to learn on presence of inner shells, population properties of shells, and dust in shell galaxies. Aims. Learn more about the origin of shells and dust in early type galaxies. Methods. V − I colours of shells and underlying galaxies are derived, using HST Advanced Camera for Surveys (ACS) data. A galaxy model is made locally in wedges and subtracted to determine shell profiles and colours. We applied Voronoi binning to our data to get smoothed colour maps of the galaxies. Comparison with N-body simulations from the literature gives more insight to the origin of the shell features. Shell positions and dust characteristics are inferred from model galaxy subtracted images. Results. The ACS images reveal shells well within the effective radius in some galaxies (at 0.24 r e = 1.7 kpc in the case of NGC 5982). In some cases, strong nuclear dust patches prevent detection of inner shells. Most shells have colours which are similar to the underlying galaxy. Some inner shells are redder than the galaxy. All six shell galaxies show out of dynamical equilibrium dust features, like lanes or patches, in their central regions. Our detection rate for dust in the shell ellipticals is greater than that found from HST archive data for a sample of normal early-type galaxies, at the 95% confidence level.Conclusions. The merger model describes better the shell distributions and morphologies than the interaction model. Red shell colours are most likely due to the presence of dust and/or older stellar populations. The high prevalence and out of dynamical equilibrium morphologies of the central dust features point towards external influences being responsible for visible dust features in early type shell galaxies. Inner shells are able to manifest themselves in relatively old shell systems.

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[ITAL]HUBBLE SPACE TELESCOPE[/ITAL][ITAL]Hubble Space Telescope[/ITAL] Observations of Nearby Radio-Loud Early-Type Galaxies

Cited by 96 publications

References 96 publications

WFPC2 Images of the Central Regions of Early-Type Galaxies. I. The Data

WFPC2 Images of the Central Regions of Early-Type Galaxies. I. The Data

HST images of B2 radio galaxies: A link between circum-nuclear dust and radio properties?

HST/ACS observations of shell galaxies: inner shells, shell colours and dust

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