NGC 1365

Lindblad, P. O.

doi:10.1007/s001590050018

Cited by 68 publications

(85 citation statements)

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“…It must fall toward the center. In fact, NGC 1365 has high gas densities and active star formation in its bright center (Lindblad 1999;Curran et al 2001a, b). Adapted from Fig.…”

Section: The Response Of Gas To a Rotating Bar: Construction Of Outermentioning

confidence: 99%

Secular evolution in disk galaxies

Kormendy¹

2013

Secular Evolution of Galaxies

124

138

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Self-gravitating systems evolve toward the most tightly bound configuration that is reachable via the evolution processes that are available to them. They do this by spreading -the inner parts shrink while the outer parts expand -provided that some physical process efficiently transports energy or angular momentum outward. The reason is that self-gravitating systems have negative specific heats. As a result, the evolution of stars, star clusters, protostellar and protoplanetary disks, black hole accretion disks and galaxy disks are fundamentally similar. How evolution proceeds then depends on the evolution processes that are available to each kind of self-gravitating system. These processes and their consequences for galaxy disks are the subjects of my lectures and of this Canary Islands Winter School.I begin with a review of the formation, growth and death of bars. Then I review the slow ("secular") rearrangement of energy, angular momentum, and mass that results from interactions between stars or gas clouds and collective phenomena such as bars, oval disks, spiral structure and triaxial dark halos. The "existence-proof" phase of this work is largely over: we have a good heuristic understanding of how nonaxisymmetric structures rearrange disk gas into outer rings, inner rings and stuff dumped onto the center. The results of simulations correspond closely to the morphology of barred and oval galaxies. Gas that is transported to small radii reaches high densities. Observations confirm that many barred and oval galaxies have dense central concentrations of gas and star formation. The result is to grow, on timescales of a few Gyr, dense central components that are frequently mistaken for classical (elliptical-galaxy-like) bulges but that were grown slowly out of the disk (not made rapidly by major mergers). The resulting picture of secular galaxy evolution accounts for the richness observed in galaxy structure.

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“…It must fall toward the center. In fact, NGC 1365 has high gas densities and active star formation in its bright center (Lindblad 1999;Curran et al 2001a, b). Adapted from Fig.…”

Section: The Response Of Gas To a Rotating Bar: Construction Of Outermentioning

confidence: 99%

Secular evolution in disk galaxies

Kormendy¹

2013

Secular Evolution of Galaxies

124

138

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“…Risaliti et al 2009, and references therein). An extensive overview of this galaxy is found in Lindblad (1999). In the midinfrared, TIMMI2 data show that the nucleus is surrounded by 7 individual sources within 20 arcsec from the nucleus (Galliano et al 2005;Raban et al 2008), which are interpreted as embedded young star clusters.…”

Section: Ngc 1365mentioning

confidence: 99%

Parsec-scale dust distributions in Seyfert galaxies

Tristram¹,

Raban

Meisenheimer

et al. 2009

A&A

113

106

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Aims. The emission of warm dust dominates the mid-infrared spectra of active galactic nuclei (AGN). Only interferometric observations provide the necessary angular resolution to resolve the nuclear dust and to study its distribution and properties. The investigation of dust in AGN cores is hence one of the main science goals for the MID-infrared Interferometric instrument MIDI at the VLTI. As the first step, the feasibility of AGN observations was verified and the most promising sources for detailed studies were identified. Methods. This was carried out in a "snapshot survey" with MIDI using Guaranteed Time Observations. In the survey, observations were attempted for 13 of the brightest AGN in the mid-infrared which are visible from Paranal. Results. The results of the three brightest, best studied sources have been published in separate papers. Here we present the interferometric observations for the remaining 10, fainter AGN. For 8 of these, interferometric measurements could be carried out. Size estimates or limits on the spatial extent of the AGN-heated dust were derived from the interferometric data of 7 AGN. These indicate that the dust distributions are compact, with sizes on the order of a few parsec. The derived sizes roughly scale with the square root of the luminosity in the mid-infrared, s ∝ √ L MIR , with no clear distinction between type 1 and type 2 objects. This is in agreement with a model of nearly optically thick dust structures heated to T ∼ 300 K. For three sources, the 10 μm feature due to silicates is tentatively detected either in emission or in absorption. Conclusions. The faint AGN of the snapshot survey are at the sensitivity limit of observations with MIDI. Thus, the data set presented here provides a good insight into the observational difficulties and their implications for the observing strategy and data analysis. Based on the results for all AGN studied with MIDI so far, we conclude that in the mid-infrared the differences between individual galactic nuclei are greater than the generic differences between type 1 and type 2 objects.

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“…A global picture of NGC 1365 can be found in the review by Lindblad (1999). This spiral galaxy with a prominent bar has been classified as SBb(s)I (Sandage & Tammann 1981).…”

Section: Ngc 1365: Mir Detection Of Radio Sourcesmentioning

confidence: 99%

“…This spiral galaxy with a prominent bar has been classified as SBb(s)I (Sandage & Tammann 1981). An estimate of its distance is discussed in Lindblad (1999) and is currently 18.6±0.6 Mpc. At this distance, 1 corresponds to 90 pc.…”

Section: Ngc 1365: Mir Detection Of Radio Sourcesmentioning

confidence: 99%

“…In the optical, this region shows several bright hot spots within 1 kpc around the AGN. The HST images resolve the circumnuclear region into a large number of bright, compact star clusters of only a few parsec radii (Kristen et al 1997;Lindblad 1999). In the radio domain, continuum observations have been performed at 20, 6 and 2 cm with the VLA (Sandqvist et al 1982;Saikia et al 1994;Sandqvist et al 1995) and at 6 and 3 cm by Forbes & Norris (1998) with the Australian Compact Array (ATCA).…”

Section: Ngc 1365: Mir Detection Of Radio Sourcesmentioning

confidence: 99%

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Mid-infrared imaging of active galaxies

Galliano¹,

Alloin

Pantin

et al. 2005

A&A

163

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Abstract. High resolution, mid-infrared (MIR) images of nine nearby active galaxies are presented. The data were obtained with the TIMMI 2 instrument mounted at the ESO 3.6 m telescope using a set of N-band narrow filters. The resulting images have an angular resolution of 0.6 −1 . The MIR emission has been resolved in four galaxies: NGC 253, NGC 1365, NGC 1808 and NGC 7469. The images show a circumnuclear population of unknown MIR sources in NGC 1365 and NGC 1808, coincident with radio sources. These MIR/radio sources are interpreted in terms of embedded young star clusters. A high-resolution MIR map of NGC 253 is also presented, and enables the identification of a previously unknown MIR counterpart to the radio nucleus. Extended MIR emission is detected in NGC 7469, and concurs with previous observations in the NIR and radio. For this source, an interesting morphological difference between the 10.4 µm and the 11.9 µm emission is observed, suggesting the presence of a dust-rich micro-bar. Our MIR images of Circinus do not show resolved emission from the nucleus down to an angular scale of 0.5 . In the case of NGC 2992, an upper limit to the extended MIR emission can be set. We provide new MIR flux measurements for the unresolved AGN in NGC 5995, IZw1 and IIZw136.

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NGC 1365

Cited by 68 publications

References 0 publications

Secular evolution in disk galaxies

Secular evolution in disk galaxies

Parsec-scale dust distributions in Seyfert galaxies

Mid-infrared imaging of active galaxies

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