scholarly journals 3.3. Circumnuclear regions of active and non-active barred galaxies

1998 ◽  
Vol 184 ◽  
pp. 93-94
Author(s):  
J.H. Knapen
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Seyfert Galaxy ◽  
Active Galaxies ◽  
Necessary Condition ◽  
Nuclear Activity ◽  
Barred Galaxies ◽  
Galaxy Cores

I discuss the role of galactic bars in the fuelling of (circum)nuclear activity. Since the majority of all galaxies are barred, the presence of a bar in a Seyfert galaxy cannot be the sole reason for their activity, although it appears to be a necessary condition for activity. Two options for further work are being explored, high-resolution near-infrared imaging of samples of active and non-active galaxies, and detailed case studies of selected galaxy cores.

scholarly journals Feeding Versus Feedback in AGNs from Near-Infrared IFU Observations: The Case of Mrk 1066

2009 ◽  
Vol 5 (S267) ◽  
pp. 405-405
Author(s):  
Rogemar A. Riffel ◽  
Thaisa Storchi-Bergmann
Keyword(s):  
Spatial Resolution ◽  
Central Region ◽  
Near Infrared ◽  
Galactic Plane ◽  
Seyfert Galaxy ◽  
Active Galaxies ◽  
Molecular Gas ◽  
Field Observations ◽  
Ionized Gas ◽  
Integral Field

Previous studies of the central region of active galaxies show that the molecular and ionized gas have distinct kinematics and flux distributions, with the former dominated by quiescent kinematics characteristic of rotation in the galactic plane and the latter with more disturbed kinematics and apparently extending to larger galactic latitudes. These results suggest that the molecular gas can be a tracer of the feeding of the AGN and the ionized gas a tracer of its feedback (e.g., Riffel et al. 2009, 2008, 2006; Storchi-Bergmann et al. 2009a, b). In the present study we use Gemini NIFS integral field observations of the inner 700×700 pc2 of the Seyfert galaxy Mrk 1066 at a spatial resolution of ~ 35 pc to investigate if the above scenario is also valid for this galaxy.

High-resolution mid-infrared imaging and astrometry of the nucleus of the Seyfert galaxy NGC 1068

1993 ◽  
Vol 409 ◽  
pp. L5 ◽  
Author(s):  
J. A. Braatz ◽  
A. S. Wilson ◽  
D. Y. Gezari ◽  
F. Varosi ◽  
C. A. Beichman
Keyword(s):  
High Resolution ◽  
Infrared Imaging ◽  
Seyfert Galaxy ◽  
Mid Infrared ◽  
Ngc 1068

The true nucleus of NGC 253 revealed by high-resolution near-infrared imaging

1994 ◽  
Vol 430 ◽  
pp. L33 ◽  
Author(s):  
Bruce J., III Sams ◽  
R. Genzel ◽  
A. Eckart ◽  
L. Tacconi-Garman ◽  
R. Hofmann
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging

scholarly journals Optical & Near Infrared Imaging of NGC1275

1989 ◽  
Vol 134 ◽  
pp. 376-378
Author(s):  
D. H. Hughes ◽  
E. I. Robson ◽  
M. J. Ward
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Wavelength Region ◽  
Seyfert Galaxy ◽  
Elliptical Galaxies ◽  
Infrared Images ◽  
Different Populations ◽  
Reduced Data ◽  
Array Camera ◽  
Selection Of

We are currently studying a selection of active galaxies using the new IR array camera IRCAM on UKIRT. Our aim is to seperate the underlying stellar emission from that of the active galactic nucleus. Although the optical is the best wavelength region to discriminate between the different populations in the underlying spiral and elliptical galaxies, it is in the infrared that the contrast between the non-thermal central core and the surrounding galaxy is increased. We present reduced data from infrared images taken at 1.25, 1.65 and 2.2 μm with an image scale of 0.6 arcsec/pixel together with optical 0.44 and 0.55 μm CCD images of the Seyfert galaxy NGC1275.

scholarly journals HIGH-RESOLUTION NEAR-INFRARED IMAGING OF SUBMILLIMETER GALAXIES

2013 ◽  
Vol 768 (2) ◽  
pp. 164 ◽  
Author(s):  
Paula Aguirre ◽  
Andrew J. Baker ◽  
Felipe Menanteau ◽  
Dieter Lutz ◽  
Linda J. Tacconi
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Submillimeter Galaxies

scholarly journals The Morphologies of Massive Galaxies at 1

2012 ◽  
Vol 8 (S295) ◽  
pp. 49-52
Author(s):  
V. A. Bruce ◽  
J. S. Dunlop ◽  
M. Cirasuolo ◽  
R. J. McLure ◽  
T. A. Targett ◽  
...  
Keyword(s):  
Star Formation ◽  
High Resolution ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Significant Fraction ◽  
Morphological Transformation ◽  
Massive Galaxies ◽  
Physical Mechanisms ◽  
Star Formation Activity ◽  
Simply Connected

AbstractWe have used high-resolution, HST WFC3/IR, near-infrared imaging to conduct a detailed bulge-disk decomposition of the morphologies of ≃ 200 of the most massive (M* > 1011 M⊙) galaxies at 1 < z < 3 in the CANDELS-UDS field. We find that, while such massive galaxies at low redshift are generally bulge-dominated, at redshifts 1<z<2 they are predominantly mixed bulge+disk systems, and by z > 2 they are mostly disk-dominated. Interestingly, we find that while most of the quiescent galaxies are bulge-dominated, a significant fraction (25–40%) of the most quiescent galaxies, have disk-dominated morphologies. Thus, our results suggest that the physical mechanisms which quench star-formation activity are not simply connected to those responsible for the morphological transformation of massive galaxies.

scholarly journals Twisted Jets from L1551 IRS5

2001 ◽  
Vol 200 ◽  
pp. 261-264
Author(s):  
Yoichi Itoh
Keyword(s):  
Infrared Spectroscopy ◽  
High Resolution ◽  
Spatial Variation ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Close Vicinity ◽  
Jet Structure ◽  
First Time ◽  
Bright Emission

We have carried out high-resolution near-infrared imaging observations of a protostar L1551 IRS 5 with the Subaru Telescope. The jet structure of IRS5 is resolved into two independent jets for the first time from the ground. Successive near-infrared spectroscopy has revealed that the jet emission is dominated by [Fe II] lines in the J and H-bands. While the visual-extinction reaches more than 20 mag in the close vicinity of IRS 5, it decreases rapidly at ∼1″ from IRS 5 and remains constant around 7 mag at larger distances. The twisted structure and bright emission knots are intrinsic to the jets, not due to a spatial variation of the extinction.

High-Resolution Near-Infrared Imaging and Polarimetry of Four Proto-Planetary Nebulae

2003 ◽  
Vol 126 (2) ◽  
pp. 848-862 ◽  
Author(s):  
Kate Y. L. Su ◽  
Bruce J. Hrivnak ◽  
Sun Kwok ◽  
Raghvendra Sahai
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Planetary Nebulae ◽  
Near Infrared Imaging
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