scholarly journals Self‐Gravitating Eccentric Disk Models for the Double Nucleus of M31

2004 ◽  
Vol 611 (1) ◽  
pp. 245-269 ◽  
Author(s):  
Robert M. Salow ◽  
Thomas S. Statler
Keyword(s):  
Eccentric Disk ◽  
Double Nucleus

The Double Nucleus and Central Black Hole of M31

1999 ◽  
Vol 522 (2) ◽  
pp. 772-792 ◽  
Author(s):  
John Kormendy ◽  
Ralf Bender
Keyword(s):  
Black Hole ◽  
Central Black Hole ◽  
Double Nucleus

scholarly journals Ultradiffuse galaxies in the IC 1459 group from the VEGAS survey

2020 ◽  
Vol 494 (4) ◽  
pp. 5293-5297
Author(s):  
Duncan A Forbes ◽  
Bililign T Dullo ◽  
Jonah Gannon ◽  
Warrick J Couch ◽  
Enrichetta Iodice ◽  
...  
Keyword(s):  
Globular Clusters ◽  
Compact Objects ◽  
Early Type ◽  
Group Members ◽  
Measurement Uncertainties ◽  
Stellar Masses ◽  
Double Nucleus ◽  
Early Type Galaxy

ABSTRACT Using deep g, r, i imaging from the VST Early-type GAlaxy Survey (VEGAS), we have searched for ultradiffuse galaxies (UDGs) in the IC 1459 group. Assuming they are group members, we identify nine galaxies with physical sizes and surface brightnesses that match the UDG criteria within our measurement uncertainties. They have mean colours of g − i = 0.6 and stellar masses of ∼108 M⊙. Several galaxies appear to have associated systems of compact objects, e.g. globular clusters. Two UDGs contain a central bright nucleus, with a third UDG revealing a remarkable double nucleus. This appears to be the first reported detection of a double nucleus in a UDG – its origin is currently unclear.

scholarly journals IR Geminorum: Complex Disk Behavior During Quiescence

2004 ◽  
Vol 191 ◽  
pp. 259-262
Author(s):  
Zongyun Li ◽  
Kam-Ching Leung ◽  
C. Martin Gaskell
Keyword(s):  
Orbital Period ◽  
V Band ◽  
Eccentric Disk ◽  
Nearly Continuous ◽  
Periodic Cycles

AbstractWe have carried out nearly continuous V-band photometry from Yunnan Observatory (China) and Behlen Observatory (Nebraska, USA) of IR Gem for over six days starting three days after a normal outburst in January 2002. Our observations show that the behavior of this SU UMa star is unexpectedly complicated, and that for IR Gem, quiescence is potentially more interesting than outbursts. We find a photometric modulation with a period of 98.5 min, exactly equal to the spectroscopically determined orbital period. We tentatively attribute this to heating of the secondary. During the first three days a modulation appeared with a period 5% longer than the orbital period. We suggest that this might be a signature of apsidal precession of an eccentric disk. During the middle of our period of observations a modulation with a period 3% shorter than the orbital period appeared. We invoke nodal precession to explain this. A slower modulation we found with a period of about 1.7 d is roughly consistent with the expected period of nodal precession. There is a puzzling 4.3 d period modulation that we suspect may be the result of beating between apsidal and nodal precession frequencies. We also find inexplicable quasi-periodic cycles on timescales drifting from ~ 0.2 to ~ 0.4 days.

scholarly journals The Twin-Nucleus Merging Galaxy MKN 266

1989 ◽  
Vol 134 ◽  
pp. 452-453
Author(s):  
J.B. Hutchings ◽  
S.G. Neff ◽  
J.H. van Gorkom
Keyword(s):  
Optical Emission ◽  
Physical Parameters ◽  
List Type ◽  
Imaging Data ◽  
Ccd Imaging ◽  
Spatially Resolved ◽  
The Galaxy ◽  
Extended Complex ◽  
Double Nucleus ◽  
Narrow Bands

We present results of observations of the double-nucleus galaxy Markarian 266 (NGC 5256) from 3 principal sources. These are 1:CCD imaging with the Canada-France-Hawaii telescope in broad and narrow bands. These indicate that the galaxy has extended, complex, faint outer plumes which indicate that a recent merger has occurred. The narrow-band images reveal remarkable knotty structure of the [O III] emitting gas, extending over the whole central part of the galaxy. This is not seen in Hα (see figure 1).2:21cm imaging with the VLA, covering velocity space near that of the optical nuclei. The continuum image reveals resolved triple structure, with the two outer peaks coincident with the optical nuclei. The 21cm velocity profiles indicate the presence of considerable H I absorption near the optical emission line velocities.3:Spatially resolved optical spectroscopy with the DAO 1.8m telescope. These data reveal the details of the [O III] velocity field and some of the physical parameters of the gas. The complexity and extended nature of the gas explains some conflicting redshift measurements in the literature. Together with the imaging data, we derive estimates of nuclear reddening and luminosity.

scholarly journals Revealing the Double Nucleus of NGC 4490

2020 ◽  
Vol 891 (1) ◽  
pp. 11
Author(s):  
Al Lawrence ◽  
C. R. Kerton ◽  
Curtis Struck ◽  
Beverly J. Smith
Keyword(s):  
Double Nucleus

The double-nucleus galactic merger MKN 463

1989 ◽  
Vol 97 ◽  
pp. 1306 ◽  
Author(s):  
J. B. Hutchings ◽  
S. G. Neff
Keyword(s):  
Double Nucleus
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