NGC 5523: An Isolated Product of Soft Galaxy Mergers?
arXiv:1611.05968 · doi:10.1051/0004-6361/201628070
Abstract
Multi-band images of the very isolated spiral galaxy NGC 5523 show a number of unusual features consistent with NGC 5523 having experienced a significant merger: (1) Near-infrared (NIR) images from the Spitzer Space Telescope (SST) and the WIYN 3.5-m telescope reveal a nucleated bulge-like structure embedded in a spiral disk. (2) The bulge is offset by ~1.8 kpc from a brightness minimum at the center of the optically bright inner disk. (3) A tidal stream, possibly associated with an ongoing satellite interaction, extends from the nucleated bulge along the disk. We interpret these properties as the results of one or more non-disruptive mergers between NGC 5523 and companion galaxies or satellites, raising the possibility that some galaxies become isolated because they have merged with former companions.
arXiv comment7 pages, 6 figures, 7 tables
References in corpus (21)
- The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
- How Do Disks Survive Mergers?
- Stellar Tidal Streams in Spiral Galaxies of the Local Volume: A Pilot Survey with Modest Aperture Telescopes
- Galaxy mergers with various mass ratios: properties of remnants
- Masses of star clusters in the nuclei of bulge-less spiral galaxies
- Lopsided Spiral Galaxies and a Limit on the Galaxy Accretion Rate
- Tidal Streams as Probes of the Galactic Potential
- The Effect of Gas Fraction on the Morphology and Time-scales of Disc Galaxy Mergers
- The AMIGA project. I. Optical characterization of the CIG catalog
- Only the Lonely: H I Imaging of Void Galaxies
- B and V CCD Photometry of Southern, Extreme Late-Type Spiral Galaxies
- On the formation of extended galactic disks by tidally disrupted dwarf galaxies
- Star formation rates and mass distributions in interacting galaxies
- Lopsided galaxies: the case of NGC 891
- High-Resolution Optical Rotation Curves of Low-Luminosity Spiral Galaxies
- Tidally Induced Offset Disks in Magellanic Spiral Galaxies
- Global lopsided instability in a purely stellar galactic disc
- Measurement of non-axisymmetry in centres of advanced mergers of galaxies
- Nuclear Properties of Nearby Spiral Galaxies from Hubble Space Telescope NICMOS imaging and STIS Spectroscopy
- The Odd Offset between the Galactic Disk and Its Bar in NGC 3906
- The Arecibo Galaxy Environment Survey IX: The Isolated Galaxy Sample