Two more disk galaxies with global gas counterrotation

Abstract

We report a discovery of extended counterrotating gaseous disks in early-type disk galaxies NGC 2551 and NGC 5631. To find them, we have undertaken complex spectral observations including integral-field spectroscopy for the central parts of the galaxies and long-slit deep spectroscopy to probe the external parts. The line-of-sight velocity fields have been constructed and compared to the photometric structure of the galaxies. As a result, we have revealed full-size counterrotating gaseous disks, the one coplanar to the stellar disk in NGC 2551 and the other inclined to the main stellar disk in NGC 5631. We suggest that we observe the early stages of minor-merger events which may be two different stages of the process of lenticular galaxy formation in rather sparse environments.

8 pages, 8 EPS figures, accepted for publication in ApJ

References in corpus (26)

• The Sloan Digital Sky Survey: Technical Summary
• MILES: A Medium resolution INT Library of Empirical Spectra
• The Sixth Data Release of the Sloan Digital Sky Survey
• The SAURON project - V. Integral-field emission-line kinematics of 48 elliptical and lenticular galaxies
• The GALEX Ultraviolet Atlas of Nearby Galaxies
• The SAURON project. I. The panoramic integral-field spectrograph
• The SAURON project. II. Sample and early results
• The SAURON project - III. Integral-field absorption-line kinematics of 48 elliptical and lenticular galaxies
• The SCORPIO focal reducer
• Bulge-Disk Decomposition of 659 Spiral and Lenticular Galaxy Brightness Profiles
• Nearby Optical Galaxies: Selection of the Sample and Identification of Groups
• A Search for Counter-Rotating Stars in S0 Galaxies
• Formation of Massive Counterrotating Disks in Spiral Galaxies
• Ionized gas and stellar kinematics of seventeen nearby spiral galaxies
• A Broad Search for Counterrotating Gas and Stars: Evidence for Mergers and Accretion
• A new catalogue of ISM content of normal galaxies
• A Counter-rotating Bulge in the Sb Galaxy NGC 7331
• Minor-axis velocity gradients in spirals and the case of inner polar disks
• NGC 4138 - A Case Study in Counterrotating Disk Formation
• Nature of nuclear rings in unbarred galaxies: NGC 7742 and NGC 7217
• NGC5719/13: interacting spirals forming a counter-rotating stellar disc
• Spectral Variability of LBV star V532 (Romano's star)
• Warped polar ring in the Arp 212 galaxy
• The planets capture model of V838 Monocerotis: conclusions for the penetration depth of the planet/s
• NGC 7331: the Galaxy with the Multicomponent Central Region
• NGC 7468: a galaxy with an inner polar disk

Cited by in corpus (24)

• Spitzer Observations of Passive and Star Forming Early-type Galaxies: an Infrared Color-Color Sequence
• Formation of S0 galaxies through mergers. Evolution in the Tully-Fisher relation since $z\sim 1$
• A Spitzer-IRS Spectroscopic atlas of early-type galaxies in the Revised Shapley-Ames Catalog
• Decoupled gas kinematics in isolated S0 galaxies
• Extreme kinematic misalignment in IllustrisTNG galaxies: the origin, structure and internal dynamics of galaxies with a large-scale counterrotation
• On the origin of the angular momentum properties of gas and dark matter in galactic halos and its implications
• The gas kinematics, excitation, and chemistry, in connection with star formation, in lenticular galaxies
• Lenticular galaxy IC 719: current building of the counterrotating large-scale stellar disk
• Evolution along the sequence of S0 Hubble types induced by dry minor mergers. II - Bulge-disk coupling in the photometric relations through merger-induced internal secular evolution
• Metallicity and ionization state of the gas in polar-ring galaxies
• On the Nature of the Apparent Ring Galaxy SDSS J075234.33+292049.8
• Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk
• External gas accretion provides a fresh gas supply to the active S0 galaxy NGC 5077
• Disk heating and bending instability in galaxies with counterrotation
• 3D spectroscopic study of galactic rings: formation and kinematics
• Tilted outer and inner structures in edge-on galaxies?
• The UV window on counter rotating ETGs: insight from SPH simulations with chemo-photometric implementation
• The external origin of the polar gaseous disk of the S0 galaxy IC 5181
• Star Formation History at the Centers of Lenticular Galaxies with Bars and Purely Exponential Outer Disks from SAURON Data
• Structure of the Galaxies in the NGC 80 Group
• Kinematic misalignment as a driver of black hole activity in galaxies with external interactions
• Adaptive optics imaging of the nuclei of Seyfert 2 galaxies: An unexpectedly high incidence of nuclear stellar rings
• Evidence for Ultra-Diffuse Galaxy Formation Through Tidal Heating of Normal Dwarfs
• HII versus HI in the `green valley' galaxies: direct comparison