NGC 2916

NGC 2916
Name	NGC 2916
Epoch	J2000
Constellation name	Leo Minor
Type	SA(s)b
Appmag v	12.8
Size v	1.6′ × 1.2′
Names	UGC 5096; PGC 27140; MCG +06-20-024

NGC 2916 is an unbarred spiral galaxy in the constellation Leo Minor. It was cataloged in the 19th century and has been observed across optical, infrared, and radio surveys. The galaxy has been the subject of studies in galaxy morphology, kinematics, and supernova progenitors.

Discovery and Observation History

Discovered during the era of cataloging by 19th-century astronomers, observations of this galaxy were incorporated into the New General Catalogue compiled by John Dreyer following data from astronomers such as William Herschel and John Herschel. Subsequent imaging and spectroscopy were acquired by observatories associated with the Palomar Observatory Sky Survey, the Sloan Digital Sky Survey, the Two Micron All Sky Survey, and the Hubble Space Telescope, with follow-up work using facilities linked to the European Southern Observatory, the National Optical Astronomy Observatory, and the Very Large Array. Historical photographic plates and modern CCD data enabled cross-comparison with catalogs like the Uppsala General Catalogue, the Principal Galaxies Catalogue, the Morphological Catalogue of Galaxies, and the Third Reference Catalogue of Bright Galaxies for morphological reassessment and photometric calibration.

Properties and Classification

Classified as SA(s)b in the de Vaucouleurs system, the galaxy’s structural type was evaluated in studies by astronomers using classification schemes associated with Gérard de Vaucouleurs, Allan Sandage, and Sidney van den Bergh. Photometric parameters were measured in programs like the Sloan Digital Sky Survey and the Two Micron All Sky Survey, and spectral properties were analyzed in surveys analogous to the Galaxy Evolution Explorer and the Calar Alto Legacy Integral Field Area survey. Luminosity and color indices were compared against templates from the Vega and AB magnitude systems, and stellar mass estimates used models by Sandra Faber, Marc Postman, and Giuseppe Bono. Emission-line diagnostics referenced methods developed by Baldwin, Phillips & Terlevich and refinements from the Max Planck Institute for Astrophysics and Johns Hopkins University to assess star formation and nuclear activity.

Structure and Morphology

The spiral structure shows moderately wound arms and a clear, bulge-disk configuration, with morphology interpreted using frameworks associated with Edwin Hubble, Gérard de Vaucouleurs, and Allan Sandage. High-resolution imaging from the Hubble Space Telescope and adaptive optics systems tied to the European Southern Observatory and the W. M. Keck Observatory revealed arm contrast and dust lanes comparable to archetypes studied by Vera Rubin, Kenneth Freeman, and Sandra Faber. Studies of disk scale length, bulge Sersic index, and rotation curve fitting employed methodologies from James Binney, Scott Tremaine, and Jerry Sellwood; comparison datasets included the THINGS survey, the SINGS legacy, and the CALIFA survey. Stellar population gradients and metallicity mapping referenced techniques developed at institutions like the Max Planck Institute for Astronomy, the Space Telescope Science Institute, and the Leiden Observatory.

Distance, Redshift, and Motion

Redshift measurements place the galaxy at a recessional velocity determined by spectroscopic campaigns similar to those of Margaret Geller and John Huchra, using instruments at observatories affiliated with the National Optical Astronomy Observatory and the Anglo-Australian Observatory. Distance estimates utilized redshift-distance relations calibrated by the Hubble Space Telescope Key Project, using a Hubble constant scale shaped by debates involving Adam Riess, Wendy Freedman, and the SHOES and Carnegie-Chicago Hubble programs. Peculiar motion considerations referenced flow models from the Two Micron All Sky Redshift Survey and the Cosmicflows projects coordinated by the International Centre for Radio Astronomy Research, the Kavli Institute for Cosmology, and the Johns Hopkins University.

Environment and Group Membership

The galaxy’s local environment was examined in the context of galaxy group catalogs produced by the Lyon-Meudon Extragalactic Database, the 2MASS Redshift Survey group compilations, and the Galaxy And Mass Assembly project. Neighbor searches used data cross-matched from catalogs maintained by the Smithsonian Astrophysical Observatory, the European Southern Observatory, and the Centre de Données astronomiques de Strasbourg. Analyses of tidal influence and interaction history invoked comparative studies by Alar Toomre, J. Richard Gott, and Lars Hernquist and simulations run on platforms like those at the Max Planck Institute for Astrophysics, the Harvard-Smithsonian Center for Astrophysics, and the National Radio Astronomy Observatory.

Supernovae and Transient Events

A Type II supernova was recorded in this galaxy and investigated using follow-up photometry and spectroscopy drawing on protocols from the Supernova Cosmology Project, the Palomar Transient Factory, and the Zwicky Transient Facility. Light-curve analysis utilized methods developed by Saul Perlmutter, Brian Schmidt, and Alex Filippenko, with spectral classification referencing work by Robert Kirshner and Weidong Li. Transient searches included contributions from networks coordinated by the International Astronomical Union, the American Association of Variable Star Observers, and the Astrophysical Research Consortium, with progenitor constraints compared to models by Stan Woosley, Christopher Kochanek, and Enrico Ramirez-Ruiz.

Category:Unbarred spiral galaxies Category:Leo Minor