This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| NGC 404 | |
|---|---|
| Name | NGC 404 |
| Type | SA(s)0− |
| Epoch | J2000 |
| Constellation | Pisces |
| Redshift | −0.000113 |
| Apparent mag v | 11.2 |
| Size v | 3.5×3.5′ |
NGC 404
NGC 404 is a lenticular galaxy in the constellation Pisces, notable for its proximity, ultraviolet ring, and low-luminosity nuclear activity. It has been observed across optical, ultraviolet, infrared, radio, and X-ray bands by instruments associated with institutions such as the Hubble Space Telescope, Galaxy Evolution Explorer, Spitzer Space Telescope, Chandra X-ray Observatory, and the Very Large Array. NGC 404 sits near the Local Group and has been a target for studies by researchers affiliated with universities and observatories including Harvard University, California Institute of Technology, Max Planck Institute for Astronomy, and European Southern Observatory.
NGC 404 is classified as an early-type lenticular galaxy with a smooth bulge and a faint spiral-like outer structure. Catalogs listing morphological classifications include the New General Catalogue, the Uppsala General Catalogue, and compilations by the Third Reference Catalogue of Bright Galaxies. Imaging campaigns from the Hubble Space Telescope and wide-field surveys such as the Sloan Digital Sky Survey reveal a compact stellar core surrounded by a ring of young stars detected by the Galaxy Evolution Explorer and imaged in infrared by Spitzer Space Telescope. Photometric analyses used by teams at institutions like the Max Planck Society and the National Aeronautics and Space Administration characterize NGC 404’s surface brightness profile using Sérsic models originally developed by Gérard de Vaucouleurs and later generalized by astronomers including José Luis Sérsic.
NGC 404 was first cataloged in the 19th century by observers compiling the New General Catalogue, and it has since been observed by a sequence of facilities from the Palomar Observatory to spaceborne telescopes. Early photographic plates from the Harvard College Observatory and visual observations by astronomers affiliated with the Royal Observatory Greenwich contributed to its classical catalog entry. Modern follow-up spectroscopy and imaging campaigns have involved the Keck Observatory, the Gemini Observatory, and the European Southern Observatory’s Very Large Telescope, while ultraviolet studies used data from the Galaxy Evolution Explorer and X-ray investigations employed the Chandra X-ray Observatory and the XMM-Newton mission. Radio mapping has been performed by the Very Large Array and arrays coordinated by the National Radio Astronomy Observatory.
Stellar population synthesis and spectral fitting routines developed in research groups at University of Cambridge, Princeton University, and University of California, Santa Cruz show NGC 404 hosts an old bulge population with a younger, metal-poor ring. Infrared photometry from Spitzer Space Telescope and the Wide-field Infrared Survey Explorer helped constrain dust and star-formation rates, while molecular gas studies using facilities like the Atacama Large Millimeter/submillimeter Array and the IRAM telescopes measure cold gas reservoirs. Kinematic mapping via integral-field units such as SAURON and MUSE reveals rotation and velocity dispersion profiles similar to other lenticulars cataloged in surveys like the ATLAS3D project. Chemical abundance patterns are compared to those in galaxies observed in the Sloan Digital Sky Survey and studied by groups at institutions such as University of Oxford and Yale University.
High-resolution imaging by the Hubble Space Telescope combined with X-ray data from the Chandra X-ray Observatory indicates low-ionization nuclear emission characteristic of LINERs identified in surveys led by researchers at Rutgers University and Pennsylvania State University. Radio continuum detections from the Very Large Array point to compact nuclear emission also studied in the context of low-luminosity active galactic nuclei by teams at MIT and Columbia University. Dynamical mass estimates for the central object utilize stellar and gas kinematics modeled with techniques advanced by astronomers at California Institute of Technology and the Institute of Astronomy, Cambridge, yielding constraints on a candidate intermediate-mass black hole comparable to masses discussed in work from University of Arizona and University of Toronto.
NGC 404 lies in a relatively isolated environment near the outskirts of the Local Group neighborhood and has been compared to nearby systems like M31 and M33 in environmental studies conducted by the Carnegie Institution for Science and the Max Planck Institute for Astrophysics. Evidence for a past minor merger or accretion event comes from the ultraviolet ring and disturbed HI detected by radio surveys from the Westerbork Synthesis Radio Telescope and the Very Large Array, with interpretations advanced in papers by researchers at University of Washington and University of Hawaii. The galaxy’s surroundings have been mapped in local volume catalogs compiled by the Extragalactic Distance Database and teams associated with the Space Telescope Science Institute.
Distance estimates for NGC 404 derive from methods used across distance-scale programs such as the Cepheid variable calibrations championed by the Hubble Space Telescope Key Project, tip of the red giant branch analyses employed by the Carnegie-Chicago Hubble Program, and surface-brightness fluctuation techniques used by groups at the University of Michigan. Typical distances place the galaxy at a few megaparsecs, with heliocentric radial velocity measurements recorded in databases maintained by the NASA/IPAC Extragalactic Database and the SIMBAD Astronomical Database. Proper motion studies and local flow models developed by the Cosmicflows team and researchers at University of California, Berkeley contribute to understanding NGC 404’s motion relative to the Local Group and neighboring galaxies.
Category:Lenticular galaxies