2006/12/02 by Charles Liu, Charles T. Liu, E. J. Hooper +9
Physics and Astronomy · #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/511328
published as Astrophys.J.658:249-257,2007 · 25 pages, 7 figures, accepted to ApJ
arxiv created 2006/12/02 · openalex publication_date 2007/03/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
We present multiwavelength observations of the very luminous "E+A" galaxy known as G515 (J152426.50+080908.0), including deep K s imaging, spatially resolved Hα spectroscopy, and radio observations. The data, together with detailed spectral synthesis of the galaxy's integrated stellar population, show that G515 is a ~1 Gyr old postmerger, poststarburst galaxy. We detect no Balmer line emission in the galaxy, although there is a small amount of [N II] λλ6548, 6583 Å emission. The galaxy's H I mass has a 2 σ upper limit of 1.0 × 10 9 M ☉ . IRAS detections in the 60 and 100 μm bands indicate a far-infrared luminosity of ~5.8 × 10 10 L ☉ . A small amount (~3 mJy) of radio continuum flux, which appears to be variable, has been detected. The data suggest that G515 may have once been an ultraluminous infrared galaxy, and may harbor a weak, dust-obscured active nucleus.