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Date and Time of the Query: 2019-06-25 T05:21:39 PDT
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For refcode 2011MNRAS.411L..21F:
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Copyright by Royal Astronomical Society. 2011MNRAS.411L..21F The most recent burst of star formation in the massive elliptical galaxy NGC 1052 Fernandez-Ontiveros, J. A.; Lopez-Sanjuan, C.; Montes, M.; Prieto, M. A.; Acosta-Pulido, J. A. Abstract. High spatial resolution near-infrared (NIR) images of the central 24 x 24 arcsec^2^ (~2 x 2 kpc^2^) of the elliptical galaxy NGC 1052 reveal a total of 25 compact sources randomly distributed in the region. 15 of them exhibit H{alpha} luminosities an order of magnitude above the estimate for an evolved population of extreme horizontal branch stars. Their H{alpha} equivalent widths and optical-to-NIR spectral energy distributions are consistent with them being young stellar clusters aged <7 Myr. We consider this to be the first direct observation of spatially resolved star-forming regions in the central kiloparsecs of an elliptical galaxy. The sizes of these regions are <~11 pc and their median reddening is E(B-V) ~ 1 mag. According to previous works, NGC 1052 may have experienced a merger event about 1 Gyr ago. On the assumption that these clusters are spread with a similar density over the whole galaxy, the fraction of galaxy mass (5 x 10^-5^) and rate of star formation (0.01 M_o_ yr^-1^) involved suggest the merger event as the possible cause for the star formation we see today. Based on European Southern Observatory (ESO) Very Large Telescope (VLT) program 076.B-0493 and Hubble Space Telescope (HST) program IDs 3639, 6286, 7403 and 7886. Key words: techniques: high angular resolution, galaxies: individual: NGC 1052, galaxies: interactions, galaxies: nuclei, galaxies: star clusters: general
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