New Clues on the Nature of Extremely Red Galaxies

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dc.creatorCimatti, A.
dc.creatorDaddi, E.
dc.creatorAlighieri, S. di Serego
dc.creatorPozzetti, L.
dc.creatorMannucci, F.
dc.creatorRenzini, A.
dc.creatorOliva, E.
dc.creatorZamorani, G.
dc.creatorAndreani, P.
dc.creatorRöttgering, H. J. A.
dc.date1999-10-08
dc.date.accessioned2026-07-07T02:33:45Z
dc.date.available2026-07-07T02:33:45Z
dc.descriptionWe present near-infrared VLT-UT1+ISAAC spectroscopy of a sample of 9 extremely red galaxies (ERGs) with R-K>5 and K<19.0. Neither strong emission lines (F_lim<1-5 10^{-16} erg s^{-1}cm^{-2}) nor continuum breaks are detected. From near-infrared spectrophotometry, complemented with broad-band optical and near-IR photometry, we estimate ``spectro-photometric'' redshifts to be in the range of 0.8<z_sphot<1.8. We derive upper limits on the star formation rates in range of SFR<6-30h_50^{-2} M_solar yr^{-1}. Two of the observed ERGs are dusty starburst candidates because they require strong dust reddening to reproduce their global spectral energy distributions. The other ERGs are consistent with being dustless old passively evolved spheroidals at z>0.8. We discuss the general implications of our findings in relation with the problem of the formation of early type galaxies.
dc.description6 pages, 2 figures. Astronomy & Astrophysics (Letters), in press
dc.identifierhttps://arxiv.org/abs/astro-ph/9910163
dc.identifierhttp://arxiv.org/abs/astro-ph/9910163
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14974
dc.subjectAstrophysics
dc.titleNew Clues on the Nature of Extremely Red Galaxies
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