Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/33131
DC Field | Value | Language |
---|---|---|
dc.contributor.author | BUZZONI, Alberto | en_US |
dc.contributor.author | Cellone,S. A. | en_US |
dc.contributor.author | SARACCO, Paolo | en_US |
dc.contributor.author | ZUCCA, Elena | en_US |
dc.date.accessioned | 2023-02-02T16:45:15Z | - |
dc.date.available | 2023-02-02T16:45:15Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/33131 | - |
dc.description.abstract | In this third paper of a series we present Johnson-Gunn B, g, V, r, i, z multicolour photometry for 79 objects, including a significant fraction of the faintest galaxies around NGC 5044, assessing group membership on the basis of apparent morphology (through accurate Sérsic-profile fitting) and low-resolution (R= 500-1000) optical spectroscopy to estimate the redshift for 21 objects. Early- and late-type systems are found to be clearly separate in Sérsic parameter space, with the well-known luminosity versus shape relation being mostly traced by different morphological types spanning different ranges in the shape parameter n. A significantly blue colour is confirmed for Magellanic irregulars (Sm/Ims), while a drift toward bluer integrated colours is also an issue for dwarf ellipticals (dEs). Both features point to moderate but pervasive star-formation activity even among nominally 'quiescent' stellar systems. Together, dEs and Ims provide the bulk of the galaxy luminosity function, around M(g) ≃-18.0 ± 1.5, while the S0 and dwarf spheroidal (dSph) components dominate the bright and faint-end tails of the distribution respectively. This special mix places the NGC 5044 Group just 'midway' between the high-density cosmic aggregation scale typical of galaxy clusters and the low-density environment of looser galaxy clumps like our Local Group. The bright mass of the 136 member galaxies with available photometry and morphological classification, as inferred from appropriate M/L model fitting, amounts to a total of 2.3 × 1012 M⊙. This is one seventh of the total dynamical mass of the group, according to its X-ray emission. The current star-formation rate within the group turns to be about 23 M⊙ yr-1, a figure that may however be slightly increased as a result of the evident activity among dwarf ellipticals, as shown by enhanced Hβ emission in their spectra. Lick narrow-band indices have been computed for 17 galaxies, probing all the relevant atomic and molecular features in the 4300-5800 Å wavelength range. Dwarf ellipticals are found to share a subsolar metallicity (-1.0 ≲ [Fe/H] ≲- 0.5), with a clear decoupling between iron and α elements, as already established for high-mass systems. Both dEs and dS0s are consistent with a high age, about one Hubble time, although a possible bias towards higher values of age may be induced by the gas emission affecting the Hβ strength. | en_US |
dc.language.iso | eng | en_US |
dc.title | Evolutionary properties of the low-luminosity galaxy population in the NGC5044 Group | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1111/j.1365-2966.2012.20267.x | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/420/4/3427/974288 | en_US |
dc.identifier.url | https://arxiv.org/pdf/1112.4493.pdf | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 420 | en_US |
dc.relation.firstpage | 3427 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 4 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | ARG | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2012MNRAS.420.3427B | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0002-6514-1870 | - |
crisitem.author.orcid | 0000-0003-3959-2595 | - |
crisitem.author.orcid | 0000-0002-5845-8132 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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mnras0420-3427.pdf | Pdf editoriale | 1.18 MB | Adobe PDF | View/Open |
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