Star formation losses due to tidal debris in `hierarchical' galaxy formation
Bottom-up hierarchical formation of dark matter haloes is not as monotonic as implicitly assumed in the Press-Schechter formalism: matter can be ejected into tidal tails, shells or low density `atmospheres'. The implications that the possible truncation of star formation in these tidal `debris&...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2001
|
| _version_ | 1826278976256999424 |
|---|---|
| author | Roukema, B Ninin, S Devriendt, J Bouchet, F Guiderdoni, B Mamon, G |
| author_facet | Roukema, B Ninin, S Devriendt, J Bouchet, F Guiderdoni, B Mamon, G |
| author_sort | Roukema, B |
| collection | OXFORD |
| description | Bottom-up hierarchical formation of dark matter haloes is not as monotonic as implicitly assumed in the Press-Schechter formalism: matter can be ejected into tidal tails, shells or low density `atmospheres'. The implications that the possible truncation of star formation in these tidal `debris' may have for observational galaxy statistics are examined here using the ArFus N-body plus semi-analytical galaxy modelling software. Upper and lower bounds on stellar losses implied by a given set of N-body simulation output data can be investigated by choice of the merging/identity criterion of haloes between successive N-body simulation output times. A median merging/identity criterion is defined and used to deduce an upper estimate of possible star formation and stellar population losses. A largest successor merging/identity criterion is defined to deduce an estimate which minimises stellar losses. In the N-body simulations studied, the debris losses are short range in length and temporary; maximum loss is around 16%. The induced losses for star formation and luminosity functions are strongest (losses of 10%-30%) for low luminosity galaxies and at intermediate redshifts (1 < z < 3). This upper bound on likely losses is smaller than present observational uncertainties. Hence, Press-Schechter based galaxy formation models are approximately valid despite ignoring loss of debris, provided that dwarf galaxy statistics are not under study. |
| first_indexed | 2024-03-06T23:51:56Z |
| format | Journal article |
| id | oxford-uuid:72e71fc4-b473-4556-b712-7b411174e0cf |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:51:56Z |
| publishDate | 2001 |
| record_format | dspace |
| spelling | oxford-uuid:72e71fc4-b473-4556-b712-7b411174e0cf2022-03-26T19:53:03ZStar formation losses due to tidal debris in `hierarchical' galaxy formationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:72e71fc4-b473-4556-b712-7b411174e0cfEnglishSymplectic Elements at Oxford2001Roukema, BNinin, SDevriendt, JBouchet, FGuiderdoni, BMamon, GBottom-up hierarchical formation of dark matter haloes is not as monotonic as implicitly assumed in the Press-Schechter formalism: matter can be ejected into tidal tails, shells or low density `atmospheres'. The implications that the possible truncation of star formation in these tidal `debris' may have for observational galaxy statistics are examined here using the ArFus N-body plus semi-analytical galaxy modelling software. Upper and lower bounds on stellar losses implied by a given set of N-body simulation output data can be investigated by choice of the merging/identity criterion of haloes between successive N-body simulation output times. A median merging/identity criterion is defined and used to deduce an upper estimate of possible star formation and stellar population losses. A largest successor merging/identity criterion is defined to deduce an estimate which minimises stellar losses. In the N-body simulations studied, the debris losses are short range in length and temporary; maximum loss is around 16%. The induced losses for star formation and luminosity functions are strongest (losses of 10%-30%) for low luminosity galaxies and at intermediate redshifts (1 < z < 3). This upper bound on likely losses is smaller than present observational uncertainties. Hence, Press-Schechter based galaxy formation models are approximately valid despite ignoring loss of debris, provided that dwarf galaxy statistics are not under study. |
| spellingShingle | Roukema, B Ninin, S Devriendt, J Bouchet, F Guiderdoni, B Mamon, G Star formation losses due to tidal debris in `hierarchical' galaxy formation |
| title | Star formation losses due to tidal debris in `hierarchical' galaxy
formation |
| title_full | Star formation losses due to tidal debris in `hierarchical' galaxy
formation |
| title_fullStr | Star formation losses due to tidal debris in `hierarchical' galaxy
formation |
| title_full_unstemmed | Star formation losses due to tidal debris in `hierarchical' galaxy
formation |
| title_short | Star formation losses due to tidal debris in `hierarchical' galaxy
formation |
| title_sort | star formation losses due to tidal debris in hierarchical galaxy formation |
| work_keys_str_mv | AT roukemab starformationlossesduetotidaldebrisinhierarchicalgalaxyformation AT ninins starformationlossesduetotidaldebrisinhierarchicalgalaxyformation AT devriendtj starformationlossesduetotidaldebrisinhierarchicalgalaxyformation AT bouchetf starformationlossesduetotidaldebrisinhierarchicalgalaxyformation AT guiderdonib starformationlossesduetotidaldebrisinhierarchicalgalaxyformation AT mamong starformationlossesduetotidaldebrisinhierarchicalgalaxyformation |