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Galaxy morphology to I=25 mag in the Hubble Deep Field | | R. G. Abraham
; N. R. Tanvir
; B. X. Santiago
; R. S. Ellis
; K. Glazebrook
; S. van den Bergh
; | | Date: |
9 Feb 1996 | | Subject: | astro-ph | | Abstract: | The morphological properties of galaxies between $21 {
m~mag} < I < 25 {
m~mag}$ in the {em Hubble Deep Field} are investigated using a quantitative classification system based on measurements of the central concentration and asymmetry of galaxian light. The class distribution of objects in the {em Hubble Deep Field} is strongly skewed towards highly asymmetric objects, relative to distributions from both the {em HST Medium Deep Survey} at $I < 22 {
m~mag}$ and an artificially redshifted sample of local galaxies. The steeply rising number count-magnitude relation for irregular/peculiar/merging systems at $I < 22 {~
m mag}$ reported in Glazebrook etal (1995a) continues to at least $I=25~{
m mag}$. Although these peculiar systems are predominantly blue at optical wavelengths, a significant fraction also exhibit red $U-B$ colours, which may indicate they are at high redshift. Beyond Glazebrook etal ’s magnitude limit the spiral counts appear to rise more steeply than high-normalization no-evolution predictions, whereas those of elliptical/S0 galaxies only slightly exceed such predictions and may turn-over beyond $I sim 24~{
m mag}$. These results are compared with those from previous investigations of faint galaxy morphology with HST and the possible implications are briefly discussed. The large fraction of peculiar/irregular/merging systems in the {em Hubble Deep Field} suggests that by $Isim 25 {
m~mag}$ the conventional Hubble system no longer provides an adequate description of the morphological characteristics of a high fraction of field galaxies. | | Source: | arXiv, astro-ph/9602044 | | Services: | Forum | Review | PDF | Favorites | |
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