Stellar populations of late-type bulges at Z ≃ 1 in the hubble ultra deep field

N. P. Hathi, I. Ferreras, A. Pasquali, S. Malhotra, J. E. Rhoads, N. Pirzkal, Rogier Windhorst, C. Xu

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We combine the exceptional depth of the Hubble Ultra Deep Field (HUDF) images and the deep GRism Advanced Camera for Surveys Program for Extragalactic Science (GRAPES) grism spectroscopy to explore the stellar populations of 34 bulges belonging to late-type galaxies at 0.8 ≤ z ≤ 1.3. The sample is selected based on the presence of a noticeable 4000 break in their GRAPES spectra, and by visual inspection of the HUDF images. The HUDF images are used to measure the bulge color and Sérsic index. The narrow extraction of the GRAPES data around the galaxy center enables us to study the spectrum of the bulges in these late-type galaxies, minimizing the contamination from the disk of the galaxy. We use the low-resolution (R ≃ 50) spectral energy distribution (SED) around the 4000 break to estimate redshifts and stellar ages. The SEDs are compared with models of galactic chemical evolution to determine the stellar mass, and to characterize the age distribution. We find that (1) the average age of late-type bulges in our sample is ∼1.3 Gyr with stellar masses in the range 106.5-1010 M . (2) Late-type bulges are younger than early-type galaxies at similar redshifts and lack a trend of age with respect to redshift, suggesting a more extended period of star formation. (3) Bulges and inner disks in these late-type galaxies show similar stellar populations, and (4) late-type bulges are better fitted by exponential surface brightness profiles. The overall picture emerging from the GRAPES data is that, in late-type galaxies at z ≃ 1 bulges form through secular evolution and disks via an inside-out process.

Original languageEnglish (US)
Pages (from-to)1866-1882
Number of pages17
JournalAstrophysical Journal
Volume690
Issue number2
DOIs
StatePublished - 2009

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galaxies
cameras
stellar mass
age structure
spectroscopy
chemical evolution
galactic evolution
spectral energy distribution
programme
science
star formation
inspection
emerging
brightness
contamination
energy
trends
color
estimates
profiles

Keywords

  • Galaxies: bulges
  • Galaxies: spiral

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hathi, N. P., Ferreras, I., Pasquali, A., Malhotra, S., Rhoads, J. E., Pirzkal, N., ... Xu, C. (2009). Stellar populations of late-type bulges at Z ≃ 1 in the hubble ultra deep field. Astrophysical Journal, 690(2), 1866-1882. https://doi.org/10.1088/0004-637X/690/2/1866

Stellar populations of late-type bulges at Z ≃ 1 in the hubble ultra deep field. / Hathi, N. P.; Ferreras, I.; Pasquali, A.; Malhotra, S.; Rhoads, J. E.; Pirzkal, N.; Windhorst, Rogier; Xu, C.

In: Astrophysical Journal, Vol. 690, No. 2, 2009, p. 1866-1882.

Research output: Contribution to journalArticle

Hathi, NP, Ferreras, I, Pasquali, A, Malhotra, S, Rhoads, JE, Pirzkal, N, Windhorst, R & Xu, C 2009, 'Stellar populations of late-type bulges at Z ≃ 1 in the hubble ultra deep field', Astrophysical Journal, vol. 690, no. 2, pp. 1866-1882. https://doi.org/10.1088/0004-637X/690/2/1866
Hathi NP, Ferreras I, Pasquali A, Malhotra S, Rhoads JE, Pirzkal N et al. Stellar populations of late-type bulges at Z ≃ 1 in the hubble ultra deep field. Astrophysical Journal. 2009;690(2):1866-1882. https://doi.org/10.1088/0004-637X/690/2/1866
Hathi, N. P. ; Ferreras, I. ; Pasquali, A. ; Malhotra, S. ; Rhoads, J. E. ; Pirzkal, N. ; Windhorst, Rogier ; Xu, C. / Stellar populations of late-type bulges at Z ≃ 1 in the hubble ultra deep field. In: Astrophysical Journal. 2009 ; Vol. 690, No. 2. pp. 1866-1882.
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