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 language | English (US) |
|---|---|
| Pages (from-to) | 1866-1882 |
| Number of pages | 17 |
| Journal | Astrophysical Journal |
| Volume | 690 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2009 |
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Keywords
- Galaxies: bulges
- Galaxies: spiral
ASJC Scopus subject areas
- Space and Planetary Science
- Astronomy and Astrophysics
Cite this
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 journal › Article
}
TY - JOUR
T1 - Stellar populations of late-type bulges at Z ≃ 1 in the hubble ultra deep field
AU - Hathi, N. P.
AU - Ferreras, I.
AU - Pasquali, A.
AU - Malhotra, S.
AU - Rhoads, J. E.
AU - Pirzkal, N.
AU - Windhorst, Rogier
AU - Xu, C.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
KW - Galaxies: bulges
KW - Galaxies: spiral
UR - http://www.scopus.com/inward/record.url?scp=65549157664&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=65549157664&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/690/2/1866
DO - 10.1088/0004-637X/690/2/1866
M3 - Article
AN - SCOPUS:65549157664
VL - 690
SP - 1866
EP - 1882
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
ER -