scholarly journals The Structure and Star Formation History of Early‐Type Galaxies in the Ultra Deep Field/GRAPES Survey

2006 ◽  
Vol 636 (1) ◽  
pp. 115-133 ◽  
Author(s):  
A. Pasquali ◽  
I. Ferreras ◽  
N. Panagia ◽  
E. Daddi ◽  
S. Malhotra ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Early Type ◽  
Formation History ◽  
History Of

VIPERS view of the star formation history of early-type galaxies

2015 ◽  
Author(s):  
M. Siudek ◽  
K. Malek ◽  
B. Garilli ◽  
M. Scodeggio ◽  
A. Fritz ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Early Type ◽  
Formation History ◽  
History Of

scholarly journals The Star Formation History of the Virgo Early‐Type Galaxy NGC 4435: TheSpitzerMid‐Infrared View

2007 ◽  
Vol 656 (1) ◽  
pp. 206-216 ◽  
Author(s):  
P. Panuzzo ◽  
O. Vega ◽  
A. Bressan ◽  
L. Buson ◽  
M. Clemens ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Early Type ◽  
Formation History ◽  
History Of ◽  
Early Type Galaxy

scholarly journals The role of minor mergers in the recent star formation history of early-type galaxies

2009 ◽  
Vol 394 (4) ◽  
pp. 1713-1720 ◽  
Author(s):  
Sugata Kaviraj ◽  
Sebastien Peirani ◽  
Sadegh Khochfar ◽  
Joseph Silk ◽  
Scott Kay
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Early Type ◽  
Formation History ◽  
History Of ◽  
Minor Mergers

scholarly journals Recent star formation in high-redshift early-type galaxies: insights from the rest-frame UV

2007 ◽  
Vol 3 (S245) ◽  
pp. 195-200
Author(s):  
S. Kaviraj ◽  
S. K. Yi ◽  
E. Gawiser ◽  
P. G. van Dokkum ◽  
S. Khochfar ◽  
...  
Keyword(s):  
Star Formation ◽  
Rest Frame ◽  
Hubble Space Telescope ◽  
High Redshift ◽  
Star Formation History ◽  
Early Type ◽  
Formation History ◽  
History Of ◽  
Type Population ◽  
The Universe

AbstractWe combine deep UBV RIzJK photometry from the MUSYC survey with redshifts from the COMBO-17 survey to study the rest-frame ultraviolet (UV) properties of 674 high-redshift (0.5 < z < 1) early-type galaxies, drawn from the Extended Chandra Deep Field South (E-CDFS). Galaxy morphologies are determined through visual inspection of Hubble Space Telescope (HST) images taken from the GEMS survey. We harness the sensitivity of the UV to young (<1 Gyrs old) stars to quantify the recent star formation history of the early-type population. We find compelling evidence that early-types of all luminosities form stars over the lifetime of the Universe, although the bulk of their star formation is already complete at high redshift. Luminous (−23 < M(V) < −20.5) early-types form 10-15 percent of their mass after z = 1, while their less luminous (M(V) > −20.5) counterparts form 30-60 percent of their mass in the same redshift range.

scholarly journals Star Formation History of Early-Type Galaxies with Tidal Debris in the S4G

2012 ◽  
Vol 10 (H16) ◽  
pp. 129-129
Author(s):  
Beatriz H. F. Ramos ◽  
Karín Menéndez-Delmestre ◽  
Taehyun Kim ◽  
Kartik Sheth ◽  
Keyword(s):  
Star Formation ◽  
Galaxy Formation ◽  
Stellar Structure ◽  
Star Formation History ◽  
Early Type ◽  
Uv Emission ◽  
Optical Images ◽  
Formation History ◽  
History Of ◽  
Stellar Masses

AbstractLocal early-type galaxies (ETGs), despite typically being associated to old stellar populations and passive evolution, have been in some cases observed to present peculiarities in their stellar structure, like disks and shells (e.g., Kormendy et al.1997, Rix, Carollo & Freeman 1999). Moreover, it has been observed that ETGs with such tidal features may present UV emission (Rampazzo et al.2007, Salim & Rich 2010). These properties make them relevant constraints to galaxy formation models. We are analysing the structure of nearby ETGs observed in the Spitzer Survey of Stellar Structure in Galaxies (S4G; Sheth et al.2010), which comprises the largest mid-IR survey of galaxies in the local Universe. We perform a 2D GALFIT decomposition of the 3.6μm images of 146 ETGs and examine their residual images. We identify tidal features in 17% of these, suggesting that a non-negligible ETGs fraction may have experienced (after the formation of the bulk of their stellar budget) merger events that have left signatures (Canalizo et al.2007). For 6 of these peculiar ETGs, we also applied GALFIT decomposition to public GALEX/UV and SDSS/optical images. With measurements in multiple bands, we applied SED fitting techniques to estimate star formation rates (SFR) and stellar masses for the galaxies and their tidal features. We find that these 6 peculiar ETGs present masses in agreement with the population of non-peculiar ETGs. However, SFRs are higher than what has been measured for the average ETG population (Shapiro et al.2010, SDSS MPA-JHU catalog). Based on the Kaviraj (2010) relation, we find that for these peculiar ETGs the estimated age of the most recent star formation event is less than 3Gyrs. Despite this indication of recent star formation, we have not found evidence of prominent UV emission in the tidal features (Marino et al.2010). We are currently extending our work to the full sample of peculiar ETGs identified in our sample.

The star-formation histories of early-type galaxies from ATLAS3D

2011 ◽  
Vol 7 (S284) ◽  
pp. 244-247 ◽  
Author(s):  
Richard M. McDermid ◽  
Katherine Alatalo ◽  
Leo Blitz ◽  
Maxime Bois ◽  
Frédéric Bournaud ◽  
...  
Keyword(s):  
Star Formation ◽  
Stellar Population ◽  
Abundance Ratio ◽  
Star Formation History ◽  
Early Type ◽  
Solar Abundance ◽  
Formation History ◽  
History Of ◽  
Free Parameters ◽  
Star Formation Histories

AbstractWe present an exploration of the integrated stellar populations of early-type galaxies (ETGs) from the ATLAS3D survey. We use two approaches: firstly the application of line-indices interpreted through single stellar population (SSP) models, which provide a single value of age, metallicity and abundance ratio. And secondly, by fitting a linear combination of SSP spectra to our data, smoothly weighted in the free parameters of age and metallicity, thereby inferring a star-formation history of these galaxies. Despite the significant differences in these approaches, we obtain generally consistent results, such that galaxies that are more massive appear older with enhanced abundance ratios using line indices, and have shorter star-formation histories weighted to early times. We highlight two limitations of the index-SSP approach. Firstly the SSP-equivalent ages belie the fact that ETGs are overwhelmingly composed of ancient stars. Secondly, the young stellar contributions implied in our star formation histories are required to obtain realistic UV-optical colours. We remark that, even fitting solar-abundance models, we can recover a star-formation duration that correlates with the measured alpha-enhancement, in agreement with other recent work.

scholarly journals Star formation history of early-type galaxies in low density environments

1998 ◽  
Vol 130 (2) ◽  
pp. 267-283 ◽  
Author(s):  
M. Longhetti ◽  
R. Rampazzo ◽  
A. Bressan ◽  
C. Chiosi
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Low Density ◽  
Early Type ◽  
Formation History ◽  
History Of

scholarly journals The star formation history of early-type galaxies as a function of mass and environment

2006 ◽  
Vol 370 (2) ◽  
pp. 702-720 ◽  
Author(s):  
M. S. Clemens ◽  
A. Bressan ◽  
B. Nikolic ◽  
P. Alexander ◽  
F. Annibali ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Early Type ◽  
Formation History ◽  
History Of

scholarly journals Star formation history of early-type galaxies in low density environments

1998 ◽  
Vol 130 (2) ◽  
pp. 251-265 ◽  
Author(s):  
M. Longhetti ◽  
R. Rampazzo ◽  
A. Bressan ◽  
C. Chiosi
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Low Density ◽  
Early Type ◽  
Formation History ◽  
History Of
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