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The star formation history of the dwarf irregular galaxy SagDIG

Published online by Cambridge University Press:  01 December 2006

E. V. Held ,
Y. Momany ,
L. Rizzi ,
I. Saviane ,
L. R. Bedin ,
M. Gullieuszik ,
G. Bertelli ,
E. Nasi ,
M. Clemens  and
M. R. Rich
...Show all authors
E. V. Held
Affiliation:
Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, I-35122 Padova, Italy email: enrico.held@oapd.inaf.it, yazan.almomany@oapd.inaf.it, marco.gullieuszik@oapd.inaf.it, gianpaolo.bertelli@oapd.inaf.it, emma.nasi@oapd.inaf.it, marcel.clemens@oapd.inaf.it
Y. Momany
Affiliation:
Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, I-35122 Padova, Italy email: enrico.held@oapd.inaf.it, yazan.almomany@oapd.inaf.it, marco.gullieuszik@oapd.inaf.it, gianpaolo.bertelli@oapd.inaf.it, emma.nasi@oapd.inaf.it, marcel.clemens@oapd.inaf.it
L. Rizzi
Affiliation:
Institute for Astronomy, Univ. of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA email: rizzi@ifa.hawaii.edu
I. Saviane
Affiliation:
European Southern Observatory, Casilla 19001, Santiago 19, Chile email: isaviane@eso.org
L. R. Bedin
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany email: lbedin@eso.org
M. Gullieuszik
Affiliation:
Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, I-35122 Padova, Italy email: enrico.held@oapd.inaf.it, yazan.almomany@oapd.inaf.it, marco.gullieuszik@oapd.inaf.it, gianpaolo.bertelli@oapd.inaf.it, emma.nasi@oapd.inaf.it, marcel.clemens@oapd.inaf.it Dipartimento di Astronomia, Univ. di Padova, v.lo dell'Osservatorio 3, I-35122 Padova, Italy
G. Bertelli
Affiliation:
Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, I-35122 Padova, Italy email: enrico.held@oapd.inaf.it, yazan.almomany@oapd.inaf.it, marco.gullieuszik@oapd.inaf.it, gianpaolo.bertelli@oapd.inaf.it, emma.nasi@oapd.inaf.it, marcel.clemens@oapd.inaf.it
E. Nasi
Affiliation:
Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, I-35122 Padova, Italy email: enrico.held@oapd.inaf.it, yazan.almomany@oapd.inaf.it, marco.gullieuszik@oapd.inaf.it, gianpaolo.bertelli@oapd.inaf.it, emma.nasi@oapd.inaf.it, marcel.clemens@oapd.inaf.it
M. Clemens
Affiliation:
Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, I-35122 Padova, Italy email: enrico.held@oapd.inaf.it, yazan.almomany@oapd.inaf.it, marco.gullieuszik@oapd.inaf.it, gianpaolo.bertelli@oapd.inaf.it, emma.nasi@oapd.inaf.it, marcel.clemens@oapd.inaf.it
M. R. Rich
Affiliation:
Department of Physics & Astronomy, UCLA, Los Angeles, CA 90095, USA email: rmr@astro.ucla.edu
K. Kuijken
Affiliation:
Leiden Observatory, PO Box 9513, NL-2300 RA Leiden, The Netherlands email: kuijken@strw.leidenuniv.nl
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Abstract

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We present a preliminary reconstruction of the star formation history of the Sagittarius dwarf irregular galaxy (SagDIG), a dIrr galaxy at the border of the Local Group. SagDIG is a lively star-forming dwarf galaxy with very low metallicity and an abundant gas reservoir, for which deep HST ACS observations have been obtained (Momany et al. 2005). We have built synthetic color-magnitude diagrams in the intrinsic ACS bands F606W and F814W and compared them with our HST/ACS observations to derive the global star formation history of the galaxy. We find a broad episode of star formation between 3 and 8 Gyr ago, with a low-intensity tail of star formation at older ages, and a SF enhancement in the last Gyr. An upper limit to the old populations is set by modeling the old HB. Our modeling of the color-magnitude diagram also provides some constraints on the chemical enrichment history of SagDIG.

Keywords

galaxies: dwarfLocal Groupgalaxies: stellar contentgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 339 - 340
Copyright
Copyright © International Astronomical Union 2007

References

Momany, Y., Held, E. V., Saviane, I., et al. 2005, A&A, 439, 111Google Scholar
Rizzi, L., Held, E. V., Bertelli, G., & Saviane, I. 2003, ApJ, 589, L85CrossRefGoogle Scholar
Skillman, E. D., Tolstoy, E., Cole, A. A., Dolphin, A. E., Saha, A., Gallagher, J. S., Dohm-Palmer, R. C., & Mateo, M. 2003, ApJ, 596, 253Google Scholar