KECK OBSERVATIONS OF THE YOUNG METAL-POOR HOST GALAXY OF THE SUPER-CHANDRASEKHAR-MASS TYPE Ia SUPERNOVA SN 2007if

被引：22

作者：

Childress, M. ^{[1
,2
]}

Aldering, G. ^{[1
]}

Aragon, C. ^{[1
]}

Antilogus, P. ^{[3
]}

Bailey, S. ^{[1
]}

Baltay, C. ^{[4
]}

Bongard, S. ^{[3
]}

Buton, C. ^{[5
]}

Canto, A. ^{[3
]}

Chotard, N. ^{[6
,7
,8
]}

Copin, Y. ^{[6
,7
,8
]}

Fakhouri, H. K. ^{[1
,2
]}

Gangler, E. ^{[6
,7
,8
]}

Kerschhaggl, M. ^{[5
]}

Kowalski, M. ^{[5
]}

Hsiao, E. Y. ^{[1
]}

Loken, S. ^{[1
]}

Nugent, P. ^{[9
]}

Paech, K. ^{[5
]}

Pain, R. ^{[3
]}

Pecontal, E. ^{[10
]}

Pereira, R. ^{[6
,7
,8
]}

Perlmutter, S. ^{[1
,2
]}

Rabinowitz, D. ^{[4
]}

Runge, K. ^{[1
]}

Scalzo, R. ^{[4
,11
]}

Thomas, R. C. ^{[9
]}

Smadja, G. ^{[6
,7
,8
]}

Tao, C. ^{[12
,13
]}

Weaver, B. A. ^{[14
]}

Wu, C. ^{[3
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Univ Paris 07, Univ Paris 06, Lab Phys Nucl & Hautes Energies, CNRS IN2P3, F-75252 Paris 05, France

[4] Yale Univ, Dept Phys, New Haven, CT 06250 USA

[5] Univ Bonn, Inst Phys, D-53115 Bonn, Germany

[6] Univ Lyon, F-69622 Villeurbanne, France

[7] Univ Lyon 1, F-69622 Villeurbanne, France

[8] CNRS, IN2P3, Inst Phys Nucl Lyon, F-75700 Paris, France

[9] Lawrence Berkeley Natl Lab, Computat Res Div, Computat Cosmol Ctr, Berkeley, CA 94611 USA

[10] Univ Lyon 1, Ctr Rech Astron Lyon, F-69561 St Genis Laval, France

[11] Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[12] Ctr Phys Particules Marseille, F-13288 Marseille 09, France

[13] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China

[14] NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 733卷 / 01期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

galaxies: dwarf; supernovae: general; supernovae: individual (SN 2007if); STELLAR POPULATION SYNTHESIS; COMPACT DWARF GALAXIES; DIGITAL SKY SURVEY; TO-LIGHT RATIOS; STAR-FORMATION; METALLICITY RELATION; FACTORY OBSERVATIONS; LUMINOSITY FUNCTION; H-ALPHA; PROGENITORS;

D O I：

10.1088/0004-637X/733/1/3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Keck LRIS spectroscopy and g-band photometry of the metal-poor, low-luminosity host galaxy of the super-Chandrasekhar-mass Type Ia supernova SN 2007if. Deep imaging of the host reveals its apparent magnitude to be m(g) = 23.15 +/- 0.06, which at the spectroscopically measured redshift of z(helio) = 0.07450 +/- 0.00015 corresponds to an absolute magnitude of M-g = -14.45 +/- 0.06. Galaxy g - r color constrains the mass-to-light ratio, giving a host stellar mass estimate of log(M-*/M-circle dot) = 7.32 +/- 0.17. Balmer absorption in the stellar continuum, along with the strength of the 4000 angstrom break, constrains the age of the dominant starburst in the galaxy to be t(burst) = 123(-77)(+165) Myr, corresponding to a main-sequence turnoff mass of M/M-circle dot = 4.6(-1.4)(+2.6). Using the R-23 method of calculating metallicity from the fluxes of strong emission lines, we determine the host oxygen abundance to be 12 + log(O/H)(KK04) = 8.01 +/- 0.09, significantly lower than any previously reported spectroscopically measured Type Ia supernova host galaxy metallicity. Our data show that SN 2007if is very likely to have originated from a young, metal-poor progenitor.

引用

页数：15

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