Was the Milky Way a chain galaxy? Using the IGIMF theory to constrain the thin-disc star formation history and mass
Was the Milky Way a chain galaxy? Using the IGIMF theory to constrain the thin-disc star formation history and mass
复制标题
银河系是一个链状星系吗?
DOI:
10.1093/mnras/sty2812
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发表时间:
2018
影响因子:
4.8
通讯作者:
P. Kroupa
中科院分区:
文献类型:
--
作者:
A. H. Zonoozi;Hamidreza Mahani;P. Kroupa
The observed present-day stellar mass function (PDMF) of the solar neighborhood is a mixture of stellar populations born in star-forming events that occurred over the life-time of the thin disk of the Galaxy. Assuming stars form in embedded clusters which have stellar initial mass functions (IMFs) which depend on the metallicity and density of the star-forming gas clumps, the integrated galaxy-wide IMF (IGIMF) can be calculated. The shape of the IGIMF thus depends on the SFR and metallicity. Here, the shape of the PDMF for stars more massive than $1\,M_\odot$ in combination with the mass density in low-mass stars is used to constrain the current star-formation rate (SFR), the star formation history (SFH) and the current stellar plus remnant mass ($M_*$) in the Galactic thin disk. This yields the current SFR, $\dot{M}_*= 4.1^{+3.1}_{-2.8}~M_\odot$yr$^{-1}$, a declining SFH and $M_*=2.1^{+3.0}_{-1.5}\times 10^{11}M_\odot$, respectively, with a V-band stellar mass-to-light ratio of $M_*/L_V=2.79^{+0.48}_{-0.38}$.These values are consistent with independent measurements. We also quantify the surface density of black holes and neutron stars in the Galactic thin disk. The invariant canonical IMF can reproduce the PDMF of the Galaxy as well as the IGIMF, but in the universal IMF framework it is not possible to constrain any of the above Galactic properties. Assuming the IGMF theory is the correct framework and in combination with the vertical velocity dispersion data of stars, it follows that the Milky Way would have appeared as a chain galaxy at high redshift.
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DOI:
10.1111/j.1365-2966.2012.20767.x
发表时间:
2012-02
影响因子:
4.8
作者:
M. Marks;P. Kroupa;J. Dabringhausen;M. Pawlowski
通讯作者:
M. Marks;P. Kroupa;J. Dabringhausen;M. Pawlowski
DOI:
10.1088/0004-637x/746/1/15
发表时间:
2011-11
期刊:
The Astrophysical Journal
影响因子:
--
作者:
S. Banerjee;P. Kroupa;Seungkyung Oh
通讯作者:
S. Banerjee;P. Kroupa;Seungkyung Oh
影响因子:
6.5
作者:
Nina Brinkmann;S. Banerjee;Bhawna Motwani;P. Kroupa
通讯作者:
Nina Brinkmann;S. Banerjee;Bhawna Motwani;P. Kroupa
DOI:
10.1088/0004-637x/747/1/72
发表时间:
2011-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
J. Dabringhausen;P. Kroupa;J. Pflamm-Altenburg;S. Mieske
通讯作者:
J. Dabringhausen;P. Kroupa;J. Pflamm-Altenburg;S. Mieske
影响因子:
56.9
作者:
F. Schneider;H. Sana;C. Evans;J. Bestenlehner;J. Bestenlehner;N. Castro;L. Fossati;G. Gräfener;N. Langer;O. Ramírez-Agudelo;C. Sabín-Sanjulián;S. Simón-Díaz;S. Simón-Díaz;F. Tramper;P. Crowther;A. D. Koter;A. D. Koter;S. D. Mink;P. Dufton;María García;M. Gieles;V. Hénault-Brunet;V. Hénault-Brunet;A. Herrero;A. Herrero;R. Izzard;V. Kalari;D. Lennon;J. M. Apellániz;N. Markova;F. Najarro;P. Podsiadlowski;P. Podsiadlowski;J. Puls;W. Taylor;J. V. Loon;J. Vink;C. Norman;C. Norman
通讯作者:
F. Schneider;H. Sana;C. Evans;J. Bestenlehner;J. Bestenlehner;N. Castro;L. Fossati;G. Gräfener;N. Langer;O. Ramírez-Agudelo;C. Sabín-Sanjulián;S. Simón-Díaz;S. Simón-Díaz;F. Tramper;P. Crowther;A. D. Koter;A. D. Koter;S. D. Mink;P. Dufton;María García;M. Gieles;V. Hénault-Brunet;V. Hénault-Brunet;A. Herrero;A. Herrero;R. Izzard;V. Kalari;D. Lennon;J. M. Apellániz;N. Markova;F. Najarro;P. Podsiadlowski;P. Podsiadlowski;J. Puls;W. Taylor;J. V. Loon;J. Vink;C. Norman;C. Norman