Multiple-line study of molecular gas in spiral galaxy NGC 2903

Selçuk TOPAL

Makale detayları

Multiple-line study of molecular gas in spiral galaxy NGC 2903

Yazarlar:

Selçuk TOPAL

Yayıncı:

TUBITAK

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Turkish Journal of Physics 2018 Vol.42 Issue 6, pp.706-720

Belge Tipi:

Makale

Yayın Tarihi:

12/2018

Belge Dili:

İngilizce

Document ID (Org No.):

2000759167

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Özet:

 


                        Multiple molecular lines with radiative transfer modeling are a powerful tool to probe the physics of starforming
gas in galaxies. We investigate the gas properties in the center of spiral galaxy NGC 2903 using low-J CO lines,
i.e. 12CO(1-0), 12CO(2-1), 12CO(3-2), 13CO(1-0), and HCN(1-0). We apply a nonlocal thermodynamic equilibrium
radiative transfer code to derive beam-averaged molecular gas properties. We use two methods (i.e. X2 minimization
and likelihood) to define the best model representing the observed line ratios best. The line ratio diagnostics suggest that
CO gas in the center of NGC 2903 is thinner and the dense gas fraction is similar compared to that of spirals, starbursts,
and early-type galaxies (ETGs), while the gas in the center of the galaxy is warmer than that of ETGs and colder than
that of starbursts. Based on the best-fitting model results, we find that the beam-averaged gas kinetic temperature is
TK = 20 K, H2 volume number density is log(n(H2)) = 4.2 cm-3 , and CO column number density is log(N(CO)) =
19.0 cm-2 in the center of NGC 2903. Both methods, i.e. the line ratio diagnostics and modeling, indicate an ISM in
the center of NGC 2903 having intermediate temperature and star formation activity (also supported by star formation
rates), thinner CO gas with similar dense gas fraction, and higher H2 volume number density compared to that of spirals,
ETGs, and starbursts.

                    

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Makale detayları

Multiple-line study of molecular gas in spiral galaxy NGC 2903

Yazarlar: Selçuk TOPAL

Yayıncı: TUBITAK

Ana Başlıklar: Uygulamalı fizik

Dergi: Turkish Journal of Physics 2018 Vol.42 Issue 6, pp.706-720

Belge Tipi: Makale

Yayın Tarihi: 12/2018

Belge Dili: İngilizce

Document ID (Org No.): 2000759167

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Sayı

Yazarlar:

Selçuk TOPAL

Yayıncı:

TUBITAK

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Turkish Journal of Physics 2018 Vol.42 Issue 6, pp.706-720

Belge Tipi:

Makale

Yayın Tarihi:

12/2018

Belge Dili:

İngilizce

Document ID (Org No.):

2000759167

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101