Close Major-merger Pairs at z = 0: Bulge-to-total Ratio and Star Formation Enhancement
We present a study of the bulge-to-total ratio (B/T) of a K s-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on two-dimensional decompositions of SDSS r -band images with galfit . We investigate the dependence of the interaction-induced specific star formation rate...
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| Published in | The Astrophysical journal. Supplement series Vol. 261; no. 2; pp. 34 - 47 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
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The American Astronomical Society
01.08.2022
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| Abstract | We present a study of the bulge-to-total ratio (B/T) of a
K
s-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on two-dimensional decompositions of SDSS
r
-band images with
galfit
. We investigate the dependence of the interaction-induced specific star formation rate enhancement (sSFR
enh
) on the B/T ratio, and the effects of this dependence on the differences between star-forming galaxies (SFGs) in spiral+spiral (S+S) and spiral+elliptical (S+E) pairs. Of all the 132 spiral galaxies in H-KPAIR, the 44 in S+E pairs show higher B/T than those in the 44 S+S pairs, with means of B/T = 0.35 ± 0.05 and B/T = 0.26 ± 0.03, respectively. There is a strong negative dependence of sSFR
enh
on the B/T ratio, and only paired SFGs with B/T < 0.3 show significant (>5
σ
) enhancement. Paired SFGs in S+S pairs show a similar trend, and many disky SFGs (B/T < 0.1) in S+S pairs have strong sSFR enhancements (sSFR
enh
> 0.7 dex). For SFGs in S+E pairs, the sSFR has no clear B/T dependence, nor any significant enhancement in any B/T bin. Disky SFGs in S+S pairs show significant (>4
σ
) enhancement in molecular gas content (
M
H
2
/
M
star
), while SFGs in S+E pairs have no such enhancement in any B/T bin. No significant enhancement of the total gas content (
M
gas
/
M
star
) is found in any B/T bin for paired galaxies. The star formation efficiency of either the total gas (SFE
gas
= SFR/
M
gas
) or molecular gas (
SFE
H
2
=
SFR
/
M
H
2
) does not depend on the B/T ratio. The only significant (> 4
σ
) SFE enhancement found for paired SFGs is the SFE
gas
for disky SFGs in S+S pairs. |
|---|---|
| AbstractList | We present a study of the bulge-to-total ratio (B/T) of a Ks-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on two-dimensional decompositions of SDSS r-band images with galfit. We investigate the dependence of the interaction-induced specific star formation rate enhancement (sSFRenh) on the B/T ratio, and the effects of this dependence on the differences between star-forming galaxies (SFGs) in spiral+spiral (S+S) and spiral+elliptical (S+E) pairs. Of all the 132 spiral galaxies in H-KPAIR, the 44 in S+E pairs show higher B/T than those in the 44 S+S pairs, with means of B/T = 0.35 ± 0.05 and B/T = 0.26 ± 0.03, respectively. There is a strong negative dependence of sSFRenh on the B/T ratio, and only paired SFGs with B/T < 0.3 show significant (>5σ) enhancement. Paired SFGs in S+S pairs show a similar trend, and many disky SFGs (B/T < 0.1) in S+S pairs have strong sSFR enhancements (sSFRenh > 0.7 dex). For SFGs in S+E pairs, the sSFR has no clear B/T dependence, nor any significant enhancement in any B/T bin. Disky SFGs in S+S pairs show significant (>4σ) enhancement in molecular gas content (MH2/Mstar), while SFGs in S+E pairs have no such enhancement in any B/T bin. No significant enhancement of the total gas content (Mgas/Mstar) is found in any B/T bin for paired galaxies. The star formation efficiency of either the total gas (SFEgas = SFR/Mgas) or molecular gas (SFEH2=SFR/MH2) does not depend on the B/T ratio. The only significant (> 4σ) SFE enhancement found for paired SFGs is the SFEgas for disky SFGs in S+S pairs. We present a study of the bulge-to-total ratio (B/T) of a K s-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on two-dimensional decompositions of SDSS r -band images with galfit . We investigate the dependence of the interaction-induced specific star formation rate enhancement (sSFR enh ) on the B/T ratio, and the effects of this dependence on the differences between star-forming galaxies (SFGs) in spiral+spiral (S+S) and spiral+elliptical (S+E) pairs. Of all the 132 spiral galaxies in H-KPAIR, the 44 in S+E pairs show higher B/T than those in the 44 S+S pairs, with means of B/T = 0.35 ± 0.05 and B/T = 0.26 ± 0.03, respectively. There is a strong negative dependence of sSFR enh on the B/T ratio, and only paired SFGs with B/T < 0.3 show significant (>5 σ ) enhancement. Paired SFGs in S+S pairs show a similar trend, and many disky SFGs (B/T < 0.1) in S+S pairs have strong sSFR enhancements (sSFR enh > 0.7 dex). For SFGs in S+E pairs, the sSFR has no clear B/T dependence, nor any significant enhancement in any B/T bin. Disky SFGs in S+S pairs show significant (>4 σ ) enhancement in molecular gas content ( M H 2 / M star ), while SFGs in S+E pairs have no such enhancement in any B/T bin. No significant enhancement of the total gas content ( M gas / M star ) is found in any B/T bin for paired galaxies. The star formation efficiency of either the total gas (SFE gas = SFR/ M gas ) or molecular gas ( SFE H 2 = SFR / M H 2 ) does not depend on the B/T ratio. The only significant (> 4 σ ) SFE enhancement found for paired SFGs is the SFE gas for disky SFGs in S+S pairs. We present a study of the bulge-to-total ratio (B/T) of a Ks-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on two-dimensional decompositions of SDSS r-band images with galfit. We investigate the dependence of the interaction-induced specific star formation rate enhancement (sSFRenh) on the B/T ratio, and the effects of this dependence on the differences between star-forming galaxies (SFGs) in spiral+spiral (S+S) and spiral+elliptical (S+E) pairs. Of all the 132 spiral galaxies in H-KPAIR, the 44 in S+E pairs show higher B/T than those in the 44 S+S pairs, with means of B/T = 0.35 ± 0.05 and B/T = 0.26 ± 0.03, respectively. Furthermore, there is a strong negative dependence of sSFRenh on the B/T ratio, and only paired SFGs with B/T < 0.3 show significant (>5σ) enhancement. Paired SFGs in S+S pairs show a similar trend, and many disky SFGs (B/T < 0.1) in S+S pairs have strong sSFR enhancements (sSFRenh > 0.7 dex). For SFGs in S+E pairs, the sSFR has no clear B/T dependence, nor any significant enhancement in any B/T bin. Disky SFGs in S+S pairs show significant (>4σ) enhancement in molecular gas content (${M}_{{{\rm{H}}}_{2}}/{M}_{\mathrm{star}}$), while SFGs in S+E pairs have no such enhancement in any B/T bin. No significant enhancement of the total gas content (Mgas/Mstar) is found in any B/T bin for paired galaxies. The star formation efficiency of either the total gas (SFEgas = SFR/Mgas) or molecular gas (${\mathrm{SFE}}_{{{\rm{H}}}_{2}}=\mathrm{SFR}/{M}_{{{\rm{H}}}_{2}}$) does not depend on the B/T ratio. The only significant (> 4σ) SFE enhancement found for paired SFGs is the SFEgas for disky SFGs in S+S pairs. |
| Author | He, Chuan Huang, Jia-sheng Cao, Chen Xu, Cong Kevin Domingue, Donovan |
| Author_xml | – sequence: 1 givenname: Chuan orcidid: 0000-0003-1761-5442 surname: He fullname: He, Chuan organization: University of Chinese Academy of Sciences School of Astronomy and Space Sciences, Beijing 100049, People's Republic of China – sequence: 2 givenname: Cong Kevin orcidid: 0000-0002-1588-6700 surname: Xu fullname: Xu, Cong Kevin organization: National Astronomical Observatories of China Chinese Academy of Sciences South America Center for Astronomy, Chinese Academy of Sciences, Beijing 100101, People's Republic of China – sequence: 3 givenname: Donovan orcidid: 0000-0001-5662-7169 surname: Domingue fullname: Domingue, Donovan organization: Georgia College & State University , CBX 82, Milledgeville, GA 31061, USA – sequence: 4 givenname: Chen surname: Cao fullname: Cao, Chen organization: Shandong University Shandong Key Laboratory of Optical Astronomy & Solar-Terrestrial Environment, Institute of Space Sciences, Weihai, Shandong 264209, People's Republic of China – sequence: 5 givenname: Jia-sheng orcidid: 0000-0001-6511-8745 surname: Huang fullname: Huang, Jia-sheng organization: National Astronomical Observatories of China Chinese Academy of Sciences South America Center for Astronomy, Chinese Academy of Sciences, Beijing 100101, People's Republic of China |
| BackLink | https://www.osti.gov/servlets/purl/1983314$$D View this record in Osti.gov |
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| Snippet | We present a study of the bulge-to-total ratio (B/T) of a
K
s-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on... We present a study of the bulge-to-total ratio (B/T) of a Ks-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on... |
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| SubjectTerms | Astronomy & Astrophysics ASTRONOMY AND ASTROPHYSICS Galaxies Galaxy evolution Galaxy interactions Galaxy structure Molecular gases Spiral galaxies Star & galaxy formation Star formation Star formation rate Stars |
| Title | Close Major-merger Pairs at z = 0: Bulge-to-total Ratio and Star Formation Enhancement |
| URI | https://iopscience.iop.org/article/10.3847/1538-4365/ac73ec https://www.proquest.com/docview/2696502307 https://www.osti.gov/servlets/purl/1983314 |
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