<p>We studied the dependence of selected structural and kinematic properties of early-type galaxies (ETGs) on their environments. The selected sample, extracted from the SDSS-DR17 MaNGA survey, consists of 946 ETGs in clusters (cETGs) and 288 isolated ETGs (iETGs) within a spectroscopic redshift <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="62" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mi>z</mi> <mo>≤</mo> <mn>0.15</mn> </math></EquationSource> <EquationSource Format="TEX">$z\leq 0.15$</EquationSource> </InlineEquation>. We investigated the distribution of these galaxies in the Fundamental Plane (FP), Kormendy Relation (KR), Faber-Jackson Relation (FJR) and the Mass-Size Relation (MSR). We found that massive galaxies, whose stellar masses <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="103" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>M</mi> <mo>∗</mo> </msub> <mo>&gt;</mo> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mn>11</mn> </mrow> </msup> <msub> <mi>M</mi> <mo>⊙</mo> </msub> </math></EquationSource> <EquationSource Format="TEX">$M_{*}&gt; 10^{11}M_{\odot }$</EquationSource> </InlineEquation>, are predominantly elliptical (<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq3.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="49" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mo>&gt;</mo> <mn>65</mn> <mi mathvariant="normal">%</mi> </math></EquationSource> <EquationSource Format="TEX">$&gt;65\%$</EquationSource> </InlineEquation>). The analysis of the four scaling relations showed that the effect of the host environment is negligible for massive (<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq4.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="112" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>M</mi> <mo>∗</mo> </msub> <mo>&gt;</mo> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mn>11.5</mn> </mrow> </msup> <msub> <mi>M</mi> <mo>⊙</mo> </msub> </math></EquationSource> <EquationSource Format="TEX">$M_{*}&gt;10^{11.5}M_{\odot }$</EquationSource> </InlineEquation>) ETGs, most likely because of their passive evolution through dry mergers and/or stellar aging. On the other hand, low-mass ETGs are influenced by their environment, where iETGs with <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq5.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="103" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>M</mi> <mo>∗</mo> </msub> <mo>&lt;</mo> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mn>10</mn> </mrow> </msup> <msub> <mi>M</mi> <mo>⊙</mo> </msub> </math></EquationSource> <EquationSource Format="TEX">$M_{*}&lt;10^{10}M_{\odot }$</EquationSource> </InlineEquation> and velocity dispersion <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq6.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="64" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>σ</mi> <mn>0</mn> </msub> <mo>≤</mo> <mn>100</mn> </math></EquationSource> <EquationSource Format="TEX">$\sigma _{0}\leq 100$</EquationSource> </InlineEquation> km/sec are <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq7.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="31" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mn>25</mn> <mi mathvariant="normal">%</mi> </math></EquationSource> <EquationSource Format="TEX">$25\%$</EquationSource> </InlineEquation> more luminous and <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4396_Article_IEq8.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mn>11.5</mn> <mi mathvariant="normal">%</mi> </math></EquationSource> <EquationSource Format="TEX">$11.5\%$</EquationSource> </InlineEquation> larger than cETGs. Low-mass cETGs may have suffered processes that removed their gas content and hence quenched star formation while low-mass iETGs may have experienced a recent wet merger that triggered star formation and led to their, currently, observed low mass-to-light ratio. However, further spectral analysis is needed to confirm these findings.</p>

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SDSS-IV MaNGA: the environmental effects on some fundamental properties of early-type galaxies

  • E. Abdellah,
  • R. M. Samir,
  • Z. Awad,
  • M. Y. Amin

摘要

We studied the dependence of selected structural and kinematic properties of early-type galaxies (ETGs) on their environments. The selected sample, extracted from the SDSS-DR17 MaNGA survey, consists of 946 ETGs in clusters (cETGs) and 288 isolated ETGs (iETGs) within a spectroscopic redshift z 0.15 $z\leq 0.15$ . We investigated the distribution of these galaxies in the Fundamental Plane (FP), Kormendy Relation (KR), Faber-Jackson Relation (FJR) and the Mass-Size Relation (MSR). We found that massive galaxies, whose stellar masses M > 10 11 M $M_{*}> 10^{11}M_{\odot }$ , are predominantly elliptical ( > 65 % $>65\%$ ). The analysis of the four scaling relations showed that the effect of the host environment is negligible for massive ( M > 10 11.5 M $M_{*}>10^{11.5}M_{\odot }$ ) ETGs, most likely because of their passive evolution through dry mergers and/or stellar aging. On the other hand, low-mass ETGs are influenced by their environment, where iETGs with M < 10 10 M $M_{*}<10^{10}M_{\odot }$ and velocity dispersion σ 0 100 $\sigma _{0}\leq 100$ km/sec are 25 % $25\%$ more luminous and 11.5 % $11.5\%$ larger than cETGs. Low-mass cETGs may have suffered processes that removed their gas content and hence quenched star formation while low-mass iETGs may have experienced a recent wet merger that triggered star formation and led to their, currently, observed low mass-to-light ratio. However, further spectral analysis is needed to confirm these findings.