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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2503.11139 |
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| author | Ng, Yu Voon Lan, Ting-Wen Prochaska, J. Xavier Saintonge, Amélie Chang, Yu-Ling Siudek, Małgorzata Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Arjun Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Ishak, Mustapha Juneau, Stephanie Kisner, Theodore Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Myers, Adam Nadathur, Seshadri Poppett, Claire Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Harry Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| author_facet | Ng, Yu Voon Lan, Ting-Wen Prochaska, J. Xavier Saintonge, Amélie Chang, Yu-Ling Siudek, Małgorzata Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Arjun Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Ishak, Mustapha Juneau, Stephanie Kisner, Theodore Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Myers, Adam Nadathur, Seshadri Poppett, Claire Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Harry Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| contents | We investigate the relationships between the cool circumgalactic medium (CGM), traced by Ca II absorption lines, and galaxy properties at $z<0.4$ using $\sim900{,}000$ galaxy-quasar pairs within $200\,\rm kpc$ from the Year 1 data of the Dark Energy Spectroscopic Instrument (DESI). This large data set enables us to obtain composite spectra with sensitivity reaching to the $\text{mÅ}$ level and to explore the Ca II absorption as a function of stellar mass, star formation rate (SFR), redshift, and galaxy types, including active galactic nuclei (AGNs). Our results show a positive correlation between the absorption strength and stellar mass of star-forming galaxies with $\langle W_{0}^{\rm Ca\ II}\rangle \propto M_{*}^{0.5}$ over 3 orders of magnitude in stellar mass from $\sim 10^{8}$ to $10^{11} \, M_{\odot}$, while such a mass dependence is weaker for quiescent galaxies. At a fixed mass, Ca II absorption is stronger around star-forming galaxies than quiescent ones especially within impact parameters $<30\,\rm kpc$. Among star-forming galaxies, the Ca II absorption further correlates with SFR, following $\propto \mathrm{SFR^{0.3}}$. However, in contrast to the results at higher redshifts, stronger absorption is not preferentially observed along the minor axis of star-forming galaxies, indicating a possible redshift evolution of CGM dynamics resulting from galactic feedback. Moreover, no significant difference between the properties of the cool gas around AGNs and galaxies is detected. Finally, we measure the absorption profiles with respect to the virial radius of dark matter halos and show that the total Ca II mass in the CGM is comparable to the Ca mass in the ISM of galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11139 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Comprehensive Characterization of Galaxy-cool CGM Connections at $z<0.4$ with DESI Year 1 Data Ng, Yu Voon Lan, Ting-Wen Prochaska, J. Xavier Saintonge, Amélie Chang, Yu-Ling Siudek, Małgorzata Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Arjun Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Ishak, Mustapha Juneau, Stephanie Kisner, Theodore Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Myers, Adam Nadathur, Seshadri Poppett, Claire Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Harry Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu Astrophysics of Galaxies We investigate the relationships between the cool circumgalactic medium (CGM), traced by Ca II absorption lines, and galaxy properties at $z<0.4$ using $\sim900{,}000$ galaxy-quasar pairs within $200\,\rm kpc$ from the Year 1 data of the Dark Energy Spectroscopic Instrument (DESI). This large data set enables us to obtain composite spectra with sensitivity reaching to the $\text{mÅ}$ level and to explore the Ca II absorption as a function of stellar mass, star formation rate (SFR), redshift, and galaxy types, including active galactic nuclei (AGNs). Our results show a positive correlation between the absorption strength and stellar mass of star-forming galaxies with $\langle W_{0}^{\rm Ca\ II}\rangle \propto M_{*}^{0.5}$ over 3 orders of magnitude in stellar mass from $\sim 10^{8}$ to $10^{11} \, M_{\odot}$, while such a mass dependence is weaker for quiescent galaxies. At a fixed mass, Ca II absorption is stronger around star-forming galaxies than quiescent ones especially within impact parameters $<30\,\rm kpc$. Among star-forming galaxies, the Ca II absorption further correlates with SFR, following $\propto \mathrm{SFR^{0.3}}$. However, in contrast to the results at higher redshifts, stronger absorption is not preferentially observed along the minor axis of star-forming galaxies, indicating a possible redshift evolution of CGM dynamics resulting from galactic feedback. Moreover, no significant difference between the properties of the cool gas around AGNs and galaxies is detected. Finally, we measure the absorption profiles with respect to the virial radius of dark matter halos and show that the total Ca II mass in the CGM is comparable to the Ca mass in the ISM of galaxies. |
| title | A Comprehensive Characterization of Galaxy-cool CGM Connections at $z<0.4$ with DESI Year 1 Data |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.11139 |