The Composite Spectrum of QSO Absorption Line Systems in DESI DR2
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866911298139193344 |
|---|---|
| author | Napolitano, Lucas Myers, Adam D. Tedeschi, Adam Anand, Abhijeet Herrera-Alcantar, Hiram K. Aguilar, Jessica Ahlen, Steven Bailey, Stephen BenZvi, Segev Bianchi, Davide Brooks, David Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Joyce, Dick Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nadathur, Seshadri Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Perez-Rafols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joesph Harry Sprayberry, David Tarle, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| author_facet | Napolitano, Lucas Myers, Adam D. Tedeschi, Adam Anand, Abhijeet Herrera-Alcantar, Hiram K. Aguilar, Jessica Ahlen, Steven Bailey, Stephen BenZvi, Segev Bianchi, Davide Brooks, David Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Joyce, Dick Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nadathur, Seshadri Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Perez-Rafols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joesph Harry Sprayberry, David Tarle, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| contents | We present details regarding the construction of a composite spectrum of quasar (QSO) absorption line systems. In this composite spectrum we identify more than 70 absorption lines, and observe oxygen and hydrogen emission features at a higher signal-to-noise ratio than in any previous study. As the light from a distant quasar travels towards an observer, it may interact with the circumgalactic medium environment of an intervening galaxy, forming absorption lines. In order to maximize the signal of these absorption lines, we have selected a sample of 238,838 quasar spectra from the second data release of the Dark Energy Spectroscopic Instrument (DESI), each identified to have absorption lines resulting from such an interaction. By stacking these spectra in the restframe of the absorption, and calculating a median composite spectrum, we are able to isolate and enhance these absorption lines. We provide a full atlas of all detected absorption and emission lines as well as their fit centroids and equivalent width values. This atlas should aid in future studies investigating the compositions and physical conditions of these absorbers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_02992 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Composite Spectrum of QSO Absorption Line Systems in DESI DR2 Napolitano, Lucas Myers, Adam D. Tedeschi, Adam Anand, Abhijeet Herrera-Alcantar, Hiram K. Aguilar, Jessica Ahlen, Steven Bailey, Stephen BenZvi, Segev Bianchi, Davide Brooks, David Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Joyce, Dick Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nadathur, Seshadri Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Perez-Rafols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joesph Harry Sprayberry, David Tarle, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu Astrophysics of Galaxies We present details regarding the construction of a composite spectrum of quasar (QSO) absorption line systems. In this composite spectrum we identify more than 70 absorption lines, and observe oxygen and hydrogen emission features at a higher signal-to-noise ratio than in any previous study. As the light from a distant quasar travels towards an observer, it may interact with the circumgalactic medium environment of an intervening galaxy, forming absorption lines. In order to maximize the signal of these absorption lines, we have selected a sample of 238,838 quasar spectra from the second data release of the Dark Energy Spectroscopic Instrument (DESI), each identified to have absorption lines resulting from such an interaction. By stacking these spectra in the restframe of the absorption, and calculating a median composite spectrum, we are able to isolate and enhance these absorption lines. We provide a full atlas of all detected absorption and emission lines as well as their fit centroids and equivalent width values. This atlas should aid in future studies investigating the compositions and physical conditions of these absorbers. |
| title | The Composite Spectrum of QSO Absorption Line Systems in DESI DR2 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.02992 |