In-Situ Spheroid Formation in Distant Submillimeter-Bright Galaxies
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866913541490999296 |
|---|---|
| author | Tan, Qing-Hua Daddi, Emanuele Magnelli, Benjamin Correa, Camila A. Bournaud, Frédéric Adscheid, Sylvia Zhang, Shao-Bo Elbaz, David Gómez-Guijarro, Carlos Kalita, Boris S. Liu, Daizhong Liu, Zhaoxuan Pety, Jérôme Puglisi, Annagrazia Schinnerer, Eva Silverman, John D. Valentino, Francesco |
| author_facet | Tan, Qing-Hua Daddi, Emanuele Magnelli, Benjamin Correa, Camila A. Bournaud, Frédéric Adscheid, Sylvia Zhang, Shao-Bo Elbaz, David Gómez-Guijarro, Carlos Kalita, Boris S. Liu, Daizhong Liu, Zhaoxuan Pety, Jérôme Puglisi, Annagrazia Schinnerer, Eva Silverman, John D. Valentino, Francesco |
| contents | The majority of stars in today's Universe reside within spheroids, which are bulges of spiral galaxies and elliptical galaxies. Their formation is still an unsolved problem. Infrared/submm-bright galaxies at high redshifts have long been suspected to be related to spheroids formation. Proving this connection has been hampered so far by heavy dust obscuration when focusing on their stellar emission or by methodologies and limited signal-to-noise ratios when looking at submm wavelengths. Here we show that spheroids are directly generated by star formation within the cores of highly luminous starburst galaxies in the distant Universe. This follows from the ALMA submillimeter surface brightness profiles which deviate significantly from those of exponential disks, and from the skewed-high axis-ratio distribution. The majority of these galaxies are fully triaxial rather than flat disks: the ratio of the shortest to the longest of their three axes is half, on average, and increases with spatial compactness. These observations, supported by simulations, reveal a cosmologically relevant pathway for in-situ spheroid formation through starbursts likely preferentially triggered by interactions (and mergers) acting on galaxies fed by non-co-planar gas accretion streams. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_16578 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | In-Situ Spheroid Formation in Distant Submillimeter-Bright Galaxies Tan, Qing-Hua Daddi, Emanuele Magnelli, Benjamin Correa, Camila A. Bournaud, Frédéric Adscheid, Sylvia Zhang, Shao-Bo Elbaz, David Gómez-Guijarro, Carlos Kalita, Boris S. Liu, Daizhong Liu, Zhaoxuan Pety, Jérôme Puglisi, Annagrazia Schinnerer, Eva Silverman, John D. Valentino, Francesco Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics The majority of stars in today's Universe reside within spheroids, which are bulges of spiral galaxies and elliptical galaxies. Their formation is still an unsolved problem. Infrared/submm-bright galaxies at high redshifts have long been suspected to be related to spheroids formation. Proving this connection has been hampered so far by heavy dust obscuration when focusing on their stellar emission or by methodologies and limited signal-to-noise ratios when looking at submm wavelengths. Here we show that spheroids are directly generated by star formation within the cores of highly luminous starburst galaxies in the distant Universe. This follows from the ALMA submillimeter surface brightness profiles which deviate significantly from those of exponential disks, and from the skewed-high axis-ratio distribution. The majority of these galaxies are fully triaxial rather than flat disks: the ratio of the shortest to the longest of their three axes is half, on average, and increases with spatial compactness. These observations, supported by simulations, reveal a cosmologically relevant pathway for in-situ spheroid formation through starbursts likely preferentially triggered by interactions (and mergers) acting on galaxies fed by non-co-planar gas accretion streams. |
| title | In-Situ Spheroid Formation in Distant Submillimeter-Bright Galaxies |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2407.16578 |