Ultraviolet Properties of Multi-phase Gas Toward the Inner Galaxy
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arXiv
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| Format: | Preprint |
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2025
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| author | Cashman, Frances H. Fox, Andrew J. Som, Debopam Wakker, Bart P. Benjamin, Robert A. Krishnarao, Dhanesh French, David M. Bordoloi, Rongmon Lockman, Felix J. |
| author_facet | Cashman, Frances H. Fox, Andrew J. Som, Debopam Wakker, Bart P. Benjamin, Robert A. Krishnarao, Dhanesh French, David M. Bordoloi, Rongmon Lockman, Felix J. |
| contents | We present a systematic study of the multi-phase interstellar gas in the Inner Galaxy using HST/STIS absorption spectroscopy of 16 massive stars located at spectroscopic distances between 1.3 and 10 kpc in the region $-30^\circ\lesssim l \lesssim+30^\circ$ and $-15^\circ\lesssim b \lesssim+15^\circ$. These sight lines probe gas above and below the Sagittarius Carina, Scutum Crux-Centaurus, Norma, and Near 3 kpc spiral arms in a range of $z$-height from 0 to 1.5 kpc. Along the 16 sight lines, we measure velocity centroids for 800 UV absorption-line components across multiple gas phases (molecular CO, neutral, low ion, and high ion). We find that 619/800 components have velocities that are consistent with a simple model of co-rotation with the disk, indicating that multi-phase gas with disk-like kinematics extends at least 1 kpc into the halo. We present a database of absorption-line parameters that can be used for kinematic modeling of gas flows into and out of the Galactic disk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_07969 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultraviolet Properties of Multi-phase Gas Toward the Inner Galaxy Cashman, Frances H. Fox, Andrew J. Som, Debopam Wakker, Bart P. Benjamin, Robert A. Krishnarao, Dhanesh French, David M. Bordoloi, Rongmon Lockman, Felix J. Astrophysics of Galaxies We present a systematic study of the multi-phase interstellar gas in the Inner Galaxy using HST/STIS absorption spectroscopy of 16 massive stars located at spectroscopic distances between 1.3 and 10 kpc in the region $-30^\circ\lesssim l \lesssim+30^\circ$ and $-15^\circ\lesssim b \lesssim+15^\circ$. These sight lines probe gas above and below the Sagittarius Carina, Scutum Crux-Centaurus, Norma, and Near 3 kpc spiral arms in a range of $z$-height from 0 to 1.5 kpc. Along the 16 sight lines, we measure velocity centroids for 800 UV absorption-line components across multiple gas phases (molecular CO, neutral, low ion, and high ion). We find that 619/800 components have velocities that are consistent with a simple model of co-rotation with the disk, indicating that multi-phase gas with disk-like kinematics extends at least 1 kpc into the halo. We present a database of absorption-line parameters that can be used for kinematic modeling of gas flows into and out of the Galactic disk. |
| title | Ultraviolet Properties of Multi-phase Gas Toward the Inner Galaxy |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2505.07969 |