DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies
As part of the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey, we present the UV metal absorption features in the circumgalactic medium (CGM) near the H i gas disk (<4.5 R _HI ) of 31 nearby galaxies through quasar absorption-line sp...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adb8ca |
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| author | Brad Koplitz Sanchayeeta Borthakur Timothy Heckman Mansi Padave Tyler McCabe Jason Tumlinson Andrew J. Fox Guinevere Kauffmann |
| author_facet | Brad Koplitz Sanchayeeta Borthakur Timothy Heckman Mansi Padave Tyler McCabe Jason Tumlinson Andrew J. Fox Guinevere Kauffmann |
| author_sort | Brad Koplitz |
| collection | DOAJ |
| description | As part of the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey, we present the UV metal absorption features in the circumgalactic medium (CGM) near the H i gas disk (<4.5 R _HI ) of 31 nearby galaxies through quasar absorption-line spectroscopy. Of the ions under study, Si iii λ 1206 was most frequently detected (18 of 31 sight lines), while C ii λ 1334 and Si ii λ 1260 were detected in 17 and 15 of 31 sight lines, respectively. Many components were consistent with photoionization equilibrium models; most of the cold and cool gas phase clouds were found to have lengths smaller than 2 kpc. Sight lines with smaller impact parameters ( ρ ) normalized by the galaxy’s virial radius ( R _vir ) and H i radius ( R _HI ) tend to have more components and larger rest-frame equivalent widths ( W _r ) than those that probe the CGM at larger radii. In particular, we find that the location of metals are better traced by ρ / R _HI rather than the traditional ρ / R _vir . Larger covering fractions are found closer to galaxies, with a radial decline that depends on the W _r limit used. Our results provide new insights into the spatial distribution of metals around the H i disks of low-redshift galaxies. |
| format | Article |
| id | doaj-art-455d498553d04e07ba417f71aa8ff4d8 |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-455d498553d04e07ba417f71aa8ff4d82025-08-20T02:48:24ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01982217110.3847/1538-4357/adb8caDIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of GalaxiesBrad Koplitz0https://orcid.org/0000-0001-5530-2872Sanchayeeta Borthakur1https://orcid.org/0000-0002-2724-8298Timothy Heckman2https://orcid.org/0000-0001-6670-6370Mansi Padave3https://orcid.org/0000-0002-3472-0490Tyler McCabe4https://orcid.org/0000-0002-5506-3880Jason Tumlinson5https://orcid.org/0000-0002-7982-412XAndrew J. Fox6https://orcid.org/0000-0003-0724-4115Guinevere Kauffmann7School of Earth & Space Exploration, Arizona State University , 781 Terrace Mall, Tempe, AZ 85287, USA ; Brad.Koplitz@asu.eduSchool of Earth & Space Exploration, Arizona State University , 781 Terrace Mall, Tempe, AZ 85287, USA ; Brad.Koplitz@asu.eduSchool of Earth & Space Exploration, Arizona State University , 781 Terrace Mall, Tempe, AZ 85287, USA ; Brad.Koplitz@asu.edu; Department of Physics & Astronomy, Johns Hopkins University , Bloomberg Centre, 3400 N. Charles Street, Baltimore, MD 21218, USASchool of Earth & Space Exploration, Arizona State University , 781 Terrace Mall, Tempe, AZ 85287, USA ; Brad.Koplitz@asu.eduSchool of Earth & Space Exploration, Arizona State University , 781 Terrace Mall, Tempe, AZ 85287, USA ; Brad.Koplitz@asu.eduSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD, USAAURA for ESA, Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Department of Physics & Astronomy, Johns Hopkins University , 3400 N. Charles Street, Baltimore, MD 21218, USAMax-Planck-Institute für Astrophysik , Karl-Schwarzschild-Str 1, D-85740 Garching, GermanyAs part of the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey, we present the UV metal absorption features in the circumgalactic medium (CGM) near the H i gas disk (<4.5 R _HI ) of 31 nearby galaxies through quasar absorption-line spectroscopy. Of the ions under study, Si iii λ 1206 was most frequently detected (18 of 31 sight lines), while C ii λ 1334 and Si ii λ 1260 were detected in 17 and 15 of 31 sight lines, respectively. Many components were consistent with photoionization equilibrium models; most of the cold and cool gas phase clouds were found to have lengths smaller than 2 kpc. Sight lines with smaller impact parameters ( ρ ) normalized by the galaxy’s virial radius ( R _vir ) and H i radius ( R _HI ) tend to have more components and larger rest-frame equivalent widths ( W _r ) than those that probe the CGM at larger radii. In particular, we find that the location of metals are better traced by ρ / R _HI rather than the traditional ρ / R _vir . Larger covering fractions are found closer to galaxies, with a radial decline that depends on the W _r limit used. Our results provide new insights into the spatial distribution of metals around the H i disks of low-redshift galaxies.https://doi.org/10.3847/1538-4357/adb8caPhotoionizationQuasar-galaxy pairsQuasar absorption line spectroscopy |
| spellingShingle | Brad Koplitz Sanchayeeta Borthakur Timothy Heckman Mansi Padave Tyler McCabe Jason Tumlinson Andrew J. Fox Guinevere Kauffmann DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies The Astrophysical Journal Photoionization Quasar-galaxy pairs Quasar absorption line spectroscopy |
| title | DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies |
| title_full | DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies |
| title_fullStr | DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies |
| title_full_unstemmed | DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies |
| title_short | DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies |
| title_sort | diisc vi cos diisc ultraviolet metal absorption relative to the h i disk of galaxies |
| topic | Photoionization Quasar-galaxy pairs Quasar absorption line spectroscopy |
| url | https://doi.org/10.3847/1538-4357/adb8ca |
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