A Spectroscopic Search for Dormant Black Holes in Low-Metallicity Binaries
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2025
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| author | Nagarajan, Pranav El-Badry, Kareem Reggiani, Henrique Lam, Casey Y. Simon, Joshua D. Müller-Horn, Johanna Seeburger, Rhys Rix, Hans-Walter Isaacson, Howard Lu, Jessica Chandra, Vedant Andrae, Rene |
| author_facet | Nagarajan, Pranav El-Badry, Kareem Reggiani, Henrique Lam, Casey Y. Simon, Joshua D. Müller-Horn, Johanna Seeburger, Rhys Rix, Hans-Walter Isaacson, Howard Lu, Jessica Chandra, Vedant Andrae, Rene |
| contents | The discovery of the massive black hole (BH) system Gaia BH3 in pre-release Gaia DR4 data suggests that wide BH binaries with luminous companions may be significantly overrepresented at low metallicities. Motivated by this finding, we have initiated a spectroscopic survey of low-metallicity stars exhibiting elevated RUWE values in Gaia DR3, using the FEROS and APF spectrographs. We identify promising BH binary candidates as objects with instantaneously measured radial velocities (RVs) that are very different from their mean RVs reported in Gaia DR3. Thus far, we have observed over 500 targets, including a nearly complete sample of stars with $\text{[Fe/H]} < -1.5$, RUWE $> 2$, and $G < 15$. Our search has yielded one promising target exhibiting slow acceleration and an RV more than 98 km s$^{-1}$ different from its DR3 mean RV, as well as dozens of other candidates with smaller RV discrepancies. We quantify the sensitivity of our search using simulations, demonstrating that it recovers at least half of the BH companions within our selection criteria. We make all the spectra and RVs from our survey publicly available and encourage further follow-up. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_12532 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Spectroscopic Search for Dormant Black Holes in Low-Metallicity Binaries Nagarajan, Pranav El-Badry, Kareem Reggiani, Henrique Lam, Casey Y. Simon, Joshua D. Müller-Horn, Johanna Seeburger, Rhys Rix, Hans-Walter Isaacson, Howard Lu, Jessica Chandra, Vedant Andrae, Rene Solar and Stellar Astrophysics Astrophysics of Galaxies The discovery of the massive black hole (BH) system Gaia BH3 in pre-release Gaia DR4 data suggests that wide BH binaries with luminous companions may be significantly overrepresented at low metallicities. Motivated by this finding, we have initiated a spectroscopic survey of low-metallicity stars exhibiting elevated RUWE values in Gaia DR3, using the FEROS and APF spectrographs. We identify promising BH binary candidates as objects with instantaneously measured radial velocities (RVs) that are very different from their mean RVs reported in Gaia DR3. Thus far, we have observed over 500 targets, including a nearly complete sample of stars with $\text{[Fe/H]} < -1.5$, RUWE $> 2$, and $G < 15$. Our search has yielded one promising target exhibiting slow acceleration and an RV more than 98 km s$^{-1}$ different from its DR3 mean RV, as well as dozens of other candidates with smaller RV discrepancies. We quantify the sensitivity of our search using simulations, demonstrating that it recovers at least half of the BH companions within our selection criteria. We make all the spectra and RVs from our survey publicly available and encourage further follow-up. |
| title | A Spectroscopic Search for Dormant Black Holes in Low-Metallicity Binaries |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2507.12532 |