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PreprintarXiv licencearXiv

A new method to cleanly separate hot and cool populations using just Gaia and 2MASS photometry

  • J. Maíz Apellániz
  • M. Pantaleoni González
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Abstract

We have developed a photometric method that produces clean hot (intrinsically blue) populations using Gaia and 2MASS photometry alone with [a] a very small (false positives < 1%) contamination from cool (intrinsically red) luminous sources, [b] independent of extinction (limited only by S/N), and [c] with only small losses (false negatives < 10%) of real OB stars. Applying the method to Gaia DR3 data we are able to recover extinguished OB stars down to E(G_BP-G_RP) = 5, producing a catalog of ~2x10^5 candidate OB stars that reaches beyond the Scutum-Centaurus arm. This method can potentially extend the sample of known OB stars by an order of magnitude, which would yield a large leap in our knowledge of the populations of compact-object progenitors, including gravitational-wave sources.

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Cite

BibTeXRIS
BibTeX
@misc{apellaniz2026method,
  title = {{A new method to cleanly separate hot and cool populations using just Gaia and 2MASS photometry}},
  author = {J. Maíz Apellániz and M. Pantaleoni González},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.15264},
  eprint = {2609.15264},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.15264},
}
RIS
TY  - UNPB
TI  - A new method to cleanly separate hot and cool populations using just Gaia and 2MASS photometry
AU  - J. Maíz Apellániz
AU  - M. Pantaleoni González
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.15264
UR  - https://arxiv.org/abs/2609.15264
AB  - We have developed a photometric method that produces clean hot (intrinsically blue) populations using Gaia and 2MASS photometry alone with [a] a very small (false positives < 1%) contamination from cool (intrinsically red) luminous sources, [b] independent of extinction (limited only by S/N), and [c] with only small losses (false negatives < 10%) of real OB stars. Applying the method to Gaia DR3 data we are able to recover extinguished OB stars down to E(G_BP-G_RP) = 5, producing a catalog of ~2x10^5 candidate OB stars that reaches beyond the Scutum-Centaurus arm. This method can potentially extend the sample of known OB stars by an order of magnitude, which would yield a large leap in our knowledge of the populations of compact-object progenitors, including gravitational-wave sources.
ER  -