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Search for Quasar Pairs with ${\it Gaia}$ Astrometric Data. III. Discovery of 9 dual and projected quasars

T0 review · 0 major / 3 minor · reviewed 2026-07-02 · grok-4.3

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Pith's one-line read Spectroscopic observations confirm 6 dual quasars and 3 projected quasars from 11 Gaia-selected candidates.

desk verdict This paper adds spectroscopic confirmations for 6 dual quasars and 3 projected ones from Gaia-selected candidates, extending their own series with modest but direct new objects. read the letter →

arxiv 2607.00093 v1 pith:VRDCDTOI submitted 2026-06-30 astro-ph.GA

Qihang Chen , Zizhao He , Zhuojun Deng , Liang Jing , Xingyu Zhu , Jianghua Wu This is my paper · ORCID
classification astro-ph.GA
keywords quasarpairsdualquasarsprojectedGaiaastrometryspectroscopicconfirmationphotometricredshiftsMGQPCcataloghigh-redshift
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper presents low-resolution long-slit spectroscopic observations of 11 quasar pair candidates drawn from the MGQPC catalog. These observations confirm 6 as dual quasars, including one at redshift approximately 3.1, and 3 as projected quasars. The work shows that photometric redshifts help reduce contamination from projections and explains why earlier surveys missed several of these objects. It also reviews confirmation strategies for dual and lensed systems ahead of large-scale surveys.

What carries the argument

Low-resolution long-slit spectroscopic follow-up on three telescopes to classify Gaia-selected quasar pair candidates as dual, projected, or otherwise.

What would settle it

Higher-resolution spectra or imaging that show any of the six dual quasars to be single objects, stars, or line-of-sight projections at different redshifts would falsify the reported discoveries.

Watch

Extended reading notes

Core claim

We report the low-resolution long-slit spectroscopic observations and confirmations of 11 quasar pair candidates selected from the MGQPC catalog. The major discoveries include 6 dual quasars and 3 projected quasars. One of the dual quasars has a high redshift of ∼3.1. The LQ hypothesis of 3 dual quasars cannot be completely ruled out. We investigated the reason why previous spectroscopic surveys missed several new quasars and discussed a projected quasar with a wide-separation lensing configuration as well as two quasar-star projections.

Load-bearing premise

The photometric redshifts extracted from Paper-II are sufficiently accurate to prioritize candidates and mitigate contamination from projected quasars and quasar-star projections.

Editorial extensions

If this is right

  • Photometric redshifts reduce contamination from projected quasars and quasar-star projections in candidate lists.
  • Previous spectroscopic surveys missed several new quasars for reasons that can now be addressed in selection.
  • A projected quasar with wide-separation lensing configuration and two quasar-star projections that mimic lensed systems are identified.
  • Confirmation strategies for dual and lensed quasar candidates are reviewed and outlined for future large-scale surveys.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Applying the same Gaia-plus-photometric-redshift selection to larger samples could increase the known population of dual quasars at z greater than 3.
  • High-resolution imaging follow-up on the three dual candidates whose lensing status remains open would clarify whether any are actually lensed systems.
  • The methods used here to handle quasar-star projections offer a template for cleaning candidate lists in other wide-field pair searches.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

0 major / 3 minor

Summary. The paper reports low-resolution long-slit spectroscopic observations confirming 11 quasar pair candidates selected from the MGQPC catalog (Paper I), using five spectrographs on three telescopes. This yields six dual quasars (one at z ≈ 3.1) and three projected quasars; the LQ hypothesis cannot be fully ruled out for three of the duals. The work examines why prior surveys missed several objects, discusses a wide-separation lensing configuration and two quasar-star projections, illustrates the utility of photometric redshifts from Paper II for reducing contamination, and reviews confirmation strategies for dual/lensed quasars in the context of large surveys.

Significance. If the spectroscopic classifications hold, the addition of six dual quasars (including a high-redshift example) enlarges the sample available for studies of supermassive black hole pairs and merger-driven evolution. The explicit discussion of selection biases, contamination mitigation via photometric redshifts, and future confirmation strategies in the era of large spectroscopic surveys provides practical guidance beyond the specific discoveries.

minor comments (3)
  1. [Abstract] Abstract: the claim of 'confirmations' would be strengthened by explicit reference to the figures or tables that display the spectra, line identifications, and redshift measurements for the 11 candidates.
  2. [Spectroscopic observations section] The description of the five spectrographs and three telescopes would benefit from a compact table listing instrument, telescope, resolution, wavelength coverage, and typical exposure times to allow readers to assess data quality at a glance.
  3. [Discussion of photometric redshifts] The statement that photometric redshifts from Paper II 'illustrate their positive role' is useful, but a short quantitative comparison (e.g., fraction of candidates rejected by photo-z cuts) would make the mitigation claim more concrete.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive and constructive report, which recommends minor revision. The assessment accurately captures the scope of our spectroscopic follow-up and the broader context we provide on selection biases and confirmation strategies. No major comments requiring point-by-point rebuttal were raised in the report.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity

full rationale

This is an observational discovery paper whose central claims consist of direct low-resolution long-slit spectroscopic confirmations of 11 candidates, yielding 6 dual quasars and 3 projected quasars. These rest on the new spectra themselves rather than on any derivation, fit, or prediction. Photometric redshifts extracted from Paper II are invoked only illustratively to discuss selection and contamination mitigation; they do not enter the reported redshifts or classifications. No equations, fitted parameters, or self-citation chains reduce the confirmation results to prior inputs by construction. The work is therefore self-contained against external spectroscopic benchmarks.

Assumptions & free parameters 0 free parameters · 0 assumptions · 0 invented entities

No mathematical derivations, free parameters, or invented entities. The work is purely observational confirmation relying on standard assumptions of quasar spectral identification and photometric redshift utility.

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Cite this review

Pith. "Pith review of Search for Quasar Pairs with ${\it Gaia}$ Astrometric Data. III. Discovery of 9 dual and projected quasars." pith.science (2026). https://pith.science/paper/VRDCDTOI

@misc{pith2026260700093,
  author       = {Pith},
  title        = {Pith review of: Search for Quasar Pairs with $\it Gaia$ Astrometric Data. III. Discovery of 9 dual and projected quasars},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/VRDCDTOI}},
  note         = {Machine review of arXiv:2607.00093}
}
abstract

We report the low-resolution long-slit spectroscopic observations and confirmations of 11 quasar pair candidates, which are selected from the MGQPC catalog presented in the first paper of our series work (hereafter, Paper-I) and the early version of this catalog. The spectroscopic follow-up was carried out with 5 spectrographs equipped on 3 telescopes, and the major discoveries include 6 dual quasars and 3 projected quasars. One of the dual quasars has a high redshift of $\sim$ 3.1. The LQ hypothesis of 3 dual quasars cannot be completely ruled out. We investigated the reason why previous spectroscopic surveys missed several new quasars. We discussed a projected quasar with a wide-separation lensing configuration, as well as two quasar-star projections that mimic the configuration of lensed quasars. The photometric redshifts for the 11 observed candidates were extracted from the second paper of our series work (hereafter, Paper-II) to illustrate their positive role in mitigating contamination from projected quasars and quasar-star projections. We also reviewed and discussed the confirmation strategies for dual and lensed quasar candidates, and outlined future confirmation strategies for them in the context of the era dominated by large-scale spectroscopic and imaging surveys.

Figures

Figures reproduced from arXiv: 2607.00093 by the authors.

Figure 1
Figure 1. Pseudo-color images of the 11 observed pairs. Except for the image of J0249+2606, which comes from a Pan-STARRS composite, the images of the remaining pairs are all from DESI-LS DR10 composites. North is up and east is to the left. The slit position during the exposure is overlaid (orange double lines) in each cutout image. For all pairs except J1601+3926, J2252+0847, and J2314+2437, the spectroscopic slit was rotat… view at source ↗
Figure 2
Figure 2. Spectra of the 6 confirmed DQs. Unfortunately, the slit of J0130+0725 was rotated to an incorrect angle, and the spectra of members A and B were heavily blended. The grey regions in the spectra of J0130+0725, J0242-1002, and J2252+0847 denote the splicing of spectra from two channels of DBSP and LAMOST. Each black open circle with a cross denotes telluric absorption at ∼ 7 600Å. All marked emission lines are attribu… view at source ↗
Figure 3
Figure 3. Similar to [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: Spectral flux ratio curves of 6 DQs. All flux ratios were obtained by dividing the spectrum of member B by that of member A, and were smoothed with appropriate Gaussian kernel parameters for visual clarity. The shaded red regions in each panel highlight the differences…
Figure 5
Figure 5. Figure 5: Color features of member B of the 11 observed targets. A subset of quasars was overlaid on each diagram as a 2D histogram with a yellow￾to-blue gradient (high to low density), and the number of quasars in each diagram is equal to 4 000. The legends for targets are in t…

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