No [C II] or dust detection in two Little Red Dots at zspec > 7 Xiao, Mengyuan Oesch, Pascal A. Bing, Longji Elbaz, David Matthee, Jorryt J ; https://orcid.org/0000-0003-2871-127X Fudamoto, Yoshinobu Fujimoto, Seiji Marques-Chaves, Rui Williams, Christina C. Dessauges-Zavadsky, Miroslava Valentino, Francesco Brammer, Gabriel Covelo-Paz, Alba Daddi, Emanuele Fynbo, Johan P.U. Gillman, Steven Ginolfi, Michele Giovinazzo, Emma Greene, Jenny E. Gu, Qiusheng Illingworth, Garth Inayoshi, Kohei Kokorev, Vasily Meyer, Romain A. Naidu, Rohan P. Reddy, Naveen A. Schaerer, Daniel Shapley, Alice Stefanon, Mauro Steinhardt, Charles L. Setton, David J. Vestergaard, Marianne Wang, Tao ddc:520 Little Red Dots (LRDs) are compact, point-like sources characterized by their red color and broad Balmer lines; it is a matter of debate whether they are dominated by active galactic nuclei (AGNs) or dusty star-forming galaxies (DSFGs). Here we report two LRDs (ID9094 and ID2756) at zspec > 7 recently discovered in the JWST FRESCO GOODS-North field. Both satisfy the “v-shaped” color and compactness criteria for LRDs and are identified as Type-I AGN candidates based on their broad Hβ emission lines (full width at half maximum: 2280 ± 490 km s−1 for ID9094 and 1070 ± 240 km s−1 for ID2756) and narrow [O III] lines (≃300 − 400 km s−1). To investigate their nature, we conducted deep NOEMA follow-up observations targeting the [C II] 158 μm emission line and the 1.3 mm dust continuum. We do not detect [C II] or 1.3 mm continuum emission for either source. If the two LRDs were DSFGs, we would expect significant detections: > 16σ for [C II] and > 3σ for the 1.3 mm continuum of ID9094, and > 5σ for the [C II] of ID2756. Using the 3σ upper limits of [C II] and 1.3 mm, we performed two analyses: (1) UV-to-far-infrared spectral energy distribution fitting with and without AGN components, and (2) comparison of their properties with the L[C II]–SFRtot empirical relation. Both analyses are consistent with a scenario in which AGN activity contributes to the observed properties, though a dusty star-forming origin cannot be fully ruled out. Our results highlight the importance of far-infrared observations for studying LRDs, a regime that remains largely unexplored. EDP Sciences 2025 info:eu-repo/semantics/article doc-type:Article Article http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/20294 https://research-explorer.ista.ac.at/download/20294/20308 Xiao M, Oesch PA, Bing L, et al. No [C II] or dust detection in two Little Red Dots at zspec &#62; 7. <i>Astronomy &#38; Astrophysics</i>. 2025;700. doi:<a href="https://doi.org/10.1051/0004-6361/202554361">10.1051/0004-6361/202554361</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202554361 info:eu-repo/semantics/altIdentifier/issn/0004-6361 info:eu-repo/semantics/altIdentifier/e-issn/1432-0746 info:eu-repo/semantics/altIdentifier/wos/001559174700004 info:eu-repo/semantics/altIdentifier/arxiv/2503.01945 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess