Blowing star formation away in AGN hosts (BAH)

Rogemar A. Riffel; Carlos R. Melo-Carneiro; Gabriel Luan Souza-Oliveira; Rogério Riffel; Cristina Furlanetto; Nadia L. Zakamska; Santiago Arribas; Marina Bianchin; Ana L. Chies-Santos; José Henrique Costa-Souza; Maitê S. Z. de Mellos; Michele Perna; Thaisa Storchi-Bergmann

doi:10.1051/0004-6361/202556329

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Volume 701 (September 2025)

A&A, 701 (2025) L11

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Issue		A&A Volume 701, September 2025


Article Number		L11
Number of page(s)		7
Section		Letters to the Editor
DOI		https://doi.org/10.1051/0004-6361/202556329
Published online		19 September 2025

A&A 701, L11 (2025)

Letter to the Editor

III. Serendipitous discovery of a z ∼ 2.9 star-forming galaxy lensed by the galactic bulge of CGCG 012-070 using JWST NIRSpec

Rogemar A. Riffel¹^,2^⋆, Carlos R. Melo-Carneiro³, Gabriel Luan Souza-Oliveira²^,1, Rogério Riffel³, Cristina Furlanetto⁴, Nadia L. Zakamska⁵, Santiago Arribas¹, Marina Bianchin⁶, Ana L. Chies-Santos³, José Henrique Costa-Souza²^,1, Maitê S. Z. de Mellos², Michele Perna¹ and Thaisa Storchi-Bergmann³

¹ Centro de Astrobiología (CAB), CSIC-INTA, Ctra. de Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid, Spain
² Departamento de Física, CCNE, Universidade Federal de Santa Maria, Av. Roraima 1000, 97105-900 Santa Maria, RS, Brazil
³ Departamento de Astronomia, IF, Universidade Federal do Rio Grande do Sul, CP 15051, 91501-970 Porto Alegre, RS, Brazil
⁴ Departamento de Física, IF, Universidade Federal do Rio Grande do Sul, CP 15051, 91501-970 Porto Alegre, RS, Brazil
⁵ Department of Physics & Astronomy, Johns Hopkins University, Bloomberg Ctr, 3400 N. Charles St, Baltimore, MD 21218, USA
⁶ Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697, USA

^⋆ Corresponding author.

Received: 9 July 2025
Accepted: 1 September 2025

Abstract

We report the detection of a gravitationally lensed galaxy by the nearby spiral galaxy CGCG 012-070 (z = 0.048) using integral field unit (IFU) observations with the Near-Infrared Spectrograph (NIRSpec) instrument on board the James Webb Space Telescope (JWST). The lensed galaxy is identified through the flux distributions of emission lines in the rest-frame optical, consistent with a source located at a redshift of z ∼ 2.89. The system is detected in [O III] λλ4959, 5007, Hβ, and Hα emission lines, exhibiting line ratios typical of a star-forming galaxy. The emission-line flux distributions reveal three distinct components, which are modeled using an elliptical power-law mass profile for the lens galaxy. This model provides a good characterization of the source and reveals a disturbed star-forming morphology consistent with those of galaxies at cosmic noon. This serendipitous discovery of a rare low-redshift strong lens highlights the critical role of IFU observations in expanding the lens census and advancing our understanding of galaxy mass profiles and evolution.

Key words: gravitational lensing: strong / galaxies: active / galaxies: kinematics and dynamics / galaxies: spiral

Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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