Large Molecular and Dust Reservoir of a Gravitationally Lensed Submillimeter Galaxy behind the Lupus I Molecular Cloud
Artikel i vetenskaplig tidskrift, 2025

We report the Australian Telescope Compact Array and Nobeyama 45 m telescope detection of a remarkably bright (S1.1mm = 44 mJy) submillimeter galaxy MM J154506.4−344318 in emission lines at 48.5 and 97.0 GHz, respectively. We also identify part of an emission line at ≈218.3 GHz using the Atacama Large Millimeter/submillimeter Array (ALMA). Together with photometric redshift estimates and the ratio between the line and infrared luminosities, we conclude that the emission lines are most likely to be the J = 2-1, 4-3, and 9-8 transitions of 12CO at redshift z = 3.753 ± 0.001. ALMA 1.3 mm continuum imaging reveals an arc and a spot separated by an angular distance of 1 . ″ 6 , indicative of a strongly lensed dusty star-forming galaxy with respective molecular and dust masses of log M mol / M ⊙ ≈ 11.5 and log M dust / M ⊙ ≈ 9.4 after being corrected for ≈6.6× gravitational magnification. The inferred dust-to-gas mass ratio is found to be high (≈0.0083) among coeval dusty star-forming galaxies, implying the presence of a massive, chemically enriched reservoir of cool interstellar medium at z ≈ 4, or 1.6 Gyr after the Big Bang.

Författare

Y. Tamura

Nagoya University

Akio Taniguchi

Nagoya University

Kitami Institute of Technology

Tom Bakx

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

I. de Gregorio-Monsalvo

European Southern Observatory Santiago

Masato Hagimoto

Nagoya University

S. Ikarashi

Fukuoka Institute of Technology

National Astronomical Observatory of Japan

Nihon University

Ryohei Kawabe

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

Kotaro Kohno

University of Tokyo

Research Center for the Early Universe

Kouichiro Nakanishi

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

Tatsuya Takekoshi

Kitami Institute of Technology

Yoshito Shimajiri

Kyushu Kyoritsu Univ

Takashi Tsukagoshi

Ashikaga University

B. Hatsukade

The Graduate University for Advanced Studies (SOKENDAI)

National Astronomical Observatory of Japan

D. Iono

The Graduate University for Advanced Studies (SOKENDAI)

National Astronomical Observatory of Japan

Hideo Matsuhara

JAXA Institute of Space and Astronautical Science

The Graduate University for Advanced Studies (SOKENDAI)

Kazuya Saigo

Kagoshima University

Masao Saito

National Astronomical Observatory of Japan

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 981 1 51

Ämneskategorier (SSIF 2025)

Atom- och molekylfysik och optik

Astronomi, astrofysik och kosmologi

DOI

10.3847/1538-4357/adb1b9

Mer information

Senast uppdaterat

2025-03-12