Physical Characterization of Serendipitously Uncovered Millimeter-wave Line-emitting Galaxies at z ∼ 2.5 behind the Local Luminous Infrared Galaxy VV 114

被引：4

作者：

Mizukoshi, Shoichiro ^{[1
,2
]}

Kohno, Kotaro ^{[1
,3
]}

Egusa, Fumi ^{[1
]}

Hatsukade, Bunyo ^{[1
]}

Minezaki, Takeo ^{[1
]}

Saito, Toshiki ^{[4
]}

Tamura, Yoichi ^{[5
]}

Iono, Daisuke ^{[6
,7
]}

Ueda, Junko ^{[6
]}

Matsuda, Yuichi ^{[6
,7
]}

Kawabe, Ryohei ^{[6
,7
]}

Lee, Minju M. ^{[8
]}

Yun, Min S. ^{[9
]}

Espada, Daniel ^{[10
]}

机构：

[1] Univ Tokyo, Inst Astron, Grad Sch Sci, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan

[2] Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[3] Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[5] Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Nagoya, Aichi 4648602, Japan

[6] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[7] Grad Univ Adv Studies SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan

[8] Max Planck Inst Extraterr Phys MPE, Giessenbachstr, D-85748 Garching, Germany

[9] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[10] Univ Granada, Dept Fis Teor & Cosmos, Campus Fuentenueva, E-18071 Granada, Spain

来源：

ASTROPHYSICAL JOURNAL | 2021年 / 917卷 / 02期

关键词：

STAR-FORMING GALAXIES; ALMA SPECTROSCOPIC SURVEY; MOLECULAR GAS; SUBMILLIMETER GALAXIES; DUST-CONTINUUM; INTERSTELLAR-MEDIUM; SCALING RELATIONS; ANGULAR-MOMENTUM; FIELD; CO;

D O I：

10.3847/1538-4357/ac01cc

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a detailed investigation of millimeter-wave line emitters ALMA J010748.3-173028 (ALMA-J0107a) and ALMA J010747.0-173010 (ALMA-J0107b), which were serendipitously uncovered in the background of the nearby galaxy VV 114 with spectral scan observations at lambda = 2-3 mm. Via Atacama Large Millimeter/submillimeter Array (ALMA) detection of CO(4-3), CO(3-2), and [C i](1-0) lines for both sources, their spectroscopic redshifts are unambiguously determined to be z = 2.4666 +/- 0.0002 and z = 2.3100 +/- 0.0002, respectively. We obtain the apparent molecular gas masses M-gas of these two line emitters from [C i] line fluxes as (11.2 +/- 3.1) x 10(10) M-circle dot and (4.2 +/- 1.2) x 10(10) M-circle dot, respectively. The observed CO(4-3) velocity field of ALMA-J0107a exhibits a clear velocity gradient across the CO disk, and we find that ALMA-J0107a is characterized by an inclined rotating disk with a significant turbulence, that is, a deprojected maximum rotation velocity to velocity dispersion ratio v(max)/sigma(v) of 1.3 +/- 0.3. We find that the dynamical mass of ALMA-J0107a within the CO-emitting disk computed from the derived kinetic parameters, (1.1 +/- 0.2) x 10(10) M-circle dot, is an order of magnitude smaller than the molecular gas mass derived from dust continuum emission, (3.2 +/- 1.6) x 10(11) M-circle dot. We suggest this source is magnified by a gravitational lens with a magnification of mu greater than or similar to 10, which is consistent with the measured offset from the empirical correlation between CO-line luminosity and width.

引用

页数：15