A Radio-to-mm Census of Star-forming Galaxies in Protocluster 4C23.56 at Z=2.5: Gas Mass and Its Fraction Revealed with ALMA

被引：31

作者：

Lee, Minju M. ^{[1
,2
]}

Tanaka, Ichi ^{[3
]}

Kawabe, Ryohei ^{[1
,2
,4
]}

Kohno, Kotaro ^{[5
,6
]}

Kodama, Tadayuki ^{[4
,7
]}

Kajisawa, Masaru ^{[8
,9
]}

Yun, Min S. ^{[10
]}

Nakanishi, Kouichiro ^{[2
,4
]}

Iono, Daisuke ^{[2
,4
]}

Tamura, Yoichi ^{[5
,17
]}

Hatsukade, Bunyo ^{[5
]}

Umehata, Hideki ^{[5
,11
]}

Saito, Toshiki ^{[1
,2
]}

Izumi, Takuma ^{[3
]}

Aretxaga, Itziar ^{[12
]}

Tadaki, Ken-ichi ^{[3
]}

Zeballos, Milagros ^{[12
,13
]}

Ikarashi, Soh ^{[14
]}

Wilson, Grant W. ^{[10
]}

Hughes, David H. ^{[12
]}

Ivison, R. J. ^{[15
,16
]}

机构：

[1] Univ Tokyo, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1330033, Japan

[2] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan

[3] Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA

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

[5] Univ Tokyo, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan

[6] Univ Tokyo, Res Ctr Early Univ, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[7] Natl Astron Observ Japan, Opt & Infrared Astron Div, Mitaka, Tokyo 1818588, Japan

[8] Ehime Univ, Grad Sch Sci & Engn, Bunkyo Cho, Matsuyama, Ehime 7908577, Japan

[9] Ehime Univ, Res Ctr Space & Cosm Evolut, Bunkyo Cho, Matsuyama, Ehime 7908577, Japan

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

[11] Open Univ Japan, Mihama Ku, 2-11 Wakaba, Chiba 2618586, Japan

[12] INAOE, Aptdo Postal 51 & 216, Puebla 72000, Mexico

[13] Inst Tecnol Super Tlaxco, Predio Cristo Rey Ex Hda De Xalostoc S-N, Tlaxcala 90250, Mexico

[14] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[15] Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[16] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[17] Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648602, Japan

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 842卷 / 01期

基金：

日本学术振兴会;

关键词：

galaxies: clusters: general; galaxies: evolution; galaxies: high-redshift; galaxies: ISM; large-scale structure of universe; submillimeter: galaxies; H-ALPHA EMITTERS; HIGH-REDSHIFT GALAXIES; CO-LUMINOSITY FUNCTIONS; LESS-THAN; 1.5; MOLECULAR GAS; MAIN-SEQUENCE; DEEP FIELD; INTERSTELLAR-MEDIUM; FORMATION RATES; STELLAR MASS;

D O I：

10.3847/1538-4357/aa74c2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate gas contents of star-forming galaxies associated with protocluster 4C23.56 at z = 2.49. by using the redshifted CO (3-2) and 1.1mm dust continuum with the Atacama Large Millimeter/submillimeter Array. The observations unveil seven CO detections out of 22 targeted Ha emitters (HAEs). and four out of 19 in 1.1 mm dust continuum. They have high stellar mass (M-star > 4 x 10(10) M-circle dot) and exhibit a. specific star-formation rate typical of main-sequence star-forming. galaxies at z similar to 2.5. Different gas-mass estimators from CO. (3-2) and 1.1mm yield consistent values for simultaneous detections. The gas mass (M-gas) and gas fraction (f(gas)) are comparable to those of field galaxies, with M-gas = [0.3, 1.8] x 10(11) x (alpha(CO)/(4.36 x A(Z))) M-circle dot, where alpha(CO) is the CO-to-H-2 conversion factor and A(Z) is the additional correction factor for the metallicity dependence of alpha(CO), and < f(gas)> = 0.53 +/- 0.07 from CO (3-2). Our measurements place a constraint on the cosmic gas density of high-z protoclusters, indicating that. the protocluster is characterized by a gas density higher than that of the general fields by an order of magnitude. We found rho(H-2) similar to 5 x 10(9) M-circle dot Mpc(-3) with the CO(3-2) detections. The five ALMA CO detections occur in the region of. highest galaxy surface density,. where the density positively correlates with global star-forming efficiency (SFE) and stellar mass. Such correlations possibly indicate a critical role of the. environment on early galaxy evolution at high-z protoclusters, though future observations are necessary for confirmation.

引用

页数：23

共 151 条

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