New detections of Galactic molecular absorption systems toward ALMA calibrator sources

被引：12

作者：

Ando, Ryo ^{[1
]}

Kohno, Kotaro ^{[1
]}

Tamura, Yoichi ^{[1
]}

Izumi, Takuma ^{[1
]}

Umehata, Hideki ^{[1
,2
]}

Nagai, Hiroshi ^{[3
]}

机构：

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

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

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

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2016年 / 68卷 / 01期

关键词：

ISM: abundances; ISM: molecules; quasars: absorption lines; radio lines: ISM; INTERSTELLAR-MEDIUM; COLOGNE DATABASE; HCO EMISSION; MILLIMETER; SEARCH; GALAXY; CLOUD; SPECTROSCOPY; PLATEAU; REGIONS;

D O I：

10.1093/pasj/psv110

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on Atacama Large Millimeter/submillimeter Array (ALMA) detections of molecular absorption lines in Bands 3, 6, and 7 toward four radio-loud quasars, which were observed as the bandpass and complex gain calibrators. The absorption systems, three of which are newly detected, are found to be Galactic origin. Moreover, HCO absorption lines toward two objects are detected, which almost doubles the number of HCO absorption samples in the Galactic diffuse medium. In addition, high HCO-to-(HCO+)-C-13 column density ratios are found, suggesting that the interstellar media (ISM) observed toward the two calibrators are in photodissociation regions, which observationally illustrates the chemistry of diffuse ISM driven by ultraviolet (UV) radiation. These results demonstrate that calibrators in the ALMA Archive are potential sources for the quest for new absorption systems and for detailed investigation of the nature of the ISM.

引用

页数：11

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