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200 papers

In this paper, we investigate the conditions for the HI-to-H$_{2}$ transition in the solar neighborhood by analyzing HI emission and absorption measurements toward 58 Galactic lines of sight (LOSs) along with $^{12}$CO(1$-$0) (CO) and dust…

Using the VLA and ALMA, we have obtained CO(2-1), [C II], [N II] line emission and multiple dust continuum measurements in a sample of "normal" galaxies at $z=5-6$. We report the highest redshift detection of low-$J$ CO emission from a…

Astrophysics of Galaxies · Physics 2019-09-25 Riccardo Pavesi , Dominik A. Riechers , Andreas L. Faisst , Gordon J. Stacey , Peter L. Capak

We have carried out a multi-species study of a region which has had previous measurements of strong magnetic fields through the CN Zeeman effect in order to to explore the relationship between CN and N$_2$H$^+$, both of which have evidence…

Solar and Stellar Astrophysics · Physics 2012-09-03 Nicholas S. Hakobian , Richard M. Crutcher

Gravitational accretion accumulates the original mass, and this process is crucial for us to understand the initial phases of star formation. Using the specific infall profiles in optically thick and thin lines, we searched the clumps with…

Astrophysics of Galaxies · Physics 2020-09-02 Yang Yang , Zhibo Jiang , Zhiwei Chen , Shaobo Zhang , Shuling Yu , Yiping Ao

The molecular gas in the Central Molecular Zone (CMZ) of the Galaxy has been studied using infrared absorption spectra of H$_3^+$ lines at 3.5-4.0 $\mu$m and CO lines near 2.34 $\mu$m. In addition to the previously reported spectra of these…

High Energy Astrophysical Phenomena · Physics 2019-10-14 Takeshi Oka , T. R. Geballe , Miwa Goto , Tomonori Usuda , Benjamin , J. McCall , Nick Indriolo

The Large Magellanic Cloud (LMC) provides a key laboratory for exploring the diversity of star formation and interstellar chemistry under subsolar metallicity conditions. We present the results of a hot core survey toward 30 massive…

Astrophysics of Galaxies · Physics 2026-02-05 Takashi Shimonishi , Kei E. I. Tanaka , Yichen Zhang , Kenji Furuya , Yu Cheng , Asako Sato

We have simultaneously observed $^{12}$CO, $^{13}$CO, and C$^{18}$O (J=1$-$0) rotational transitions in the centers of a sample of 58 nearby spiral galaxies using the 13.7-m millimeter-wave telescope of the Purple Mountain Observatory.…

Astrophysics of Galaxies · Physics 2015-06-03 Fa-Cheng Li , Yuan-Wei Wu , Ye Xu

The circumgalactic medium (CGM) is a crucial component of galaxy evolution, but thus far its physical properties are highly unconstrained. As of yet, no cosmological simulation has reached convergence when it comes to constraining the cold…

We explore molecular cloud properties and the physics of CO transition lines in z >~ 6 Lyman-break galaxies and predict their CO fluxes using an analytic formalism built from global models of star formation in high-redshift galaxies that…

Cosmology and Nongalactic Astrophysics · Physics 2014-04-09 Joseph A. Muñoz , Steven R. Furlanetto

We present observations with the IRAM Plateau de Bure Interferometer of three QSOs at z>5 aimed at detecting molecular gas in their host galaxies as traced by CO transitions. CO (5-4) is detected in SDSSJ033829.31+002156.3 at z=5.0267,…

Context. To further understand the processes involved in the formation of massive stars, we have undertaken a study of the gas dynamics surrounding three massive star forming regions. By observing the large scale structures at high…

Solar and Stellar Astrophysics · Physics 2015-05-27 P. D. Klaassen , C. D. Wilson , E. R. Keto , Q. Zhang , R. Galván-Madrid , H-Y. B. Liu

We report the identification of four millimeter line emitting galaxies with the Atacama Large Milli/submillimeter Array (ALMA) in SSA22 Field (ADF22). We analyze the ALMA 1.1 mm survey data, with an effective survey area of 5 arcmin$^2$, a…

We present a new data release from the Fiber Multi-Object Spectrograph (FMOS)-COSMOS survey, which contains the measurements of spectroscopic redshift and flux of rest-frame optical emission lines (H$\alpha$, [NII], [SII], H$\beta$, [OIII])…

A 3 $\times$ 3 map of the Galactic Center was made at 9$\arcmin$ resolution and 10$\arcmin$ spacing in the CH $^2\Pi_{1/2}$, J=1/2, F=1-1 transition at 3335 MHz. The CH emission shows a velocity extent that is nearly that of the CO(1-0)…

Astrophysics · Physics 2009-11-13 Loris Magnani , Susan Zelenik , T. M. Dame , B. Engebreth

We performed spectroscopic analyses of five local compact star-forming galaxies (CSFGs) with extremely high [OIII]/[OII] (O$_{32}$) ratios ($>20$). These targets remarkably share similar properties with high-redshift CIV emitters at $z>6$:…

Astrophysics of Galaxies · Physics 2024-09-19 Intae Jung , Swara Ravindranath , Anne E. Jaskot , Henry C. Ferguson , Bethan L. James

We report the detection of CO(1-0) emission toward the lensed L*_UV Lyman-break galaxies (LBGs) MS1512-cB58 (z=2.73) and the Cosmic Eye (z=3.07), using the Expanded Very Large Array. The strength of the CO line emission reveals molecular…

Cosmology and Nongalactic Astrophysics · Physics 2012-01-27 Dominik A. Riechers , Christopher L. Carilli , Fabian Walter , Emmanuel Momjian

We present IRAM PdBI observations of the CO(3-2) and CO(5-4) line transitions from a Ly-alpha blob at z~2.7 in order to investigate the gas kinematics, determine the location of the dominant energy source, and study the physical conditions…

Astrophysics of Galaxies · Physics 2015-06-18 Yujin Yang , Fabian Walter , Roberto Decarli , Frank Bertoldi , Axel Weiss , Arjun Dey , Moire K. M. Prescott , Toma Badescu

(Abridged) High-mass star formation is far less understood than low-mass star formation. It entails molecular outflows, which disturb the protostellar clump. Studying these outflows and the shocked gas they cause is key for a better…

Astrophysics of Galaxies · Physics 2023-09-27 N. Guerra-Varas , M. Merello , L. Bronfman , N. Duronea , D. Elia , R. Finger , E. Mendoza

We present ALMA observations of the dwarf starburst galaxy Henize 2-10 in combination with previous SMA CO observations to probe the molecular environments of natal super star clusters. These observations include the HCO$^+$(1-0), HCN(1-0),…

We present observations of redshifted CO(1-0) and CO(2-1) in a field containing an overdensity of Lyman break galaxies (LBGs) at z=5.12. Our Australia Telescope Compact Array observations were centered between two…