DOI QR코드

DOI QR Code

miniTAO/ANIR Paα SURVEY OF LOCAL LIRGs

  • Tateuchi, Ken ;
  • Motohara, Kentaro ;
  • Konishi, Masahiro ;
  • Takahashi, Hidenori ;
  • Kato, Natsuko ;
  • Uchimoto, Yuka K. ;
  • Toshikawa, Koji ;
  • Ohsawa, Ryou ;
  • Kitagawa, Yutaro ;
  • Yoshii, Yuzuru ;
  • Doi, Mamoru ;
  • Kohno, Kotaro ;
  • Kawara, Kimiaki ;
  • Tanaka, Masuo ;
  • Miyata, Takashi ;
  • Tanabe, Toshihiko ;
  • Minezaki, Takeo ;
  • Sako, Shigeyuki ;
  • Morokuma, Tomoki ;
  • Tamura, Yoichi ;
  • Aoki, Tsutomu ;
  • Soyano, Takeo ;
  • Tarusawa, Kenfichi ;
  • Koshida, Shintaro ;
  • Kamizuka, Takafumi ;
  • Nakamura, Tomohiko ;
  • Asano, Kentaro ;
  • Uchiyama, Mizuho ;
  • Okada, Kazushi ;
  • Ita, Yoshifusa
  • Received : 2012.06.30
  • Accepted : 2012.07.23
  • Published : 2012.09.16

Abstract

ANIR (Atacama Near InfraRed camera) is a near infrared camera for the University of Tokyo Atacama 1m telescope, installed at the summit of Co. Chajnantor (5,640 m altitude) in northern Chile. The high altitude and extremely low water vapor (PWV = 0.5 mm) of the site enable us to perform observation of hydrogen $Pa{\alpha}$ emission line at $1.8751{\mu}m$. Since its first light observation in June 2009, we have been carrying out a $Pa{\alpha}$ narrow-band imaging survey of nearby luminous infrared galaxies (LIRGs), and have obtained $Pa{\alpha}$ for 38 nearby LIRGs listed in AKARI/FIS-PSC at the velocity of recession between 2,800 km/s and 8,100 km/s. LIRGs are affected by a large amount of dust extinction ($A_V$~ 3 mag), produced by their active star formation activities. Because $Pa{\alpha}$ is the strongest hydrogen recombination line in the infrared wavelength ranges, it is a good and direct tracer of dust-enshrouded star forming regions, and enables us to probe the star formation activities in LIRGs. We find that LIRGs have two star-forming modes. The origin of the two modes probably come from differences between merging stage and/or star-forming process.

Keywords

infrared: $Pa{\alpha}$;galaxies: LIRGs;conferences: proceedings

References

  1. Goto, et al., 2010, Evolution of Infrared Luminosity Functions of Galaxies in the AKARI NEP-Deep Field. Revealing the Cosmic Star Formation History Hidden by Dust, A&A, 514, A6 https://doi.org/10.1051/0004-6361/200913182
  2. Alonso-Herrero, et al., 2006, Near-Infrared and Starforming Properties of Local Luminous Infrared Galaxies, ApJ, 650, 835 https://doi.org/10.1086/506958
  3. Conselice, et al., 2003, The Relationship between Stellar Light Distributions of Galaxies and Their Formation Histories, ApJS, 147, 1 https://doi.org/10.1086/375001
  4. Yoshii, et al., 2010, The University of Tokyo Atacama Observatory 6.5 m telescope project, Proc. SPIE, 7733

Cited by

  1. Active Galactic Nucleus and Extended Starbursts in a Midstage Merger VV 114 vol.65, pp.3, 2013, https://doi.org/10.1093/pasj/65.3.L7
  2. Investigating AGN/Starburst activities through ALMA multi-line observations in the mid-stage IR-bright merger VV 114 vol.10, pp.S309, 2014, https://doi.org/10.1017/S174392131400965X
  3. ANIR: Atacama near-infrared camera for the 1.0 m miniTAO telescope vol.67, pp.1, 2015, https://doi.org/10.1093/pasj/psu148
  4. ALMA MULTI-LINE OBSERVATIONS OF THE IR-BRIGHT MERGER VV 114 vol.803, pp.2, 2015, https://doi.org/10.1088/0004-637X/803/2/60

Acknowledgement

Supported by : JSPS