AKARI-LMC Near-infrared Spectroscopic Catalog (ISAS/JAXA, 2013) ================================================================================ AKARI Infrared Camera Survey of the Large Magellanic Cloud. II. The Near-infrared Spectroscopic Catalog Shimonishi, T., Onaka, T., Kato, D., et al. =2013AJ....145...32S ================================================================================ ADC_Keywords: Infrared sources ; Magellanic Clouds ; Spectra, infrared Mission_Name: AKARI Keywords: catalogs - infrared: stars - Magellanic Clouds - surveys - techniques: spectroscopic Description: This catalog contains the 2111 near-infrared spectra of point sources in the Large Magellanic Cloud (LMC) with the Infrared Camera (IRC) on board AKARI satellite on the phase 2. In this spectroscopic survey, the slit-less prism multiobject spectroscopy mode was used to obtain 2--5 micron low- resolution (R~20) spectra. Since spectroscopic survey was performed by the slit-less spectroscopy, an overlap of object's spectrum in the dispersion direction makes an accurate extraction of spectral data very difficult. The presence or absence of spectral overlapping for sources is checked by using the IRC N3 imaging data (Kato et al. 2012). The sources without spectral contamination or sources with partial and weak contamination are selected in this catalog. The catalog sources are matched with several photometric catalogs in the literatures. See Shimonishi et al. (2013), for detail. The IRC observations produce datasets with two different exposure times in one observation, which are referred to as long- and short-exposure data. Data users must be careful about the effect of saturation in the spectra. The saturation limits of long- and short- exposure observations are estimated to be ~0.1 and ~0.5--1.0 Jy around 2.5--3.0 micron, respectively. Thus it is recommended to check both exposure data and consider to use short-exposure data especially for bright or blue sources. It is also advised to use data at 2.5--5.0 micron for scientific purpose, because the spectral ranges of 2.0--2.5 micron and 5.0--5.5 micron are difficult to calibrate accurately due to the steep shape of the spectral response curve. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe.txt 80 . This file source_list.txt 318 2111 Source list (1) FS/long/* . 659 Individual NIR spectra (2,3) FS/short/* . 652 Individual NIR spectra (2) SS/long/* . 1452 Individual NIR spectra (2) SS/short/* . 1452 Individual NIR spectra (2) -------------------------------------------------------------------------------- Note (1): Frame-/source-IDs, positions, observation date, contamination flag and photometric values from matched catalogs are summarized for all sources. Corresponding IDs in the AKARI/IRC LMC point source catalog (OBJID, Kato et al. 2012) are also provided, thus the sources between the spectroscopic and photometric catalogs can be matched by using OBJID. Note (2): Spectral files containing 2.0--5.5 micron spectra are provided in text file; the name of each file is represented by a combination of frame-ID (F-ID) and source-ID (S-ID) with extension .spc; e.g., "2200003.136.spc". Image data of spectral plot are also provided for a visualization (PNG formats extensions .png); the plotted spectrum (upper panel) and the spectral extraction box (lower panel) are shown in these image files. Two red lines in the lower panel indicate the region that is used to extract the spectrum. Data users can check the positions of other sources near the target by eyes. The catalog sources are separated into two categories depending on the degree of the spectral contamination: FS sources: full 2.0--5.0 micron spectra are available without contamination. SS sources: only short wavelength side (typically 2--4 micron) spectra are available due to partial spectral contamination. For each categories, long- and short-exposure spectra are provided. For SS sources, wavelength regions affected by the contamination are removed from the spectra, and the corresponding flux and errors are set to NaN. In addition, the position of contaminating sources are shown in the spectral plot by the blue line (in the spectral plot) and star symbol (in the spectral extraction box). The file name of short-exposure data is expressed with suffix _short, e.g., "2200003.136_short.spc". Note (3): Only the text spectral files of long-exposure data in FS are provided for the following seven IDs: 2200074.34, 2201137.189, 2210220.101, 2210229.45, 2211375.199, 2213061.111, 2213132.31 -------------------------------------------------------------------------------- See also: AKARI Infrared Camera Survey of the Large Magellanic Cloud. I. Point-source Catalog Kato, D., Ita, Y., Onaka, T., et al. =2012AJ....144..179K Byte-by-byte Description of file: source_list.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 19 A19 --- OBJID Source identifier (Jhhmmss.ss-ddmmss.s) 22- 28 A7 --- F-ID Frame ID 31- 33 A3 --- S-ID Source ID 36- 44 F9.6 deg RA Right ascension 2000 47- 56 F10.6 deg DEC Declination 2000 59- 68 A10 --- OBSDATE Observation date 71- 72 A2 --- flag Contamination flag 75- 78 A4 --- SSID Matched SAGE-Spec source ID (1) 81- 86 F6.3 mag J 2MASS J magnitude (2) 89- 94 F6.3 mag Jerr magnitude error (2) 97- 102 F6.3 mag H 2MASS H magnitude (2) 105- 110 F6.3 mag Herr magnitude error (2) 113- 118 F6.3 mag K 2MASS Ks magnitude (2) 121- 126 F6.3 mag Kerr magnitude error (2) 129- 134 F6.3 mag B1 IRAC [3.6] magnitude (2) 137- 142 F6.3 mag B1err magnitude error (2) 145- 150 F6.3 mag B2 IRAC [4.5] magnitude (2) 153- 158 F6.3 mag B2err magnitude error (2) 161- 166 F6.3 mag B3 IRAC [5.8] magnitude (2) 169- 174 F6.3 mag B3err magnitude error (2) 177- 182 F6.3 mag B4 IRAC [8.0] magnitude (2) 185- 190 F6.3 mag B4err magnitude error (2) 193- 198 F6.3 mag M24 MIPS [24] magnitude (2) 201- 206 F6.3 mag M24err magnitude error (2) 209- 214 F6.3 mag M70 MIPS [70] magnitude (2) 217- 222 F6.3 mag M70err magnitude error (2) 225- 230 F6.3 mag M160 MIPS [160] magnitude (2) 233- 238 F6.3 mag M160err magnitude error (2) 241- 246 F6.3 mag N3 IRC N3 magnitude (2) 249- 254 F6.3 mag N3err magnitude error (2) 257- 262 F6.3 mag S7 IRC S7 magnitude (2) 265- 270 F6.3 mag S7err magnitude error (2) 273- 278 F6.3 mag S11 IRC S11 magnitude (2) 281- 286 F6.3 mag S11err magnitude error (2) 289- 294 F6.3 mag L15 IRC L15 magnitude (2) 297- 302 F6.3 mag L15err magnitude error (2) 305- 310 F6.3 mag L24 IRC L24 magnitude (2) 313- 318 F6.3 mag L24err magnitude error (2) -------------------------------------------------------------------------------- Note (1): Non-matched sources are represented by -1. Note (2): Unavailable photometric values are represented by 99.999. -------------------------------------------------------------------------------- Byte-by-byte Description of file: *.spc -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 F5.3 micron Lambda Wavelength in micron 8- 13 F6.2 mJy Flux Observed NIR flux (1) 16- 21 F6.2 mJy e_Flux Lower uncertainty in Flux (1) 24- 29 F6.2 mJy E_Flux Upper uncertainty in Flux (1) -------------------------------------------------------------------------------- Note (1): NaN value is allocated to unavailable data points (due to saturation, spectral overlapping, truncation at the detector edge, etc.). -------------------------------------------------------------------------------- History: * 24-Jul-2012: Original version ================================================================================ (End) Takashi Shimonishi [Kobe University] 7-Jan-2013