The K-band luminosity density measured from our sample is 2 times higher than those measured from the 2MASS redshift sample, the largest local K-selected redshift sample.
Note the smooth NIR light (blue-green) compared to the clumpy MIR light (red).
The red edge of the J-band, as defined by the 2MASS filters, is somewhat sensitive to the amount of precipitable water in the atmosphere. In astronomy, a photometric system is a set of well-defined passbands (or optical filters), with a known sensitivity to incident radiation.The sensitivity usually depends on the optical system, detectors and filters used. The J-band channel of 2MASS was the most sensitive to objects with J-K s < 1.5 mag. The HK spectra of both components imply low gravity and a dusty atmosphere for the secondary. It is the remnant of a supernova in AD 1054, observed as a "guest star" by the Chinese in today's constellation Taurus. Atlas Images. Conversely, intrinsically red objects (J-K s > 1.5 mag) are more favorably detected in the K s band. They are infrared images and therefore must be mapped into false colors: J light (1.2 µm) into blue, H light (1.6 µm) in green, and K s light (2.2 µm) into red.The Atlas Images were produced in the 2MASS Production Processing System. IPAC News • May 15th, 2020 Dear Colleagues and Friends, Like the rest of the science ecosystem, we at IPAC have been adapting to the challenges of the time, protecting the health and safety of our staff while pursuing our mission of advancing the exploration of the universe. The internal RA (top) and DEC (bottom) positional repeatability of all sources in the P161-D calibration field are shown in Figure 7 versus K s magnitude. Single-band "J-only" sources will be common at high galactic latitude, where they represent faint stars and galaxies just at the Survey's detection limit. M83: NIR + MIR; here we have combined the 2MASS J and K bands (blue and green, respectively) with the ISOCAM LW2 band (5.5 to 8.5 microns, centered on a prominent PAH emission band; denoted with a red halftone). The differential extended source counts for 2MASS Sampler are shown in Figure 6 (blue line=J; green line=H; and, red line=K s). This service enables rapid interactive viewing and retrieval of a single 2MASS Image set (J, H, and K s).The desired image can be specified based on position, target object name, or … We measured the K-band luminosity function using a complete sample of 4192 morphologically typed 2MASS galaxies with μ K s =20 mag arcsec-2 isophotal magnitudes 7
For the putative planetary mass secondary, we find J=20.0+/-0.2 mag. Comparisons to synthetic spectra yield T eff,A ~2550+/-150 K and Teff,B~1600+/-100 K, consistent … 2MASS Atlas Image Gallery at IPAC. The images in the object gallery are three-band composites constructed from 2MASS Atlas Images. Abstract. We present J-band imaging and H+K-band low-resolution spectroscopy of 2MASS 1207-3932AB, obtained with VLT NACO.
The Crab Nebula, or Messier 1, is one of the most spectacular and intensively studied objects in the sky.
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