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221. Blanco Cosmology Survey (BCS) new reduction
ID:
ivo://CDS.VizieR/J/ApJS/216/20
Title:
Blanco Cosmology Survey (BCS) new reduction
Short Name:
J/ApJS/216/20
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Blanco Cosmology Survey is a four-band (griz) optical-imaging survey of ~80deg^2^ of the southern sky. The survey consists of two fields centered approximately at (RA,DE)=(23h,-55{deg}) and (5h30m,-53{deg}) with imaging sufficient for the detection of L_*_ galaxies at redshift z<=1. In this paper, we present our reduction of the survey data and describe a new technique for the separation of stars and galaxies. We search the calibrated source catalogs for galaxy clusters at z<=0.75 by identifying spatial over-densities of red-sequence galaxies and report the coordinates, redshifts, and optical richnesses, {lambda}, for 764 galaxy clusters at z<=0.75. This sample, >85% of which are new discoveries, has a median redshift of z=0.52 and median richness {lambda}(0.4L_*_)=16.4.
222. Blanco survey of the lens BCS J2352-5452
ID:
ivo://CDS.VizieR/J/ApJ/742/48
Title:
Blanco survey of the lens BCS J2352-5452
Short Name:
J/ApJ/742/48
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report on the serendipitous discovery in the Blanco Cosmology Survey (BCS) imaging data of a z=0.9057 galaxy that is being strongly lensed by a massive galaxy cluster at a redshift of z=0.3838. The lens (BCS J2352-5452) was discovered while examining i- and z-band images being acquired in 2006 October during a BCS observing run. Follow-up spectroscopic observations with the Gemini Multi-Object Spectrograph instrument on the Gemini-South 8m telescope confirmed the lensing nature of this system. Using weak-plus-strong lensing, velocity dispersion, cluster richness N_200_, and fitting to a Navarro-Frenk-White (NFW) cluster mass density profile, we have made three independent estimates of the mass M_200_ which are all very consistent with each other. The combination of the results from the three methods gives M_200_=(5.1+/-1.3)x10^14^M_{sun}_, which is fully consistent with the individual measurements. The final NFW concentration c_200_ from the combined fit is c_200_=5.4^+1.4^_-1.1_. We have compared our measurements of M_200_ and c_200_ with predictions for (1) clusters from {Lambda}CDM simulations, (2) lensing-selected clusters from simulations, and (3) a real sample of cluster lenses.
223. Blank-field SCUBA surveys
ID:
ivo://CDS.VizieR/J/MNRAS/370/1057
Title:
Blank-field SCUBA surveys
Short Name:
J/MNRAS/370/1057
Date:
21 Oct 2021
Publisher:
CDS
Description:
Since the advent of Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT), a series of complementary surveys has resolved the bulk of the far-infrared extragalactic background into discrete sources. This has revealed a population of heavily dust-obscured sources at high redshift (z>1) undergoing an intense period of massive star-forming activity with inferred star formation rates of several hundred to several thousand solar masses per year. Taken together, these existing surveys cover a total area of 460arcmin^2^ to a range of depths, but combining the results has hitherto been complicated by the fact that different survey groups have used different methods of data reduction and source extraction. In this paper, we re-reduce and re-analyse all of the blank-field surveys to date in an almost identical manner to that employed in the 'SCUBA 8-mJy Survey'. Comparative source catalogues are given which include a number of new significant source detections as well as failing to confirm some of those objects previously published. These new source catalogues have been combined to produce the most accurate number counts to date from 2 to 12.5mJy.
224. BLAST observations of the SEP field
ID:
ivo://CDS.VizieR/J/ApJS/191/222
Title:
BLAST observations of the SEP field
Short Name:
J/ApJS/191/222
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present results from a survey carried out by the Balloon-borne Large Aperture Submillimeter Telescope (BLAST) on a 9deg^2^ field near the South Ecliptic Pole at 250, 350, and 500um. The median 1{sigma} depths of the maps are 36.0, 26.4, and 18.4mJy, respectively. We apply a statistical method to estimate submillimeter galaxy number counts and find that they are in agreement with other measurements made with the same instrument and with the more recent results from Herschel/SPIRE. Thanks to the large field observed, the new measurements give additional constraints on the bright end of the counts. We identify 132, 89, and 61 sources with S/N>=4 at 250, 350, 500um, respectively and provide a multi-wavelength combined catalog of 232 sources with a significance >=4{sigma} in at least one BLAST band.
225. BLAST survey in Vela-D
ID:
ivo://CDS.VizieR/J/ApJ/707/1836
Title:
BLAST survey in Vela-D
Short Name:
J/ApJ/707/1836
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Balloon-borne Large-Aperture Submillimeter Telescope (BLAST) carried out a 250, 350, and 500um survey of the Galactic plane encompassing the Vela Molecular Ridge, with the primary goal of identifying the coldest dense cores possibly associated with the earliest stages of star formation. Here, we present the results from observations of the Vela-D region, covering about 4deg^2^, in which we find 141 BLAST cores. We exploit existing data taken with the Spitzer MIPS, IRAC, and SEST-SIMBA instruments to constrain their (single-temperature) spectral energy distributions, assuming a dust emissivity index {beta}=2.0. This combination of data allows us to determine the temperature, luminosity, and mass of each BLAST core, and also enables us to separate starless from protostellar sources. We also analyze the effects that the uncertainties on the derived physical parameters of the individual sources have on the overall physical properties of starless and protostellar cores, and we find that there appear to be a smooth transition from the pre- to the protostellar phase. In particular, for protostellar cores we find a correlation between the MIPS24 flux, associated with the central protostar, and the temperature of the dust envelope. We also find that the core mass function of the Vela-D cores has a slope consistent with other similar (sub)millimeter surveys.
226. BLAST: the redshift survey
ID:
ivo://CDS.VizieR/J/ApJ/707/1779
Title:
BLAST: the redshift survey
Short Name:
J/ApJ/707/1779
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) has recently surveyed ~8.7deg^2^ centered on Great Observatories Origins Deep Survey-South at 250, 350, and 500um. In Dye et al. (2009, Cat. J/ApJ/703/285), we presented the catalog of sources detected at 5{sigma} in at least one band in this field and the probable counterparts to these sources in other wavebands. In this paper, we present the results of a redshift survey in which we succeeded in measuring redshifts for 82 of these counterparts. The spectra show that the BLAST counterparts are mostly star-forming galaxies but not extreme ones when compared to those found in the Sloan Digital Sky Survey. Roughly one quarter of the BLAST counterparts contain an active nucleus. We have also investigated the cases where there are two possible counterparts to the BLAST source, finding that in at least half of these there is evidence that the two galaxies are physically associated, either because they are interacting or because they are in the same large-scale structure. Finally, we have made the first direct measurements of the luminosity function in the three BLAST bands.
227. BLAST Vela sources
ID:
ivo://CDS.VizieR/J/ApJ/707/1824
Title:
BLAST Vela sources
Short Name:
J/ApJ/707/1824
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present first results from an unbiased 50deg^2^ submillimeter Galactic survey at 250, 350, and 500um from the 2006 flight of the Balloon-borne Large Aperture Submillimeter Telescope. The map has resolution ranging from 36" to 60" in the three submillimeter bands spanning the thermal emission peak of cold starless cores. We determine the temperature, luminosity, and mass of more than 1000 compact sources in a range of evolutionary stages and an unbiased statistical characterization of the population. From comparison with C^18^O data, we find the dust opacity per gas mass, {kappa}r=0.16cm^2^/g at 250um, for cold clumps. We find that 2% of the mass of the molecular gas over this diverse region is in cores colder than 14K, and that the mass function for these cold cores is consistent with a power law with index {alpha}=-3.22+/-0.14 over the mass range 14M_{sun}_<M<80M_{sun}_.
228. Blazar candidates behind the Magellanic Clouds
ID:
ivo://CDS.VizieR/J/ApJ/867/131
Title:
Blazar candidates behind the Magellanic Clouds
Short Name:
J/ApJ/867/131
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the identification of blazar candidates behind the Magellanic Clouds. The objects were selected from the Magellanic Quasars Survey (MQS), which targeted the entire Large Magellanic Cloud (LMC) and 70% of the Small Magellanic Cloud (SMC). Among the 758 MQS quasars and 898 of the unidentified (featureless spectra) objects, we identified a sample of 44 blazar candidates, including 27 flat-spectrum radio quasars and 17 BL Lacertae objects, respectively. All the blazar candidates from our sample were identified with respect to their radio, optical, and midinfrared properties. The newly selected blazar candidates possess the long-term, multicolor photometric data from the Optical Gravitational Lensing Experiment, multicolor midinfrared observations, and archival radio data for one frequency at least. In addition, for nine of them, the radio polarization data are available. With such data, these objects can be used to study the physics behind the blazar variability detected in the optical and midinfrared bands, as a tool to investigate magnetic field geometry of the LMC and SMC, and as an exemplary sample of point-like sources most likely detectable in the {gamma}-ray range with the newly emerging Cherenkov Telescope Array.
229. Blue early-type galaxies in Galaxy Zoo
ID:
ivo://CDS.VizieR/J/MNRAS/396/818
Title:
Blue early-type galaxies in Galaxy Zoo
Short Name:
J/MNRAS/396/818
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of a population of nearby, blue early-type galaxies with high star formation rates (0.5<SFR<50M_{sun}_/yr). They are identified by their visual morphology as provided by Galaxy Zoo for Sloan Digital Sky Survey Data Release 6 and their u-r colour. We select a volume-limited sample in the redshift range 0.02<z<0.05, corresponding to luminosities of approximately L* and above and with u-r colours significantly bluer than the red sequence. We confirm the early-type morphology of the objects in this sample and investigate their environmental dependence and star formation properties.
230. Blue stellar objects in strip DE=47{deg}
ID:
ivo://CDS.VizieR/J/other/Ap/52.369
Title:
Blue stellar objects in strip DE=47{deg}
Short Name:
J/other/Ap/52.36
Date:
21 Oct 2021
Publisher:
CDS
Description:
This is a list of 111 blue stellar objects and individual active galaxies with excess ultraviolet continuum lying within 08h-17h in {alpha} and +45{deg} +49{deg} in {delta} (1950.0). The surveyed objects are classified in terms of activity type.

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