adsabs/AstroCLIMB huggingface dataset:
Paper: LAMA: LAMOST Medium-Resolution Spectral Analysis Pipeline
Authors: Chun-qian Li, Jian-rong Shi, Hong-liang Yan, Zhong-rui Bai, Jiang-tao Wang, Ming-yi Ding
Figure caption: Same as Figure B1, but for GALAH.
Paper: LAMA: LAMOST Medium-Resolution Spectral Analysis Pipeline
Authors: Chun-qian Li, Jian-rong Shi, Hong-liang Yan, Zhong-rui Bai, Jiang-tao Wang, Ming-yi Ding
Figure caption: Same as Figure B1, but for PASTEL.
Paper: LAMA: LAMOST Medium-Resolution Spectral Analysis Pipeline
Authors: Chun-qian Li, Jian-rong Shi, Hong-liang Yan, Zhong-rui Bai, Jiang-tao Wang, Ming-yi Ding
Figure caption: Same as Figure B1, but for the calibrated LAMA stellar parameters.
Paper: LAMA: LAMOST Medium-Resolution Spectral Analysis Pipeline
Authors: Chun-qian Li, Jian-rong Shi, Hong-liang Yan, Zhong-rui Bai, Jiang-tao Wang, Ming-yi Ding
Figure caption: Same as Figure B2, but for the calibrated LAMA stellar parameters.
Paper: LAMA: LAMOST Medium-Resolution Spectral Analysis Pipeline
Authors: Chun-qian Li, Jian-rong Shi, Hong-liang Yan, Zhong-rui Bai, Jiang-tao Wang, Ming-yi Ding
Figure caption: Same as Figure B3, but for the calibrated LAMA stellar parameters.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Separation in arcseconds between the NWAY-identified CatWISE20 counterpart and the spectroscopic target vs. the best CatWISE20 match probability, color coded by spectral classifications: BL (blue circle), NL (green circle), galaxy (Gxy; peach “×”), Galactic sources (gray circle), AGN-Gxy pairs (peach star), dual AGN (purple star), and a BL Lac candidate (white, black-edged “×”). Solid symbols indicate NSS80 sources with lower-energy (i.e., soft) X-ray counterparts and white filled symbols mark NSS80 sources which lack lower-energy X-ray counterparts and, therefore, have a lower match probability given the large uncertainty in the  NuSTAR   position (i.e., ∼25″). The vertical black dashed–dotted line indicates the probability cut we applied in Section 3.2 to obtain reliable counterpart associations to the X-ray source.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Zoom ins (3300–5300 Å) of the prominent AGN spectral lines in Figure 31 of the spectroscopically confirmed NL AGN, Nu-cQSO, and Nu-rQSO subdivided into low (light green, light blue, and peach, respectively) and high (dark green, dark blue, and red, respectively) luminosity bins. The composite X-Shooter spectra of luminosity–redshift matched SDSS rQSOs and cQSOs (Fawcett et al. 2022) are plotted in red and blue dotted lines, and composite spectra of SDSS Type 2 QSOs (Yuan et al. 2016) as a purple dotted line for comparison.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Optical spectra for the first four unclassified post-NSS40 sources which lacks a redshift measurement; in some cases a red faint continuum is detected. The symbol key is described in Appendix E.1.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: 30″ × 30″ finding charts for the first 12 NSS80 sources with redshift measurements from the literature. For sources with decl. > –30° Pan-STARRS i-band imaging is used, and for sources with decl. < –30° Astro Data Lab (Fitzpatrick et al. 2014; Nikutta et al. 2020) i-band imaging is retrieved. The symbol key is described in Appendix E.1. Optical classifications for sources with photometric redshifts are appended with a “C” (i.e., GxyC = galaxy candidate; BLC = BL candidate). Also identified is a galaxy cluster (GClstr) at z = 0.445.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: 30″ × 30″ finding charts for the first 12 optically followed-up NSS40 sources reported in L17. For sources with decl. > –30° Pan-STARRS i-band imaging is used, and for sources with decl. < –30° Astro Data Lab i-band imaging is retrieved. The symbol key is described in Appendix E.1.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Optical spectra for the first four extragalactic post-NSS40 sources classified as BL AGNs in order of  NuSTAR   ID. The symbol key is described in Appendix E.1.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Optical spectra for the first four extragalactic post-NSS40 sources classified as galaxies (i.e., absorption spectral features). The symbol key is described in Appendix E.1.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Optical spectra for the first four extragalactic post-NSS40 sources classified as NL AGNs. The symbol key is described in Appendix E.1.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Optical spectra for the first four Galactic post-NSS40 sources (z = 0). The symbol key is described in Appendix E.1.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: A pie chart of the NSS80 source classifications obtained via our spectroscopic follow-up campaign. In total, there are 612 source entries in the NSS80 spectroscopic catalog: 594 unique spectroscopic entries and 18 additional entries. Of the 594 unique entries, we have classified 492 as extragalactic sources, including 284 BL (or BL?), 194 NL (or NL?), one galaxy cluster, 10 galaxies, and three unclassified sources with redshift measurements from the literature. We have also classified 58 Galactic sources at z = 0. There are a further 43 sources that lack a reliable redshift measurement, 28 of which are unclassified due to the lack of spectral lines, but a power-law continuum is detected in all of the cases, 14 sources have counterpart uncertainties due to the lack of a lower-energy X-ray counterpart or high optical source density, and one source is a Fermi BL Lac candidate. The remaining one source is a hotspot of 4C 74.26 (radio quasar), which was targeted as the primary NuSTAR science target; see Figure 17. In addition to the unique entries, we obtained spectra for a further 18 sources: three AGN pairs, of which one pair is a dual AGN system, two AGN–galaxy pairs, one galaxy pair, one unclassified pair (see Figure 18), seven sources with photometric redshifts, and four sources which are potentially the correct counterpart opposed to the one selected; three out of four are fainter lower-energy X-ray sources (two BLs + one phot-z source of unknown type) nominally closer to the  NuSTAR   source than the selected (X-ray brighter) BL counterpart, and the remaining source is an optically bright NL galaxy at a different redshift than the NWAY-selected NL counterpart (which is associated with the primary NuSTAR science target).
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Optical spectra for the three NSS80 AGN pairs: (a) a dual AGN system of merging, obscured AGNs, (b) a BL AGN (i.e., quasar) pair, and (c) a BL AGN + NL AGN pair. For each source pair the two spectra are plotted in the left panel and a 30″ × 30″ Pan-STARRS (or DECam for sources with decl. < −25°) i-band image centered on the  NuSTAR   position is shown on the right. Spectrum panel: shown on the top are the unique  NuSTAR   ID and source name, in the upper-left corner the observing telescope and run identification number (corresponding to Table 6), and in the upper-right corner the source classification and redshift. Sky subtraction has been performed, but some features may remain, e.g., the 7600 Å absorption feature. Image panel: all WISE detections are shown with “×” marks, color coded in W1 − W2 colors: non-AGN-like sources with W1 − W2 < 0.8 (green), AGN-like sources with W1 − W2 > 0.8 (red), and non-AGN-like sources based on the W1 − W2 color, but with a bright W3 detection (peach). The  NuSTAR   25″ and 30″ error circles are plotted in a dashed–dotted and a solid black line, respectively. The lower-energy X-ray position is marked with a blue cross and the respective error circle, the CatWISE20 position is indicated with a green crosshair, a WISE color-coded star and a green 2.″7 error circle, the PS1-DR2 position is shown with a purple 2″ error circle, and the spectroscopically observed pair of sources are marked with a red and a peach crosshair corresponding to the spectrum (black and peach).
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Top panel: r-band magnitude distributions for the high-probability NSS80 sources (i.e., adopted optical counterparts satisfying our NWAY probability cut) with constrained r magnitudes (721/953; light purple), overlaid with the constrained r-band magnitude distribution of the spectroscopically classified extragalactic (399/492) and Galactic (24/58) NSS80 sources with reliable counterpart associations shown in filled purple and white, purple-edged histograms, respectively. The 19 sources with evidence for being associated with the NuSTAR science targets for their respective observations are excluded. Bottom panel: the r-band magnitude distribution separated by spectroscopic classification: BL objects are shown in blue, NL objects are shown in green, and “Other” (including four galaxies and two unclassified sources) are shown in peach. The vertical lines mark the median r magnitude for the respective subsamples. Overall, the current spectroscopic completeness for the primary NSS80 catalog is 43% (550/1274), missing the faintest sources; this improves to 52% (508/981) for sources at high Galactic latitudes, ∣b∣ > 10°.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Multiwavelength imaging of the luminous X-ray hotspot in 4C 74.26 (e.g., Erlund et al. 2010), the primary NuSTAR science target. The hotspot, which coincides with a radio-bright lobe of 4C 74.26, is detected with both lower-energy (i.e., Chandra, XMM-Newton, and Swift-XRT) and hard X-ray observatories such as NuSTAR.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Distributions of the MIR and optical magnitudes and colors for the high-probability NWAY-selected counterpart samples at high Galactic latitudes (∣b∣ > 20°; green) and low Galactic latitudes (∣b∣ < 20°; peach). The median of each distribution is plotted with a dashed–dotted line. The dashed black lines indicate the distributions constructed in NWAY Round #1 and used as priors in Round #2. Top four panels: magnitude distributions for the four photometric WISE bands, for the sources with successful CatWISE20 matches satisfying the high-probability cut. Middle three panels: the g-band, r-band, and i-band magnitudes (corrected for Galactic extinction) for all the sources satisfying the NWAY high-probability cuts. Bottom two panels: the W1 − W2 and g − i colors for all the sources satisfying the NWAY high-probability cuts. These colors are used as priors for NWAY. The dashed–dotted gray line indicates the Stern et al. (2012) AGN threshold of W1 − W2 > 0.8. WISE magnitudes are Vega and optical magnitudes are AB.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Astrometric offsets between the lower-energy X-ray counterpart coordinates and the WISE (top row) and the adopted optical (bottom row) coordinates, color coded using the  NuSTAR   detection likelihood (﹩{p}_{\mathrm{false},\min }﹩), for NWAY-identified counterparts flagged as reliable. The high-Galactic-latitude lower-energy X-ray counterparts are from CSC2 (left column; circles), 4XMM-DR10/s (middle-left column; squares and diamonds, respectively), 2SXPS (middle-right column; stars), and  NuSTAR   only (right column; plus symbols). Low-Galactic-latitude sources are plotted with color-coded crosses and sources with less reliable counterpart associations are indicated with open gray-edged crosses. The dashed (dotted) circles correspond to the 1σ (2σ) search radii for each lower-energy X-ray telescope: 1.″2 (2.″5), 2.″4 (5″), 3.″4 (6″), and 12″ (24″) for Chandra, XMM-Newton, Swift-XRT, and NuSTAR, respectively. The white circle, square, diamond, star, and plus indicates the median astrometric offset for each of the extragalactic samples. Note the different scale for the NuSTAR-only section.
Paper: The NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population
Authors: Claire L. Greenwell, Lizelke Klindt, George B. Lansbury, David J. Rosario, David M. Alexander, James Aird, Daniel Stern, Karl Forster, Michael J. Koss, Franz E. Bauer, Claudio Ricci, John Tomsick, William N. Brandt, Thomas Connor, Peter G. Boorman, Adlyka Annuar, David R. Ballantyne, Chien-Ting Chen, Francesca Civano, Andrea Comastri, Victoria A. Fawcett, Francesca M. Fornasini, Poshak Gandhi, Fiona Harrison, Marianne Heida, Ryan Hickox, Elias S. Kammoun, Lauranne Lanz, Stefano Marchesi, Gaël Noirot, Encarni Romero-Colmenero, Ezequiel Treister, C. Megan Urry, Petri Väisänen, Brian van Soelen
Figure caption: Optical spectra for the NSS80 sources with two counterpart candidates. Three of the four candidates ((a)–(c)) are fainter lower-energy X-ray sources nominally closer to the  NuSTAR   source than the selected (X-ray brighter) BL counterpart. The correct counterpart for the remaining source (d) is either an optically bright NL AGN (z = 0.036) associated with the BAT-detected primary NuSTAR science target or an NL galaxy (z = 0.137) which lacks a lower-energy X-ray counterpart. See Figure 18 for the symbol key.