NGC 2787
NGC 2787 | |
---|---|
NGC 2787 as observed by the Hubble Space Telescope (HST). | |
Observation data (J2000 epoch) | |
Constellation | Ursa Major |
Right ascension | 09h 19m 18.60430s[1] |
Declination | +69° 12′ 11.6429″[1] |
Heliocentric radial velocity | 627.3±13.2 km/s[2] |
Distance | 24.17 ± 0.46 Mly (7.41 ± 0.14 Mpc)[3] |
Apparent magnitude (V) | 11.79[4] |
Apparent magnitude (B) | 12.92[4] |
Absolute magnitude (B) | −18.84[5] |
Characteristics | |
Type | SB(r)0+[6] |
Mass/Light ratio | 50[5] M☉/L☉ |
Size | 5.5 kpc[5] |
Apparent size (V) | 2′.530 × 1′.518[7] (NIR) |
Notable features | Barred lenticular; LINER |
Other designations | |
PGC 26341, UGC 4914[8] |
NGC 2787 is a barred lenticular galaxy approximately 24[3] million light-years away in the northern constellation of Ursa Major. It was discovered on December 3, 1788 by German-born astronomer William Herschel. J. L. E. Dreyer described it as, "bright, pretty large, a little extended 90°, much brighter middle, mottled but not resolved, very small (faint) star involved to the southeast".[9] The visible galaxy has an angular size of 2.5 × 1.5 arcminutes[7] or 3.24 × 1.81 arcminutes[10] and an apparent visual magnitude of 11.8.[4]
This galaxy is small and isolated[5] with a morphological classification of SB(r)0+,[6] which indicates a barred spiral (SB) with a ring around the bar (r). Being a lenticular galaxy, it has the large halo of an elliptical galaxy. The disk is inclined at an angle of 58°±3° to the line of sight from the Earth, with the major axis aligned along a position angle of 110°±3°.[5] The galaxy has an unusually high mass-to-light ratio, much greater than for a typical spiral galaxy.[5] The distribution of the galaxy's neutral hydrogen forms a clumpy ring with a radius of 10.3 kpc, double that of the visible galaxy, with a mass of 5.5×108 M☉.[5] This ring appears misaligned with the central disk.[11]
NGC 2787 contains a low-ionization nuclear emission-line region (LINER) at its core, which is a type of region that is characterized by its spectral line emission from weakly ionized atoms.[12] LINERs are very common within lenticular galaxies, with approximately one-fifth of nearby lenticular galaxies containing LINERs.[13] The supermassive black hole at the center has a mass of 4.1+0.4
−0.5×107 M☉.[14] The central region of the galaxy contains dust rings that are tilted with respect to the disk, which may be the result of an encounter with another galaxy.[11]
References
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ van den Bosch, Remco C. E.; et al. (May 2015). "Hunting for Supermassive Black Holes in Nearby Galaxies With the Hobby-Eberly Telescope". The Astrophysical Journal Supplement Series. 218 (1): 13. arXiv:1502.00632. Bibcode:2015ApJS..218...10V. doi:10.1088/0067-0049/218/1/10. S2CID 117876537. 10.
- ^ a b Tully, R. Brent; et al. (October 2013). "Cosmicflows-2: The Data". The Astronomical Journal. 146 (4): 25. arXiv:1307.7213. Bibcode:2013AJ....146...86T. doi:10.1088/0004-6256/146/4/86. S2CID 118494842. 86.
- ^ a b c Véron-Cetty, M.-P.; Véron, P. (2010). "A catalogue of quasars and active nuclei". Astronomy & Astrophysics. 13th. 518. Bibcode:2010A&A...518A..10V. doi:10.1051/0004-6361/201014188. A10.
- ^ a b c d e f g Shostak, G. S. (March 1987). "The distribution of HI in the lenticular galaxy NGC 2787". Astronomy and Astrophysics. 175: 4–8. Bibcode:1987A&A...175....4S.
- ^ a b Erwin, Peter; Debattista, Victor P. (June 2013). "Peanuts at an angle: detecting and measuring the three-dimensional structure of bars in moderately inclined galaxies". Monthly Notices of the Royal Astronomical Society. 431 (4): 3060–3086. arXiv:1301.0638. Bibcode:2013MNRAS.431.3060E. doi:10.1093/mnras/stt385. S2CID 54653263.
- ^ a b Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
- ^ "NASA/IPAC Extragalactic Database". Results for NGC 2787. Retrieved 2006-12-13.
- ^ Seligman, Courtney. "NGC Objects: NGC 2750 - 2799". Celestial Atlas. Retrieved 2020-09-09.
- ^ "NGC 2787 - Lenticular Galaxy in Ursa Major". The Sky Live. TheSkyLive.com. Retrieved 25 July 2023.
- ^ a b Erwin, Peter; et al. (November 2003). "When Is a Bulge Not a Bulge? Inner Disks Masquerading as Bulges in NGC 2787 and NGC 3945". The Astrophysical Journal. 597 (2): 929–947. arXiv:astro-ph/0310791. Bibcode:2003ApJ...597..929E. doi:10.1086/378189. S2CID 16032205.
- ^ Ho, L. C.; et al. (1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. 112 (2): 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. doi:10.1086/313041. S2CID 17086638.
- ^ Ho, L. C.; et al. (1997). "A Search for "Dwarf" Seyfert Nuclei. V. Demographics of Nuclear Activity in Nearby Galaxies". Astrophysical Journal. 487 (2): 568–578. arXiv:astro-ph/9704108. Bibcode:1997ApJ...487..568H. doi:10.1086/304638. S2CID 16742031.
- ^ Graham, Alister W. (November 2008). "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values". Publications of the Astronomical Society of Australia. 25 (4): 167–175. arXiv:0807.2549. Bibcode:2008PASA...25..167G. doi:10.1071/AS08013. S2CID 89905.
External links
- Media related to NGC 2787 at Wikimedia Commons
- A Galaxy That's All Wound Up
- NGC 2787 at ESA/Hubble
- v
- t
- e
- 2500
- 2501
- 2502
- 2503
- 2504
- 2505
- 2506
- 2507
- 2508
- 2509
- 2510
- 2511
- 2512
- 2513
- 2514
- 2515
- 2516
- 2517
- 2518
- 2519
- 2520
- 2521
- 2522
- 2523
- 2524
- 2525
- 2526
- 2527
- 2528
- 2529
- 2530
- 2531
- 2532
- 2533
- 2534
- 2535
- 2536
- 2537
- 2538
- 2539
- 2540
- 2541
- 2542
- 2543
- 2544
- 2545
- 2546
- 2547
- 2548
- 2549
- 2550
- 2551
- 2552
- 2553
- 2554
- 2555
- 2556
- 2557
- 2558
- 2559
- 2560
- 2561
- 2562
- 2563
- 2564
- 2565
- 2566
- 2567
- 2568
- 2569
- 2570
- 2571
- 2572
- 2573
- 2574
- 2575
- 2576
- 2577
- 2578
- 2579
- 2580
- 2581
- 2582
- 2583
- 2584
- 2585
- 2586
- 2587
- 2588
- 2589
- 2590
- 2591
- 2592
- 2593
- 2594
- 2595
- 2596
- 2597
- 2598
- 2599
- 2600
- 2601
- 2602
- 2603
- 2604
- 2605
- 2606
- 2607
- 2608
- 2609
- 2610
- 2611
- 2612
- 2613
- 2614
- 2615
- 2616
- 2617
- 2618
- 2619
- 2620
- 2621
- 2622
- 2623
- 2624
- 2625
- 2626
- 2627
- 2628
- 2629
- 2630
- 2631
- 2632
- 2633
- 2634
- 2635
- 2636
- 2637
- 2638
- 2639
- 2640
- 2641
- 2642
- 2643
- 2644
- 2645
- 2646
- 2647
- 2648
- 2649
- 2650
- 2651
- 2652
- 2653
- 2654
- 2655
- 2656
- 2657
- 2658
- 2659
- 2660
- 2661
- 2662
- 2663
- 2664
- 2665
- 2666
- 2667
- 2668
- 2669
- 2670
- 2671
- 2672
- 2673
- 2674
- 2675
- 2676
- 2677
- 2678
- 2679
- 2680
- 2681
- 2682
- 2683
- 2684
- 2685
- 2686
- 2687
- 2688
- 2689
- 2690
- 2691
- 2692
- 2693
- 2694
- 2695
- 2696
- 2697
- 2698
- 2699
- 2700
- 2701
- 2702
- 2703
- 2704
- 2705
- 2706
- 2707
- 2708
- 2709
- 2710
- 2711
- 2712
- 2713
- 2714
- 2715
- 2716
- 2717
- 2718
- 2719
- 2720
- 2721
- 2722
- 2723
- 2724
- 2725
- 2726
- 2727
- 2728
- 2729
- 2730
- 2731
- 2732
- 2733
- 2734
- 2735
- 2736
- 2737
- 2738
- 2739
- 2740
- 2741
- 2742
- 2743
- 2744
- 2745
- 2746
- 2747
- 2748
- 2749
- 2750
- 2751
- 2752
- 2753
- 2754
- 2755
- 2756
- 2757
- 2758
- 2759
- 2760
- 2761
- 2762
- 2763
- 2764
- 2765
- 2766
- 2767
- 2768
- 2769
- 2770
- 2771
- 2772
- 2773
- 2774
- 2775
- 2776
- 2777
- 2778
- 2779
- 2780
- 2781
- 2782
- 2783
- 2784
- 2785
- 2786
- 2787
- 2788
- 2789
- 2790
- 2791
- 2792
- 2793
- 2794
- 2795
- 2796
- 2797
- 2798
- 2799
- 2800
- 2801
- 2802
- 2803
- 2804
- 2805
- 2806
- 2807
- 2808
- 2809
- 2810
- 2811
- 2812
- 2813
- 2814
- 2815
- 2816
- 2817
- 2818
- 2819
- 2820
- 2821
- 2822
- 2823
- 2824
- 2825
- 2826
- 2827
- 2828
- 2829
- 2830
- 2831
- 2832
- 2833
- 2834
- 2835
- 2836
- 2837
- 2838
- 2839
- 2840
- 2841
- 2842
- 2843
- 2844
- 2845
- 2846
- 2847
- 2848
- 2849
- 2850
- 2851
- 2852
- 2853
- 2854
- 2855
- 2856
- 2857
- 2858
- 2859
- 2860
- 2861
- 2862
- 2863
- 2864
- 2865
- 2866
- 2867
- 2868
- 2869
- 2870
- 2871
- 2872
- 2873
- 2874
- 2875
- 2876
- 2877
- 2878
- 2879
- 2880
- 2881
- 2882
- 2883
- 2884
- 2885
- 2886
- 2887
- 2888
- 2889
- 2890
- 2891
- 2892
- 2893
- 2894
- 2895
- 2896
- 2897
- 2898
- 2899
- 2900
- 2901
- 2902
- 2903
- 2904
- 2905
- 2906
- 2907
- 2908
- 2909
- 2910
- 2911
- 2912
- 2913
- 2914
- 2915
- 2916
- 2917
- 2918
- 2919
- 2920
- 2921
- 2922
- 2923
- 2924
- 2925
- 2926
- 2927
- 2928
- 2929
- 2930
- 2931
- 2932
- 2933
- 2934
- 2935
- 2936
- 2937
- 2938
- 2939
- 2940
- 2941
- 2942
- 2943
- 2944
- 2945
- 2946
- 2947
- 2948
- 2949
- 2950
- 2951
- 2952
- 2953
- 2954
- 2955
- 2956
- 2957
- 2958
- 2959
- 2960
- 2961
- 2962
- 2963
- 2964
- 2965
- 2966
- 2967
- 2968
- 2969
- 2970
- 2971
- 2972
- 2973
- 2974
- 2975
- 2976
- 2977
- 2978
- 2979
- 2980
- 2981
- 2982
- 2983
- 2984
- 2985
- 2986
- 2987
- 2988
- 2989
- 2990
- 2991
- 2992
- 2993
- 2994
- 2995
- 2996
- 2997
- 2998
- 2999